Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Sol-gel" wg kryterium: Temat


Tytuł:
Mechanical properties and cell viability of MgO-reinforced biografts fabricated for biomedical applications
Autorzy:
Demirel, M.
Powiązania:
https://bibliotekanauki.pl/articles/306588.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
MgO
sol-gel
biograft
cytotoksyczność
sol–gel
cytotoxicity
Opis:
In the present study, biografts were produced by sol gel method by adding different rates of MgO which has bone-like crystal structure and high endurance into different proportions of Ca(NO3)24H2O, KOH, NaNO3, and P2O5 compounds. The biografts were investigated in terms of mechanical and biocompatibility properties. FTIR, SEM and XRD analyses were carried out to examine the chemical characteristics and changes in structural morphology. Mechanical properties were also investigated by conducting hardness and compression tests. In addition, cytotoxicity tests were conducted by using osteoblast cells. While results of FTIR and XRD analyses revealed that all biografts had HA (hydroxyapatite) and β-TCP contents, MgO peaks were also observed in biografts. In SEM images, grains of NonMgO and MgO-10 biografts had sharper edges, pores formed between grains and grain size increase with increasing MgO amount (MgO-20 and MgO-30). It was found that compression stress and hardness values increased as MgO content elevated. From the cytotoxicity tests, no any toxic effect was observed in the syntesized biografts.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 4; 83-90
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroless Nickel Plating on AM60B Magnesium Alloy via Ti-Zr/Sol-Gel Composite Layer as Pretreatment
Autorzy:
Nazari, Zhale
Seifzadeh, Davod
Rajabalizadeh, Zahra
Powiązania:
https://bibliotekanauki.pl/articles/2125541.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sol-gel
Mg alloy
electroless plating
Opis:
The Ti-Zr and Ti-Zr/sol-gel were used as pretreatment layers before the electroless nickel coating on AM60B magnesium alloy. Scanning Electron Microscopy was employed to investigate the surface morphology of the pretreated layers and applied electroless coatings. Chemical analysis of the Ti-Zr layer, and nickel coatings was done using the Energy-Dispersive X-ray Spectroscopy. Moreover, the X-ray Diffraction and Atomic Force Microscopy methods were utilized to evaluate the microstructure and surface roughness of the electroless coatings, respectively. Electrochemical Impedance Spectroscopy was employed to study the corrosion behavior of Ni-P coatings. The results show that Ti-Zr layer has structural cracks, and the sol-gel film was covered all cracks entirely. The cauliflower-like electroless nickel coating was applied on both mentioned pretreated layers. The cross-sectional images revealed the higher thickness for the electroless coating on Ti-Zr/sol-gel layer, probably due to a large number of Ni nucleation centers. The EIS results demonstrate that the electroless coating on Ti-Zr/sol-gel has high corrosion protection and microhardness value.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 913--920
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genotoxicity of antibacterial bioglasses obtained by sol-gel method for Salmonella typhimurium
Autorzy:
Jadczyk, P.
Umińska-Wasiluk, B.
Ciołek, L.
Karaś, J.
Olszyna, A.
Powiązania:
https://bibliotekanauki.pl/articles/285920.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
bioglasses
sol-gel methods
periodontal disease
Źródło:
Engineering of Biomaterials; 2016, 19, 138; 61
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical resistance of SiO2 layers obtained by the sol–gel technique on a glass substrate
Autorzy:
Nocuń, M
Środa, M
Ciecińska, M
Powiązania:
https://bibliotekanauki.pl/articles/173238.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sol-gel
antireflection coating
sintering parameters
Opis:
The paper analyses the influence of heat treatment parameters on SiO2 coatings obtained by the sol–gel technique. Their adhesion to the glass substrate and corrosion resistance were studied. The changes in thickness and porosity with the firing temperature and time of sintering for the systems of 1, 2 and 3 layers in case of SiO2 layers were studied. It was shown that the sufficient durability of the SiO2 coating on the glass substrate can be achieved only by the appropriate selection of thermal treatment parameters. The results confirmed that higher sintering temperature is required for multilayer systems, as compared with a one-layer system.
Źródło:
Optica Applicata; 2015, 45, 1; 125-134
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft Chemistry - Synthesis of Nano-Titanium-Doped-Tellerium-Cadmium for Solar Cell Applications
Autorzy:
Elsabawy, Khaled M.
Powiązania:
https://bibliotekanauki.pl/articles/1192983.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Sol-Gel
Hydrolysis
AFM
XRD
Microstructure
SEM
Opis:
Soft chemistry procedures through sol–gel technique has applied to synthesize nano- Ti-doped CdTe composite. Gels were synthesized by the hydrolysis of a complex solution of Si(OC2H5)4, Cd(CH3COO)2•2H2O, Ti(CH3COO)4 and Te were heated from 350 to 600 °C in a H2─N2 atmosphere to form fine cubic CdTe doped crystals. The size of CdTe crystals, determined from the line broadening of X-ray diffraction pattern, increases from 6 to 21 nm in diameter with increasing heat-treatment temperature. Micro-structural features of Ti-doped CdTe crystals were characterized by both of AFM and SEM investigations . The analysis of micro-structural micrographs of both of SEM and AFM indicated that titanium additions improved the crystal growth of grain towards more lower grain size which ranged in between 1.4-2.5 μm while 0.67 μm through Scherrer’s calculations.
