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    Wyświetlanie 1-68 z 68
    Tytuł:
    ZnO dla fotowoltaiki
    ZnO for Photovoltaics
    Autorzy:
    Godlewski, M.
    Łuka, G.
    Pietruszka, R.
    Wachnicki, Ł.
    Witkowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/159146.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    fotowoltaika
    tlenek cynku
    photovoltaics
    zinc oxide
    Opis:
    Mimo znaczącej redukcji kosztów paneli fotowoltaicznych (PV), cena energii wytwarzanej przez baterie słoneczne ciągle jest za wysoka. Możliwe są dwie strategie rozwiązania tej sytuacji – (a) podniesienie wydajności konwersji światła w komórkach fotowoltaicznych lub/i (b) obniżenie kosztów paneli PV poprzez zastosowanie tańszych materiałów lub technologii. W referacie omówione są prace mające na celu: (a) zastąpienie zbyt drogiego ITO warstwami ZnO o przewodnictwie metalicznym, (b) uproszczenie konstrukcji komórek PV oraz (c) znalezienie alternatywnych materiałów.
    Despite of a large reductions of costs energy produced by solar panels is still too expensive. There are two approaches to change this situation: by (a) increase of device output and/or (b) reduction of device costs by use of cheaper alternative materials. In this article we discuss the latter approach – (a) replacement of ITO by ZnO with metallic conductivity, (b) change of device architecture, and (c) use of alternative materials.
    Źródło:
    Prace Instytutu Elektrotechniki; 2014, 264; 5-13
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review on Multi-dimensional Zinc Oxide Nanostructures
    Autorzy:
    Acharyya, Sarani
    Acharyya, Swarnali
    Samanta, Pijus Kanti
    Powiązania:
    https://bibliotekanauki.pl/articles/1031833.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Band-gap
    Morphology
    Semiconductor
    Zinc Oxide
    Opis:
    Nanostructured materials are being widely investigated due to their versatile properties leading to promising applications in various areas starting from electronics to environment and medical science. Amongst the various investigated nanostructures, Zinc Oxide (ZnO) is very important because of its versatile properties like high and direct band gap, optical transparency, room temperature ferromagnetism, piezoelectric property and gas sensing property. This mini review article is focused on the morphological study of various ZnO nanostructures starting from hierarchical nanostructures to quantum dots.
    Źródło:
    World Scientific News; 2020, 147; 140-165
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution growth of ZnO sub-micro rods enhanced by electric field
    Autorzy:
    Pisarkiewicz, T.
    Kenig, T.
    Rydosz, A.
    Maziarz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/200101.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanowires
    electrodeposition
    dielectrophoretic effect
    zinc oxide
    Opis:
    Recently the one-dimensional ZnO nanostructures have attracted much attention in gas sensor applications owing to their increased role of the surface. The authors have obtained ZnO rods of sub-micron size using the solution growth method with the growth temperature below 100.C. Investigations indicate that the rods have a well-defined hexagonal morphology and a wurtzite structure. The best uniformity and alignment of the sub-micron crystals was however obtained when electrodeposition from aqueous solution was developed. Sizes of these rods depend on the growth parameters. Moreover electrodeposition leads to a faster growth rate of ZnO sub-micron rods (2 hrs) as compared to the growth from solution (8 hrs). After electrodeposition the rods can be easily reoriented in external electric fields by using substrates with electrodes of appropriate geometry and configuration (dielectrophoretic effect). This enables the preparation of samples which can be used in gas sensor technology.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 425-428
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacturing and characterization of gellan gum – zinc oxide composites as potential biomaterials for wound treatment
    Autorzy:
    Macyk, Alicja
    Kusibab, Anna
    Pamuła, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/27324040.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    gellan gum
    zinc oxide nanoparticles
    zinc oxide
    microparticles
    wound healing
    L929 fibroblasts
    cynk
    fibroblasty
    biomateriały
    Opis:
    This study aimed to produce gellan gum-based hydrogels with the addition of zinc oxide as a potential dressing material. Hydrogels with ZnO concentrations of 0.01%, 0.02% and 0.04% were prepared, micrometric and nanometric ZnO particles were used, and a CaCl2 crosslinker was added to one part of the samples. All samples (14 types) produced by the freeze drying method were characterized with high swelling properties (>2000%), what is important to ensure the absorption of exudates from wounds. Samples with ZnO particles cross-linked with CaCl2 lost less mass after incubation in aqueous media and were characterized by better dimensional stability than those without crosslinking. The pH of the extracts of the samples containing ZnO particles was more neutral (pH 7.0-7.6) than that of the control gellan gum samples (pH of 5.5-6.1). The zinc release from cross-linked samples was twice as high for those containing nanometric particles than for micrometric particles (1.94 ± 0.04 mg/l and 0.93 ± 0.02, respectively). Relatively large amounts of released zinc species in the case of samples containing ZnO nanoparticles are promising in the context of the antibacterial properties and treatment of infected wounds. A lower amount of zinc released from samples with ZnO microparticles could be sufficient to prevent the development of the infection. Furthermore, both materials show satisfactory cytocompatibility with L929 fibroblasts, as shown by Alamar blue and live/dead viability tests, making them prospective candidates for wound healing
    Źródło:
    Engineering of Biomaterials; 2023, 26, 168; 2--8
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature-dependence of cathodoluminescence of zinc oxide monolayers obtained by atomic layer deposition
    Autorzy:
    Witkowski, B S
    Wachnicki, L
    Nowakowski, P
    Suchocki, A
    Godlewski, M
    Powiązania:
    https://bibliotekanauki.pl/articles/173941.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc oxide
    cathodoluminescence
    profiling
    temperature-dependence
    localization
    Opis:
    We performed cathodoluminescence (CL) investigations of zinc oxide monolayers obtained by atomic layer deposition. Layers of different thickness were deposited on commercial GaN/sapphire templates. Scanning electron microscopy (SEM) system equipped with CL allows direct comparison of SEM images and CL maps, taken from exactly the same areas of samples. In addition to SEM and CL images, CL profiling was performed by collecting the CL spectra at different accelerating voltages. The CL profiling allows to distinguish the emissions from a surface and volume of samples. An inter-link between samples microstructure and emission properties is investigated. Shifts of emission bands, associated by us with the localization effects, are observed. CL investigations are supported by photoluminescence (PL) measurements, which are characterized by a higher spectral resolution. PL investigations allow determination of the origin of emission bands.
    Źródło:
    Optica Applicata; 2013, 43, 1; 187-194
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biogenic production of zinc oxide nanoparticles from aqueous extracts of Duranta erecta L.
    Autorzy:
    Ravindran, C. P.
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193011.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Bioreduction
    Characterization
    Duranta erecta
    Zinc oxide nanoparticles
    Opis:
    The present communication reports the biosynthesis of zinc oxide nanoparticles using aqueous extracts of leaves, stem, root, flowers and fruits of Duranta erecta L. This plant gains horticultural and medicinal importance due to its various biological activities. Zinc Nitrate Hexahydrate [Zn (NO3)2•6H2O] solution was used as a precursor to synthesize Zinc oxide nanoparticles. The various plant (leaves, stem, roots, flowers, fruits) extracts played as reducing agents. The leaf extract showed strong absorbance peak at 302 nm, stem and flower peaks were located at 299 nm, roots at 293 nm and fruit extract solution peak observed at 317 nm.
    Źródło:
    World Scientific News; 2016, 28; 18-28
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leaching of zinc from low grade oxide ore using organic acid
    Autorzy:
    Irannajad, M.
    Meshkini, M.
    Azadmehr, A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/110892.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    leaching
    zinc oxide ore
    citric acid
    smithsonite
    Opis:
    The leaching of low grade zinc oxide mining tailings by organic acid as a leaching agent was investigated. Zinc was extracted successfully from sample by citric acid leaching. The effects of solid-to- liquid ratio, acid concentration, reaction time, temperature and ore particle size on the leaching efficiency were studied. The results obtained showed that particle sizes and reaction time had not any significant effect on the leaching recovery of zinc from smithsonite in the sizes range of 40-350 μm. Under conditions: temperature of 80ºC, reaction time of 60 min, citric acid concentration of 0.5 mol/L, and solid to liquid ratio of 1:10, 82% of zinc could be recovered.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 2; 547-555
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of polysorbate 80 on the flotation of zinc oxide ores with amines
    Autorzy:
    Xie, Qiaoling
    Wang, Dandan
    Han, Zhichao
    Tao, Huchun
    Liu, Sitong
    Powiązania:
    https://bibliotekanauki.pl/articles/2146852.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    polysorbate 80
    pretreated amines
    zinc oxide
    flotation
    Opis:
    In this study, the influence of polysorbate 80 on zinc oxide flotation was investigated with an amine collector. The results indicated that the pretreatment of amines with polysorbate 80 enhanced the Zn grade and recovery obtained using zinc oxide flotation. Desliming prior to flotation is not suggested based on the results of this study. The appropriate temperature for flotation was as low as 8 °C, and this flotation method also could be applied to different types of zinc oxide ores. Under optimum flotation conditions, a concentrate with a Zn grade of 48.34% and a Zn recovery of 95.97% was obtained.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 1; 149--158
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc oxide as a functional admixture to cement composites
    Autorzy:
    Klapiszewska, Izabela
    Ławniczak, Łukasz
    Parus, Anna
    Jesionowski, Teofil
    Klapiszewski, Łukasz
    Ślosarczyk, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/2146946.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc oxide
    admixtures
    cement composites
    antimicrobial tests
    Opis:
    There is an increasing trend in the modern construction industry to use nanomaterials, which allow to improve the performance of construction materials on the one hand, and to shape new properties on the other. This study presents the results of physicomechanical and antibacterial tests for cement composites modified with zinc nanooxide. The main aim of this study was to compare the structural and morphological properties of three selected commercial zinc nanooxides and to determine the influence of the above mentioned nanooxides on the physicomechanical properties of cement composites and the ability to inhibit the activity of gram-positive and gram-negative bacteria as well as fungi. It was shown that commercial nanooxides can significantly differ in terms of physicochemical properties, which depend on their production method. Two of them were characterized by high specific surface areas, which in turn translated into rheological properties of cement mortars. Nanooxides with higher specific surface areas tend to reduce the plasticity of the mortars. According to the literature data, all nanooxides caused a delay in cement binder setting by more than 100%. This resulted in a reduction of the early one-day flexural and compressive strength of the composite. In the later curing period, especially after 7 days of hardening, a significant acceleration of the hydration process was observed in composites with the addition of all nanooxides, which was confirmed by significant increases in mechanical parameters. Nevertheless, the tested nanooxides showed different sensitivity towards microorganisms, which was influenced by both the type of nanooxide and bacteria.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 145565
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of Copper, Iron, and Lead Content in Laboratory Wastewater Using Zinc Oxide Photocatalyst under Solar Irradiation
    Autorzy:
    Agustina, Tuty Emilia
    Habiburrahman, Muhammad
    Amalia, Farah
    Arita, Susila
    Faizal, Muhammad
    Novia
    Gayatri, Rianyza
    Powiązania:
    https://bibliotekanauki.pl/articles/2202163.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    AOPs
    photocatalysis
    heavy metals
    sunlight
    zinc oxide
    Opis:
    Heavy metal is a type of metal that has a high density and high toxicity when consumed by living things, especially humans. To prevent the impact of environmental pollution, optimal handling of wastewater containing heavy metals is required, including the wastewater from laboratories. This research aimed to study the effect of pH, catalyst dose, and irradiation time on the reduction of Copper (Cu), Iron (Fe), and Lead (Pb) heavy metals and their application to laboratory wastewater treatment. Among the Advanced Oxidation Processes (AOPs) methods, photocatalysis was chosen to reduce the level of Cu, Fe, and Pb heavy metals where zinc oxide (ZnO) is used as a photocatalyst and the sunlight as a light source. To determine the effect of pH, catalyst dose, and time on the reduction of heavy metal levels, firstly, this research used the synthetic wastewater containing Cu, Fe, or Pb heavy metals. On the basis of the experimental results, it is concluded that the pH value, catalyst dose, and time affect the photocatalytic process, decreasing the levels of Cu, Fe, and Pb metals. The optimum pH value obtained for Cu was at pH 7–8, for Fe it was at pH 6, and for Pb it was at pH 8; in turn, the metal removal percentages were 99.46, 99.91, and 99.70%, respectively. In the photocatalysis of synthetic wastewater, high removal percentage of more than 99% was achieved by using 0.1 g/L catalyst. The optimum decrease of metals occurred in the first 15 minutes of solar irradiation where the removal percentage was close to 100%. In this study, the application of ZnO photocatalyst under solar irradiation can reduce the heavy metals content in the laboratory wastewater by almost 100%, which meets the environmental quality standard for Cu, Fe, and Pb.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 10; 107--115
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composition and Optical Dispersion Characterization of Nanoparticles ZnO-NiO Thin Films: Effect of Annealing Temperature
    Autorzy:
    Oboudi, S.F.
    Habubi, N.F.
    Mohamed, G.H.
