Skocz do pozycji: 1.

Tytuł:

Magnetic resonance study of co-modified (Co,N)-TiO2 nanocomposites

Autorzy:

Guskos, N.
Zolnierkiewicz, G.
Guskos, A.
Typek, J.
Berczynski, P.
Dolat, D.
Mozia, S.
Aidinis, C.
Morawski, A. W.

Powiązania:

https://bibliotekanauki.pl/articles/146542.pdf

Data publikacji:

2015

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

nanocomposites
titanium dioxide
ferromagnetic resonance

Opis:

Three nCo,N-TiO2 nanocomposites (where cobalt concentration index n = 1, 5 and 10 wt %) were prepared and investigated by magnetic resonance spectroscopy at room temperature. Ferromagnetic resonance (FMR) lines of magnetic cobalt agglomerated nanoparticle were dominant in all registered spectra. The relaxation processes and magnetic anisotropy of the investigated spin system essentially depended on the concentration of cobalt ions. It is suggested that the samples contained two magnetic types of sublattices forming a strongly correlated spin system. It is suggested that the existence of strongly correlated magnetic system has an essential infl uence of the photocatalytic properties of the studied nanocomposites.

Źródło:

Nukleonika; 2015, 60, No. 3, part 1; 411-416
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 2.

Tytuł:

Mechaniczne i fizykochemiczne właściwości warstw TiO2
Mechanical and physicochemical properties of titanium dioxide thin films

Autorzy:

Krzak-Roś, J.
Grygier, D.
Baszczuk, A.
Będziński, R.

Powiązania:

https://bibliotekanauki.pl/articles/284866.pdf

Data publikacji:

2007

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

ditlenek tytanu
implanty
implants
titanium dioxide

Źródło:

Engineering of Biomaterials; 2007, 10, no. 67-68; 35-37
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 3.

Tytuł:

Simultaneous photooxidation and photoreduction of phenol and Cr(VI) ions using titania modified with nanosilica

Autorzy:

Kądziołka, Daria
Grzechulska-Damszel, Joanna
Schmidt, Beata

Powiązania:

https://bibliotekanauki.pl/articles/2174823.pdf

Data publikacji:

2022

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

photocatalysis
titanium dioxide
nanosilica
water purification

Opis:

The photocatalytic process of phenol oxidation and Cr(VI) reduction in the presence of nano-silica modified titania was carried out. The activity of composites was tested using two different light sources. The photocatalysts with 10% of nanosilica showed the highest activity. The calcination temperature (200–800 °C) significantly determined the sensitivity of the obtained materials to the light source used. Photocatalysts alternately adsorbed and desorbed Cr(VI) ions from the reaction mixture during irradiation. In the one-component mixture, complete oxidation of phenol was observed using material calcined at 650 °C, after 3 h of UV-VIS irradiation. In the reaction mixture of Cr(VI) and phenol, the highest activity was demonstrated by photocatalyst calcined at 300 °C. The concentration of phenol decreased in proportion to the decrease of chromium ions. The obtained titania-silica composites showed oxidizing properties towards phenol and reductive properties toward Cr(VI) ions.

Źródło:

Polish Journal of Chemical Technology; 2022, 24, 4; 23--29
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 4.

Tytuł:

Influence of Polarization Processes on the Morphology and Photoluminescence Properties of PP/TiO₂ Polymer Nanocomposites

Autorzy:

Ramazanov, M.
Hajiyeva, F.
Maharramov, A.
Hasanova, U.
Ahmadova, A.
Rahimli, A.
Shirinova, H.

Powiązania:

https://bibliotekanauki.pl/articles/1032328.pdf

Data publikacji:

2017-06

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

photoluminescence
corona discharge
nanocomposites
polypropylene
titanium dioxide

Opis:

The paper reports of synthesis and investigation of polymeric nanocomposites based on isotactic polypropylene and titanium dioxide nanoparticles PP+TiO₂ (PPT). The structure of the PPT nanocomposites was studied by scanning electron and atomic force microscopy. There was also studied the influence of the polarization process by corona discharge on the structure and photoluminescence properties of PPT nanocomposites. It was found that intensity of the photoluminescence after the polarization increases, and this depends on the concentration of titan dioxide nanoparticles in the polymer matrix. It was shown that rms roughness for non-polarized sample compositions is 60-100 nm, whereas for polarized samples after the corona discharge polarization, makes 20-40 nm, i.e. there takes place grinding of the structural elements. It is supposed that, in the composite there forms sufficiently high internal local field, due to the boundary charges, so under the influence of this field there were excited additional luminescent centers, and as a result, after the polarization there was observed the increase of luminescence intensity.

Źródło:

Acta Physica Polonica A; 2017, 131, 6; 1540-1543
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 5.

Tytuł:

Correlation between growth mechanisms and the influence of process control parameters on physical properties of titanium dioxide nanotubes in electrochemical anodisation

Autorzy:

Kioko, S.
Khanna, K. M.
Österlund, L.

Powiązania:

https://bibliotekanauki.pl/articles/1193444.pdf

Data publikacji:

2021

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Anodization
High field
Nanotubes
Titanium dioxide
Tunneling

Opis:

The growth of thin oxide films has been covered by several theories and models. The high electrical field model, Fowler-Nordheim tunneling in Metal Oxide films and Schottyky barrier Mechanisms are models which explain metal oxide formation. The growth mechanisms and process control parameters during thin film growth in electrochemical anodization play a key role in the growth process. This work explores how the growth mechanisms correlate with process control parameters to influence the growth process in electrochemical anodization of titanium dioxide nanotubes (TNTs). The theories on growth mechanism have been explained in detail. On the experimental part, TiO2 nanotubes were synthesized for photocatalytic activity using electrochemical anodization in a third generation electrolyte. The electrolyte comprised of a mixture of ethylene glycol and ammonium fluoride in little amount of water. Anodizing time and electrode separation distance were explored as process control parameters. The TNTs were analysed using SEM, XRD, Profilometer and UV-Visible spectrophotometer. Short electrode separation distance recorded fast growth, non-uniformity in TNTS, disorganisation, distortion and etching of TNTs. The TNT length, inner and outer diameters reduced with increasing electrode separation distance due to reduction of electric field, increased bulk resistance. There was no significant increase in TNT dimensions at electrode separation distance of 4.5 cm which also recorded the smallest grain size for the TNTs highest degree of crystallinity for with absorption maxima at 550 nm. TNT length, inner and outer diameters and crystallinity increased with anodising time.

Źródło:

World Scientific News; 2021, 157; 80-104
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 6.

Tytuł:

The optical parameters of TiO2 antireflection coating prepared by atomic layer deposition method for photovoltaic application

Autorzy:

Szindler, Marek
Szindler, Magdalena M.

Powiązania:

https://bibliotekanauki.pl/articles/1835965.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

thin film
atomic layer deposition
titanium dioxide

Opis:

Titanium dioxide thin films have been deposited on silicon wafers substrates by an atomic layer deposition (ALD) method. There optical parameters were investigated by spectroscopic ellipsometry and UV/VIS spectroscopy. A material with a refractive index of 2.41 was obtained. Additionally, in a wide spectral range it was possible to reduce the reflection from the silicon surface below 5%. The Raman spectroscopy method was used for structural characterization of anatase TiO2 thin films. Their uniformity and chemical composition are confirmed by a scanning electron microscope (SEM) energy dispersive spectrometer (EDS).

Źródło:

Optica Applicata; 2020, 50, 4; 663-670
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 7.

Tytuł:

Artificial skin composites

Autorzy:

Ładniak, Agata

Powiązania:

https://bibliotekanauki.pl/articles/2079951.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

titanium dioxide,
chitosan
hyaluronic acid
skin substitutes

Opis:

Skin injuries are a health problem and can lead to serious, significant deterioration in the quality of life and, consequently, even illness and disability. Therefore, after wounding, immediate regeneration of the tissue is necessary to avoid further complications and pathogenesis. Consequently, many wound healing strategies have been developed, leading to the progress in constructing of multifunctional tissue substitutes for the skin, biomembranes, scaffolds and intelligent dressings. The field of science focusing on the creation of the above-mentioned products is tissue engineering (TE). Its main goal is to find a system that is able to replace or be a model that perfectly mimics the form and function of the skin. Research carried out on such constructs is mainly based on the analysis of mechanical properties (porosity, elasticity), as well as the assessment of the impact of individual components on processes related to the formation of new tissue as cell proliferation and differentiation, proliferation, angiogenesis - through in vivo studies (using animal models: mice, New Zealand rabbits) and in vitro (most often using mouse fibroblasts - L929). Skin constructions may have potential applications as wound dressings or skin substitutes in cases of severe skin damage.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 51-60
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 8.

Tytuł:

Degradation of sertraline in water by suspended and supported TiO2

Autorzy:

Rejek, M.
Grzechulska-Damszel, J.

Powiązania:

https://bibliotekanauki.pl/articles/780043.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

photocatalysis
titanium dioxide
pharmaceuticals
sertraline
water treatment

Opis:

Pharmaceutical pollutants have been detected in many countries in surface and ground water after treatment in wastewater treatment plants. The presented studies concern the photocatalytic removal of one of SSRI antidepressants - sertraline from water using TiO₂  photocatalyst. The process was conducted using two laboratory installations with periodic and flow reactors. Two forms of TiO₂  was used in the photocatalytic reactions: suspended and supported onto a glass fabric. The studies shown that with increasing initial concentration of pharmaceutical, photoactivity decreases. For the initial concentration of 0.025 g/dm³ , the best results – 94% removal – was achieved for the process conducted in the periodic reactor with TiO₂  supported onto a glass fabric.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 2; 107-112
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 9.

Tytuł:

Behaviour of tio2/chitosan dispersion as a function of solution ph

Autorzy:

Gozdecka, Agata
Wiącek, Agnieszka E.