Źródło:
World Scientific News; 2016, 36; 61-72
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary evaluation of selected biologic properties of TiO2 and SiO2 layers on metallic substrates
Autorzy:
Urbański, W.
Dragan, S.
Gębarowska, E.
Dzięgiel, P.
Krzak-Roś, J.
Miller, M.
Pezowicz, C.
Będziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/284506.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
sol-gel coating
fibroblast
cytotoxicity
orthopaedic implant
Opis:
Despite of applying modern biomaterials during constructing long term orthopaedic implants, in clinical practice there are still present wide range of complications, particularly concerning matter of implant - tissue interactions. Since interaction between implant and living tissue depends mainly on biomaterial surface features, we decided to modify orthopaedic alloys to improve their biological properties. The object of this experiment was in vitro evaluation of selected biological properties, particularly cytotoxicity of titanium alloy and 316L stainless steel substrates coated with SiO2 or TiO2 thin films. The coatings were synthesized by sol-gel method. Each samples was placed into mouse fibroblast culture. The cultures in presence of tested materials were maintained for three days. We found no distinct toxic effect of tested biomaterials. We noticed increase of fibroblast proliferation in cultures with uncoated titanium and particularly SiO2 coated titanium plates.
Źródło:
Engineering of Biomaterials; 2010, 13, no. 96-98; 129-133
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental evaluation with chemical sensors in the Palace Museum of Wilanow
Autorzy:
Pena-Poza, J.
Garcia-Heras, M.
Palomar, T.
Laudy, A.
Modzelewska, E.
Villegas, M.
Powiązania:
https://bibliotekanauki.pl/articles/200179.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heritage
sensor
acidity
temperature
sol-gel
Wilanów
Opis:
Environmental evaluation arises as an innovative procedure to carry out preventive conservation of Cultural Heritage items. Parameters contributing to the proper conservation of such items can be monitored and assessed. Chemical sensors with optical response synthesised by the sol-gel method are useful for a complete and accurate environmental evaluation. Physical-chemical mechanisms of decay and degradation of materials can be predicted from the sensors response, which will favour the decisions on the adequate procedures to avoid damage. Sol-gel sensors prepared and applied in the present work are reversible, reusable and regenerable. Their optical response provides a change of colour vs. the parameters to which they are sensitive. Both temperature and environmental acidity have been monitored in several selected chambers of the Palace Museum of Wilanów (Warsaw, Poland). The optical response of sensors was recorded by visible spectrophotometry from June 2010 to December 2010. The results inform on the environmental conservation conditions, both indoor and outdoor the Palace. Main innovation of the research carried out concerns the evaluation of the environmental acidity as an essential parameter to be taken into account for the proper conservation that can not be measured by conventional methods.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 247-252
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostrukturalne materiały wybuchowe otrzymywane metodą zol-żel : synteza i właściwości
Nanostructured energetic materials with sol-gel chemistry : preparation and properties
Autorzy:
Kiciński, W.
Powiązania:
https://bibliotekanauki.pl/articles/209673.pdf
Data publikacji:
2007
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
energetic nanocomosities
sol-gel synthesis
oxygen balance
Opis:
Nową formą materiałów wysokoenergetycznych, która w ostatnich latach wzbudza duże zainteresowanie, są nanostrukturalne materiały wybuchowe (NanoMW). Materiały takie łączą zalety jednoskładnikowych MW (duża moc) i mieszanin pirotechnicznych (duża gęstość energii). W artykule opisano syntezę i wstępną charakterystykę nanokompozytów wybuchowych złożonych z żeli organicznych, pełniących rolę paliwa, i soli nieorganicznych pełniących rolę utleniacza. Wykorzystując znaną od wielu lat technikę zol-żel, otrzymano dwa typy wodnych zoli organicznych: zol rezorcynowo-formaldehydowy (RF) i rezorcynowo-furfuralowy (RFur), które mieszano następnie z roztworem soli nieorganicznych NH₄ClO₄, LiClO₄, Mg(ClO₄)₂ i NH₄NO₃. Mieszaniny takie poddawano procesowi żelatynizacji i powolnego suszenia, w wyniku którego otrzymywano hybrydowy, organiczno-nieorganiczny kompozyt zwany kserożelem, posiadający cechy materiału wybuchowego. Stężenie soli oraz dodatek drugiego, obok wody rozpuszczalnika (np. metanolu) do wodnego zolu ma zasadnicze znaczenie w procesie transformacji zolu w żel. Wybrane kompozyty badano przy wykorzystaniu wielu technik; SEM, HR, TEM, AFM, XRD i TG/DTA. Głównym celem tych badań było oszacowanie wielkości kryształów utleniacza nieorganicznego i jednorodności jego rozproszenia w matrycy polimerowej. Obserwacje SEM potwierdziły nanostrukturalny charakter kompozytów żel organiczny/sól nieorganiczna, w których kryształy soli (w zależności od rodzaju badanego materiału) mają wielkość 100-1000 nm i są równomiernie rozproszone w polimerze. Badania XRD wskazały, że poprzez zmianę składu żelu i sposobu jego suszenia możliwe jest otrzymanie znacznie mniejszych kryształów utleniacza. W przypadku kompozytu RFur/Mg(ClO₄)₂ utleniacz krystalizuje w polimerze rezorcynowo-furfuralowym w postaci nanokryształów o wielkości ok. 20 nm. Dodatkowo analiza HR TEM tego kompozytu wykazała obecność porów o wielkości 10 nm. Analizy TG/DTA potwierdziły wysokoenergetyczny charakter kompozytów kserożel/utleniacz nieorganiczny. Po ogrzaniu w płomieniu materały RF/LiClO₄ = 63/37, RFur/Mg(ClO₄)₂ = 60/40, spalają się wybuchowo, czemu towarzyszy efekt dźwiękowy i błysk.