    Chiad, S.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/412573.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    TCOs
    Dispersion parameters
    Thermal evaporation
    zinc oxide
    Nickel Oxide
    Opis:
    Thin films of ZnO0.7NiO0.3 have deposited on glass substrates at room temperature by using thermal evaporation technique under vacuum 10-5 mbar. The optical properties and dispersion parameters of the films have been studied. Changes in direct optical energy band gap of films were confirmed before and after annealing. The optical energy gap Eg decreased from 3.11 to 2.86 eV with increasing of annealing temperature to 200 ºC. Some of the optical absorption parameters, such as optical dispersion energies Eo and Ed, Urbach tails EU , dielectric constant ε, the average values of oscillator strength So, and wavelength of single oscillator λo have been reported. An increase in the annealing temperature causes an increase in the average oscillator strength from 62.02 to 87.71 eV.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 8, 1; 78-86
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of different zinc compounds from a smithsonite ore through ammonia leaching and subsequent heat treatment
    Autorzy:
    Ehsani, Arman
    Ehsani, Ilhan
    Obut, Abdullah
    Powiązania:
    https://bibliotekanauki.pl/articles/1445772.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ammonia leaching
    smithsonite
    zinc ammine carbonate
    zinc carbonate hydroxide
    zinc oxide
    Opis:
    In this study, firstly, the effects of ammonia concentration, leaching time and solid/liquid ratio on the leaching behaviour of zinc from a smithsonite (ZnCO3) ore sample in aqueous ammonia solutions were investigated at room temperature by chemical, X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy analyses. It was found that leaching ratio of zinc steeply increased from 30.1 to 76.2% with increasing ammonia concentration from 1.0 to 4.0 M and maximum zinc leaching ratio of 79.7% was reached after leaching in 13.3 M NH3 solution. The XRD pattern of the residue obtained after leaching in 4.0 M NH3 solution for 90 min at solid/liquid ratio of 0.15 g/mL, the optimum condition, showed that smithsonite phase in the ore sample almost completely dissolved whereas the gangue minerals goethite and calcite remained unaffected, confirming the selectivity of ammonia solution for zinc dissolution. Together with zinc, leaching ratios of cadmium were also determined. In second part of the study, precipitation tests (by complete drying at different temperatures) were conducted on dissolved zinc, carbonate and ammonia containing pregnant solutions obtained after selected leaching experiments. By complete drying of the pregnant solutions at low temperatures, i.e. 50°C, relatively pure solid zinc ammine carbonate (Zn(NH3)CO3) precipitates and at higher temperatures, i.e. 150°C, quite pure solid zinc carbonate hydroxide (Zn5(CO3)2(OH)6) precipitates could be prepared. High-temperature heating of Zn(NH3)CO3 and Zn5(CO3)2(OH)6 precipitates at 450°C yielded single-phase zinc oxide (ZnO). The chemical compositions, FT-IR spectra and scanning electron microscope (SEM) photographs of some of the precipitates were also presented.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 96-106
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of zinc oxide nanoparticles on the expression of proinflammatory proteins in murine macrophages raw 264.7 cells
    Autorzy:
    OLBERT, Magdalena
    GRYC, Karolina
    SROCZYŃSKA, Katarzyna
    ZAJĄC, Anna
    LIPKOWSKA, Anna
    LIBROWSKI, Tadeusz
    GDULA-ARGASIŃSKA, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1033697.pdf
    Data publikacji:
    2017
    Wydawca:
    Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
    Tematy:
    COX-2
    Nrf2
    inflammation
    zinc oxide nanoparticles
    Opis:
    Zinc is a microelement essential for the body. It has a great impact on the proper development and renewal of tissues, reproductive system, skin condition, or immune processes. Zincis involved practically in all aspects of the immune system and the production and activation of white blood cells. This work aimed to determine the effect of zinc oxide nanoparticles (ZnONP) on the expression of pro-inflammatory proteins in murine macrophages RAW 264.7, activated with lipopolysaccharide (LPS). Using the immunodetection technique the expression of cyclooxygenase 2 (COX-2), prostaglandin E2 synthase (cPGES), prostaglandin F2α receptor (FP receptor) and nuclear factor Nrf2 was determined. Statistically the highest expression of COX-2, cPGES, and FP receptor was observed in LPS-activated macrophages. RAW 264.7 cells supplementation with ZnONP 100 nmol and 500 nmol and LPS activation resulted in repression of COX-2 and cPGES, and an increased expression of Nrf2 protein when compared to control. The results suggest an anti-inflammatory effect and activation of the antioxidant system by ZnONP in RAW 264.7 macrophages. It seems appropriate to conduct further research on the molecular mechanism of action of ZnONP in eukaryotic cells.
    Źródło:
    Medicina Internacia Revuo; 2017, 28, 109; 262-265
    0465-5435
    Pojawia się w:
    Medicina Internacia Revuo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biogenesis of Zinc Oxide Nanoparticles using Couroupita guianensis Aubl. Extracts - A Green Approach
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193027.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Couroupita guianensis
    Zinc oxide nanoparticles
    aqueous extracts
    characterization
    Opis:
    Zinc oxide nanoparticles (ZnO NPs) were synthesized by the green synthesis methods using aqueous extracts of Couroupita guianensis Aubl. This is an eco-friendly, time conservative and cost effective way of nanoparticle production. The aqueous extracts of leaves, stem, flower petals and bark were used to synthesize the nanoparticles. Zinc Nitrate hexahydrate (Zn (NO3)2•6H2O) was used as a precursor material. The prepared Zinc oxide nanoparticles were characterized using UV-Vis spectrophotometric analysis. The wavelength specific UV-Vis absorption peaks for Zinc oxide nanoparticles were recorded between 290 nm to 302 nm which confirmed the presence of Zinc oxide in nano scale. The reaction mixture with aqueous extract of leaf showed maximum absorbance spectral peak at 302 nm, stem at 294 nm, flower petals at 292 nm and bark at 288 nm. This is the first report to explore the use of Couroupita guianensis for the biogenic production of Zinc oxide nanoparticles to meet the demand of the pharmaceutical, medicinal and environmental industries.
    Źródło:
    World Scientific News; 2016, 29; 86-95
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc Oxide nanoparticles synthesis by use of aqueous extracts of Muntingia calabura L.
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1077767.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biosynthesis
    Muntingia calabura
    Zinc oxide nanoparticles
    optical properties
    Opis:
    Biological synthesis of metal nanoparticles gained worldwide interest due to their rapid, non-toxic, economical, single-step technique and eco-friendly alternative. Green-chemical approach of production of Zinc Oxide (ZnO) nanoparticles (NPs) has been exploited in the field of medicine, food packaging, nano-optical and electrical devices. Muntingia calabura is a multipotent medicinal plant with astounded biological activities and phytoconstituents. The nanoparticles obtained using aqueous extracts of various parts of M. calabura were characterized with UV-VIS spectroscopy to obtain information concerning the optical properties of synthesized ZnO nanoparticles. The proposed green and economical method could be used for large scale production of nanostructures because of its advantages over other physical and chemical methods.
    Źródło:
    World News of Natural Sciences; 2019, 22; 31-40
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemiczne i elektrochemiczne wytwarzanie warstw tlenku cynku
    Chemical and electrochemical preparation of zinc oxide coatings
    Autorzy:
    Wiliński, Z.
    Lipińska, L.
    Batijewski, R.
    Marcjaniuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/192160.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    tlenek cynku
    elektrokrystalizacja
    półprzewodnik
    zinc oxide
    electrocrystalization
    semiconductors
    Opis:
    W artykule przedstawiono wyniki badań przeprowadzonych w celu wytworzenia warstw tlenku cynku o różnych strukturach, z wodnych roztworów metodą chemicznego osadzania i elektrosyntezy. Do osadzania ZnO wykorzystano następujące podłoża: szkiełka mikroskopowe i płytki szklane pokryte warstwą ITO. Wykonane warstwy poddano badaniom: mikroskopii skaningowej SEM, dyfrakcji rentgenowskiej XRD oraz fotoluminescencji.
    Coatings of ZnO with chemical (SILAR) and electrochemical methods were prepared. As substrate microscope glass plates and glass plates ITO layer coated were used. Surface morphology (SEM), photoluminescence (PL) and crystal structure (XRD) were examined.
    Źródło:
    Materiały Elektroniczne; 2009, T. 37, nr 3, 3; 13-20
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structured Analysis of Nanostructured Zinc Oxide (ZnO) Thin Films Deposited by Sol-Gel
    Autorzy:
    Hussin, Rosniza
    Hanafi, F.
    Rashid, R. A.
    Harun, Z.
    Kamdi, Z.
    Ibrahim, S. A.
    Ainuddin, A. R.
    Rahman, W.
    Leman, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134100.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sol-gel
    zinc oxide
    ZnO
    thin films
    nanostructured
    Opis:
    In this work, zinc oxide (ZnO) thin films are deposited on glass substrate using the sol-gel spin coating technique. The effect of annealing temperature on structural properties was investigated. The ZnO sol-gel was produced from zinc acetate dehydrate as the starting material with iso-propanol alcohol as the stabilizer. The ratio was controlled, distilled water and diethanolamine as the solvent mixing on a magnetic stirrer for an hour under constant heat of 60°C. The ZnO thin film was deposited using the spin coating technique with the speed of 3000 rpm for 30 minutes before the sample undergoes pre-heat in the oven at the temperature of 100°C for 10 minutes. The sample was annealing in the furnace for an hour at 200°C, 350°C, and 500°C. The X-ray diffraction (XRD) analysis confirms that hexagonal wurtzite structure with zincite and zinc acetate hydroxide hydrate composition. The thin films surface roughness was analyzed using an atomic force microscope (AFM) and scanning electron microscope (SEM) for surface morphology observation.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1055--1060
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE INFLUENCE OF KETOPROFEN AND ZINC OXIDE NANOPARTICLES ON SERUM COPPER LEVEL IN RATS
    Autorzy:
    Olbert, Magdalena
    Krośniak, Mirosław
    Gdula-Argasińska, Joanna
    Librowski, Tadeusz
    Zygmunt, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/956850.pdf
    Data publikacji:
    2018
    Wydawca:
    Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
    Tematy:
    inflammation
    ketoprofen
    serum copper level
    zinc oxide nanoparticles
    zinc-copper antagonism
    Opis:
    The role of copper in anti-inflammatory response includes several mechanisms. Antagonism between zinc (Zn) and copper (Cu) and proper balance between the two elements in the organism may affect the course of inflammatory diseases. Copper is a component of Zn/Cu superoxide dismutase (Zn/Cu SOD) and other enzymes involved in the anti-inflammatory response of the organism. To investigate the serum copper level during inflammation and diseases, numerous researches were conducted. Copper deficiency or copper intoxication may lead to biological consequences. Copper deficiency may be caused by various factors, one of them is excessive zinc supplementation. The aim of the study was to investigate the alterations in the serum copper level after 2-week zinc oxide nanoparticles (NPs-ZnO) administration. The second aim was to investigate serum copper level alterations after 2-week NPs-ZnO and single ketoprofen administration. The inflammatory state was induced in each group by the carrageenan injection at the 15th day of the experiment. The results indicate for the decrease in serum copper level in group receiving NPs-ZnO compared to control. Moreover, in groups receiving NPs-ZnO as well as ketoprofen, a decrease in serum copper level was observed. We may conclude that NPs-ZnO administration and also ketoprofen administration acts as anti-inflammatory agents and may induce a decrease in serum copper level.
    Źródło:
    Medicina Internacia Revuo; 2018, 28, 110; 11-22
    0465-5435
    Pojawia się w:
    Medicina Internacia Revuo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heating on structure and leaching characteristics of a zinc carbonate ore
    Autorzy:
    Kumas, Cavit
    Obut, Abdullah
    Powiązania:
    https://bibliotekanauki.pl/articles/1446908.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcium zincate
    smithsonite
    sodium hydroxide leaching
    zinc carbonate ore
    zinc oxide
    Opis:
    In this work, the structural changes occurred in a zinc carbonate (smithsonite) ore sample following heating at temperatures between 523 K and 1173 K were investigated in detail using X-ray diffraction (XRD), thermal (TG/DTA) and Fourier-transform infrared (FT-IR) spectroscopy analyses. Afterwards, the leaching characteristics of zinc from the ore sample and the heated ore samples in sodium hydroxide solutions were determined. While heating at 523 K did not cause any structural change in the ore sample, heating at 723 K completely converted smithsonite $(ZnCO_3)$ in the ore sample to zinc oxide $(ZnO)$, which resulted lower zinc leaching efficiencies of 40.6% and 62.0% for 3 and 4 mol/dm3 NaOH concentrations, respectively, in comparison to zinc leaching efficiencies (67.2% and 70.7%) obtained for the unheated ore sample. On the other hand, due to neoformation of dissolution resistant $ZnFe_2O_4$, $Ca_2ZnSi2O_7$ and $Zn_2SiO_4$ phases during heating and formation of $CaZn_2(OH)_6∙2H_2O$ phase during leaching, the leaching efficiency of zinc further decreased to 22.2% and 31.3%, respectively, in 3 and 4 $mol$ / $dm^3$ NaOH solutions for the ore sample heated at 1173 K. The formation of zinc-containing dissolution resistant phases by high-temperature heating was observed to be the only reason for the reduction in the zinc leaching efficiency (49.4% at 1173 K) at the highest NaOH concentration (8 mol/dm3) studied. In this work, the comparative precipitation studies were also conducted and crystalline zinc oxides with different morphologies could be precipitated at considerably high efficiencies from the selected pregnant solutions obtained following leaching.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 5; 23-32
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Green synthesis of zinc oxide nanoparticles from aqueous extracts of Sesamum indicum L. and their characterization
    Autorzy:
    Manokari, M.
    Latha, R.
    Priyadharshini, S.
    Cokul, Raj M.