Powiązania:

https://bibliotekanauki.pl/articles/1034623.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

adsorption
chitosan
pH
targeted therapy
titanium dioxide

Opis:

This paper presents the physico-chemical characteristics of titanium dioxide/chitosan dispersion. The surface and electrostatic properties of TiO2 particles in the electrolyte solution (NaCl) and in the presence of a biopolymer were determined by static and dynamic light scattering. The stability measurements were made under different conditions, where the variable was the dispersion pH. This paper mainly includes discussion of dispersion behaviour in neutral and alkaline environments. At each pH value (6–9), the addition of chitosan caused significant improvement in stability compared to the systems of base titanium dioxide. Of the tested systems, the most stable values of diameter and zeta potential for dispersion were found at pH 7. The study allowed the conclusion that the addition of chitosan to TiO2 dispersion created the possibility of using such systems as a drug carrier for the controlled release of active substances sensitive to pH changes.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 27-41
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 10.

Tytuł:

Experimental Analysis of Titanium Dioxide Synthesis from Synthetic Rutile Waste using a Moderate Acid Concentration and Temperature

Autorzy:

Ahmad Mukifza, H.
Awang, H.
Yusof, S.
Farid, E.

Powiązania:

https://bibliotekanauki.pl/articles/1031724.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

synthetic rutile
titanium dioxide
caustic hydrothermal
sodium titanate

Opis:

The present study is to clarify the present influences of acid concentration and temperature of caustic hydrothermal method on extracting the titanium dioxide (TiO₂) from synthetic rutile waste. In this experimental work, the caustic hydrothermal method comprises two processes: a decomposition and the sulphate process. The extracted titanium is characterized by using a electron dispersive X-ray spectroscopy to specify its chemical composition, field emission scanning electron microscope to determine the morphology and particle size, and lastly it is the X-ray diffraction to analyse the crystallinity of extracted titanium. In this study, we found that both acid concentration and temperature affected the TiO₂ growth while the calcination process could improve the crystallinity of extracted titanium.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 833-835
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 11.

Tytuł:

The effect of titanium dioxide addition on physical and biological properties of Na2O-B2O3-P2O5 and CaO-Na2O-P2O5 glasses

Autorzy:

Kalwasińska, O.
Gajc, M.
Kłos, A.
Orliński, K.
Pawlak, D. A.
Krok-Borkowicz, M.
Rumian, Ł.
Pietryga, K.
Reczyńska, K.
Pamuła, E.

Powiązania:

https://bibliotekanauki.pl/articles/285502.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

phosphate glasses
bioactive glasses
titanium dioxide
tissue engineering

Opis:

Two types of phosphate glasses 50Na2O-20B2O3-30P2O5 (NBP) and 30CaO-20Na2O-50P2O5 (CNP) with different content of TiO2 (0, 3 and 5 mol%) have been prepared by melt-quenching process. TiO2 was added to increase glass network stability. Physical properties of glasses were investigated by density measurements, differential scanning calorimetry and degradation in phosphate buffered saline (PBS). Biological performance of glasses in a direct contact with osteoblast-like MG-63 cells was analysed with the use of resazurin test and live-dead staining. The results show that TiO2 addition increased density, glass transition temperature (Tg) and melting temperature (Tm) of both types of glasses. In the case of NBP glasses presence of TiO2 resulted in their fast degradation in PBS and acidification of cell culture medium. As a consequence such glasses did not support cell adhesion and growth, but they can be considered for e.g. drug delivery systems. On the other hand addition of TiO2 to CNP glasses resulted in enhanced cell adhesion and viability. Particularly positive results were found for CNP glass containing 5% TiO2, so it can be a good candidate as a scaffold material for bone tissue engineering.

Źródło:

Engineering of Biomaterials; 2016, 19, 134; 2-7
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 12.

Tytuł:

The influence of sulfur addition on the hazard-type reaction of ilmenite ores with sulfuric acid

Autorzy:

Jabłoński, Maciej
Lubkowski, Krzysztof
Tylutka, Sandra
Ściążko, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1849314.pdf

Data publikacji:

2021

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

hazard-type reaction
ilmenite
titanium dioxide pigment
sulfur

Opis:

The paper presents results of thermokinetic investigation of the hazard-type reaction of Norwegian and Australian ilmenite ores with sulfuric acid, modified by the addition of elemental sulfur, to increase the process safety in industrial conditions. In the reactions of both ilmenite ores the addition of sulfur caused a reduction of the thermal power generated in the reaction and a decrease in the value of the thermokinetic parameter ΔTmax/Δτ for almost the whole range of initial concentrations of sulfuric acid. It was also found that the addition of sulfur to the reaction did not negatively affect the degree of ilmenite leaching. The interpretation of the obtained thermokinetic curves allowed to determine safe process conditions for both types of titanium raw materials.

Źródło:

Polish Journal of Chemical Technology; 2021, 23, 3; 17-23
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 13.

Tytuł:

The influence of sulfur addition on the hazard-type reaction of ilmenite ores with sulfuric acid

Autorzy:

Jabłoński, Maciej
Lubkowski, Krzysztof
Tylutka, Sandra
Ściążko, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/1849319.pdf

Data publikacji:

2021

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

hazard-type reaction
ilmenite
titanium dioxide pigment
sulfur

Opis:

The paper presents results of thermokinetic investigation of the hazard-type reaction of Norwegian and Australian ilmenite ores with sulfuric acid, modified by the addition of elemental sulfur, to increase the process safety in industrial conditions. In the reactions of both ilmenite ores the addition of sulfur caused a reduction of the thermal power generated in the reaction and a decrease in the value of the thermokinetic parameter ΔTmax/Δτ for almost the whole range of initial concentrations of sulfuric acid. It was also found that the addition of sulfur to the reaction did not negatively affect the degree of ilmenite leaching. The interpretation of the obtained thermokinetic curves allowed to determine safe process conditions for both types of titanium raw materials.

Źródło:

Polish Journal of Chemical Technology; 2021, 23, 3; 17-23
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 14.

Tytuł:

Modyfication of photocatalytic properties of titanium dioxide by mechanochemical method

Autorzy:

Dulian, P.
Buras, M.
Żukowski, W.

Powiązania:

https://bibliotekanauki.pl/articles/778307.pdf

Data publikacji:

2016

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

mechanochemistry
high-energy ball milling
titanium dioxide
photocatalysis

Opis:

The paper presents a simple way to improve the photocatalytic properties of titanium dioxide using mechanochemical method. The TiO₂ (Anatase) powders was subjected to high-energy ball milling in dry environment and in methanol. It has been shown that it is possible to induce the phase transformation from Anatase to Rutile and produce a material with a higher photocatalytic activity in the UV light. Physicochemical characteristics of the products were based on the following methods and techniques: X-ray powder diffraction (XRD), IR and UV-Vis (DR) spectroscopy, measurements of specific surface area (BET). The photocatalytic activity of the powders was measured in the decomposition reaction of methyl orange in water.

Źródło:

Polish Journal of Chemical Technology; 2016, 18, 3; 68-71
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 15.

Tytuł:

Structural and photocatalytic properties of Ni-TiO2 photocatalysts prepared by mechanochemical synthesis assisted with calcination

Autorzy:

Kucio, Karolina
Charmas, Barbara
Zięzio, Magdalena
Pasieczna-Patkowska, Sylwia

Powiązania:

https://bibliotekanauki.pl/articles/2146911.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

mechanochemical synthesis
titanium dioxide
photocatalysis
photocatalysts
safranin T

Opis:

In the study the mechanochemical synthesis in the planetary ball mill was used to prepare photocatalytic materials obtained on the basis of TiO2 and nickel(II) acetylacetonate as a Ni2+ source. Three materials with different contents of Ni2+: 5, 10 and 20% wt. were prepared. The obtained materials were calcinated at 800°C for 1 h. Their physicochemical properties were investigated using the N2 adsorption/desorption, FT-IR/PAS, XRD, UV-Vis/DRS and SEM methods. Additionally, thermal stability of the obtained materials was examined (TGA/DTG/DTA). Photocatalytic activity of the samples was tested in relation to the aqueous solution of Safranin T (initial concentration C0 = 1×10-5 mol L-1) at the visible light (Vis). The results indicate that the mechanochemical synthesis is an effective and simple method for preparing materials with photocatalytic properties. All obtained materials were characterized by greater photocatalytic activity compared to the initial TiO2.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150348
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 16.

Tytuł:

Ammonia level sensor using tapered optical fiber coated with titanium dioxide-incorporated porphyrin

Autorzy:

Parasuti, Frazna
Hikmawati, Dyah
Trilaksana, Herri
Yasin, Moh.

Powiązania:

https://bibliotekanauki.pl/articles/27310105.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ammonia sensing
tapered optical fibre
titanium dioxide
porphyrin

Opis:

Since ammonia is water-soluble, environmental studies have shown that the industrial waste such as fertilizer manufacturing, food products, palm oil, urea fertilizer industry can cause very serious damage to water body ecosystems if not properly managed, resulting in a decrease in water quality. Devices based on optical technology, especially devices that combine optical fibers and nanomaterials, are identified as highly sensitive to the species of interest by detecting changes in physicochemical properties. A practical, easy-to-use, inexpensive instrument for detecting ammonia level was proposed using tapered optical fiber (TOF) coated with titanium dioxide-incorporated porphyrin. TOF was fabricated by simultaneously stretching and heating. The preparation of TiO2/porphyrin/gelatine was prepared to coat tapered optical fiber by dipping. SEM analysis shows an increase in length and a decrease in diameter, also the successful coating of titanium dioxide and porphyrin in the taper region. The EDX analysis also proves the presence of the Ti element in the TOF layer. The TOF produces significant sensing performances toward the ammonia liquid concentration level. The TOF coated with titanium dioxide-incorporated porphyrin can detect a one ppm difference in ammonia concentration with a certain range of output voltage for every concentration has.

Źródło:

Optica Applicata; 2023, 53, 3; 353--361
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 17.