Sol-gel synthesis and characterization of organic gel-based energetic materials are presented. Two types of polymetric sols: resorcinol-formaldehyde (RF), and resorcinol-furfural (RFur) sols were mixed in water-containg medium with water solution of inorganic salts NH₄ClO₄, LiClO₄, Mg(ClO₄)₂ and NH₄NO₃. After gelation and drying, the hybrid nanocomposities with the properties of energetic materials were obtained. It was stated that salt concentration and addition of second solvent (e.g. methanol) to the mixture of reagents has crucial meaning for gel formation. In the case when only water was used, a mixture of organic sol/inorganic salt-did not transfer from sol to gel and precipitates were formed. Conventional drying of wet gelled composites leads to rigid material called xerogels. The microstructure, morphology, and some other properties of chosen composities were studied by means of HR SEM, HR TEM, AFM, XRD, DTA/TG, and elemental analysis. SEM observation revelated that sizes of the oxidizer particles vary from less than 100 nm to c.a. 1000 nm.XRD patterns suggest that in some-cases, the crystal particles are of 20-30 nm in size. HR TEM images revelated that xerogels are porous materials with cavities, c.a. 10 nm. TG/DTA analyses showed that the tested composites decompose as typical energetic materials. If pre-heated and exposed to flame, some of them (especially RF/LiClO₄ = 63/37, RFur/Mg(ClO₄)₂ = 60/40 composites) undergo violent deflagration with loud sound and flash effect.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2007, 56, 3; 131-143
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and properties of TiO2, NiO and ZnO nanoparticles and their possible biomedical application
Autorzy:
Szmajnta, K.
Szindler, M.
Powiązania:
https://bibliotekanauki.pl/articles/378921.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
nanoparticles
sol-gel method
nanocząstki
metoda zol-żel
Opis:
Purpose: The main purpose of this publication is to bring closer method of synthesis and examining basic properties of TiO2, ZnO and NiO nanoparticles (NPs), and investigate their possible biomedical application. 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 and the structure using S/TEM TITAN 80-300 transmission 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 TiO2, ZnO and NiO NPs with spherical shape were successfully produced by sol-gel method. Findings: The diameter of the as prepared nanoparticles does not exceed 25 nm which is confirmed by the TEM analysis. The highest proportion among the agglomerates of the nanoparticles has been shown to show those with a diameter of 80 to 125 nm. The qualitative analysis of EDS confirmed the chemical composition of the material. Practical implications: Nanoparticles (NPs) has been receiving an incrementally increasing interest within biomedical fields researchers. Nanoparticles properties (physical, chemical, mechanical, optical, electrical, magnetic, etc.) are different from the properties of their counterparts with a larger particle size. Originality/value: The nanoparticles were prepared using sol-gel method which allows the particle size to be controlled in a simple way.
Źródło:
Archives of Materials Science and Engineering; 2019, 98, 2; 81-84
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion properties of Ca-doped TiO2 coatings
Autorzy:
Burnat, B.
Robak, J.
Leniart, A.
Skrzypek, S.
Brycht, M.
Powiązania:
https://bibliotekanauki.pl/articles/283933.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
biomaterials
surface modification
sol-gel method
doping
corrosion
Opis:
The paper presents the preparation and characterization of TiO2 coating doped with Ca produced by the sol-gel method using titanium alkoxide as the precursor of titania as well as calcium nitrate as dopant source. These coatings were used to modify the biomedical alloy M30NW. Using the optical microscopy and the atomic force microscopy the topography of synthesized coatings was characterized. Whereas using electrochemical methods the corrosion measurements were carried out. Anticorrosion properties of calcium-doped TiO2 coating were determined in PBS solution on the basis of corrosion potential Ecor, polarization resistance Rp, corrosion rate CR, current density in the passive range i0.5 and also breakdown Eb and repassivation Erep potentials. Analogous corrosion tests were also made for the uncoated alloy as well as for alloy coated with pure TiO2 coating. It was stated that modification of M30NW alloy surface by calcium-doped TiO2 coating shows anticorrosion properties in PBS solution. These properties are slightly lower compared to a pure TiO2 coating. The analysis of the topography of TiO2-based coatings showed that calcium doping increases the surface development and roughness of the obtained coatings.