    Beniwal, Puneet
    Shekhawat, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1077277.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biosynthesis
    Characterization
    Plant Extracts
    Sesamum indicum
    Zinc Oxide Nanoparticles
    Opis:
    Green synthesis of Zinc oxide nanoparticles (ZnO-NPs) is a novel and non-toxic method as compared to the hazardous conventional physical and chemical methods. Herein, we report production of ZnO-NPs for the first time using whole vegetative parts of Sesamum indicum L. The aqueous extracts of various parts of S. indicum were used to synthesize nanoparticles in this study. The synthesized nanoparticles were evaluated using UV-visible spectroscopy for confirmation and characterization. The maximum UV-visible spectral absorption peaks were observed from 293 to 296 nm wavelengths. Leaf and stem reaction mixtures exhibited the sharpest absorption peaks of all the variations at 293 nm and root at 296 nm. This study leads to the development of cost-effective ZnO-NPs synthesis with possible further exploration to serve mankind.
    Źródło:
    World News of Natural Sciences; 2019, 23; 200-210
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesized and characterization of pure and Er+3 doped ZnO nanoparticles by using laser ablation in ethanol
    Autorzy:
    Ismail, Raid A.
    Habubi, Nadir F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1191374.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    AFM
    Er doping
    Heterojunction
    XRD
    Zinc Oxide
    nanocollidal suspension
    Opis:
    Pulsed laser ablation in ethanol at room temperature with laser fluence 4.62 J/cm2 was employed to synthesize pure zinc oxide (ZnO) and Er- doped ZnO nanocolloidal suspension. The structural properties were determined by using x-ray diffraction (XRD) method and was confirmed its hexagonal wurtzite structure. The photoluminescence spectra (PL), AFM and FTIR measurement of the synthesized pure and Er-doped ZnO is carried out. The photoluminescence spectra measurements show that all the samples have ultraviolet emission and green emission and the surface granular morphology. The FTIR spectra indicate the existence of Zn-O, Er-O-Er and Er-O stretching modes. Al/ZnO/P-Si/Al and Al/Er-ZnO/P-Si/Al photodetectors hetrojunction has two peaks of response located at 650 nm for and 790 nm and the first peak shifted to 550nm for the doped hetrojunction with max sensitivity 0.7A/W. The maximum specific detectivity is 4.3×1012 W-1•cm•Hz-1 and 3×1012 W-1 •cm•Hz-1 for undoped and doped hetrojunctions respectively. The values of the built-in potentials 0.9 volt for Al/ZnO/P-Si/Al heterojunction and 0.6 volt for Al/Er-ZnO/P-Si/Al hetrojunction.
    Źródło:
    World Scientific News; 2016, 33; 67-78
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Zinc oxide nanoparticles from Clitoria ternatea L. extracts: a green approach
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189980.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biogenesis
    Zinc oxide nanoparticles
    Clitoria ternatea
    UV-Visible characterization
    Opis:
    We report the development of green methods for synthesis of zinc oxide at nano scale. Biological systems are being explored for the synthesis of nanoparticles. The plant Clitoria ternatea contains alkaloids, tannins, glycosides, resins, steroids, saponins, flavonoids, phenols, kaempferol, clitorin, taraxerol, aparajitin, sistosterol, hexacosanal and anthoxanthin. The whole plant is traditionally used to treat leprosy, bronchitis, inflammation, leucoderma and tuberculosis. The present report describes the biosynthesis and characterization of zinc oxide nanoparticles using aqueous extracts of leaves, stem, root, flowers and fruits of Clitoria ternatea. The aqueous reaction mixture of leaf, flower petals and roots showed strong broad UV spectral peak at 296 nm, stem at 293 nm and roots at 311 nm.
    Źródło:
    World Scientific News; 2016, 52; 216-227
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified and unmodified zinc oxide as coagent in elastomer compounds
    Autorzy:
    Kołodziejczak-Radzimska, A.
    Jesionowski, T.
    Maciejewska, M.
    Zaborski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779145.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    zinc oxide
    maleic acid
    emulsion precipitation
    modification
    elastomers
    vulcanizates
    Opis:
    The aim of this work was to study the activity of unmodifi ed and modifi ed ZnO in the peroxide crosslinking of hydrogenated acrylonitrile-butadiene elastomer (HNBR) and ethylene-propylene copolymer (EPM). In the fi rst step, zinc oxide was obtained by emulsion precipitation. Maleic acid was introduced onto the surface of ZnO Rusing an in situ method. The unmodified and modified zinc oxide was characterized using dispersive and morphological analysis, BET surface area analysis, and elemental, spectroscopic and thermal analysis. In the second stage of the research, the ZnO/MA systems were incorporated into the structure of elastomer compounds improving the kinetic and mechanical properties of vulcanizates. The proposed modification method had a favorable effect on the physicochemical properties of the zinc oxide and on the kinetic and mechanical properties of the vulcanizates. This study demonstrated that modification of zinc oxide by maleic acid is a promising technique.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 3; 63-68
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alternatives to zinc oxide in pig production
    Autorzy:
    Pejsak, Z.
    Kaźmierczak, P.
    Butkiewicz, A.F.
    Wojciechowski, J.
    Woźniakowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/16648009.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    zinc oxide
    alternatives
    probiotics
    organic acids
    liquid feeding
    bacteriophages
    Opis:
    Zinc oxide (ZnO) has been applied for many years in the production of pigs to reduce the number of diarrhoea in weaned piglets. In June 2022, the European Union banned the use of zinc oxide (ZnO) in pig feed. According to scientific reports, the may reason was the accumulation of this microelement in the environment of pig production. It has been shown that frequent application of ZnO can lead to increased antibiotic resistance in pathogenic swine microflora. The main alternatives to ZnO are probiotics, prebiotics, organic acids, essential oils, and liquid feeding systems. Alternatives to ZnO can be successfully used in pig production to reduce the number of diarrhoea among piglets during the postweaning period. Additional reports indicated that bacteriophage supplementation has a positive effect on the health of pigs. The article provides an overview of current ZnO substitutes that can be used in pig farming.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 2; 319-330
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical approach to the production of cement composites doped with ZnO and ZnO-based materials
    Autorzy:
    Klapiszewska, Izabela
    Balicki, Sebastian
    Wilk, Kazimiera A.
    Klapiszewski, Łukasz
    Ślosarczyk, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/24085675.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cement composite
    zinc oxide
    hybrid materials
    design of experiments
    Opis:
    In this study, physical and functional properties of the cement composites containing ZnO, ZnO/lignin and lignin admixtures were investigated using Response Surface Methodology (RSM). The I-optimal design based on RSM was used to assess the influence of ZnO-based doping agent, of either commercial or synthetic origin, on cement composite production in the function of average compressive strength and cost. Polynomial mathematical models were developed by RSM confronting results from the experimental design. The accuracy and precision of the utilized models established by I-optimal design were tested using Analysis of Variance (ANOVA). The first stage of formulation optimization revealed that the use of commercially available ZnO-based admixture no. 4 (ZnO-SA, supplied by Sigma Aldrich) allowed to achieve the desired results, passing all the requirements, i.e., the best microbial purity combined with reasonable cost, followed by satisfactory physical properties. In the second stage of formulation optimization, the influence of implementing the hybrid materials, i.e., ZnO-SA mixed in different proportions with lignin was evaluated. RSM revealed that doping admixture no. 3, i.e., ZnO-SA/lignin (5:1), is the best candidate, which comprised augmented functional and physical properties of the fabricated cement composite. This component exhibited the best microbial purity as well as the lowest total pore volume, followed by satisfactory physical properties. Verification of the model findings indicated considerable agreement between the predicted and experimental values. From the findings, it was confirmed that a reasonable cost-performance balance for cement composites can be achieved using ZnO-SA and ZnO-SA/lignin (5:1).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 4; art. no. 168352
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecofriendly synthesis of Zinc oxide nanoparticles from asthma plant - Euphorbia hirta L.
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1182444.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Absorption spectrum
    Euphorbia hirta
    Reaction mixtures
    Zinc oxide nanoparticles
    Opis:
    The present study states about the biosynthesis and UV-Visible characterization of Zinc oxide (ZnO) nanoparticles using leaf, stem, roots and inflorescence of the medicinal herb Euphorbia hirta. The aqueous extracts of plant parts were acted as capping and reducing agent while Zinc Nitrate Hexahydrate used as precursor. One milliliter of plant extracts mediated the formation of ZnO nanoparticles in solution which were visually confirmed by the development of yellowish color in the reaction mixtures. The optical properties of the reaction mixtures were analyzed by the UV-Visible double beam spectrophotometer. The leaf reaction mixture showed strong absorption band at 302nm, stem reaction mixture at 299nm, and the root and inflorescence reaction mixtures at 310nm. The results indicate that whole Euphorbia hirta plant can be used for the biosynthesis of Zinc oxide nanoparticles.
    Źródło:
    World Scientific News; 2017, 69; 111-121
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of zinc oxide nanoparticles using aqueous extracts of a medicinal plant Micrococca mercurialis (L.) Benth.
    Autorzy:
    Manokari, M.
    Ravindran, C. P.
    Shekhawat, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192709.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Bioreduction
    Micrococca mercurialis
    UV-Visible spectrophotometer
    Zinc oxide nanoparticles
    Opis:
    The synthesis of Zinc oxide (ZnO) nanoparticles using plant parts is always an attractive and eco-friendly method. The present study focuses on the production of ZnO nanoparticles from Zinc Nitrate hexahydrate (Zn (NO3)2•6H2O) using the aqueous extracts of a medicinal plant Micrococca mercurialis. The plant is found to be rich in primary and secondary metabolites such as proteins, steroids and alkaloids, which are responsible and enhancing the biogenic synthesis of ZnO nanoparticles. Leaves, stems, roots and fruits of M. mercurialis were used to prepare the aqueous extracts. The characterization and confirmation of synthesized ZnO nanoparticles was performed by UV-Visible spectrophotometer. The reaction mixtures showed significant and sharp UV absorbance peaks at 305 nm, 299 nm, 311 nm and 302 nm corresponding to the aqueous extracts of leaf, stem, root and fruits reacted with zinc nitrate respectively. It has been proved that the medicinal plant M. mercurialis can be used to synthesize ZnO nanoparticles and the biological method of synthesis of ZnO nanoparticles are safe and good alternative to the chemical and physical methods.
    Źródło:
    World Scientific News; 2016, 30; 117-128
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Concentration of Arsenic Removal from Acid Leaching Solution of Zinc Oxide Dust by Water-Quenched Slag
    Autorzy:
    Sun, H. Y.
    Sen, W.
    Kong, X.
    Liu, G. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/356676.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arsenic removal
    water-quenched slag
    zinc oxide dust
    purification
    Opis:
    The present work provides a study on high concentration of arsenic removal from acid leaching solution of zinc oxide dust by water-quenched slag. The water-quenched slag is a waste slag produced from fuming furnace of lead pyrometallurgical process and used as a substitute of ferrous sulfate heptahydrate to precipitate arsenic at purification section. The effects of reaction temperature, reaction time, the addition of H2O2 and the addition of water-quenched slag on arsenic removal rate were systematically investigated. The reaction temperature of 70°C, reaction time of 1h, H2O2 addition of 10.8 mL/L and water-quenched slag addition of 17.8 g/L are identified as the best technical parameters. At the optimum conditions, the arsenic (III) with high concentration (As 4.13 g/L) is efficiently removed (arsenic removal rate > 99%). The filtrate (Fe 1.21 mg/L, As 1.53 mg/L) with low concentrations of arsenic and iron and the stable filter residue are also obtained successfully. The United States EPA Toxicity Characteristic Leaching Procedure (TCLP) test shows that the As leachability never exceeds the regulatory limit of 5 mg/L As. The results suggest that the water-quenched slag shows potential for removing high concentration of arsenic from acid leaching solution of zinc oxide dust.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 425-430
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudocapacitive Characteristics of Mg Doped ZnO Nanospheres Prepared by Coprecipitation
    Autorzy:
    Arul, S.
    Senthilnathan, T.
    Jeevanantham, V.
    Satheesh Kumar, K. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049144.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    Mg-doped ZnO
    coprecipitation
    cyclic voltammetry
    EiS
    Opis:
    A n-type semiconductor ZnO has high transmittance features, excellent chemical stability and electrical properties. It is also commonly used in a range of fields, such as gas sensors, photocatalysts, optoelectronics, and solar photocell. Magnesium-doped zinc oxide (Mg-ZnO) nano powders were effectively produced using a basic chemical precipitation process at 45°C. Calcined Mg-ZnO nano powders have been characterized by FTIR, XrD, SEM-EDX and Pl studies. XRD measurements from Mg-ZnO revealed development of a crystalline structure with an average particle size of 85 nm and SEM analysis confirmed the spherical morphology. Electrochemical property of produced Mg-ZnO nanoparticles was analyzed and the specific capacitance value of 729 F g-1 at 0.5 A g-1 current density was recorded and retained a specific capacitance ~100 percent at 2 A g-1 current density.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1141-1148
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical dispersion characterization of sprayed Zn1-xMnxO thin films
    Autorzy:
    Habubi, N.F.
    Chiad, S.S.
    Oboudi, S.F.
    Toma, Z.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411575.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    TCOs
    Dispersion parameters
    spray pyrolysis
    zinc oxide
    Zn1-xMnxO
    Opis:
    Uniform and adherent Zn1-xMnxO films have been deposited by using spray pyrolysis technique on glass substrates. The optical properties and dispersion parameters of zinc oxide have been studied as a function of doping concentration with Mn. Changes in direct optical energy band gap of cobalt oxide films were confirmed after doping, The optical energy gap Eg increased from 3.13 eV for the undoped ZnO to 3.39 eV with increasing the doping concentration of Mn to 4%. The changes in dispersion parameters and Urbach tails were investigated. An increase in the doping concentration causes a decrease in the average oscillator strength. The single-oscillator parameter has been reported.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 4; 1-8
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Struktury fotowoltaiczne oparte o heterozłącze ZnO/Si
    Photovoltaic Structures Based on Heterojunction Zno/Si
    Autorzy:
    Pietruszka, R.