Tytuł:

Effect of chitosan, hyaluronic acid and/or titanium dioxide on the physicochemical characteristic of phospholipid film/glass surface

Autorzy:

Ładniak, Agata
Jurak, Małgorzata
Wiącek, Agnieszka Ewa

Powiązania:

https://bibliotekanauki.pl/articles/109601.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

chitosan
titanium dioxide
hyaluronic acid
phospholipid
adhesion
topography

Opis:

The production of preparations, whose destination action takes place in close proximity to living cells, increases the necessity to carry out studies concerning the determination of the biomaterial surface effect on the cellular response. In achieving this goal, physicochemical characteristic of the surface can be helpful. This can be established based on topography, chemical composition, wettability, and surface energy analysis. In addition, determining the changes of these properties which can occur as a result of surface modification will allow prediction of cell behaviour when contacting with biomaterial. In the study, the Langmuir-Blodgett technique was used. It enabled the transfer of the Langmuir monolayer formed from 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) to a solid support. The DPPC film imitated a natural biological membrane capable of interacting with the components of the liquid subphase: chitosan (Ch), hyaluronic acid (HA) and/or titanium dioxide (TiO₂). Depending on the type and strength of interactions of phospholipid molecules with the components of the subphase, the films obtained on the solid support were characterized by specific surface properties. Their characteristics based mainly on values of the work of adhesion in connection with films topography, allowed for statement that it is possible to form semi-interpenetrating Ch network in which HA is entrapped, contributing to the enhanced adhesion of the DPPC film, additionally intensified by TiO₂ inclusion. This type of research permit for better understanding of the interactions at the interface, cell membrane-Ch/HA/TiO₂ and can be important in the creation of a new generation of skin or tissue substitutes.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1535-1548
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 18.

Tytuł:

Kinetics of sulphuric acid leaching of titanium from refractory anatase under atmospheric pressure

Autorzy:

Gao, Likun
Rao, Bing
Dai, Huixin
Xie, Haiyun
Wang, Peng
Ma, Fangtong

Powiązania:

https://bibliotekanauki.pl/articles/109701.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

anatase ore
kinetics
sulphuric acid
leaching
titanium dioxide

Opis:

Anatase, as an important titanium resource, is attracting more and more attention in research and application. In this study, an efficient process of comprehensively extracting the titanium and other valuable elements from the anatase mineral was proposed. The effect of particle size, stirring speed, initial sulphuric acid concentration, solid-to-liquid ratio, and reaction temperature on the leaching rate of titanium from anatase was investigated. Under appropriate two-stage countercurrent leaching conditions, with the first stage of the liquid-to-solid ratio of 1/3 g/cm3, reaction temperature of 120 °C, initial acid concentration of 11 mol/dm3, residence time of 30 min, stirring speed of 200 rpm, and the second stage of the liquid-to-solid ratio of 1/3 g/cm3, reaction temperature of 200 °C, initial acid concentration of 13 mol/dm3, residence time of 30 min, and stirring speed of 200 rpm, over 99% TiO2, 99% Al2O3, and 97% Sc2O3 were extracted respectively with quartz still remained in the residue. X-ray diffraction, X-ray fluorescence spectrometer, and scanning electron microscopy/energy-dispersive spectroscopy were used to characterize the anatase samples before and after the leaching. Additionally, the leaching kinetics analysis indicated that both acid concentration and temperature were the most significant parameters for the leaching process. And, the titanium leaching reaction rate was controlled by the diffusion of reactants through the residual layer.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 2; 467-478
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 19.

Tytuł:

Solar cells based on copper oxide and titanium dioxide prepared by reactive direct-current magnetron sputtering

Autorzy:

Wisz, Grzegorz
Sawicka-Chudy, Paulina
Sibiński, Maciej
Starowicz, Zbigniew
Płoch, Dariusz
Góral, A.
Bester, Mariusz
Cholewa, M.
Woźny, Janusz
Sosna-Głębska, A.

Powiązania:

https://bibliotekanauki.pl/articles/1818195.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich

Tematy:

solar cells
copper oxide
titanium dioxide
reactive magnetron sputtering

Opis:

In this study, solar cells based on copper oxide and titanium dioxide were successfully manufactured using the reactive direct-current magnetron sputtering (DC-MS) technique with similar process parameters. TiO₂/CuO, TiO₂/Cu₂O/CuO/Cu₂O, and TiO₂/Cu₂O solar cells were manufactured via this process. Values of short-circuit current efficiencies, short-circuit current density, open-circuit voltage, and maximum power of PV devices were investigated in the range of 0.02÷0.9%, 75÷350 µA, 75÷350 µA/cm², 16÷550 mV, and 0.6÷27 µW, respectively. The authors compare solar cells reaching the best and the worst conversion efficiency results. Thus, only the two selected solar cells were fully characterized using I-V characteristics, scanning electron microscopy, X-ray diffraction, ellipsometry, Hall effect measurements, and quantum efficiency. The best conversion efficiency of a solar cell presented in this work is about three times higher in comparison with the authors’ previous PV devices.

Źródło:

Opto-Electronics Review; 2021, 29, 3; 97--104
1230-3402

Pojawia się w:

Opto-Electronics Review

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 20.

Tytuł:

aaSolar cells based on copper oxide and titanium dioxide prepared by reactive direct-current magnetron sputtering

Autorzy:

Wisz, G.
Sawicka-Chudy, P.
Sibiński, M.
Starowicz, Z.
Płoch, D.
Góral, A.
Bester, M.
Cholewa, M.
Woźny, J.
Sosna-Głębska, A.

Powiązania:

https://bibliotekanauki.pl/articles/1818199.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich

Tematy:

solar cells
copper oxide
titanium dioxide
reactive magnetron sputtering

Opis:

In this study, solar cells based on copper oxide and titanium dioxide were successfully manufactured using the reactive direct-current magnetron sputtering (DC-MS) technique with similar process parameters. TiO₂/CuO, TiO₂/Cu₂O/CuO/Cu₂O, and TiO₂/Cu₂O solar cells were manufactured via this process. Values of short-circuit current efficiencies, short-circuit current density, open-circuit voltage, and maximum power of PV devices were investigated in the range of 0.02÷0.9%, 75÷350 µA, 75÷350 µA/cm², 16÷550 mV, and 0.6÷27 µW, respectively. The authors compare solar cells reaching the best and the worst conversion efficiency results. Thus, only the two selected solar cells were fully characterized using I-V characteristics, scanning electron microscopy, X-ray diffraction, ellipsometry, Hall effect measurements, and quantum efficiency. The best conversion efficiency of a solar cell presented in this work is about three times higher in comparison with the authors’ previous PV devices.

Źródło:

Opto-Electronics Review; 2021, 29, 3; 97--104
1230-3402

Pojawia się w:

Opto-Electronics Review

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 21.

Tytuł:

Wheat seedlings traits as affected by soaking at titanium dioxide nanoparticles

Autorzy:

Shafea, A.A.
Dawood, M.F.
Zidan, M.A.

Powiązania:

https://bibliotekanauki.pl/articles/10003.pdf

Data publikacji:

2017

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

wheat
seedling
germination
seed potential
soaking
titanium dioxide
nanoparticle

Opis:

The recent advances in nanotechnology and its use in the field of agriculture are astonishingly increasing; therefore, it is important to understand their role in plant life. Four wheat cultivars soaked in different concentrations of TiO2-NPs (0.0%, 0.025 %, 0.05 %, 0.1 %, 0.2 % and 0.5 %) to select a concentration that stimulate cultivars growth under normal conditions during germination stage. Cultivar dependency appeared markedly in their response to TiO2-NPs. Generally, TiO2-NPs did not modify germination percentage, despite 0.1 % TiO2-NPs vastly enhanced seed potential by increasing vigor index, root dry matter stress tolerance index, shoot dry matter stress tolerance index, dry matter stress tolerance index, plant height stress tolerance index, root length stress tolerance index, fresh matter stress tolerance index and pigment composition. The surrounding concentrations exert little effect on the studied parameters and 0.5 % TiO2-NPs suppressed all indices.

Źródło:

Environment, Earth and Ecology; 2017, 1, 1
2543-9774
2451-4225

Pojawia się w:

Environment, Earth and Ecology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 22.

Tytuł:

Modified titanium dioxide for 3D printing applications

Autorzy:

Sztorch, Bogna
Głowacka, Julia
Hanuszewska, Anna
Romańczuk-Ruszuk, Eliza
Konieczna, Roksana
Przekop, Robert

Powiązania:

https://bibliotekanauki.pl/chapters/2204277.pdf

Data publikacji:

2022

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

biocomposites
PLA
titanium dioxide
pigments
organosilicon modifiers
functional nanocomposites

Opis:

This chapter describes the methodology of obtaining polylactide (PLA) biocomposites with the TiO2 modified by organosilicon compounds: disiloxane and functionalized octaspherosilicate designed for use in additive technologies. The paper presents general information about polylactide, titanium dioxide and the used organosilicon modifiers (silsesqioxanes and polysiloxanes). In the paper the authors compare the effect of two types of TiO2 from different manufacturers on the properties of polymer biocomposites, which can be used in biomedical applications. The properties of the obtained composites with the use of additive FDM technology were characterized mechanically (tensile strength, flexural strength, impact strength), and the particle size of the TiO2 pigment nanofillers used was measured. All the composites were pretreated using a plastic processing technique with two different mass ratios of TiO2 filler content (1.5%; 0.5%). The properties of PLA/TiO2 composites depend on the filler concentration. The applied fillers had a positive effect on the improvement of the mechanical properties of the produced polymer composites. This effect was additionally intensified by the introduction of organosilicon modifiers.

Źródło:

Advances in biomedical engineering; 165–179
9788367185400

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 23.

Tytuł:

Nanocrystalline TiO2 Powder Prepared by Sol-Gel Method for Dye-Sensitized Solar Cells

Autorzy:

Dobrzański, L. A.
Szindler, M. M.
Szindler, M.
Lukaszkowicz, K.
Drygała, A.
Prokopiuk vel Prokopowicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/353118.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sol-gel
nanopowder
titanium dioxide
dye-sensitized solar cell

Opis:

In this study titanium dioxide nanopowder has been manufactured and examined. Nanocrystalline TiO₂ powder has been obtained by hydrolysis and peptization of a solution of titanium isopropoxide and isopropanol. Subsequently, produced powder has been subjected to structural analysis by using a transmission electron microscope, X-ray diffractometer, and Raman spectrometer. For comparison purposes, a commercially available titanium dioxide powder (i.e. titanium white) was also used. Thin layers have been made from this powder and further have been examined by using a UV/VIS spectrometer. Completed research shows the nanocrystalline structure of obtained layers and their good properties such as absorbance at the range of wavelength equal 200 - 1000 nm.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 833-836
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 24.