Źródło:
Engineering of Biomaterials; 2014, 17, no. 128-129; 100-102
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Magnetic Properties of the U-Type Ferrite According to Substituted Elements
Autorzy:
Jeong, Kwang-Pil
Kim, Jeong-Gon
Yang, Su-Won
Yun, Jae-Ho
Choi, Jin-Hyuk
Powiązania:
https://bibliotekanauki.pl/articles/354006.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
U-type ferrite
hexagonal ferrite
sol-gel process
Opis:
The magnetic properties of the U-type ferrite synthesized by a sol-gel process had studied by substituting cobalt with manganese or zinc in cobalt-based U-type ferrite. The substituted U-type ferrite showed a dominant crystal structure at a different substitution ratio of manganese and zinc. The change of the starting temperature of U-type ferrite formation according to substitutional elements was confirmed by TG-DTA analysis. In the case of manganese substitution, the starting temperature of U-type ferrite formation lowered, and on the contrary, when zinc was substituted, it became higher. The magnetic properties of the U-type ferrite substituted with manganese showed a tendency that the saturation magnetization was decreased and the coercivity was increased as the manganese ratio increased. The highest saturation magnetization was 57.9 emu/g in the specific composition (Ba4Co0.5Zn1.5Fe36O60) substituted with zinc.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 501-505
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structured Analysis of Nanostructured Zinc Oxide (ZnO) Thin Films Deposited by Sol-Gel
Autorzy:
Hussin, Rosniza
Hanafi, F.
Rashid, R. A.
Harun, Z.
Kamdi, Z.
Ibrahim, S. A.
Ainuddin, A. R.
Rahman, W.
Leman, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/2134100.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sol-gel
zinc oxide
ZnO
thin films
nanostructured
Opis:
In this work, zinc oxide (ZnO) thin films are deposited on glass substrate using the sol-gel spin coating technique. The effect of annealing temperature on structural properties was investigated. The ZnO sol-gel was produced from zinc acetate dehydrate as the starting material with iso-propanol alcohol as the stabilizer. The ratio was controlled, distilled water and diethanolamine as the solvent mixing on a magnetic stirrer for an hour under constant heat of 60°C. The ZnO thin film was deposited using the spin coating technique with the speed of 3000 rpm for 30 minutes before the sample undergoes pre-heat in the oven at the temperature of 100°C for 10 minutes. The sample was annealing in the furnace for an hour at 200°C, 350°C, and 500°C. The X-ray diffraction (XRD) analysis confirms that hexagonal wurtzite structure with zincite and zinc acetate hydroxide hydrate composition. The thin films surface roughness was analyzed using an atomic force microscope (AFM) and scanning electron microscope (SEM) for surface morphology observation.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1055--1060
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying structural and optical properties of ZnO-CdO nanocomposites
Autorzy:
Abdul-Ameer, Zehraa N.
Agool, Ibrahim R.
Powiązania:
https://bibliotekanauki.pl/articles/1193878.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdO
ZnO
ZnO-CdO
nanocomposite
nanocomposites
sol gel
Opis:
Zinc oxide, cadimium oxide and their composites were synthesized in this research using sol-gel method and characterized by X-ray diffraction, to investigate their optical properties using UV-visible, photoluminenscence (PL) spectroscopy, which showed red shift behavior in the ZnO manner enhanced by addition of CdO which noticed through calculations of energy gap.
Źródło:
World Scientific News; 2015, 23; 35-45
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Crystal Structure and Magnetic Properties of Ba4Co2Fe36O60 by Sol-Gel Method
Autorzy:
Jeong, K.-P.
Yang, S.-W.
Kim, J.-G.
Powiązania:
https://bibliotekanauki.pl/articles/351655.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
U-type ferrite
sol-gel method
nano-powder
Opis:
U-type ferrite typified by Ba4Co2Fe36O60 is used as a RAM (Radar Absorbing Materials) in the X-band (8-12 GHz). Ba4Co2Fe36O60 is known to have a complex crystal structure, which makes it difficult to obtain single phase and have low reproducibility. Previously known U-type ferrites have been fabricated based on a ceramic process that mixing (by a ball mill), calcining, grinding, binder mixing, drying, sieving, pressing and sintering. In contrast, the process of preparing the powder by the sol-gel method and its heat-treating is advantageous in that it can reduce the process steps and the required time. In addition, the precise stoichiometric control by the sol-gel method can effectively evaluate the effect of added or substituted elements. In this study investigates the crystal structure of Ba4Co2Fe36O60 synthesized by the sol-gel method and the morphology of U-type ferrite nano-powders according to various heat treatment conditions. Analysis of the crystal structure is used for XRD. Morphology and size are observed by SEM. In addition, VSM is performed to confirm the change of magnetic properties according to various heat treatment conditions.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1449-1452
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Mechanical Characterization of Zirconium Based Sol-Gel Coatings on Glass
Autorzy:
Sitarz, M.
Drajewicz, M.
Jadach, R.
Długoń, E.
Leśniak, M.
Reben, M.
Wajda, A.
Gawęda, M.
Burtan-Gwizdała, B.