    Łuka, G.
    Witkowski, B. S.
    Kopalko, K.
    Zielony, E.
    Biegański, P.
    Płaczek-Popko, E.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/952439.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    fotowoltaika
    tlenek cynku
    metoda osadzania warstw atomowych
    photovoltaic
    zinc oxide
    Opis:
    Warstwy tlenku cynku otrzymane metodą osadzania warstw atomowych ALD zostały użyte jako n-typu partner dla p-typu krzemu. Jako przezroczystą górną elektrodę wybrano warstwę tlenku cyku domieszkowaną glinem (tak zwana warstwa TCO – Transparent Conductive Oxide). Użyto tanich podłóż krzemowych o niezoptymalizowanej dla zastosowań fotowoltaicznych grubości. W niniejszej pracy badano proste struktury fotowoltaiczne ZnO/Si w celu redukcji kosztów produkcji energii elektrycznej pozyskiwanej za pomocą ogniw fotowoltaicznych. Zmierzona sprawność zoptymalizowanych częściowo (warstwy ZnO) ogniw fotowoltaicznych wyniosła 6%.
    We report on the properties of photovoltaic (PV) structures based on thin films of n-type zinc oxide grown by atomic layer deposition method on a cheap silicon substrate. Thin films of ZnO are used as n-type partner to p-type Si (110) and, when doped with Al, as a transparent electrode. PV structures with different electrical parameters and thicknesses of ZnO layers were deposited to determine the optimal performance of PV structures. The best response we obtained for the structure with ZnO layer thickness of 800 nm. The soobtained PV structures show 6% efficiency.
    Źródło:
    Prace Instytutu Elektrotechniki; 2014, 264; 113-123
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biological Approach for the Synthesis and Characterization of Zinc Oxide Nanopaticles from Croton bonplandianum Baill. Extracts
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1112329.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Croton bonplandianum
    Plant extracts
    UV-Visible spectrophotometry
    Zinc oxide nanoparticles
    Opis:
    The biogenesis of nanoparticles recently gained more attention. Here, we report the biogenesis of zinc oxide (ZnO) nanoparticles using aqueous extracts of the leaves, stem, root, flowers and fruits of Croton bonplandianum Baill. at room temperature. Croton bonplandianum is an important medicinal plant used to cure many pathological conditions in the traditional systems of Indian medicines due to the presence of important and specific bioactive compounds in the plant parts of this plant. Aqueous solution of Zinc Nitrate hexahydrate [Zn(NO3)2·6H2O] was used as a precursor and the various plant extracts played as reducing agents. The formation of ZnO nanoparticles was monitored by UV-Visible spectrophotometric analysis. The leaf extract showed strong absorbance peak at 302 nm, stem and fruit at 293 nm, root at 290 nm and flowers at 305 nm.
    Źródło:
    World News of Natural Sciences; 2018, 19; 95-107
    2543-5426
    Pojawia się w:
    World News of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Membrany polimerowe modyfikowane tlenkiem cynku - metoda wytwarzania
    Polymer membranes modified by zinc oxide - method of preparation
    Autorzy:
    Bojarska, M.
    Szwast, M.
    Jakubiak, Sz.
    Michalski, J.
    Gradoń, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2072155.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    membrany
    modyfikacja
    nanopręciki tlenku cynku
    membrane
    modification
    zinc oxide nanowires
    Opis:
    W pracy zaproponowano wytworzenie membrany mikrofiltracyjnej zmodyfikowanej nanopręcikami tlenku cynku, co zapobiega niekorzystnemu zjawisku biofoulingu. Wykorzystano kapilarne membrany polipropylenowe Połymemtech o średniej średnicy porów ok. 0,3 um, najczęściej stosowane w procesie mikrofiltracji. Wzrost nanopręcików tlenku cynku prowadzono dwiema metodami: metodo hydrotermiczną i poprzez depozycję chemiczną. Druga metoda wydaje się najbardziej obiecującą. Zgodnie z nią zaszczepiono centra nukleacji na powierzchni membrany, a wzrost nanopręcików tlenku cynku odbywał się w temperaturze 85°C przez 40 min w roztworze zawierającym amoniak, octan cynku oraz 2-etanoloaminę. Uzyskano równomierne i gęste upakowanie nanopręcików tlenku cynku na powierzchni membrany, a ich długość była nieco mniejsza niż 100 nm.
    The preparation of modified microfiltration membrane with zinc oxide nanowires which prevents the adverse phenomena of biofouling is proposed in the paper. The Polymemtech polypropylene capillary membrane having an average pore diameter of about 0.3 цт, most often applied in microfiltration, was used. Growth of zinc oxide nanowires were carried out by hydro- thermal and chemical deposition methods. The second method seems to be the most promising. According to it, nucleation centers were seeded on the membrane surface and zinc oxide nanowires grow at temperature of 85°C for 40 min in a solution containing ammonia, zinc acetate and 2-ethanol- amine. Even and dense packing of zinc oxide nanowires with length slightly less than 100 nm was obtained on membrane surface.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2013, 6; 521--522
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ozone decomposition on ZnO catalysts obtained from different precursors
    Autorzy:
    Milenova, Katya I.
    Nikolov, Penko M.
    Kasabova, Nikoleta A.
    Avramova, Ivalina A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778353.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ozone decomposition
    zinc oxide catalyst
    manganese doping
    copper doping
    nanosize
    Opis:
    Kinetic investigations for ozone conversion on three different series of zinc oxide catalysts, containing pure ZnO and doped with Mn or Cu one with dopant content less than 1 wt.% were carried out. The different samples were obtained from carbonate, nitrate and acetate precursors. The as prepared catalysts were characterized by AAS, XRD, IR, EPR and BET methods. The mean size of the crystallites determined by XRD data is in the range 27÷68 nm. The presence of Mn2+ and Cu2+ ions into the ZnO matrix was established by EPR. The ozone decomposition was investigated for 30÷75°C temperature range. The zinc carbonate precursor samples show highest activity, while the nitrate precursor ones show lowest activity toward reaction decomposition of ozone in the whole temperature range. At 75°C two of the catalyst, obtained from carbonate precursor - ZnO and CuZnO show 100% conversion.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 4; 55-59
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of ZnO nanoparticles synthesis
    Autorzy:
    Zelechowska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/80495.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanoparticle
    zinc oxide
    green chemistry
    nanostructure
    genetically modified organism
    biosynthesis
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2014, 95, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zinc oxide nanoparticles synthesis from Moringa oleifera Lam. Extracts and their characterization
    Autorzy:
    Manokari, M.
    Shekhawat, Mahipal S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192606.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Zinc oxide nanoparticles
    Moringa oleifera
    UV-Visible spectroscopy
    Reaction medium
    Opis:
    The enormous applications of metal nanoparticles urged to find new biologically hazard free methods for huge synthesis. The green synthesis approaches are acknowledged by many scientists due to its cost effective, simple, eco-friendly and resourceful move. The present investigation deals with the bio-production and characterization of zinc oxide (ZnO) nanoparticles using leaf, stem, flowers and fruit pods of the medicinal plant Moringa oleifera. The synthesis of ZnO nanoparticles from the aqueous extracts were mediated by Zinc Nitate Hexahydrate as precursor. Various parameters like time periods, concentration of plant extracts and different temperatures were influenced the synthesis of ZnO nanoparticles. The stability and reduction of zinc ions to ZnO nanoparticles were characterized by UV-Visible spectroscopic analysis. The reaction medium from the leaves and flowers showed strong absorption at 308nm. The stem and fruit pods reaction medium existed absorption peak at 293nm.
    Źródło:
    World Scientific News; 2016, 55; 252-262
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on separation of low-grade zinc oxide ore with sulfurization-amination flotation
    Autorzy:
    Feng, Dongxia
    Bai, Lin
    Xie, Haiyun
    Tong, Xiong
    Powiązania:
    https://bibliotekanauki.pl/articles/109605.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    low-grade zinc oxide ore
    sulfurization-amination flotation
    grinding fineness
    Opis:
    With the continuous depletion of a large number of zinc sulphide ores that are easy to treat, the finely disseminated and refractory low-grade zinc oxide ores has become an important source for the production of zinc minerals. In this paper, a sulfurization-amination flotation process has been proposed for concentrating large amounts of low-grade zinc oxide ore in Lanping, Yunnan Province. Spectrum analysis, chemical analysis and element analysis was performed to provide research basis for process design and operational control. The main influencing factors during the process, including grinding fineness, reagent types and dosage, etc., have been studied through flotation tests. The results showed that the optimum grinding fineness was -0.074 mm accounting for 89.78% for the target run-of mine ore. Moreover, optimum dosages of sodium carbonate, sodium silicate, sodium hexametaphosphate, sodium sulphide and octadecylamine were determined as 1500 g/t, 500 g/t, 200g/t, 8000 g/t and 500 g/t, respectively. Under these conditions, an open circuit test and a closed circuit test with one stage rougher, two stage scavenger and three stage cleaner flotation were carried out with the run-of-mine ore with a zinc grade of 6.52% and the oxidation ratio of 94.62%. The zinc concentrate can be obtained with zinc grade of 44.09% at a zinc recovery of 66.35% with a 9.70% yield of zinc concentrate yield. The results confirmed the validity and practicability of the proposed process design and experimental operation. This study is of special value as it provides referencing significance for economically exploiting low-grade zinc oxide ore.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1082-1090
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proekologiczne kompozyty gumowe o obniżonej zawartości cynku
    Pro-ecological rubber composites with reduced content of zinc
    Autorzy:
    Maciejewska, M.
    Sowińska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/412674.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Skórzanego
    Tematy:
    elastomer
    wulkanizacja
    aktywator
    tlenek cynku
    sole cynku
    vulcanization
    activator
    zinc oxide
    zinc salts
    Opis:
    Wyroby gumowe zawierające więcej niż 2,5% związków cynku uznaje się za toksyczne dla ekosystemów wodnych. Opracowano skład proekologicznych kompozytów z kauczuku butadienowo-akrylonitrylowego (NBR) o obniżonej zawartości jonów cynku. W roli aktywatorów wulkanizacji zastosowano acetyloacetonian, glukonian i rycynoleinian cynku, jako alternatywę do ZnO. Aplikacja soli cynku nie miała wpływu na czas i temperaturę wulkanizacji NBR. Uzyskano wulkanizaty o nieznacznie mniejszej gęstości usieciowania i twardości, podwyższonej wytrzymałości na rozciąganie i porównywalnej odporność na starzenie klimatyczne. Zastosowanie soli cynku umożliwiło 10-krotne zmniejszenie ilości jonów cynku w wyrobach gumowych.
    Rubber products containing more than 2.5% of zinc compounds are classified as toxic to aquatic ecosystems. Therefore, the aim of the research was to develop pro-ecological rubber composites of acrylonitrile-butadiene rubber (NBR) with a reduced content of zinc ions. Acetylacetonate, gluconate and zinc ricinoleate were used as vulcanization activators alternatively to ZnO. Their application had no significant effect on the time and temperature of NBR vulcanization. Vulcanizates with slightly lower crosslink density and hardness, higher tensile strength and comparable resistance to weather aging were obtained. Application of zinc salts enabled a 10-fold reduction in the content of zinc ions in rubber products.
    Źródło:
    Technologia i Jakość Wyrobów; 2018, 63; 55-65
    2299-7989
    Pojawia się w:
    Technologia i Jakość Wyrobów
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrometallurgical treatment of non-sulfide zinc ore for precipitation of zinc oxide nanoparticles
    Autorzy:
    Abdel-Aal, E.-S. A.
    Rashad, M. M.
    El-Shazly, A. N.
    Ibrahim, I. A.