Tytuł:

Novel (Ag,Y) doped TiO2 plasmonic photocatalyst with enhanced photocatalytic activity under visible light

Autorzy:

Kallel, Wannes
Chaabene, Sirine
Bouattour, Soraa

Powiązania:

https://bibliotekanauki.pl/articles/110853.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

titanium dioxide
XRD
plasmonic photocatalyst
Methylene Blue
visible light

Opis:

Nano-sized Y- Ag doped and co-doped TiO2 particles were synthesized using the sol–gel method and Ti(OBu)4 as TiO2 precursor. Their structural and optical properties were examined by scanning electron microscopy (SEM), XRD, thermogravimetric-differential thermal analysis (TG-DTA), FT-IR and UV-vis absorption spectroscopies. The photocatalytic activity of these materials was investigated for the photodegradation of methylene blue (MB) as a model reaction under visible light irradiation. Ground state diffuse reflectance absorption studies reveal that both Y and Ag dopant cause deviations of the band gap to higher energies attesting that co-doping the TiO2 with Y and Ag could enhance the photocatalytic activity by delaying the electron–hole recombination by means of higher energy band gaps. Co-doping TiO2 at a level of 4% (Y, Ag) samples leads to a significant decrease in the crystallite size of photocatalyst and containing both anatase and Ag/AgCl components. However, the high photocatalytic performance is attributed to an efficient electron-hole pairs separation at the photocatalyst interfaces in addition to localized surface plasmon resonance of Ag particles. The development of these visible light- activated nanocatalysts has the potential of providing environmentally benign routes for water treatment.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 3; 745-759
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 25.

Tytuł:

The removal of Fe from the reduced ilmenite via aeration leaching assessing the effect of operating parameters

Autorzy:

Ibrahim, Siti Asmidar
Yunus, Farhana
Ariffin, Kamar Shah
Sheikh Abdul Hamid, Sheikh Abdul Rezan
Ismail, Suhaina
Jabit, Nurul Ain

Powiązania:

https://bibliotekanauki.pl/articles/2146865.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ilmenite
reduced ilmenite
aeration leaching
synthetic rutile
titanium dioxide

Opis:

An upgrade of Malaysian ilmenite (FeTiO3) concentrate to synthetic rutile (TiO2) using aeration leaching was investigated in this study. Carbothermal reduction using Sarawak MukahBalingan coal and compressed National Gas (CNG) as a reductant was used to produce reduced ilmenite (RI) as an intermediate phase consisting of titanium oxide matrix with metallic iron prior to aeration leaching. Metallic iron was dissolved in ammonium chloride solution after the reduction process, separating synthetic rutile in the leaching residue. This study aims to evaluate the leaching parameters, such as concentration, temperature, and leaching time. The optimum conditions established by the design of the experiment (DOE) and the analysis of variance (ANOVA) has indicated that leaching temperature was the most significant parameter for iron dissolution. It was found that iron dissolution at a maximum value of 97.0% was achieved at an optimum condition of 0.5 M NH4Cl at 90°C for 7 hours. With an initial weight of 46 wt.%TiO2 and 37 wt.% Fe2O3, ilmenite was successfully upgraded to 80 wt.% and 8 wt.%, respectively. In conclusion, Malaysian ilmenite has a high potential value to be upgraded to synthetic rutile by aeration leaching with ammonium chloride via Becher process.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 6; 182--195
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 26.

Tytuł:

Thermal stability of chitosan nanocomposites containing tio2 and organo-modified montmorillonite

Autorzy:

Książek, Sylwia
Mucha, Maria

Powiązania:

https://bibliotekanauki.pl/articles/1034832.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

chitosan
organo-modified montmorillonite
thermal degradation
titanium dioxide nanoparticles

Opis:

The aim of this work was to investigate the effect of different nanoparticles (TiO2 and organically modified montmorillonite MMT) on thermal stability of chitosan thin films (obtained by casting) and to compare with previously studied- CuO and Ag effect. Thermal degradation was carried out in air atmosphere at 140°C up to 100 hours. Various functional groups of chitosan have a different susceptibility to degradation. The influence of nanoparticles amount on degradation of selected structural groups of chitosan was calculated. It was proved, that elongation at break of chitosan sample and its nanocomposites with TiO2 and organically modified montmorillonite decrease rapidly after 20h of thermal degradation. Moreover, as is clear from FTIR studies, that TiO2 nanoparticles enhance the resistant of the -C-O-C- bond responsible for chain scission of chitosan due to thermal degradation. An opposite effect is observed in a case of MMT, where the chain scission of -C-O-C- bond is higher than for pure chitosan. Another effect of nanoparticles are observed in destruction of unstable amine group (-NH3 band at 1560 cm-1) and formation of the amide group (band at 1650 cm-1). In this case both nanoadditives accelerate the decomposition of amine group and the formation of amide group in higher extent in comparison to pure chitosan.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 122-129
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 27.

Tytuł:

Effect of sunlight and ultraviolet radiation on the efficacy of Fe-doped titanium dioxide (Fe-TiO2) nanoparticles for the removal of furfural from aqueous solutions

Autorzy:

Veisi, F.
Zazouli, M. A.
Zadeh, M. A. E.
Charati, J. Y.
Dezfuli, A. S.

Powiązania:

https://bibliotekanauki.pl/articles/207273.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

chromatography
titanium dioxide
ultraviolet radiation
chromatografia
dwutlenek tytanu
promieniowanie ultrafioletowe

Opis:

Furfural, chemical compound very harmful to human health and difficult to degrade, is used or generated in many industries, including petrochemical, paper, and oil refining industries. The study evaluates the performance of Fe-TiCh nanoparticles for the removal of furfural in the presence of sunlight and UV radiation. Fe-TiO₂ nanoparticles were prepared by the sol-gel method, and the characteristics of the resultant nanoparticles were determined using scanning electron microscopy. Samples with known concentrations of furfural and nanoparticles were individually exposed to sunlight and UV radiation under varying conditions, and the residual furfural concentration was measured using high- performance liquid chromatography. The results showed that for both processes the efficiency of furfural removal increased with increased reaction time, nanoparticle loading, and pH, whereas the efficiency decreased with increased furfural concentratioa The highest removal efficiencies of the Fe-TiCh/UV and Fe-TiCh/sun processes were 95 and 76%, respectively. In general, the degradation and elimination rate of furfural using Fe-TiO₂/UV process was higher than Fe-TiCVsun process because TiO₂ nanoparticles can only be activated upon irradiation with photons of light in the UV domain.

Źródło:

Environment Protection Engineering; 2017, 43, 3; 207-224
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 28.

Tytuł:

Synthesis, characterization, structural and optical properties of titanium-dioxide nanoparticles using Glycosmis cochinchinensis Leaf extract and its photocatalytic evaluation and antimicrobial properties

Autorzy:

Rosi, H.
Kalyanasundaram, S.

Powiązania:

https://bibliotekanauki.pl/articles/1112681.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Glycosmis cochinchinensis
Photocatalytic evaluation and Antimicrobial properties
Titanium dioxide nanoparticles

Opis:

The present study reports on the development of an Eco-friendly, nontoxic, inexpensive and low cost effective method for green synthesis of titanium dioxide nanoparticles, using Glycosmis cochinchinensis leaf extract. X-Ray diffraction (XRD), Ultraviolet spectral studies (UV-Vis), Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy and Energy dispersive spectrometry (SEM–EDS) and Transmission electron microscopy (TEM) were used to characterize the TiO2 nanoparticles, while the application of TiO2 nanoparticles was assessed and antimicrobial activity was evaluated photocatalytically. XRD studies indicated that the titanium dioxide nanoparticles were crystalline in nature and in the anatase phase. According to our derived data, TiO2 nanoparticles exhibited maximum absorbance peak at 430 nm in UV-Vis spectroscopy and the band gap energy was to be found to be 3.02 eV. FTIR spectral studies confirm that flavonoids and proteins are the stabilizing agents of the TiO2 nanoparticles. The SEM and TEM images indicate that the morphology of the product is spherical nanoparticles with an average particle size of 40 ±5 nm with standard deviation. The antibacterial activity of the TiO2 nanoparticles was tested against gram positive bacteria (S. saprophyticus and B. subtilis) and gram negative bacteria (E. coli and P. aeruginosa). Accordingly, maximum zone of inhibition was observed against gram negative bacteria. The antifungal activity of the TiO2 nanoparticles was then tested against Aspergillus niger and Trichoderma reesei. Herein, maximum zone of inhibition was found to be 60 mm against T.reesi. Hence, Glycosmis cochinchinensis leaf extract green synthesized TiO2 nanoparticles can be considered to be an effective antimicrobial agent.

Źródło:

World News of Natural Sciences; 2018, 17; 1-15
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 29.

Tytuł:

The influence of admixtures on the course of hydrolysis of titanyl sulfate

Autorzy:

Grzmil, B.
Grela, D.
Kic, B.
Podsiadły, M.

Powiązania:

https://bibliotekanauki.pl/articles/779042.pdf

Data publikacji:

2008

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

dwutlenek tytanu
hydroliza
hydrate titanium dioxide
hydrolysis
titanyl sulfate
admixtures

Opis:

The study focused on the question how admixtures, such as iron(II), iron(III), magnesium and aluminium salts influence the degree of TiOSO4 conversion to hydrated titanium dioxide (HTD). Titanyl sulfate solution, an intermediate product in the industrial preparation of titanium dioxide pigments by sulfate route was used. The admixtures were added to the solution and their concentration was gradually changed. It was found that hydrolysis clearly depended on Fe(II) and Fe(III) concentrations. The higher the concentration of iron(II) (up to 5 wt %) in the solution was, the higher conversion degree was achieved. A reverse relationship was observed concerning the influence of iron(III) introduced up to 1.5 wt %. The constant rates of both phases of titanyl sulfate hydrolysis (including the formation of an intermediate colloidal TiO2 and final products) depended on iron(II) and iron(III) content in the solution. The concentration of other constituents did not influence hydrolysis in the investigated part of the process (up to 2.6 wt % of Mg and up to 0.3 wt % of Al). However, the size of primary particles of the obtained TiO2źnH2O did not depend on the content of the above-mentioned constituents in the solution.