Powiązania:
https://bibliotekanauki.pl/articles/352458.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sol-gel coating
zirconium oxide
ellipsometry
Vickers hardness
Opis:
The basic factor limiting the use of glasses is their unsatisfactory mechanical strength. The improvement of the mechanical strength of glasses is usually obtained by applying their respective thin surface layers. The object of the research was glass coated with zirconium oxide. For the application of zirconium oxide layer, dip-coating method was used. The resulting materials were subjected to detailed examination of the microstructure (SEM), and mechanical tests (Vickers hardness and modulus of elasticity). In order to evaluate the optical characteristics, the tests were performed by UV/VIS. The thickness of the overlying layers were determined using the method of ellipsometry. The study showed that the obtained sol-gel layer of zirconium oxide (IV) on glasses influence the improvement of the mechanical properties. It has been shown that the applied layers have high adhesion to the substrate.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1747-1752
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors Affecting of Porous Properties of Carbon Gel Microsphere
Autorzy:
Elsayed, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/1194052.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
base catalysts
carbon microsphere
nitrogen adsorption
sol-gel polycondensation
Opis:
Carbon microsphere with high porosity and surface area were synthesized via the sol-gel polycondensation of resorcinol with formaldehyde in a slightly basic medium and followed by drying and pyrolysis. The effects of different parameters during synthesis were investigated. The porous properties of carbon microsphere were evaluated by nitrogen adsorption method and scanning electron microscopy (SEM). By changing both the catalyst species and resorcinol to catalyst ratio (R/C), it was possible to prepare ultramicroporous carbon sphere with pore size about 1.8 nm. The samples evolve from micro-mesoporous solid (RF-Na2CO3: combination of types I and IV isotherms) with 24.2% micropore to an exclusively microporous material (RF-NH4HCO3: type I isotherm) with 98.7% micropore. The results show that it is possible to tailor the morphology of these materials by varying the initial pH of the precursor’s solution in a narrow range and that the micropore surface area and micropore volume are independent from the initial pH, while the BET surface area vary from 582 m2/g (pH = 3.2) to 680 m2/g (pH = 6). However, as the pH increases over pH = 6 the surface area is decreases. These materials can be used as packing for separation columns or as catalysts supports.
Źródło:
World Scientific News; 2015, 13; 80-94
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Properties of Sol-Gel Derived Dip-Coated CdO Thin Film
Autorzy:
Kumari, Renu
Kumar, Vipin
Powiązania:
https://bibliotekanauki.pl/articles/1159724.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Band gap
CdO
Sol-gel dip coating
Thin film
Opis:
In this paper CdO thin film has been prepared by sol-gel dip-coating method on glass substrate. The film was characterized by X-Ray diffraction, UV-Visible spectroscopy and photoluminescence spectroscopy for structural and optical properties of CdO thin film. The XRD pattern shows that film is polycrystalline in nature and has a cubical structure with orientation along (111) plane. The diffuse reflectance spectra for the film is studied in wavelength range 400-800 nm. The direct energy band gap of 2.50 eV is found for the film using modified Kubelka-Munk function. Photoluminescence spectra shows one sharp peak at 540 nm due to oxygen vacancy of cadmium oxide.
Źródło:
World Scientific News; 2018, 113; 210-217
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of chemical pre-treatment on the polished surface of aluminium alloys
Autorzy:
Kraus, P.
Svobodova, J.
Cais, J.
Lattner, R.
Powiązania:
https://bibliotekanauki.pl/articles/957952.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
sol-gel technology
nanolayers
aluminium alloys
surface roughness
SEM
Opis:
This paper reports the preparation and characterization of thin transparent nanolayers with phase composition ZrF4 and different modification of SiO2 with special focus on affecting the surface roughness of the material and the way of exclusion of the thin nanolayer on the surface of the polished aluminium material. The thin nanolayer was prepared by the sol-gel method. The final treatment based on PTFE was applied on the surface of some samples. This treatment is suitable for increasing wear resistance. The films were characterized with help of SEM microscopy and EDS analysis. The surface roughness was measured with classical surface roughness tester. The results on this theme have already published but not on the polished surface of the aluminium material. The results from the experiment show the problems with application of these nanolayers because a cracks were found on the surface of the material and deformations of the layer after application of the PTFE final layer. The surface layer formation is discussed.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 17-23
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The structure optimization of implants materials of the surface layers by sol-gel coating
Autorzy:
Donesz, A.
Krzak-Roś, J.
Kochanowska, I.
Będziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/956590.pdf
Data publikacji:
2011
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
implant
warstwa wierzchnia
zol-żel
surface layer
sol-gel
Opis:
This work presents the synthesis of fluorine- and chlorine-doped silica thin films on stainless steel (316L) prepared by the sol–gel method. Obtained materials were examined: structurally (SEM, roughness measurements), mechanically (four-point bending test) and biologically (in vitro). The results of the tests show that it is a possibility to synthesis by sol-gel method stable, continuous and biocompatible coating for materials used for implants.
Źródło:
Aktualne Problemy Biomechaniki; 2011, 5; 25-28
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the activity of ZnO-SnO2 nanocomposite against bacteria and fungi
Autorzy:
Omar, K.
Meena, B. I.