    El-Shahat, M. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/110748.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc ore
    sulfuric acid leaching
    filtration rate
    zinc sulfate
    zinc oxide nanoparticles
    MB photocatalytic degradation
    Opis:
    Acid leaching of Egyptian zinc ore from the Um Gheig area was carried out with sulfuric acid. This study determines the optimum conditions for dissolution of non-sulfide zinc ore. The optimum conditions are 25% -74m particle size, 45 °C temperature, 2 h leaching time, 1.1 stoichiometric molar ratio of H2SO4 to Zn, 1:3 solid/liquid ratio. The maximum filtration rate is 1.6 Mg Zn•m-2•day-1at pressure difference of 0.80 bar. The zinc recovery is about 90%. As the zinc ore contains zinc silicate, some additives were tested to enhance filtration and prevent formation of silica gel. To increase the added value of the product, zinc oxide was precipitated by a co-precipitation method in a nanosize powder with average particle size ~ 20 nm. Photocatalytic degradation of methylene blue dye under UV light using ZnO nanopowders produced at different conditions was investigated. Photocatalytic efficiency with methylene blue (MB) concentration was reduced as much as 85% in 240 min with the produced nanoparticles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 729-737
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, Electrical, and Optical Properties of ZnO Films Grown by Atomic Layer Deposition at Low Temperature
    Autorzy:
    Park, Ji-Young
    Weon, Ye Bin
    Jung, Myeong Jun
    Choi, Byung Joon
    Powiązania:
    https://bibliotekanauki.pl/articles/2174578.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    ZnO
    atomic layer deposition
    low temperature growth
    optoelectronic properties
    Opis:
    Zinc oxide (ZnO) is a prominent n-type semiconductor material used in optoelectronic devices owing to the wide bandgap and transparency. The low-temperature growth of ZnO thin films expands diverse applications, such as growth on glass and organic materials, and it is also cost effective. However, the optical and electrical properties of ZnO films grown at low temperatures may be inferior owing to their low crystallinity and impurities. In this study, ZnO thin films were prepared by atomic layer deposition on SiO2 and glass substrates in the temperature range of 46-141℃. All films had a hexagonal würtzite structure. The carrier concentration and electrical conductivity were also investigated. The low-temperature grown films showed similar carrier concentration (a few 1019 cm-3 at 141°C), but possessed lower electrical conductivity compared to high-temperature (>200°C) grown films. The optical transmittance of 20 nm thin ZnO film reached approximately 90% under visible light irradiation. Additionally, bandgap energies in the range of 3.23-3.28 eV were determined from the Tauc plot. Overall, the optical properties were comparable to those of ZnO films grown at high temperature.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1503--1506
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Materials based on chitosan enriched with zinc nanoparticles for potential applications on the skin
    Autorzy:
    Kulka, Karolina
    Szmejkowska, Andżelika
    Sionkowska, Alina
    Wypij, Magdalena
    Golińska, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/27324035.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    chitosan
    zinc oxide nanoparticles
    polymer films
    antimicrobial activity
    chitozan
    biomateriały
    biodegradowalność
    Opis:
    Chitosan as a nontoxic, biodegradable, and biocompatible biopolymer with film-forming properties can also be modified to improve its parameters. Modification of polymer films by the addition of nanoparticles is an increasingly common solution due to the higher efficiency of products at the nanoscale compared to the macroscale. In this work, thin chitosan films enriched with biogenic zinc oxide nanoparticles (ZnONPs) from Fusarium solani IOR 825 were obtained by the solvent evaporation method. The influence of nanoadditive on the physicochemical, mechanical, and antimicrobial properties of the polymeric matrix was evaluated. Two different concentrations of ZnONPs were added to the chitosan solution. Spectrometric measurements, mechanical tests, microscopic imaging, and microbiological tests were performed for nanoparticlesmodified and control samples. Analysis revealed that ZnONPs influence the properties of chitosan films. FTIR spectroscopy showed changes that are the result of interactions between polymer matrix and the additive. Modified samples were characterized by increased values of Young’s modulus and tensile strength. SEM analysis combined with energy-dispersive X-ray spectrometry confirmed the presence of zinc in the modified films. The addition of nanoparticles slightly affected the surface morphology of the tested samples, and an increase in roughness was observed. Microbiological tests showed the biostatic activity of the films containing ZnONPs. The obtained films based on chitosan with the addition of ZnONPs can be considered easy-to-obtain biomaterials with potential use as cosmetic and biomedical products.
    Źródło:
    Engineering of Biomaterials; 2022, 25, 167; 24--31
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal conditions for levan biopolymer production and its use in the synthesis of bactericidal levan-ZnO nanocomposite
    Autorzy:
    Taran, M.
    Lotfi, M.
    Safaei, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/80561.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biopolymer
    levan biopolymer
    zinc oxide
    nanocomposite
    Taguchi method
    antibacterial activity
    Zymomonas mobilis
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of thin films of high-k oxides grown by atomic layer deposition at low temperature for electronic applications
    Autorzy:
    Gieraltowska, S
    Wachnicki, Ł
    Witkowski, B S
    Godlewski, M
    Guziewicz, E
    Powiązania:
    https://bibliotekanauki.pl/articles/173591.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    high-k oxides
    composite layers
    atomic layer deposition
    transparent electronics
    zinc oxide
    Opis:
    Thin films of high-k oxides are presently used in semiconductor industry as gate dielectrics. In this work, we present the comparison of structural, morphological and electrical properties of binary and composite layers of high-k oxides that include hafnium dioxide (HfO2), aluminum oxide (Al2O3) and zirconium dioxide (ZrO2). We deposit thin films of high-k oxides using atomic layer deposition (ALD) and low growth temperature (60–240 °C). Optimal technological growth parameters were selected for the maximum smoothness, amorphous microstructure, low leakage current, high dielectric strength of dielectric thin films, required for gate applications. High quality of the layers is confirmed by their introduction to test electronic structures, such as thin film capacitors, transparent thin film capacitors and transparent thin film transistors. In the latter structure we use semiconductor layers of zinc oxide (ZnO) and insulating layers of high-k oxide grown by the ALD technique at low temperature (no more than 100 °C).
    Źródło:
    Optica Applicata; 2013, 43, 1; 17-25
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena efektywności procesu fotodegradacji barwników azowych w obecności tlenku cynku
    The assessment of the effectiveness of photodegradation of azo-dyes in the presence of zinc oxide
    Autorzy:
    Adamek, E.
    Baran, W.
    Szołtysek-Bołdys, I.
    Sobczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/126461.pdf
    Data publikacji:
    2015
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    barwniki azowe
    fotokatalityczna degradacja
    tlenek cynku
    azo dyes
    photocatalytic degradation
    zinc oxide
    Opis:
    Trudności w usuwaniu zanieczyszczeń pochodzących z przemysłu włókienniczego (tzw. barwne ścieki) stanowią ważny problem, głównie w krajach rozwijających się. Jest to spowodowane m.in. trwałością i odpornością barwników na procesy biodegradacji oraz niecałkowitym usuwaniem w oczyszczalniach ścieków. Jednym z rozwiązań może być połączenie konwencjonalnego oczyszczania z tzw. metodami pogłębionego utleniania, do których zalicza się procesy fotokatalityczne. Celem niniejszej pracy była ocena efektywności procesu fotokatalitycznej degradacji barwników azowych (kationowych i anionowych) w ich roztworach wzorcowych w obecności tlenku cynku (ZnO) jako fotokatalizatora. Dla roztworu każdego barwnika, przy różnym pH (3,0-10,5) oraz dla różnych ilości ZnO (25-500 mg), wyznaczano stopień adsorpcji, stopień fotodegradacji oraz stałe szybkości reakcji degradacji. Stwierdzono, że wszystkie badane barwniki były odporne na fotolizę, a w obecności ZnO i pod wpływem promieniowania UV uległy fotokatalitycznej degradacji. Omawiane procesy rozkładu przebiegały każdorazowo zgodnie z kinetyką reakcji pseudopierwszego rzędu względem degradowanego barwnika. Najkorzystniejsze warunki do przeprowadzenia fotokatalitycznej degradacji dla prawie wszystkich barwników to pH 8,5-9,5 oraz 1,0 g ZnO/dm3. Wykazano również zależność pomiędzy stopniem adsorpcji barwników na powierzchni fotokatalizatora i stopniem ich fotodegradacji a pH roztworu i budową barwnika.
    Difficulties in removing of pollutants from textile industry (the so-called coloured effluent) are a significant problem, particularly in the developing countries. It is caused by, among other, stability and resistance of dyes to biodegradation processes and incomplete removal of dyes in wastewater treatment plants. One of the solutions may be a combination of the conventional, mechanical-biological treatment with advanced oxidation processes, which include photocatalytic processes. The aim of this study was to evaluate the efficiency of photocatalytic degradation of azo dyes (cationic and anionic) in the standard solutions in the presence of zinc oxide (ZnO) as a photocatalyst. The degree of dyes adsorption, the degree of photodegradation and reaction rate constants were determined in each dye solution at different pH values (3.0-10.5) and at different amounts of ZnO (25-500 mg). All the investigated azo-dyes were resistant to photolysis and they underwent the photocatalytic degradation in the presence of ZnO and under UV-irradiation. In each case the processes were carried out in accordance with the kinetics of pseudo-first order reaction with respect to the degraded dye. The most favourable conditions to the photocatalytic degradation for almost all azo-dyes were: pH 8.5-9.5 and 1.0 g ZnO/dm3. Additionally, a relationship between the degree of dyes adsorption on the photocatalyst surface, the degree of photodegradation and pH of the dyes solutions and the dye structure was also stated.
    Źródło:
    Proceedings of ECOpole; 2015, 9, 2; 523-531
    1898-617X
    2084-4557
    Pojawia się w:
    Proceedings of ECOpole
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of concomitant use of nano-structured essential metals and sulfur on growth characteristics of safflower
    Autorzy:
    Janmohammadi, Mohsen
    Seifi, Akbar
    Sabaghnia, Naser
    Aghaee, Ahmad
    Dashti, Shahriar
    Powiązania:
    https://bibliotekanauki.pl/articles/763914.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    balanced nutrition, calcareous soils, combined application, nano-chelated micronutrients, nano zinc oxide
    Opis:
    Deficiencies of zinc, manganese and iron are common in calcareous soils of arid and semiarid regions due to their reduced solubility alkaline conditions. However, sustainable crop production is essential for growing population. Sulfur fertilizers can increase micronutrients availability by decreasing soil pH. In order to investigate the influence of nano-chelated essential metals (Zn, Mn, Fe) and sulfur application (zero and 40 kg ha-1) an experiment was carried out in Maragheh, northwest of Iran. Phenological development, morphological and agronomic traits significantly responded to both factors. Results revealed that application of sulfur fertilizer considerably increased morphological traits such as ground cover, stem diameter, plant height and capitulum diameter. Mean comparison between nano-chelated metal showed that the highest value for seed yield and yield components (number of the capitulum per plants, seed number per capitulum and seed weight) was achieved through the application of nano-chelated Zn. The best performance was related to combined application of sulfur and nano-chelated Zn which was followed by nano-chelated Fe. Seed oil content was only affected by nano-metals, so the highest value was obtained by application of nano-chelated Zn. Overall our finding revealed that integrated application of sulfur and essential metals, especially Zn, is required to grow safflower successfully on calcareous soils. The efficiency of nano-chelated fertilizers can be noticeably increased by balanced nutrient management in semi-arid regions.
    Źródło:
    Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia; 2016, 71, 1
    2083-3563
    0066-2232
    Pojawia się w:
    Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex electrothermal processing of an oxide zinc-containing ore of the Shaymerden deposit
    Autorzy:
    Shevko, V.
    Karataeva, G.
    Tuleev, M.
    Badikova, A.
    Amanov, D.
    Abzhanova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110855.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcium carbide
    electrosmelting
    zinc-containing oxide ore
    ferroalloy
    zinc sublimates
    Opis:
    Oxide ores are potential world raw materials sources of zinc manufacture. Despite a sufficiently high extraction level of zinc and lead known pyrometallurgical methods are characterized by formation of large quantity of industrial wastes therefore a complex use level of these raw materials is low. Hydrometallurgical methods are mainly applied for extraction of nonferrous metals. The present article contains the research results of complex processing an oxide ore of the Shaymerden deposit (Kazakhstan), consisting in the simultaneous production of a ferroalloy, calcium carbide and zinc sublimates from the ore in a thermal-ore arc electric furnace. The researches have been carried out with use of a HSC 5.1 software package (based on a principle of Gibbs energy minimum) and electrical smelting the ore in a monoelectrode arc electric controlled-output furnace. It was found, that in equilibrium conditions in a system ore-carbon-iron gaseous zinc is formed at Т > 1073 K, FeSi at Т > 1573 K, CaC2 at Т > 2073 K, Si at Т > 1673 K. The electrosmelting of ore in an arc furnace using of 38.7-40% coke and 16-28.4% steel cuttings the conversion degree of silicon into an alloy is 75-77%, calcium to calcium carbide 77-81%, zinc to sublimates 99.3%. The ferroalloy obtained contains 19.6-41.3% of silicon, the calcium carbide is characterized by capacity of 110-250 m3/kg, and the zinc sublimates contain 66-67% of zinc. The -suggested method allows to increase the combined usage of the ore from 35.6 to 89.6%.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 955-964
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insecticidal efficiency and safety of zinc oxide and hydrophilic silica nanoparticles against some stored seed insects
    Autorzy:
    Haroun, S.A.
    Elnaggar, M.E.
    Zein, D.M.