Źródło:

Polish Journal of Chemical Technology; 2008, 10, 3; 4-12
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 30.

Tytuł:

Characterisation of nano-thin film GO/TiO2 layers for Kretschmann-based surface plasmon resonance visible sensing using FDTD method

Autorzy:

Khairulazdan, N. B.
Mohamed, R.
Berhanuddin, D. D.
Menon, P. S.

Powiązania:

https://bibliotekanauki.pl/articles/2033878.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

surface plasmon resonance
FDTD
titanium dioxide
graphene oxide
Kretschmann
biosensor

Opis:

Kretschmann-based surface plasmon resonance (K-SPR) is suitable for biomolecular sensing which provides label-free and quick detection results with real-time analysis. In this work, we have investigated the effect of graphene oxide (GO) with titanium dioxide (TiO2) thin films that are placed in hybrid above metal layers such as gold (Au), silver (Ag) and copper (Cu) with the presence of chromium (Cr) as an adhesive layer. The thickness of the Au, Ag and Cu metal thin films were optimized to 40, 30 and 30 nm, respectively, with a fixed thickness of GO of 2 nm and TiO2 of 1.9 nm. The sensing was evaluated for SPR excitation at three different visible wavelengths of 633, 670 and 785 nm. The performance of sensing was analyzed based on the reflectance intensity and full-width at half-maximum (FWHM) of the spectrum using the finite-difference time-domain (FDTD) method. The sensitivity was calculated for analyte sensing in dielectric mediums of air versus water. The sensitivity increment percentage (%∆S ) was determined when comparing analyte detection using Cr/metal and Cr/metal/GO/TiO2 sensor structures. The highest sensitivity of 94.51 deg/RIU was achieved for Cr/Cu/GO/TiO2 K-SPR sensor at 633 nm wavelength.

Źródło:

Optica Applicata; 2021, 51, 4; 579-587
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 31.

Tytuł:

Photocatalytic properties of Ti–V oxides thin films

Autorzy:

Domaradzki, J
Mazur, M
Sieradzka, K
Wojcieszak, D
Adamiak, B

Powiązania:

https://bibliotekanauki.pl/articles/174210.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

titanium dioxide (TiO2)
thin films
magnetron sputtering
vanadium
photocatalysis

Opis:

In this work, the photocatalytic properties of Ti–V oxides thin films with 19 and 23 at.% of vanadium addition have been outlined. The films were deposited by the high energy reactive magnetron sputtering method. X-ray photoelectron spectroscopy measurements were done in order to determine the chemical composition and binding energy of the elements on the samples surface. Additionally, based on wettability measurements, the water contact angles were evaluated and were equal to ca. 94° and 55° for thin films with 19 and 23 at.% of V, respectively. This testifies about hydrophilic and hydrophobic properties, respectively. Photoactivity of thin films was determined by percent decomposition of phenol for 5 hours during UV–vis radiation exposure. The highest photocatalytic activity of 6.2%/cm2 was obtained for thin films with 19 at.% of V. It has been found that an increase in V amount in Ti–V oxides thin films to 23 at.% results in lowered to 3%/cm2 photocatalytic activity.

Źródło:

Optica Applicata; 2013, 43, 1; 153-162
0078-5466
1899-7015

Pojawia się w:

Optica Applicata

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 32.

Tytuł:

Influence of UV radiation on TiO2 nanoparticles antibacterial behaviour

Autorzy:

Szmajnta, K.
Szindler, M. M.

Powiązania:

https://bibliotekanauki.pl/articles/1818498.pdf

Data publikacji:

2020

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

titanium dioxide
nanoparticles
antibacterial properties
dwutlenek tytanu
nanocząstki
właściwości antybakteryjne

Opis:

Purpose: The influence of UV radiation on the antibacterial properties of titanium oxide nanoparticles was examined using yeast Saccharomyces cerevisiae strain for this purpose. Design/methodology/approach: Nanopowders were made with sol-gel method. Surface morphology studies of the obtained materials were made using Zeiss's Supra 35 scanning electron microscope. In order to confirm the chemical composition of observed nanopowders, qualitative tests were performed by means of spectroscopy of scattered X-ray energy using the Energy Dispersive Spectrometer (EDS). The DLS (Dynamic Light Scattering) method was used to analyse the particle size distribution using the AntonPaar Litesizer 500 nanoparticle size analyser. Changes in particle size distribution at elevated temperatures were also observed. The antibacterial properties of titanium oxide nanoparticles were examined by subjecting the yeast sample to irradiation with an UV lamp. Findings: Samples containing yeast Saccharomyces cerevisiae were irradiated with and without the addition of TiO2 nanoparticles. A faster decrease in the colony count was observed compared to irradiated exposures without the addition of a suspension. Practical implications: Presented materials can be used in the production of antibacterial coatings for surfaces occurring in public spaces such as schools, hospitals, public toilets for the simple and effective elimination of bacteria and fungi as a result of exposures. Originality/value: The antibacterial properties of titanium oxide nanoparticles under UV radiation were confirmed.

Źródło:

Archives of Materials Science and Engineering; 2020, 101, 1; 25--31
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 33.

Tytuł:

New type of photoactive materials based on TiO2 modified by anthraquinone derivatives
Nowe fotoaktywne materiały w oparciu o TiO2 modyfikowany pochodnymi antrachinonu

Autorzy:

Mech, K.
Szaciłowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/351186.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

dwutlenek tytanu
pochodne antrachinonowe
fotosensybilizacja
titanium dioxide
anthraquinone derivatives
photosensitization

Opis:

Anthraquinone derivatives chemisorbed at nanocrystalline TiO2 present a new type of photoactive hybrid materials. These systems consist of organic chromophores anchored to the semiconductor surface via oxygen atoms of hydroxyl or carbonyl group. The bond between the chromophore and the titanium atom at the semiconductor surface reveals strong covalent character which makes the material stable in wide spectrum of electric potential and in an acidic environment. In alkaline solutions hydrolysis can be observed. The electrodes made of a modified TiO2 generate photocurrents within 300-700 nm, compared, with 300-400 nm for unmodified TiO2. Such an efficient photosensitization is a result of mutual arrangement of energy levels of the molecule and energy bands of the semiconductor.
Zaadsorbowane na powierzchni nanokrystalicznego dwutlenku tytanu pochodne antrachinonu tworzą nowy rodzaj fotoaktywnych materiałów hybrydowych. Układy te są zbudowane z organicznych barwników zakotwiczonych na powierzchni półprzewodnika poprzez atomy tlenu grup hydroksylowych lub karbonylowych. Wiązanie pomiędzy barwnikiem a atomem tytanu na powierzchni półprzewodnika wykazuje silny charakter kowalencyjny, co czyni materiał stabilnym w szerokim zakresie potencjałów, a także w srodowisku kwasnym. W srodowisku zasadowym materiał ulega hydrolizie. Elektrody na bazie modyfikowanego TiO2 generuja fotoprady w zakresie 300-700 nm, podczas gdy elektrody z czystego TiO2 daja fotoprady w zakresie 300-400 nm. Tak wydajną fotosensybilizacją jest wynikiem wzajemnego położenie poziomów energetycznych cząsteczki oraz pasmami półprzewodnika.

Źródło:

Archives of Metallurgy and Materials; 2013, 58, 1; 269-273
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 34.

Tytuł:

Surface characteristics of dppc monolayers deposited from titanium dioxide–chitosan–hyaluronic acid subphases on a glass support

Autorzy:

Ładniak, Agata
Jurak, Małgorzata
Wiącek, Agnieszka Ewa

Powiązania:

https://bibliotekanauki.pl/articles/1034201.pdf

Data publikacji:

2019

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

DPPC
chitosan
hyaluronic acid
surface free energy
titanium dioxide
topography

Opis:

The Langmuir-Blodgett technique was used to transfer the monolayers of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) from the subphase containing chitosan (Ch) and/or titanium(IV) oxide (TiO2) and/or hyaluronic acid (HA) on glass plates after a low-temperature air plasma treatment. The surface free energy and its components were determined on the basis of advancing and receding contact angle measurements of water (W), formamide (F), and diiodomethane (DM). To estimate the total surface free energy (), the contact angle hysteresis (CAH) model was used, and the obtained data were compared with the results calculated from the Lifshitz-van der Waals/acid–base (LWAB) approach. It was found that the subphase components modify the surface of the phospholipid monolayer by changing the type and magnitude of interactions. They were reflected as significant differences in the obtained values of total surface free energy and its components. These findings can help in the development of composite materials, thereby expanding the spectrum of applications for chitosan, TiO2, and HA, as well as understanding the interactions between biomaterial and cell.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2019, 24; 106 - 118
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 35.

Tytuł:

Successive Methods for the Separation of Titanium Oxide from the Black Sands of Ecuador

Autorzy:

Perez, S. M.
Sharadqah, S.

Powiązania:

https://bibliotekanauki.pl/articles/123820.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

ion-exchange resin
muisne
Eesmeraldas
Ecuador
black sands
titanium dioxide

Opis:

The black sands found on certain Ecuadorian beaches present a high ilmenite contents up to 50%. In this work, TiO₂ was obtained from the black sands of Muisne beaches – Ecuador by combining the thermal, chemical and ion exchange treatments. For the thermal treatment, the raw material was smelted at temperature of 1100 °C using a basic flux. Subsequently, the chemical treatment was initiated in the presence of Fe⁰ metal using chemical digestion with HCl, and the sample was purified by separating the precipitates from a series of reactions developed at different pHs with NH₄OH, Na₂S and HCl. The final effluent resulting from the last HCl digestion was purified by ion exchange using Amberlite IRA 400 resin of strongly anionic character. The effluent is then treated in basic medium and the resulting precipitate is calcined. The recovery yield of the TiO₂ pigment was 46% with 92% purity.