Muhammed, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/109343.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ZnO-SnO2 nanocomposite
bacteria
fungi
sol-gel method
Opis:
ZnO-SnO2 nanocomposite was prepared by the sol-gel method. The as-prepared nanocomposite was characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM-EDX), FTIR and UV-Visible spectrometer analysis techniques. The average particle size of nanocomposite was calculated from the XRD study. The average particle size of the prepared nanocomposite was 22 nm. According to the UV-Visible spectrum, the band gap value of 5.06 eV was obtained for the ZnO-SnO2nanocomposite. From the analysis techniques it was found that the metal oxides of ZnO-SnO2 mainly consist of ZnO and SnO2 metal oxides. The antibacterial and antifungal activities of the ZnO-SnO2nanocomposite were studied against Staphylococcus aureus (ATCC25923), Listeria monocytogenes (ATCC 11994)(Gram-positive), Salmonella typhi (ATCC14028), Escherichia coli (ATCC 25922)Gram-negative), Candida albicans (ATCC10231), and Aspergillus niger (ATCC 16404) (fungi)by two methods through the turbidity method or reading optical density and inhibition zone, which were carried out in the absence of irradiation. We observed an effective antibacterial and antifungal activity of the ZnO-SnO2 nanocomposite against bacteria and fungi.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 754-766
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cd Doping on Structural and Some Optical Studies of Nano CuO Films Prepared by Sol–Gel Technique
Autorzy:
Kadhim, Raheem G.
Ban, Raheem Saleh Kzar
Powiązania:
https://bibliotekanauki.pl/articles/1182823.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cd
CuO
Sol–Gel Spin Coating Technique
Thin Film
Opis:
This research deals with the study of the structural and optical properties of CuO and Cd doped CuO nano films in thickness 100nm were deposited on a glass substrate using sol-gel spin coating technique. XRD results indicated that the films are polycrystalline and have monoclinic structure with a preferred orientation along ((111).) ̅ and the grain size increase with increasing concentration Cd. Data of AFM indicate that the surface of films is smooth. From SEM image observed the particles are smallest an even particle distribution on a smooth surface. The optical transition in the CuO and (Cd– doped CuO) thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of (Cd) for all samples.
Źródło:
World Scientific News; 2017, 64; 69-83
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Fabrication of fluoride nanocrystals and their spectroscopic properties
Autorzy:
Pawlik, N.
Szpikowska-Sroka, B.
Goryczka, T.
Pisarski, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/173278.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sol-gel method
glass-ceramics
fluoride nanocrystals
europium ions
Opis:
In this work, the fabrication of glass-ceramic materials containing MF3:Eu3++ (M = La, Gd) nanocrystals dispersed in silica sol-gel hosts has been presented. The transformation from liquid sols towards bulk samples was also examined based on IR measurements. The crystallization temperatures and formation of MF3 phases were verified based on TG/DSC analysis and XRD measurements. The optical properties of prepared Eu3+5D05D07FJ (J = 1–4) emission bands, which were recorded within the reddish-orange spectral area under near-UV illumination (λexc = 393 nm). Recorded luminescence spectra and double-exponential character of decay curves for prepared glass-ceramic samples indicated the successful migration of Eu3+ dopant ions from amorphous silica framework to low-phonon energy MF3 nanocrystal phases.
Źródło:
Optica Applicata; 2019, 49, 3; 415-426
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Post-Synthesis Microwave Plasma Treatment Effect on Magnetization and Morphology of Manganese-Iron Oxide Nanoparticles
Autorzy:
Busharat, Muhammad Aqib
Naz, Muhammad Yasin
Shukrullah, Shazia
Zahid, Muhammad
Powiązania:
https://bibliotekanauki.pl/articles/2125527.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ferrite nanoparticles
microwave discharge
sol-gel synthesis
magnetic properties
Opis:
The influence of microwave (MW) plasma on magnetization and morphology of sol-gel synthesized MnFe2O4 ferrite nanoparticles is investigated in this study. Manganese (II) nitrate hexahydrate, ferric (III) nitrate nanohydrate and citric acid were used to synthesize ferrite nanoparticles via a facile sol-gel route. These ferrite nanostructures were heat-treated at 700ºC and then given MW plasma treatment for 10 min. The pristine MnFe2O4 and plasma treated MnFe2O4 showed almost similar structural formation with a slight increase in crystallinity on plasma treatment. However, XRD peak intensity slightly increased after plasma treatment, reflecting better crystallinity of the nanostructures. The size of the particle increased from 35 nm to 39 nm on plasma treatment. It was challenging to deduce the surface morphology of the nanoparticles since both samples were composed of a mixture of big and small clusters. Clusters that had been treated with plasma were larger in size than pristine ones. The band gap energy of the pristine MnFe2O4 sample was about 5.92 eV, which increased to 6.01 eV after treatment with MW plasma. The saturation magnetization of MnFe2O4 sample was noted about 0.78 emu/g before plasma treatment and 0.68 emu/g after MW plasma treatment.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 837--842
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immobilizacja lipazy w sieci silikażelu
Lipase immobilization in a silics gel matrix
Autorzy:
Jakubiak, J.M.
Wójcik, M.J.