    Gad, R.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084748.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Callosobruchus maculatus
    hydrophilic silica nanoparticles
    Sitophilus oryzae
    Tribolium castaneum
    wheat
    zinc oxide nanoparticles
    Opis:
    The present study was conducted to evaluate the insecticidal efficiency and safety of zinc oxide nanoparticles (ZnO NPs) and hydrophilic silica nanoparticles (SiO2 NPs) against: adults of rice weevil (Sitophilus oryzae L.); red flour beetle (Tribolium castaneum Herbst.) and cowpea beetle (Callosobruchus maculatus F.) results showed that, both ZnO NPs and hydrophilic SiO2 NPs exhibited a significant toxic effect (df, F and p < 0.5) against S. oryzae and C. maculatus at the highest concentration while T. castaneum showed high resistance against the two tested materials. At the end of the experiment, recorded mortality was: 81.6, 98.3 and 58.3% at the highest concentration used for each insect (0.3, 2 and 8 gm ⋅ kg–1 of SNPs with C. maculatus, S. oryzae and T. castaneum, respectively), while mortality was 88.3, 100 and 38.3% at the highest concentration used for each insect (0.6, 2.5 and 8 gm ⋅ kg–1 of ZnO NPs with C. maculatus, S. oryzae and T. castaneum, respectively). Both tested materials caused high reductions in F1-progeny (%) with C. maculatus and S. oryzae. Histopathological examination of male mice livers showed hepatic architecture with congested blood sinusoids, binucleated hepatocytes nuclei, dilated central vein and margainated chromatin in some nuclei. Histopathological assessment of the lungs showed normal histoarchitecture. There were no differences in alveolar septa, bronchiolar and epithelium of the treated and untreated animals. Silica and zinc oxide nanoparticles have a good potential to be used as stored seed protectant alternatives if applied with proper safety precautions.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 1; 77-85
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Lattice Damage and Recovery of Rare-Earth implanted Wide Bandgap Oxides
    Autorzy:
    Sarwar, Mahwish
    Ratajczak, Renata
    Ivanov, Vitalii
    Mishra, Sushma
    Turek, Marcin
    Wierzbicka, Aleksandra
    Woźniak, Wojciech
    Guziewicz, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/2204945.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wide bandgap oxides
    zinc oxide
    gallium oxide
    rare earth
    ion implantation
    Rutherford backscattering spectrometry
    low temperature photoluminescence
    Opis:
    Rare earth (RE) elements are important for the optical tuning of wide bandgap oxides (WBO) such as β-Ga2O3 or ZnO, because β-Ga2O3:RE or ZnO:RE show narrow emission lines in the visible, ultra-violet and infra-red region. Ion implantation is an attractive method to introduce dopant into the crystal lattice with an extraordinary control of the dopant ion composition and location, but it creates the lattice damage, which may render the dopant optically inactive. In this research work, we investigate the post-implantation crystal lattice damage of two matrices of wide-bandgap oxides, β-Ga2O3 and ZnO, implanted with rare-earth (RE) to a fluence of 5 x 10^14, 1 x 10^15 and 3 x 10^15 atoms/cm^2, and post-growth annealed in Ar and O2 atmosphere, respectively. The effect of implantation and annealing on both crystal lattices was investigated by channeling Rutherford backscattering spectrometry (RBS/C) technique. The level of crystal lattice damage caused by implantation with the same RE fluences in the case of β-Ga2O3 seems to be higher than in the case of ZnO. Low temperature photoluminescence was used to investigate the optical activation of RE in both matrices after performed annealing.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 147--154
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refractive index and salinity sensors by gallium-doped zinc oxide thin film coated on side-polished fibers
    Autorzy:
    Tien, Chuen-Lin
    Mao, Hao-Sheng
    Mao, Tzu-Chi
    Powiązania:
    https://bibliotekanauki.pl/articles/1835762.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    refractive index
    thin film
    side-polished fiber
    lossy mode resonance
    gallium-doped zinc oxide
    Opis:
    This work presents a high-sensitivity refractive index and salinity sensor by using fiber-optic side-polishing and electron-beam evaporation techniques. Thin film coated on the flat surface of side-polished fibers can generate a lossy mode resonance (LMR) effect. A gallium-doped zinc oxide (GZO) thin film was prepared by an electron-beam evaporation with the ion assisted deposition method. The residual thickness of the side-polished fiber was 76.5 μm, and GZO film thickness of 69 nm was deposited on the flat surface of the side-polished fiber to fabricate LMR-based fiber sensors. The variation in the optical spectrum of LMR-based fiber sensors was measured by different refractive index saline solutions. The LMR wavelength shift is caused by the refractive index change, which is nearly proportional to the salinity. The corresponding sensitivity of the proposed fiber-optic sensor was 3059 nm/RIU (refractive index unit) for the refractive index range of 1.333 to 1.398. To evaluate the sensitivity of LMR salinity sensors, the saline solution salinities of 3.6%, 7.3%, 10.9%, 14.6%, 18.2% and 21.9% were measured in this work. The experimental result shows that the sensitivity of the proposed salinity sensor is 9.94 nm/%.
    Źródło:
    Optica Applicata; 2021, 51, 1; 23-36
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid ZnO/ZnO-NPs nanofibres fabricated via electrospinning
    Autorzy:
    Matysiak, W.
    Zaborowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/367311.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    nanomaterials
    electron microscopy
    amorphous materials
    zinc oxide
    nanomateriały
    mikroskopia elektronowa
    materiały amorficzne
    tlenek cynku
    Opis:
    Purpose: Due to the growing interest and multitude of possible applications, zinc oxide nanowires, including those doped with ZnO nanoparticles, can became, alongside carbon nanotubes, a very desirable material which use is predicted in the construction of nanogenerators, dye sensitized solar cells, optoelectronics or ultrasensitive gas detectors. Design/methodology/approach: The electrospinning process allows for low-cost and scalable production of fibrous mats with diameters from a few to several hundred nanometers. What is more, electrospinning method has gained popularity also due to its versatility, now it is possible to produce fibres from almost every known polymer and the simplicity and lack of any additional functionalization of the obtained nanomaterials. The application of the calcination process to remove the polymer matrix from the obtained nanofibres results in the creation of ceramic nanofibres. Findings: Among the existing methods for the production of ceramic nanostructures, including the hydrothermal, physical and chemical vapour deposition methods, nanolithography or molecular self-assembly, the electrospinning process creates the possibility of fabricating one-dimensional nanostructures with unprecedented properties, good quality, no additional functionalization and purification. Research limitations/implications: Due to ongoing research on the potential applications of zinc oxide nanostructures, including photovoltaics, sensorics and electronics, the most predictable behaviour and properties of ZnO nanowires characterize those nanomaterials that exhibit a periodic structure of the crystal lattice. Considering the optimization of the parameters of the method of producing ceramic zinc oxide nanowires doped with crystalline ZnO nanoparticles, it is worth analysing the thermal treatment parameters of nanofibres. Practical implications: Although amorphous structure, hybrid ZnO nanofibres could be used as humidity sensors with much higher sensing properties than crystalline ZnO nanostructures. Originality/value: Low-cost, scalable production of ceramic nanofibres for most technical applications.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 94, 1-2; 5-12
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrotermalna synteza nano tlenku cynku z zastosowaniem wybranych substancji strącających
    Hydrothermal synthesis of nano zinc oxide with selected precipitating substance application
    Autorzy:
    Strachowski, T
    Powiązania:
    https://bibliotekanauki.pl/articles/168146.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    synteza hydrotermalna
    strącanie
    nanotlenek cynku
    reaktor mikrofalowy
    hydrothermal synthesis
    precipitation
    nano zinc oxide
    microwave reactor
    Opis:
    Celem pracy było zbadanie wpływu zastosowanych substancji strącających na morfologię, wielkość ziarna nano tlenku cynku otrzymanego metodą hydrotermalną w reaktorze mikrofalowym. Jako substancji strącających użyto: zasady potasowej, mocznika, amoniaku oraz trietanoloaminy (TEA). Przeprowadzone eksperymenty pokazały jak istotny wpływ na właściwości otrzymywanego produktu ma dobór odpowiednich substancji strącających. Zauważyć można różny kształt ziaren, ich wielkość oraz powierzchnię właściwą. Wyniki przedstawione w niniejszym artykule są kontynuacją pracy nad doborem optymalnego reaktora do syntez hydrotermalnych nano tlenku cynku. Zamieszczone wyniki autor przedstawił w swojej rozprawie doktorskiej.
    The aim of this study was to investigate the effect of the substance precipitating on the morphology, particle size nano zinc oxide derived hydrothermal method in a microwave reactor. Was used as the precipitating substances: potassium hydroxide, urea, ammonia and triethanolamine (TEA). Conducted experiments have shown a significant effect on the properties of the resultant product is the selection of suitable precipitants. However, there were different grain shape, size and surface area. The results presented in this article is a continuation of work on the selection of the optimal reactor for hydrothermal synthesis of nano zinc oxide. Posted by results presented in his doctoral thesis.
    Źródło:
    Szkło i Ceramika; 2013, R. 64, nr 2, 2; 28-33
    0039-8144
    Pojawia się w:
    Szkło i Ceramika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Weave Structures and Zinc Oxide Nanoparticles on the Ultraviolet Protection of Cotton Fabrics
    Wpływ struktur splotów i nanocząstek tlenku cynku na ochronę UV tkanin bawełnianych
    Autorzy:
    Timothy, R.
    Arul Pragasam, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/232702.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    UPF
    spectrophotometric
    weave factor
    zinc oxide nanoparticles
    promieniowanie ultrafioletowe
    spektrofotometria
    współczynnik tkania
    nanocząsteczki tlenku cynku
    Opis:
    The protection provided by clothing against ultraviolet (UV) radiation has been the subject of considerable recent research. However, there is a lack of information concerned with the effect of weave structures and zinc oxide nanoparticles on these properties. A series of cotton fabrics differing in weave structure was produced and treated with zinc oxide nanoparticles. These fabrics were spectrophotometrically assessed and the UV protection factor calculated. It was found that while there was no significant difference in the Ultraviolet Protection Factor (UPF) in untreated samples, in samples treated with zinc oxide nanoparticles an increase was noticed in satin and granite weaves. There is no relationship between weave parameters and the UPF. Also between porosity and the UPF, no relationship was noticed. Thus the present study provides design guidelines for clothing manufacturers.
    Ochrona zapewniana przez odzież przed promieniowaniem ultrafioletowym (UV) była przedmiotem wielu badań. Brak jest jednak informacji dotyczących wpływu struktur splotów i nanocząstek tlenku cynku na te właściwości. Przedmiotem pracy było wytworzenie tkanin bawełnianych różniących się strukturą splotów, a następnie poddano te tkaniny obróbce nanocząstkami tlenku cynku. Tkaniny te zostały ocenione spektrofotometrycznie i obliczono współczynnik ochrony przed promieniowaniem UV. Stwierdzono, że chociaż nie było istotnej różnicy we współczynniku ochrony przed promieniowaniem ultrafioletowym (UPF) w nieobrabianych próbkach, w próbkach obrabianych nanocząsteczkami tlenku cynku zauważono wzrost w splocie satynowym i granitowym. Stwierdzono, że nie ma związku pomiędzy parametrami splotu a UPF. Również między porowatością a UPF nie zauważono żadnego związku. Przedstawione wyniki badań mogą być źródłem wytycznych projektowych dla producentów odzieży.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 1 (127); 113-119
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Briquetting of EAF Dust for its Utilisation in Metallurgical Processes
    Autorzy:
    Magdziarz, A.
    Kuźnia, M.
    Bembenek, M.
    Gara, P.
    Hryniewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185804.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric arc furnace dust
    recycling
    briquetting
    zinc oxide
    elektryczny piec łukowy
    recykling
    brykietowanie
    tlenek cynku
    Opis:
    Dust generated at an electric arc furnace during steel production industry is still not a solved problem. Electric arc furnace dust (EAF) is a hazardous solid waste. Sintering of well-prepared briquetted mixtures in a shaft furnace is one of possible methods of EAFD utilisation. Simultaneously some metal oxides from exhaust gases can be separated. In this way, various metals are obtained, particularly zinc is recovered. As a result, zinc-free briquettes are received with high iron content which can be used in the steelmaking process. The purpose of the research was selecting the appropriate chemical composition of briquettes of the required strength and coke content necessary for the reduction of zinc oxide in a shaft furnace. Based on the results of the research the composition of the briquettes was selected. The best binder hydrated lime and sugar molasses and the range of proper moisture of mixture to receive briquettes of high mechanical strength were also chosen and tested. Additionally, in order to determine the thermal stability for the selected mixtures for briquetting thermal analysis was performed. A technological line of briquetting was developed to apply in a steelworks.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 263-271
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the Water-Repellent and Antifungal Properties of Electrospun Cellulose Acetate Materials by Decoration with ZnO Nanoparticles
    Poprawa właściwości hydrofobowych i przeciwgrzybicznych materiałów z elektroprzędzonego octanu celulozy poprzez zastosowanie nanocząsteczek ZnO
    Autorzy:
    Nachev, Nasko
    Spasova, Mariya
    Manolova, Nevena
    Rashkov, Iliya
    Naydenov, Mladen
    Powiązania:
    https://bibliotekanauki.pl/articles/1419513.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    cellulose acetate
    zinc oxide
    electrospinning
    electrospraying
    superhydrophobicity
    Phaeomoniella chlamydospora
    octan celulozy
    tlenek cynku
    elektroprzędzenie
    elektrorozpylanie
    superhydrofobowość
    Opis:
    Suitable conditions for the preparation of nano- and microstructured materials from cellulose acetate and cellulose acetate/ZnO from solutions/suspensions in aceton/water by electrospinning/electrospraying were found. The materials obtained were characterised by scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and contact angle measurements. The antifungal activity of the materials obtained against Phaeomoniella chlamydospora, which is one of the main species causing diseases in grapevines, was studied as well. It was found that electrospinning of CA solutions with a concentration of 10 wt% reproducibly resulted in the preparation of defect-free fibres with a mean fibre diameter of ~780 nm. The incorporation of ZnO nanoparticles resulted in the fabrication of hybrid materials with superhydrophobic properties (contact angle 152°). The materials decorated with ZnO possessed antifungal activity against P. chlamydospora. Thus, the fibrous materials of cellulose acetate decorated with ZnO particles obtained can be suitable candidates to find potential application in agriculture for plant protection.
    W pracy wskazano odpowiednie warunki do otrzymywania materiałów nano- i mikrostrukturalnych z octanu celulozy i octanu celulozy/ZnO z roztworów/zawiesin w acetonie/wodzie metodą elektroprzędzenia/elektrorozpylania. Uzyskane materiały scharakteryzowano za pomocą skaningowej mikroskopii elektronowej (SEM), dokonano analizy dyfrakcji rentgenowskiej (XRD) oraz pomiarów kąta zwilżania. Zbadano również działanie przeciwgrzybiczne uzyskanych materiałów przeciwko Phaeomoniella chlamydospora, który jest jednym z głównych gatunków wywołujących choroby winorośli. Stwierdzono, że podczas elektroprzędzenia z roztworów CA o stężeniu 10% wag. w sposób powtarzalny otrzymywano włókna wolne od defektów o średniej średnicy ~ 780 nm. Wprowadzenie nanocząstek ZnO zaowocowało wytworzeniem materiałów hybrydowych o właściwościach superhydrofobowych (kąt zwilżania 152°). Materiały z dodatkiem ZnO wykazywały działanie przeciwgrzybiczne przeciwko P. chlamydospora. Stwierdzono, że otrzymane materiały mogą być stosowane w rolnictwie do ochrony roślin.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 3 (147); 40-45
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified ceramic porous materials intended for retention viruses imitating particles from water
    Modyfikowane ceramiczne tworzywa porowate przeznaczone do usuwania z wody cząstek imitujących wirusy
    Autorzy:
    Zalewska, M.