Źródło:

Journal of Ecological Engineering; 2018, 19, 1; 186-190
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 36.

Tytuł:

Titanium dioxide as a safe additive to sunscreen emulsions

Autorzy:

Janczarek, Marcin
Szaferski, Waldemar

Powiązania:

https://bibliotekanauki.pl/articles/2202886.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sunscreen emulsions
titanium dioxide
photocatalysis
emulsjeado opalania
dwutlenek tytanu
fotokataliza

Opis:

Titanium dioxide with its ability to be a UV light blocker is commonly used as a physical sunscreen in the cosmetic industry. However, the safety issues of TiO2 application should be considered more in-depth, e.g., UV light-induced generation of reactive oxygen species which can cause DNA damage within skin cells. The proper modification of titanium dioxide to significantly limit its photocatalytic properties can contribute to the safety enhancement. The modification strategies including the process conditions and intrinsic properties of titanium dioxide were discussed. The selected examples of commercially available TiO2 materials as potential components of cosmetic emulsions dedicated for sunscreens were compared in this study. Only rutile samples modified with Al2O3 and/or SiO2 showed inhibition of photocatalytic activity.

Źródło:

Chemical and Process Engineering; 2022, 43, 4; 483--490
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 37.

Tytuł:

Combination of mesoporous titanium dioxide with MoS2 nanosheets for high photocatalytic activity

Autorzy:

Karimi, L.

Powiązania:

https://bibliotekanauki.pl/articles/778657.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

MoS2 nanosheet
mesoporous titanium dioxide
photocatalytic
ultrasound
direct green 6

Opis:

This study presents a facile approach for the preparation of MoS₂  nanosheet decorated by porous titanium dioxide with effective photocatalytic activity. Mesoporous titanium dioxide nanostructures first synthesized by a hydrothermal process using titanium (III) chloride and then the MoS₂ /TiO₂  were prepared through mixing of MoS₂  nanosheet with mesoporous titanium dioxide under ultrasonic irradiation. The synthesized nanocomposite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), and Brunauer-Emmett-Teller (BET) analysis. The results showed that the nanocomposite has mesoporous structure with specific surface area of 176.4 m² /g and pore diameter of 20 nm. The as-prepared MoS₂ /TiO₂  nanocomposites exhibited outstanding photocatalytic activity for dye degradation under sunlight irradiation, which could be attributed to synergistic effect between the molybdenum disulfide nanosheet and mesoporous titanium dioxide. The photocatalytic performance achieved is about 2.2 times higher than that of mesoporous TiO₂  alone. It is believed that the extended light absorption ability and the large specific surface area of the 2D MoS₂  nanosheets in the nanocomposite, leading to the enhanced photocatalytic degradation activity.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 2; 56-60
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 38.

Tytuł:

Effects of processing parameters on hydrolysis of TiOSO4

Autorzy:

Grzmil, B.
Grela, D.
Kic, B.

Powiązania:

https://bibliotekanauki.pl/articles/778719.pdf

Data publikacji:

2009

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

dwutlenek tytanu
hydroliza
siarczan tytanylu
hydrate titanium dioxide
hydrolysis
titanyl sulfate

Opis:

The influence of both TiOSO4 concentrations in the starting solution and a way of conducting hydrolysis on the degree of titanyl sulphate conversion to hydrated titanium dioxide were studied. Titanyl sulphate solution, an intermediate product in the commercial preparation of titanium dioxide pigments by sulphate method, was used. The continuous method of conducting hydrolysis was applied using one or two reactors connected in series. It was found that the degree of hydrolysis markedly depends on the studied parameters. It was also found that TiOSO4 hydrolysis using the continuous method should be conducted: i) at a possibly low concentration of free sulfuric acid in the solution and; ii) in two or more rectors connected in series.

Źródło:

Polish Journal of Chemical Technology; 2009, 11, 3; 15-21
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 39.

Tytuł:

Preliminary studies of photocatalytic activity of gypsum plasters containing TiO₂ co-modified with nitrogen and carbon

Autorzy:

Janus, M.
Bubacz, K.
Zatorska, J.
Kusiak-Nejman, E.
Czyżewski, A.
Morawski, A. W.

Powiązania:

https://bibliotekanauki.pl/articles/778867.pdf

Data publikacji:

2015

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

titanium dioxide
gypsum
TiO2/N
self-cleaning
Reactive Red 198

Opis:

The conducted studies were focused on the development of the gypsum material exhibiting self-cleaning properties. To this end, the raw gypsum was mixed with unique TiO₂-based photocatalysts, previously modified by nitrogen and/ or carbon doping. The photocatalytic activity of the obtained gypsum plasters was evaluated trough the degradation of model organic compound (Reactive Red 198) under UV-vis irradiation. The impact of the photocatalysts presence on the physicochemical properties of the obtained gypsum plasters was evaluated. Furthermore, the role of non-metals presence on the photocatalytic properties of the TiO₂ was determined. It was confirmed that the addition of N,C co-modified titanium dioxide into gypsum bestows this material with self-cleaning properties. The highest dye removal rate was displayed by the gypsum plaster containing optimal amount (10 wt%) of co-modified TiO₂/N,C photocatalyst, after 20 hours of UV-vis irradiation.

Źródło:

Polish Journal of Chemical Technology; 2015, 17, 2; 96-102
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 40.

Tytuł:

Fotokatalizatory hybrydowe z matrycą TiO₂ aktywowaną ftalocyjaninami lantanowców
Hybrid photocatalysts with a TiO2 matrix sensitized with lanthanide phthalocyanines

Autorzy:

Słota, R.
Dyrda, G.
Galbas, M.
Mele, G.

Powiązania:

https://bibliotekanauki.pl/articles/142009.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

ftalocyjaniny
ditlenek tytanu (anataz)
fotooksydacja
fotokatalizator
phthalocyanines
titanium dioxide (anatase)
photooxidation
photocatalyst

Opis:

Przedstawiono wyniki badań aktywności nowego typu fotokatalizatorów hybrydowych z matrycą TiO2 (anataz) impregnowaną diftalocyjaninami lantanowców (LnPc2), w procesie fotoutleniania 4-nitrofenolu w fazie wodnej. Stwierdzono, że w obecności odpowiedniego sensybilizatora ftalocyjaninowego szybkość degradacji 4-NP może zwiększyć się nawet 4-krotnie w porównaniu z czystym anatazem. Najbardziej efektywne były układy zawierające kompleksy Gd i Ho.
Research results on the activity of novel hybrid photocatalysts with a TiO2 (anatase) matrix impregnated with lanthanide diphthalocyanines (LnPc2) in photooxidation of 4-nitrophenol in the water phase have been reported. It was found that in presence of an appropriate phthalocyanine sensitizer the degradation rate of 4-NP might have increased even four-fold, as compared to bareanatase. Systems containing complexes of Gd and Ho were the most effective ones.

Źródło:

Chemik; 2014, 68, 4; 385-390
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 41.

Tytuł:

Corrosion Damage Mechanisms of TiO2 Cold-Sprayed Coatings

Autorzy:

Lachowicz, Marzena
Winnicki, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/2125544.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

titanium dioxide
cold-sprayed coatings
potentiodynamic polarization test
aluminum alloys
structural steel

Opis:

Cold spraying as a low-temperature coating deposition method is intended for thermally sensitive materials. Due to its precise temperature control, it limits the formation of structural defects, and can therefore be easily applied to spray corrosion protective coatings made from metal or metal-ceramic powders. However, the formation of pure ceramic coatings with the use of cold spraying is still not so common. Titanium dioxide is one of the most interesting ceramics due to its photocatalytic properties. Nevertheless, these types of coating materials usually work in a corrosion favoring humid atmosphere. In the presented paper, amorphous TiO2 powder was deposited onto aluminum alloys and steel substrates and then submitted to potentiodynamic corrosion tests in a 3.5 wt.% NaCl solution. The as-sprayed coating showed phase transition from amorphous TiO2 to anatase, and also revealed porosity. As a result, electrolytes penetrated the coating and caused undercoating corrosion in the tested environment of an aqueous NaCl solution. The analysis of the potentiodynamic curves showed that the presence of the coating decreased corrosion potential on both substrates. It arose from the mixed phases of TiO2, which consisted of photocathode - amorphous material and photoanode - crystalline anatase. The phase mixture induced the galvanic corrosion of metallic substrates in the presence of electrolytes. Moreover, pitting-like corrosion and coating delamination were detected in aluminium alloy and steel samples, respectively. Finally, the corrosion mechanism of the titanium dioxide coatings was characterized and described.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 3; 975--985
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 42.

Tytuł:

Ocena wybranych właściwości kompozytów fotokatalitycznych
Evaluation of some properties of photocatalytic composites

Autorzy:

Langier, B.
Pietrzak, A.

Powiązania:

https://bibliotekanauki.pl/articles/2065431.pdf

Data publikacji:

2017

Wydawca:

Politechnika Częstochowska

Tematy:

dwutlenek tytanu
fotokatalizator
cement TioCem®
beton fotokatalityczny
titanium dioxide
photocatalysis
photocatalytic concrete

Opis:

W artykule omówiono fotokatalityczne właściwości dwutlenku tytanu oraz jego zastosowania w technologii kompozytów cementowych. Przedstawiono wyniki badań eksperymentalnych cementu TioCem® CEM II/A-S 42,5R i cementu portlandzkiego CEM I 42,5R w oparciu o testy wykonane na beleczkach z zaprawy normowej oraz zaprawy na bazie piasku i kruszywa drobnego.
The article discusses the photocatalytic properties of titanium dioxide and its use in cement composites technology. The test results of experimental TioCem® cement CEM II / A-S 42.5 and Portland cement CEM I 42.5 based on tests performed on standardized mortar and mortar based on sand and fine aggregate were presented.

Źródło:

Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2017, 1 (19); 15--20
2299-8535
2544-963X

Pojawia się w:

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 43.