Powiązania:
https://bibliotekanauki.pl/articles/1207743.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
immobilizacja
silikażel
zol-żel
lipaza
TMOS
immobilization
silica gel
sol-gel
lipase
Opis:
Badano proces immobilizacji lipazy z Candida rugosa w sieci silikażelu, otrzymywanego z tetrametoksysilanu na drodze procesu zol-żel. Żelowanie przeprowadzono przy trzech stężeniach fluorku sodu, który pełnił rolę katalizatora procesu. Stwierdzono spowolnienie procesu żelowania ze zmniejszeniem stężenia katalizatora. Wykazano także niewielki wpływ wymiaru ziaren biokatalizatorów na ich aktywność oraz istotny wpływ temperatury na stabilność podczas przechowywania.
The immobilization of lipase from Candida rugosa in a matrix of silica gel obtained from tetramethoxysilane by means of a sol-gel process was investigated. Gelation was effected at three concentrations of sodium fluoride which was used as the process catalyst. It was found that the gelation process was slower for lower concentrations of the catalyst. It also was demonstrated that the grain size of the biocatalysts had a minor effect on their activity while temperature had a significant effect on their stability during storage.
Źródło:
Chemik; 2011, 65, 4; 343-346
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cost-effective titania layers over 100 nm thick : effect of annealing on the structural, morphological, and optical properties
Autorzy:
Zięba, Magdalena
Tyszkiewicz, Cuma
Gondek, Ewa
Wojtasik, Katarzyna
Nizioł, Jacek
Dorosz, Dominik
Starzyk, Bartłomiej
Szymczak, Patryk
Pakieła, Wojciech
Rogoziński, Roman
Karasiński, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/27315694.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
sol-gel
titania layer
dip-coating
surface roughness
optical properties
Opis:
Titania dioxide (TiO₂) layers were synthesized via the acid-catalysed sol-gel route using titania (IV) ethoxide, and then annealed at temperatures varying in the range of 150-700 °C. The research concerned the effect of annealing temperature on the structure of TiO₂ layers, their surface morphology, and their optical properties. Further, X-ray diffractometry, and Raman spectroscopy were used to determine the structure of TiO₂ layers. Scanning electron and atomic force microscopy were used to study the surface morphology of TiO₂ layers. Transmittance, reflectance, absorption edge, and optical homogeneity were investigated by UV-VIS spectrophotometry, while the refractive index and thicknesses of TiO₂ layers were measured using a monochromatic ellipsometer. Chromatic dispersion characteristics of the complex refractive index were determined using spectroscopic ellipsometry. Structural studies have shown that the TiO₂ layers annealed at temperatures up to 300 °C are amorphous, while those annealed at temperatures exceeding 300 °C are polycrystalline containing only anatase nanocrystals with sizes increasing from 6 to 20 nm with the increase of the annealing temperature. Investigations on the surface morphology of TiO₂ layers have shown that the surface roughness increases with the increase in annealing temperature. Spectrophotometric investigations have shown that TiO₂ layers are homogeneous and the width of the indirect optical band gap varies with annealing temperature from 3.53 eV to 3.73 eV.
Źródło:
Opto-Electronics Review; 2023, 31, 4; art. no. e147913
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ chropowatości podłoża na topografię warstw TiO2 i SiO2 nakładanych metodą zol-żel
Influence of substrate roughness on TiO2 and SiO2 coating topography coated by funcional sol-gel derived layers
Autorzy:
Będziński, R.
Filipiak, J.
Pezowicz, C.
Krzak-Roś, J.
Kowalski, M.
Powiązania:
https://bibliotekanauki.pl/articles/285966.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
implanty
ortopedia
metoda zol-żel
implants
orthopaedics
sol-gel method
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 87-89
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perspektywy zastosowań technologii zol-żel w zakresie wytwarzania powłok przeznaczonych na pokrycia implantów
The perspective of sol-gel technology in the development of coatings on medical implants
Autorzy:
Grygier, D.
Dudziński, W.
Rutkowska-Gorczyca, M.
Powiązania:
https://bibliotekanauki.pl/articles/970897.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
implanty
technologia zol-żel
powłoki
implants
sol-gel technology
coatings
Źródło:
Engineering of Biomaterials; 2010, 13, no. 96-98; 21-24
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microspheres and Pellets of UO2 Prepared Via ADU by Complex Sol-Gel Process and ICHTJ Process
Autorzy:
Brykala, M.
Rogowski, M.
Wawszczak, D.
Olczak, T.
Smolinski, T.
Powiązania:
https://bibliotekanauki.pl/articles/357030.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
uranium dioxide
microspheres
pellets
Complex Sol-Gel Process
ICHTJ Process
Opis:
This study is devoted to synthesis and characterization of uranium dioxide microspheres (Ø < 100 μm) and pellets by application of powder-free process called the Complex Sol-Gel Process. The precursors of prepared sols were ascorbic acid solution with dissolved a freshly precipitated ammonium diuranate. The microspheres of uranyl-ascorbate gel were obtained using the ICHTJ Process. The pellets were formed by pressing and sintering of uranium dioxide powder. Studies allowed determining an optimal heat treatment of calcination, reduction and sintering processes at temperatures of 700°C, 900°C and 1300°C, respectively. The main parameters which play a key role in the process of synthesis method and features of the pellets and microspheres of uranium dioxide are described in this article.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1397-1404
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of the Properties of Ti6Al7Nb Titanium Alloy in Terms of the Type of Surface Modification
Autorzy:
Woźniak, A.