    Szafran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355554.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    zeta potential
    electrostatic adsorption
    water purification
    tlenek cynku
    potencjał zeta
    adsorpcja elektrostatyczna
    oczyszczanie wody
    Opis:
    The main purpose of this study was to perform ceramic composite materials with active filter layers which could be applied in the process of elimination viruses imitating particles from water. In this study, the method of obtaining the active layer on the surface of the ceramic porous materials was developed and simulation of the filtration process using polymer dispersion characterized by similar size of particles to the size of viruses and negative charge at the pH of drinking water as it is in the case of viruses was carried out. In order to obtain ceramic composite materials, two types of zinc oxide were used. Application of ZnO is also beneficial because of their low toxicity to human and antibacterial properties.
    Głównym celem badań było wykonanie ceramicznych tworzyw porowatych z aktywną warstwą filtracyjną, które mogłyby skutecznie usuwać z wody cząstki imitujące wirusy. Opracowano metodę otrzymywania aktywnej warstwy na powierzchni tworzywa ceramicznego oraz przeprowadzono symulację procesu filtracji. Zastosowano dyspersję polimerową odznaczającą się wielkością cząstek zbliżoną do wielkości wirusów oraz mającą ładunek ujemny w zakresie pH wody pitnej podobnie jak to jest w przypadku wirusów. W badaniach zastosowano dwa rodzaje proszków tlenku cynku. Zastosowanie ZnO jest korzystne ze względu na ich niską toksyczność oraz właściwości antybakteryjne.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1287-1289
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kompozyty elastomerowe o polepszonych właściwościach użytkowych
    Elastomer composites with improved performance
    Autorzy:
    Sowińska, A.
    Maciejewska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412775.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Skórzanego
    Tematy:
    ciecz jonowa
    wulkanizacja
    tlenek cynku
    modyfikacja
    kompozyty SBR
    ionic liquid
    vulcanization
    zinc oxide
    modification
    SBR compounds
    Opis:
    Celem badań było uzyskanie kompozytów z kauczuku butadienowo-styrenowego (SBR) o polepszonych właściwościach użytkowych, obniżonej temperaturze i skróconym czasie wulkanizacji. Jako aktywator wulkanizacji zastosowano nanometryczny tlenek cynku zmodyfikowany cieczą jonową w masie elastomeru lub w rozpuszczalniku. Aplikacja takiego układu aktywującego pozwoliła uzyskać wulkanizaty o zwiększonej wytrzymałości na rozciąganie, twardości i odporności na starzenie termo-oksydacyjne w stosunku do zawierających mikrometryczny ZnO. Czas wulkanizacji uległ skróceniu, a temperatura i entalpia procesu zmniejszyły się. Uzyskano wulkanizaty o 50% mniejszej zawartości ZnO, zgodnie z Dyrektywą Unii Europejskiej.
    The main aim of research was to obtain elastomer composites of styrene-butadiene rubber (SBR) with improved functional properties, reduced temperature and time of vulcanization. Nanosized zinc oxide modified with ionic liquid directly in the elastomer matrix or in the solution process was used as vulcanization activator. Application of this activating system resulted in vulcanizates with increased tensile strength, hardness and resistance to thermo-oxidative aging as compared with microsized ZnO activator. The vulcanization time of SBR, the temperature and enthalpy of this process were reduced. The vulcanizates with 50% lower content of ZnO were obtained, according to the EU Directive.
    Źródło:
    Technologia i Jakość Wyrobów; 2018, 63; 35-44
    2299-7989
    Pojawia się w:
    Technologia i Jakość Wyrobów
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deposition of Zinc Oxide on the Materials Used in Medicine. Preliminary Results
    Osadzanie tlenku cynku na materiałach stosowanych w medycynie. Badania wstępne
    Autorzy:
    Teterycz, H
    Suchorska-Woźniak, P
    Fiedot, M
    Karbownik, I
    Powiązania:
    https://bibliotekanauki.pl/articles/231685.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    zinc oxide nanoparticles
    cotton gauze
    polyamide
    catheters
    bactericidal properties
    tlenek cynku
    gaza opatrunkowa
    tkanina poliamidowa
    właściwości biobójcze
    Opis:
    This paper presents preliminary results of the direct deposition of nano- and microstructures of zinc oxide on materials used in medicine. The coatings were deposited on cotton gauze and polyamide fabric. During the research the biological activity of these materials was defined. Performed were also tests of doping the ZnO structures with silver obtained. The research has proved that there is a growth of zinc oxide structures both on the gauze and polyamide fabric. The nanostructures deposited on it did not become detached from the surface, even though the material was subjected to ultrasonic rinsing. In addition, good biocidal properties of both of the textile materials modified were found. Furthermore a complex surface analysis of catheters: vascular and urological was made. ZnO was deposited on catheters, but they were characterised by low adhesion.
    W artykule przedstawiono wstępne wyniki badań bezpośredniego osadzania nano- i mikrostruktur tlenku cynku na materiałach stosowanych w medycynie. Warstwy osadzono na gazie opatrunkowej, tkaninie poliamidowej oraz cewnikach wykonanych z politetrafluoroetylenu. Podczas badań określono aktywność biologiczną czystej oraz pokrytej ZnO gazy opatrunkowej i tkaniny poliamidowej. Wykonano również próby domieszkowania otrzymywanych struktur ZnO srebrem. Badania wykazały, że na analizowanych materiałach zachodzi wzrost struktur tlenku cynku. Stwierdzono dobre właściwości biobójcze zmodyfikowanych materiałów włókienniczych. Ponadto przeprowadzono kompleksową analizę powierzchni cewników naczyniowych i urologicznych. Na ich powierzchni również tworzyły się warstwy tlenku cynku, lecz charakteryzowały się niską adhezją .
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 3 (105); 126-132
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coating synthetic materials with zinc oxide nanoparticles acting as a UV filter
    Pokrywanie materiałów syntetycznych cząstkami nano-tlenku cynku pełniącymi funkcję filtru UV
    Autorzy:
    Woźniak, B.
    Dąbrowska, S.
    Wojnarowicz, J.
    Chudoba, T.
    Łojkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/168967.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    nano zinc oxide
    UV filters
    polyethylene terephthalate (PET)
    ultrasounds
    nanotlenek cynku
    filtry UV
    politereftalan etylenu (PET)
    fale ultradźwiękowe
    Opis:
    Zinc oxide (ZnO) is one of physical filters that effectively absorb ultraviolet light in the UV-A range. ZnO produced at the Laboratory of Nanostructures was characterised by nanometric particle size of 28±4 nm (SSA BET). By coating the surface of a transparent film of polyethylene terephthalate (PET) with ZnO nanoparticles, the authors aimed at obtaining a coating that absorbs UV-A radiation. The coating process took place in a water suspension of ZnO, in which the phenomenon of acoustic cavitation was triggered, where the implosion of cavitation bubbles led to deposition of ZnO nanoparticles on the PET film surface. As part of the work, optimum parameters of the PET film coating process were developed, thus obtaining a filter in the form of a ZnO coating that effectively absorbs UV light.
    Tlenek cynku (ZnO) jest zaliczany do filtrów fizycznych skutecznie pochłaniających światło ultrafioletowe w zakresie UV-A. ZnO wytworzony w Laboratorium Nanostruktur charakteryzował się nanometryczną wielkością cząstek 28±4 nm (SSA BET). Pokrywając powierzchnię transparentnej folii z politereftalanu etylenu (PET) nanocząstkami ZnO autorzy mieli na celu uzyskanie warstwy pochłaniającej promieniowanie UV-A. Pokrywanie odbywało się w wodnej zawiesinie ZnO, w której wytworzono zjawisko kawitacji akustycznej, gdzie implozja pęcherzy kawitacyjnych prowadziła do osadzenia się nanocząstek ZnO na powierzchni folii PET. W ramach prac opracowano optymalne parametry procesu pokrywania folii PET uzyskując filtr w postaci warstwy ZnO, skutecznie pochłaniającej światło UV.
    Źródło:
    Szkło i Ceramika; 2017, R. 68, nr 3, 3; 15-17
    0039-8144
    Pojawia się w:
    Szkło i Ceramika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ZnO, CuO, Au, and TiO2 nanoparticles on Daphnia magna and early life stages of zebrafish danio rerio
    Autorzy:
    Liu, J.
    Fan, D.
    Wang, L.
    Shi, L.
    Ding, J.
    Chen, Y.
    Shen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207169.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metal oxides
    titanium dioxide
    nanoparticles
    toxicity
    zinc oxide
    Daphnia magna
    nanocząsteczki
    tlenki metali
    dwutlenek tytanu
    toksyczność
    tlenek cynku
    rozwielitki
    Opis:
    The effects of four different kinds of nanoparticles (NPs), namely, CuO, ZnO, TiO2, and Au, of the sizes ranging from <20 nm to 50 nm on Daphnia magna, early life stage of zebrafish, and various enzymes have been investigated. The experimental results showed that the NPs inhibited both the body length and hatching rate of zebrafish larvae; the small nanoparticles exhibited more toxicity. In a 21 day chronic toxicity test, metal ions of higher concentrations significantly reduced the number of Daphnia magna offspring. Studies on enzyme activity showed that the NPs reduced the glutathione content and inhibited catalase and superoxide dismutase activities, resulting in shorter body length, lower hatching success, and lower reproduction of zebrafish larvae. Therefore, studies should focus more on the potential toxicity of smaller NPs.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 139-149
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and investigation of optical, structural, and morphological characteristics of nanostructured TiO2-ZnO thin films
    Autorzy:
    Yasir, Nagham Abdulameer
    Hlail, Alzubaidy Muneer
    Mohsin, Ali Kamel
    Powiązania:
    https://bibliotekanauki.pl/articles/1070855.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Crystallite size
    Photocatalysis
    Sol–gel process
    Titanium dioxide
    X-Ray Diffraction
    Zinc oxide
    drop casting
    energy gap
    thin films
    Opis:
    TiO2-ZnO thin films have been prepared by using drop casting technique. The optical, structural, and morphological properties of nanostructured TiO2-ZnO thin films deposited by drop casting technique was studied by using several experimental techniques were used to characterize optical, structural, and morphological properties; X-Ray Diffraction (XRD) was used to study the crystal structures, the crystallite size, the dislocation density, and the number of crystallites per unit area of TiO2-ZnO thin films. The surface topography, surface roughness parameters, and average grain size for all samples were done by Atomic Force Microscopy (AFM) micrograph which confirm the existence of Nano-structured thin films. The optical energy gap of the TiO2-ZnO thin films was determined by using UV spectroscopy. It was found that one type of basic electrons transitions, through which the values of the optical energy gap for all the prepared thin films which are allowed direct transition.
    Źródło:
    World Scientific News; 2019, 123; 87-101
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tlenek cynku – metoda oznaczania
    Zinc oxide – determination method
    Autorzy:
    Gawęda, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/138227.pdf
    Data publikacji:
    2009
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    tlenek cynku
    metoda oznaczania
    absorpcyjna spektrofotometria atomowa
    powietrze na stanowiskach pracy
    zinc oxide
    determination method
    atomic absorption spectrometry
    workplace air
    Opis:
    Metodę stosuje się do oznaczania tlenku cynku w powietrzu na stanowiskach pracy. Metoda polega na przepuszczeniu badanego powietrza przez filtr membranowy, mineralizacji próbki na gorąco z zastosowaniem stężonego kwasu azotowego i sporządzeniu roztworu do analizy w rozcieńczonym kwasie azotowym. Tlenek cynku oznacza się w tym roztworze jako cynk metodą płomieniową ab-sorpcyjnej spektrometrii atomowej. Oznaczalność metody wynosi 0,043 mg/m3 (dla objętości powietrza 720 l i krotności rozcieńczenia – 5).
    This method is based on stopping zinc oxide on a membrane filter, mineralizing the sample with concentrated nitric acid and preparing the solution for analysis. Zinc oxide is determined in the solution with flame atomic absorption spectrophotometry, as zinc. The determination limit of the method is 0.043 mg/m3.
    Źródło:
    Podstawy i Metody Oceny Środowiska Pracy; 2009, 1 (59); 175-180
    1231-868X
    Pojawia się w:
    Podstawy i Metody Oceny Środowiska Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Migration of Cadmium and Antimony from Zinc Oxide Emitted from a Sintering Machine in Zn and Pb Pyrometallurgical Process into Environment
    Możliwość migracji kadmu i antymonu z tlenku cynku pochodzącego z maszyny spiekalniczej pyrometalurgicznego otrzymywania Zn i Pb do środowiska
    Autorzy:
    Adamczyk, Zdzisław
    Nowińska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/1812067.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    pyrometallurgy
    zinc
    lead
    zinc oxide
    cadmium
    antimony
    Eh-pH diagrams
    ground-water environment
    pirometalurgia
    cynk
    ołów
    tlenek cynku
    kadm
    antymon
    diagramy Eh-pH
    środowisko gruntowo-wodne
    Opis:
    The pyrometallurgical process of production of zinc and lead realized in The Zinc Smelting Plant "Miasteczko Śląskie" S.A. poses a potential threat to the natural environment. Technologies applied in the process produce toxic pollutants, among which one of the most important is dust which contains Pb, Zn, Cd, As, Sb, Tl, etc. The detailed determination of chemical and mineral compositions of the dust allows to understand its behaviour in the environment and observe migration pathways. The paper presents results of investigations of the migration possibility to the soil and water environment of trace elements cadmium and antimony present in one of the main phases, zinc oxide, emitted with dusts from various operations of pyrometallurgical extraction of Zn and Pb at the Miasteczko Slaskie Zinc Smelting Plant, Poland. The quantity of elements was estimated on the basis of: (i) dust fall, (ii) zinc oxide content in dust, (iii) element content in zinc oxide, and (iv) mobility of zinc oxide under the hypergenic conditions of the soil and water environment of the Smelting Plant area. Among the elements considered, cadmium and antimony emitted with zinc oxide contained in dusts from the Sintering Machine will pose a potential hazard for the soil and water environment of the Miasteczko Slaskie Zinc Smelting Plant area.