Tytuł:

Badania skuteczności fotokatalitycznego oczyszczania ścieków farbiarskich
Photocatalytic treatment of dye effluents

Autorzy:

Biłyk, A.
Wolska, M.

Powiązania:

https://bibliotekanauki.pl/articles/236400.pdf

Data publikacji:

2004

Wydawca:

Polskie Zrzeszenie Inżynierów i Techników Sanitarnych

Tematy:

barwnik
reakcja fotokatalityczna
dwutlenek tytanu
sensybilizacja
dyestuff
photocatalysis reaction
titanium dioxide
sensibilization

Opis:

W artykule przedstawiono wyniki badań nad fotokatalitycznym rozkładem barwników i ścieków farbiarskich, wykorzystując do tego celu dwutlenek tytanu jako sensybilizator. Barwniki wykazują niewielką podatność na fotolizę, a ubytek OWO rośnie wraz ze wzrostem stężenia roztworu. Stwierdzono, że rozkład barwników farbiarskich (czerń bezpośrednia, żółć tytanowa, indygocarmin) pod wpływem promieniowania UV zachodził z małą wydajnością, a ubytek OWO nie przekroczył 30%. Naświetlanie roztworów barwników promieniami UV w obecności dwutlenku tytanu i nadtlenku wodoru zwiększyło skuteczność rozkładu barwników. Obniżenie OWO wynosiło około 80%, przy czym szybkość jego ubytku rosła wraz ze wzrostem stężenia początkowego barwnika i zależała od jego rodzaju. Wykazano, że ścieki farbiarskie były podatne na fotokatalityczny rozkład. Po dwugodzinnym naświetlaniu promieniami UV uzyskano 60-90% ubytek OWO.
Dyes and spent dyebaths were degraded by photocatalysis, using titanium dioxide as the sensitizing agent. The investigated dyes (direct black, titanium yellow, indygocarmin) showed a low sensitivity to photolysis, and TOC reduction was found to increase with the increasing concentration of the solution. UV radiation yielded a low efficiency of degradation, with a TOC reduction of 30% or under. The exposure of the dye solution to UV radiation in the presence of titanium dioxide and hydrogen peroxide enhanced the extent of dye degradation. The reduction in TOC then approached 80%. The rate of TOC reduction depended on the kind of the dye used and rose with the increase in the initial dye concentration. The dye effluents were sensitive to photocatalytic degradation. After two hours of exposure, the extent of TOC reduction ranged between 60 and 90%.

Źródło:

Ochrona Środowiska; 2004, R. 26, nr 2, 2; 31-34
1230-6169

Pojawia się w:

Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 44.

Tytuł:

Fabrication of Dye Sensitized Solar Cell Based on Natural Photosensitizers

Autorzy:

Nirmala, M.
Sahana, S.
Iswarya, B.
Maruvarasi, K.
Jenita, A. Adline
Kavitha, B.

Powiązania:

https://bibliotekanauki.pl/articles/1031877.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Efficiency
FTIR spectroscopy
Functional
Natural Dyes
Solar cell
nanocrystalline materials
nanocrytalline titanium dioxide

Opis:

Dye Sensitized solar cells were fabricated using with natural extracts and TiO2 is used as a semiconducting layer. The layer of nanocrytalline titanium dioxide was deposited on conductive side of the transparent Fluorine doped Tin Oxide (FTO) glass plate and the other side of the plate is coated with graphite. Voltage and Current values are measured for natural dyes coated FTO plate and I-V characteristic curves of all fabricated cells were drawn and analyzed. The highest power conversion efficiencies of Blueberry (0.79872%) and Beetroot (0.745813 %.) dyes were achieved among 10 dyes. The functional groups of Beetroot and Turmeric natural dyes were confirmed under FTIR spectroscopy. The ease and cost efficiency of the overall fabrication process, extensive availability of these fruits/juices render them novel and low-cost candidates for Solar cell applications.

Źródło:

World Scientific News; 2020, 149; 128-139
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 45.

Tytuł:

Właściwości sorpcyjne adsorbentów na bazie dwutlenku tytanu oraz dwutlenku tytanu z dwutlenkiem manganu
Sorption properties of adsorbents based on titanium dioxide and titanium dioxide with manganese dioxide

Autorzy:

Hernet, Julia
Czyżewska, Magda
Sołtysiak, Agnieszka

Powiązania:

https://bibliotekanauki.pl/articles/2055883.pdf

Data publikacji:

2019

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB

Tematy:

adsorpcja
spektroskopia
właściwości sorpcyjne
dwutlenek tytanu
dwutlenek manganu
adsorption
spectroscopy
sorption properties
titanium dioxide
manganese dioxide

Opis:

Adsorpcja to jeden z najistotniejszych procesów międzyfazowych zachodzących na powierzchniach substancji. Na podstawie pomiaru adsorpcji można określić właściwości sorpcyjne materiałów. Dokładne zbadanie właściwości sorpcyjnych pozwala na sprecyzowanie dalszego zastosowania danego materiału. Substancje o właściwościach sorpcyjnych znalazły szerokie zastosowanie w przemyśle chemicznym i elektroenergetycznym, w budowie maszyn i pojazdów, są także stosowane w ochronie środowiska naturalnego. W pracy przedstawiono badania właściwości sorpcyjnych materiałów na bazie TiO2, które można wykorzystać w procesach oczyszczania wody. Pomiary przeprowadzono metodą spektrofotometryczną; wykorzystano: spektroskopię w podczerwieni (IR), termograwimetrię (TGA), badania adsorpcyjne oraz metodę mikroskopową.
Adsorption is one of the most important interfacial processes occurring on the surfaces of substances. Based on the adsorption measurement the sorption properties of the materials can be determined. A thorough examination of sorption properties allows to specify further use of a given material. Substances possessing sorption properties have found wide application in the chemical and power industry in the construction of machines and vehicles, and are also used in environmental protection. As part of this work, the sorption properties of TiO2 – based materials that could be used in water purification processes were investigated. The measurements were carried out by the spectrophotometric method, where infrared spectroscopy (IR), thermogravimetry (TGA), adsorption studies and microscopic method were used.

Źródło:

Postępy w Inżynierii Mechanicznej; 2019, nr 14(7); 53--62
2300-3383

Pojawia się w:

Postępy w Inżynierii Mechanicznej

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 46.

Tytuł:

Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties

Autorzy:

Nycz, Marta
Paradowska, Ewa
Arkusz, Katarzyna
Pijanowska, Dorota Genowefa

Powiązania:

https://bibliotekanauki.pl/articles/307103.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

dwutlenek tytanu
TiO2
modyfikacja termiczna
wyżarzanie
titanium dioxide (TiO2)
titanium nanotubes
thermal modification
annealing

Opis:

In this paper, electrochemical properties of the as-formed and thermally treated titanium dioxide (TiO2) nanotubes with diameter in the range of 20–100 nm and height in the range of 100–1000 nm were presented. In addition, the effects of annealing temperature (450–550 °C) on the electrochemical characteristics of these structures, as well as the influence of diameter and height of TiO2 nanotubes on these properties were examined. The results were referred to a compact TiO2 layer (100 nm thick). Methods: The electrochemical test included open circuit potential, impedance spectroscopy and cyclic voltammetry measurements. The scanning electron microscope with energy dispersive spectroscopy analyser, x-ray photoelectron spectroscopy, and x-ray diffraction analysers were used for surface morphology characterisation as well as elemental, phase and chemical composition of TiO2 layers. Results: It was found that nanotubes with the diameter of 50 and 75 nm (height of 1000 nm) annealed at 550 °C exhibit the lowest impedance and phase angle values. However, the voltammetric detection of potassium ferricyanide indicated that the closest to 1 Ipc /Ipa ratio were shown by nanotubes with a diameter of 50 and 75 nm annealed at 450 °C. Conclusions: On the basis of performed analysis, it can be stated that the TiO2 layer with nanotubes of 50 nm in diameter and of 1000 nm in height, annealed in 450 °C may be indicated as the ones having the most favourable sensing and biosensing properties.

Źródło:

Acta of Bioengineering and Biomechanics; 2020, 22, 1; 165-177
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 47.

Tytuł:

Nanocząstki tlenku tytanu(IV) : zastosowanie w produktach użytkowych, badania właściwości i oznaczanie techniką spektrometrii mas z plazmą indukcyjnie sprzężoną pracującą w trybie pojedynczej cząstki
Titanium dioxide nanoparticles : application in consumer products, study of properties and determination by single particle inductively coupled plasma – mass spectrometry

Autorzy:

Gruszka, Jakub
Malejko, Julita
Godlewska-Żyłkiewicz, Beata

Powiązania:

https://bibliotekanauki.pl/articles/172064.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Chemiczne

Tematy:

nanocząstki tlenku tytanu(IV)
rozdzielanie
techniki łączone
titanium dioxide nanoparticles
separation
hyphenated techniques

Opis:

The rapid growth in the production and use of nanomaterials is observed in recent years. Nanoparticles of titanium dioxide (TiO₂NPs) are one of the most frequently used nanomaterials. Sunscreens, food additives, food contact materials and textiles are the major fields of current application of TiO₂NPs. Due to increasing use of nanomaterials in daily life and thus increasing exposure to them, concerns have been raised about their safety. Likely routes of human exposure to released TiO₂NPs as well as their health and environmental effects are presented in this paper. At present, our knowledge about the risk of nanomaterials is incomplete. However, it is known that toxicity of nanoparticles depends on their size, shape, crystal structure, surface morphology, surface area, charge, concentration and solubility (the possibility of dissolution into ionic forms). Therefore, it is necessary to use several complementary analytical techniques to fully characterize the NPs. Common approaches used for the characterization of nanomaterials include microscopy based techniques e.g. transmission electron microscopy (TEM), X-ray techniques e.g. X-ray diffraction (XRD), methods based on optical properties e.g. dynamic light scattering (DLS). Separation of nanoparticulate and ionic forms of metal can be accomplished using chromatographic techniques (such as high performance liquid chromatography (HPLC), size exclusion chromatography (SEC), hydrodynamic chromatography (HDC)) or capillary electrophoresis (CE). Size-resolved NPs and dissolved (ionic) fractions can be further characterized by on-line detectors, such as ICP MS. Recently, single particle inductively coupled plasma mass spectrometry (sp ICP MS) has been gaining increasing attention as a technique for detection, characterization, and quantification of nanoparticles. This technique provides information on individual particles, including particle size, number size distribution, particle number concentration and mass concentration. In addition, sp ICP MS can distinguish dissolved and nanoparticulate forms of an element. The fundamentals, advantages and limitations of this technique, as well as its application for the characterization and quantification of TiO₂NPs in different matrices (consumer products, food and environmental samples) are reviewed in this paper.

Źródło:

Wiadomości Chemiczne; 2019, 73, 5-6; 367-400
0043-5104
2300-0295

Pojawia się w:

Wiadomości Chemiczne

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 48.

Tytuł:

Influence of titanium dioxide modification on the antibacterial properties

Autorzy:

Rokicka, P.
Markowska-Szczupak, A.
Kowalczyk, Ł.
Kowalska, E.
Morawski, A. W.

Powiązania:

https://bibliotekanauki.pl/articles/778569.pdf

Data publikacji:

2016

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

antibacterial properties
Escherichia coli K12
modified photocatalysts
titanium dioxide
visible-responsive photocatalysts

Opis:

Antibacterial properties of 15 titania photocatalysts, mono- and dual-modified with nitrogen and carbon were examined. Amorphous TiO₂ , supplied by Azoty Group Chemical Factory Police S.A., was used as titania source (Ar-TiO₂ , C-TiO₂ , N-TiO₂ ;2 and N,C-Ti₂ 2 calcined at 300°C, 400°C, 500°C, 600°C, 700°C). The disinfection ability was examined against Escherichia coli K12 under irradiation with UV and artificial sunlight and in dark conditions. It has been found the development of new photocatalysts with enhanced interaction ability with microorganisms might be a useful strategy to improve disinfection method conducted under artificial sunlight irradiation. The efficiency of disinfection process conducted under artificial sunlight irradiation with carbon (C-TiO₂ ) and carbon/nitrogen (N,C-TiO₂ ) photocatalysts was similar as obtained under UV irradiation. Furthermore, during dark incubation, any toxicity of the photocatalyst was noted.

Źródło:

Polish Journal of Chemical Technology; 2016, 18, 4; 56-64
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 49.

Tytuł:

Nanocząstki ditlenku tytanu – działanie biologiczne
Titanium dioxide nanoparticles – Biological effects

Autorzy:

Świdwińska-Gajewska, Anna M.
Czerczak, Sławomir

Powiązania:

https://bibliotekanauki.pl/articles/2166213.pdf

Data publikacji:

2015-01-09

Wydawca:

Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi

Tematy:

ditlenek tytanu
nanocząstki
narażenie zawodowe
działanie toksyczne
titanium dioxide
nanoparticles
occupational exposure
toxicity

Opis:

Ditlenek tytanu (TiO₂) może występować w postaci cząstek o różnej wielkości. Najczęściej wykorzystywane są cząstki o rozmiarze do 100 nm odpowiadające wielkością nanocząstkom oraz cząstki o wielkości z przedziału 0,1–3 mm. Ditlenek tytanu nie jest klasyfikowany jako substancja szkodliwa w postaci większych cząstek, jednak nanocząstki TiO₂ mogą wywołać wiele negatywnych efektów zdrowotnych. Narażenie inhalacyjne na nano-TiO₂ wywołuje stan zapalny, mogący prowadzić do zmian zwłóknieniowych i proliferacyjnych w płucach. Istnieje wiele prac na temat genotoksycznego działania TiO₂ na komórki ssaków i ludzi, szczególnie w przypadku nanocząstek. U szczurów narażanych inhalacyjnie na nanocząstki TiO₂ zaobserwowano powstawanie nowotworów. Nie ma jednak dowodów na wzrost dodatkowego ryzyka wystąpienia raka płuca lub zgonu związanego z tą chorobą u osób zawodowo narażonych na pył TiO₂. Istnieją badania potwierdzające negatywny wpływ nanocząstek TiO₂ na rozwój płodu i funkcje układu rozrodczego u zwierząt. Nanocząstki TiO2 znajdują coraz szersze zastosowanie i tym samym zwiększa się ryzyko narażenia na nanocząstki ditlenku tytanu w środowisku pracy. Wobec tak niepokojących danych dotyczących biologicznego działania nanocząstek TiO₂ należy zwrócić większą uwagę na narażenie i jego skutki dla zdrowia pracowników. Właściwości nanocząstek, ze względu na większą powierzchnię i reaktywność, różnią się istotnie od frakcji wdychalnej, dla której obowiązują obecnie normatywy higieniczne w Polsce. Med. Pr. 2014;65(5):651–663
Titanium dioxide occurs as particles of various sizes. Particles of up to 100 nm, corresponding to nanoparticles, and in the size range of 0.1–3 mm are the most frequently used. Titanium dioxide in a bulk form is not classified as dangerous substance, nevertheless nanoparticles may cause adverse health effects. Inhalation exposure to nano-TiO₂ causes pulmonary inflammation that may lead to fibrotic and proliferative changes in the lungs. Many studies confirm the genotoxic effect of TiO₂, especially in the form of nanoparticles, on mammal and human cells. In rats exposed to TiO₂-nanoparticles by inhalation the development of tumors has been observed. However, there is no evidence of additional lung cancer risk or mortality in workers exposed to TiO₂ dust. There are some studies demonstrating the adverse effect of TiO₂-nanoparticles on fetal development, as well as on reproduction of animals. TiO₂ nanoparticles find a still wider application and thus the risk of occupational exposure to this substance increases as well. Considering such alarming data on the biological activity of TiO₂ nanoparticles, more attention should be paid to occupational exposure and its health effects. Properties of the nanoparticles, due to their larger surface area and reactivity, differ significantly from the inhalable dust of TiO₂, for which the hygiene standards are mandatory in Poland. Med Pr 2014;65(5):651–663

Źródło:

Medycyna Pracy; 2014, 65, 5; 651-663
0465-5893
2353-1339

Pojawia się w:

Medycyna Pracy

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce

Skocz do pozycji: 50.

Tytuł:

Aktywność antybakteryjna domieszkowanych srebrem powłok TiO2 wytwarzanych metodą RF PECVD
Antibacterial activity of Ag doped TiO2 films deposited by RF PECVD method

Autorzy:

Owczarek, S.
Sobczyk-Guzenda, A.
Szymanowski, H.
Volesky, L.
Jakubowski, W.
Gazicki-Lipman, M.

Powiązania:

https://bibliotekanauki.pl/articles/286233.pdf

Data publikacji:

2014

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

ditlenek tytanu
srebro
bakteriobójczość
RF PECVD
titanium dioxide
silver
antibacterial properties
RF PECVD technique

Opis:

W ramach pracy wykorzystano metodę RF PECVD (Radio Frequency Plasma Enhanced Chemical Vapour Deposition) do wytworzenia powłok TiO2-Ag. Domieszkowanie ditlenku tytanu srebrem miało na celu intensyfikację właściwości fotokatalitycznych i bakteriobójczych wykazywanych przez ten materiał. Związkiem wyjściowym jonów srebra był acetyloacetonian srebra. Kontrola jego temperatury umożliwiła wytworzenie na podłożach krzemowych powłok o różnej zawartości srebra. Ze względu na to, że korzystny wpływ jonów srebra na powłokę TiO2 występuje przy ich niskim stężeniu, sterowano temperaturą sublimatora w taki sposób aby zawartość Ag w powłoce nie przekraczała kilku procent. Tak wytworzone powłoki zbadano na spektrometrze EDX (Energy Dispersive X-Ray) pod kątem składu chemicznego. Analiza wyników dostarcza informacji o wprost proporcjonalnym wzroście udziału atomów Ag do wzrostu temperatury ich związku wyjściowego. Po naświetleniu powłok światłem z zakresu UV określono wartość fotozwilżalności przez wodę oraz przeżywalności bakterii E. coli na ich powierzchni. Z badań kąta zwilżania wynika, że zaledwie kilkuminutowe naświetlanie promieniowaniem UV może wystarczyć do uzyskania przez powłokę właściwości superhydrofilowych. Najsilniejszą zwilżalność powierzchni wykazuje powłoka o najmniejszej zawartości srebra (0,03%). W przypadku badań bakteriobójczych czas naświetlania (2 lub 4 min.) promieniowaniem UV nie wpływa w sposób istotny na wartość przeżywalności bakterii. Bardziej istotnym czynnikiem jest zawartość srebra w powłoce - zbyt duża ilość powoduje obniżenie właściwości bakteriobójczych.
In present work RF PECVD (Radio Frequency Chemical Vapour Deposition) technique was used to prepare TiO2-Ag coatings. The purpose of preparing silver doped titanium dioxide coatings was to step up photocatalytic and antibacterial properties of this substance. Silver acetylacetonate was the precursor of silver ions. Thanks to temperature control it was possible to prepare coatings of different Ag contain at silicon substrates. The temperature was controlled so that not to exceed a few percentage amount of silver in the coating, because its favourable influence on TiO2 coatings exists when concentration of silver ions is low. Coatings were examined under EDX (Energy Dispersive X-Ray) spectrometer to check atomic contain of elements. The results show that the percentage of Ag atoms increases directly proportionally to the temperature increase of its precursor. After exposition to UV radiation the water photo hydrophillic and bactericidal properties of coatings were measured. The water contact angle measurements have shown that super hydrophillic properties were obtained just after few minutes of UV radiation exposition. The coating of lowest silver contain (0,03%) exhibit the lowest water contact angle. In case of bactericidal studies the time of UV radiation (2 or 4 minutes) does not influence much the bacteria survival rate. Silver content is a more important factor - to big amount causes decreasing of antibacterial properties of the coating.

Źródło:

Engineering of Biomaterials; 2014, 17, no. 128-129; 64-66
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

Zmień widok

• na półce