    Proces pirometalurgicznego otrzymywania cynku i ołowiu metodą Imperial Smelting Process (ISP) stwarza potencjalne zagrożenie dla środowiska naturalnego. Proces technologiczny ISP jest źródłem toksycznych zanieczyszczeń, spośród których jednymi z najważniejszych są pyły zawierające w swym składzie między innymi takie pierwiastki jak Pb, Zn, Cd, As, Sb, Tl. Dokładne poznanie składu chemicznego i mineralnego zanieczyszczeń pyłowych pozwala na określenie ich zachowania się w środowisku, prześledzienie drogi migracji. W pracy przedstawiono wyniki badań możliwości migracji do środowiska gruntowo-wodnego pierwiastków śladowych występujących w jednej z głównych faz – siarczku cynku – emitowanej z pyłami pochodzącymi z różnych odcinków technologicznych pyrometalurgicznego otrzymywania Zn i Pb w Hucie Cynku Miasteczko Śląskie S.A., Polska. Ilość pierwiastków została oszacowana na podstawie: (i) opadu pyłu, (ii) udziału siarczku cynku w pyle, (iii) zawartości pierwiastka w siarczku cynku oraz (iii) mobilności siarczku cynku w warunkach hipergenicznych środowiska gruntowo-wodnego rejonu huty. Potencjalne zagrożenie dla środowiska gruntowo-wodnego rejonu Huty Cynku „Miasteczko Śląskie” S.A., spośród rozpatrywanych pierwiastków, będą stanowić kadm oraz antymon emitowane wraz z siarczkiem cynku zawartym w pyłach Maszyny Spiekalniczej
    Źródło:
    Rocznik Ochrona Środowiska; 2019, Tom 21, cz. 2; 1307-1317
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magazynowanie energii elektrycznej pochodzącej ze źródeł ekologicznych
    Energy storage from renewable sources
    Autorzy:
    Osuchowski, M.
    Witosławska, I.
    Perkowski, K.
    Witek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/392312.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    energia elektryczna
    magazynowanie energii
    źródło energii
    energia zielona
    tlenek cynku
    elektroliza
    electric energy
    energy storage
    energy source
    green energy
    zinc oxide
    electrolyze
    Opis:
    W artykule w dość zwięzły sposób opisano rozwiązanie technologiczne polegające na utworzeniu chemicznego magazynu energii przy elektrowniach wiatrowych. W magazynie ma być kumulowana energia pochodząca z elektrowni wiatrowych w przypadku dodatniego bilansu energetycznego, i oddawana w przypadku ujemnego bilansu. Energia ma być magazynowana poprzez elektrolizę roztworu tlenku cynku, natomiast odzyskiwana przez spalanie cynku w wysokotemperaturowym ogniwie cynkowym. Ogniwo cynkowe jest najprostszym ogniwem typu cynk/tlen pracującym w temperaturze 500–600°C (powyżej temperatury topnienia cynku). Szacowana sprawność kumulowania i odzyskiwania energii z takiego magazynu wynosi 60%.
    In the presented paper the chemical system of the energy storage for windmills farm, has been described at glance. Such a system should accumulate energy when the energy balance is positive and energy could be recovered when the energy deficiency occurs. In the proposed system the energy will be accumulate via chemical processes like electrolitical conversion of the zinc oxide to the metallic zinc as a storage process and zinc oxidation process in the high temperature fuel cells for recovery. The zinc fuel cell is the simplest cell working in the temperature 500–600oC over the zinc melting point. The calculated overall efficiency of such a system is about 60%.
    Źródło:
    Prace Instytutu Ceramiki i Materiałów Budowlanych; 2012, R. 5, nr 9, 9; 136-147
    1899-3230
    Pojawia się w:
    Prace Instytutu Ceramiki i Materiałów Budowlanych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morfologia i właściwości adsorpcyjne mezoporowatych węgli otrzymywanych metodą miękkiego odwzorowania z użyciem azotanu cynku oraz nanocząstek cynku i tlenku cynku
    Morphology and adsorption properties of mesoporous carbons obtained by soft-templating in the presence of zinc nitrate and nanoparticles of zinc and zinc oxide
    Autorzy:
    Choma, J.
    Jedynak, K.
    Marszewski, M.
    Jaroniec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/209403.pdf
    Data publikacji:
    2012
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mezoporowate węgle z nanocząstkami cynku i tlenku cynku
    struktura porowata
    adsorpcja azotu
    zdjęcia SEM
    mesoporous carbons with zinc nanoparticles and zinc oxide nanoparticles
    porous structure
    nitrogen adsorption
    SEM imaging
    Opis:
    Zsyntezowano metodą miękkiego odwzorowania mezoporowate, uporządkowane węgle w obecności różnych prekursorów zawierających cynk. Węgle te otrzymano wykorzystując rezorcynol i formaldehyd jako prekursory węglowe, oraz kopolimer trójblokowy Lutrol F127 EO101PO56EO101 jako miękką matrycę. Nanocząstki cynku o wymiarach ok. 50 nm i tlenku cynku o wymiarach ok. 100 nm oraz roztwór azotanu (V) cynku użyto jako źródło cynku. Ostatecznie kompozytowe materiały węglowo-cynkowe charakteryzowały się dużą powierzchnią właściwą (od 470 do 670 m²/g) oraz dużą objętością porów (od 0,33 do 0,56 cm³/g), w której udział objętości mezoporów wynosił od ok. 40% do ok. 80%. Funkcje rozkładu objętości porów wykazały obecność mikroporów o wymiarach ok. 2 nm i mezoporów o wymiarach ok. 7-8 nm. Zdjęcia SEM wskazywały na bardzo dobrze uporządkowaną warstwową morfologię kompozytów węglowo-cynkowych. Zdjęcia te także potwierdziły występowanie uporządkowanych, jednorodnych mezoporów, szczególnie w materiałach z tlenkiem cynku karbonizowanych w różnych temperaturach. Dobrze rozwinięta struktura porowata uporządkowanych kompozytów węglowych z nanocząstkami cynku lub tlenku cynku, w ilości 1-2% wag., a w przypadku metody impregnacji ok. 11% wag. ZnO, stwarza realną możliwość ich wykorzystania w procesach katalitycznych i adsorpcyjnych.
    Ordered mesoporous carbons were prepared by soft-templating in the presence of different precursors containing zinc. These carbons were obtained using resorcinol and formaldehyde as carbon precursors and triblock co-polymer Lutrol F127 EO101PO56EO101 as a soft template. Zinc nanoparticles with dimensions smaller than 50 nm, zinc oxide nanoparticles with dimensions smaller than 100 nm, and zinc nitrite solution were used as Zn precursors. The resulting carbon-zinc composite materials exhibited high specific surface areas (in the range of 470 to 670 m²/g) as well as large total pore volumes (in the range of 0.33 to 0.56 cm³/g), with the latter having the mesoporosity fraction between 40-80%. Based on the pore size distribution functions, the micropore width was estimated to be ca. 2 nm and the mesopore width was in the range of 7-8 nm. SEM images showed a layered structure of the obtained composites as well as proved a well-ordered structure of mesopores, which is particularly noticeable for the samples with zinc oxide nanoparticles carbonized at different temperatures. The well-developed structure of the ordered mesopores present in the synthesized composites loaded with nanoparticles of zinc or zinc oxide at 1-2 wt%, and in the case of the impregnated carbons at ca. 11 wt%, renders the obtained samples as feasible materials for catalytic and adsorption applications.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2012, 61, 4; 265-280
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of changes in electrical resistance of zinc oxide nanostructures under the influence of variable gaseous environments
    Autorzy:
    Procek, M.
    Pustelny, T.
    Stolarczyk, A.
    Maciak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/201073.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    ZnO
    flower-like nanostructures
    gas sensor
    wide gap semiconductors
    electric properties of semiconductors
    tlenek cynku
    kwiatopodobne nanostruktury
    czujnik gazu
    właściwości elektryczne półprzewodników
    Opis:
    The paper deals with the investigations concerning the influence of the changing gas environment on electrical resistance of zinc oxide (ZnO) nanostructures. The investigated structures are wide-gap semiconductors with the morphology of ZnO flower-shaped agglomerates of nanostructures. The resistance changes of these nanostructures were tested under the influence of various gases such as nitrogen dioxide (NO2), hydrogen (H2), ammonia (NH3) and also of humidity changes of carrier gases. To clarify the mechanisms of physicochemical processes in ZnO nanostructures during their interaction with gaseous environments, investigations were performed in two different carrier gases, viz. in synthetic air and in nitrogen. The study was carried out at a structure temperature of 200◦C.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 635-639
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The photoluminescent layers based on ZnO nanoparticles as radiation converters in photovoltaic applications
    Autorzy:
    Szczecińska, N.
    Znajdek, K.
    Sosna-Głębska, A.
    Lewicki, P.
    Czarnecki, P.
    Kraska, P.
    Bazdyga, C.
    Wiosna-Sałyga, G.
    Sibiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/105700.pdf
    Data publikacji:
    2018
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    down-conversion layers
    down-shifting layers
    photoluminescence nanoparticles
    solar cells efficiency
    zinc oxide nanoparticles
    photoluminescence layers
    nanocząstki fotoluminescencji
    efektywność ogniw słonecznych
    nanocząsteczki tlenku cynku
    warstwy fotoluminescencyjne
    Opis:
    The mismatch between solar cell response and solar spectrum is one of the biggest challenges to achieve high efficiency in photovoltaic cells. There are a few different approaches to minimise this concern. One of them is the radiation conversion which may be due to three different processes, namely up-conversion, down conversion and down-shifting. In this paper the down-conversion process of zinc oxide nanoparticles (ZnO NPs) and layers with ZnO NPs in polymer (poly (methyl methacrylate)) (PMMA) matrix will be analysed. ZnO NPs are prone to act as down-converting or down-shifting agents, which absorb the UV radiation, which is not absorbed by the solar cell, and then re-emit light in the visible range, which is suited to the photovoltaic cell sensitivity. Herein, the photoluminescence and optical transmittance of ZnO NPs and layers based on ZnO NPs will be presented. These parameters have a large influence on the potential application of these layers in photovoltaic structures for increased efficiency. The conversion layers have to fulfil the following conditions: have good optical transmittance in the visible range and high luminescence efficiency in converting UV radiation into visible. The paper focuses on finding the balance between these parameters.
    Źródło:
    Acta Innovations; 2018, 29; 16-26
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decolourization of tartrazine from aqueous solutions by coupling electrocoagulation with ZnO photocatalyst
    Autorzy:
    Modirshahla, N.
    Abdoli, M.
    Behnajady, M. A.
    Vahid, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/207693.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    zinc oxide
    coagulation
    decolourization
    electrocoagulation
    tartrazine
    C.I. Acid Yellow 23
    AY23
    colour removal
    color removal
    tlenek cynku
    koagulacja
    odbarwianie
    koagulacja za pomocą elektrolitu
    elektrokoagulacja
    tartrazyna
    żółcień spożywcza
    żółcień kwasowa 23
    barwniki azowe
    usuwanie koloru
    Opis:
    Decolourization of tartrazine (C.I. Acid Yellow 23, AY23) in aqueous solutions has been investigated by coupling electrocoagulation and ZnO photocatalyst methods and also by a comparison between ZnO, UV, EC, UV/ZnO, UV/EC, and EC/UV/ZnO systems in the removal of AY23 as a model contaminant. Results indicated that the decolourization efficiency was in order of EC/UV/ZnO > UV/EC > EC > UV/ZnO > ZnO > UV. Combining EC with UV/ZnO can trigger the Fenton or Fenton-like reaction, which accelerates the rate of decolourization. Desired operating conditions for decolourization of 40 mg·dm-3 AY23 solution in EC/UV/ZnO process were [ZnO] 0=650 mg·dm-3, [NaCl] = 800 mg·dm-3, light intensity = 31/2 W·m-2, current density = 120 A·m-2, electrodes distance = 15 mm, pH = 6.29, stirring rate = 900 rpm and electrodes of steel 304/A1, which yielded 99.70% colour removal in 5 min of treatment time.
    Źródło:
    Environment Protection Engineering; 2013, 39, 1; 59-73
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction of vanadium and potassium compounds from the spent vanadium catalyst from the metallurgical plant
    Autorzy:
    Mazurek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/779744.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kwas siarkowy
    tlenek siarki
    katalizatory wanadu
    ługowanie
    wanad
    potas
    miedź
    cynk
    arsen
    ołów
    XRF
    sulfuric acid
    sulfur oxide
    spend vanadium catalysts
    leaching
    recovery
    vanadium
    potassium
    copper
    zinc
    arsenic
    lead
    Opis:
    A spent vanadium catalyst, from the plant of metallurgical type, was leached in a sulfuric acid solution to recover vanadium and potassium compounds. The effect of time, temperature, concentration of acid, catalyst particle size and phase ratio was studied. Additionally the concentration of iron, copper, zinc, arsenic and lead compounds was determined. The flow sheet for the proposed process of spent vanadium catalyst leaching is presented.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 2; 49-53
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-68 z 68

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