Bialas, O.
Adamiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/353294.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium alloys
sol-gel method
ZrO2 coating
EIS
AFM
Opis:
The paper presents the influence of ZrO2 coating on Ti6Al7Nb titanium alloy depending on the method of deposition. The coatings were made by sol-gel method and atomic layer deposition (ALD). Wettability tests, pitting corrosion assessment and electrochemical impedance spectroscopy (EIS) were carried out in the paper. Complementary macro- and microscopic observations, roughness analysis by profilometric method and atomic force microscopy (AFM) were made. Based on the results obtained, it can be concluded that the type of method of depositing the layer on the surface of the material has a significant influence on its properties and that it should be taken into account during the process of the material improvement. Drawing on the findings presented, it can be inferred that roughness has a significant impact upon the surface wetttability of the tested surfaces and their related corrosion resistance. The obtainment of hydrophobic surfaces is for smaller rougidity values.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 735-741
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Salt and precipitating agent effect on the specific surface area and compressive strength of alumina catalyst support
Autorzy:
Mahmoudian, M.
Hemmati, A.
Hashemabadi, H.
Ghaemi, A.
Shahhosseini, S.
Powiązania:
https://bibliotekanauki.pl/articles/778022.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Alumina
Catalyst Support
Sol Gel
Specific Surface Area
compressive strength
Opis:
Nowadays, catalyst supports are extensively used to decrease the costs and increase the contact surface area in chemical reactions. Specific surface area, compressive strength, pore volume and pore size are some of the most important characteristics of a catalyst support. In this work, Sol-gel and peptization methods were applied to produce alumina catalyst support. Also the roles of aluminum salts and precipitating agents on the specific surface area and compressive strength of alumina catalyst support were investigated. In addition, various additives and common methods in the increasing surface area, compressive strength and adjusting the porosity and pore size are used in this study. The results show that using caustic soda as precipitating agent and aluminum chloride salt yields catalyst supports with the best compressive strength. Also, using aluminum nitrate and ammonia as precipitating agent produced alumina catalyst support with the highest specific surface area.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 3; 35-40
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of Sol-Gel Derived Hydroxyapatite Enhanced with Silver Nanoparticles using OCT and Raman Spectroscopy
Autorzy:
Głowacki, M. J.
Gnyba, M.
Strąkowska, P.
Gardas, M.
Kraszewski, M.
Trojanowski, M.
Strąkowski, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/221475.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydroxyapatite
sol-gel
nanoparticles
Raman spectroscopy
optical coherence tomography (OCT)
Opis:
Hydroxyapatite (HAp) has been attracting widespread interest in medical applications. In a form of coating, it enables to create a durable bond between an implant and surrounding bone tissues. With addition of silver nanoparticles HAp should also provide antibacterial activity. The aim of this research was to evaluate the composition of hydroxyapatite with silver nanoparticles in a non-destructive and non-contact way. For control measurements of HAp molecular composition and solvent evaporation efficiency the Raman spectroscopy has been chosen. In order to evaluate dispersion and concentration of the silver nanoparticles inside the hydroxyapatite matrix, the optical coherence tomography (OCT) has been used. Five samples were developed and examined ‒ a reference sample of pure HAp sol and four samples of HAp colloids with different silver nanoparticle solution volume ratios. The Raman spectra for each solution have been obtained and analyzed. Furthermore, a transverse-sectional visualization of every sample has been created and examined by means of OCT.
Źródło:
Metrology and Measurement Systems; 2017, 24, 1; 153-160
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wspomagana plazmowo metoda wytwarzania powłok ceramicznych z aerozolu
Plasma enhanced aerosolgel deposition of ceramic coatings
Autorzy:
Pietrzyk, B.
Miszczak, S.
Szymanowski, H.
Gawroński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/970910.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
powłoki ceramiczne
aerozol
metoda sol-żel
ceramic coatings
aerosol
sol-gel method
Źródło:
Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 24-26
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fractal Features and Structural, Morphological, Optical Characteristics of Sol-Gel Derived Silica Nanoparticled Thin Films
Autorzy:
Uysal, B.
Pekcan, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1029990.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
fractal dimension
silica
sol-gel method
size-dependence
thin films
Opis:
Nanostructured silica films using a simple and effective sol-gel spin coating technique were synthesized and the influence of ammonia/sol ratios on the particle size and thickness of this film was investigated. In addition, fractal dimensions of the prepared films were determined using the scattering response technique. The samples were characterized by atomic force microscopy and UV-vis spectroscopy. Comparing optical method and image analysis of atomic force microscopy micrographs, the fractal dimension of silica nanoparticled thin films was determined. The fractal dimensions of the films verified by atomic force microscopy analysis were found to be around 2.03 which is very close to the values (2.0358, 2.0325, and 2.0335) obtained using optical method. As a result of these findings, precise determination of the nanoparticled silica thin films fractal dimension using both optical and surface analysis methods was realized.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1160-1164
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and structural characterization of niobium-doped hydroxyapatite ceramics
Autorzy:
Korzeniewski, Wojciech
Witkowska, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/284989.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
structure
nanoceramics
sol-gel method
hydroxyapatite
niobium
mechano-chemical synthesis
Opis:
Hydroxyapatite (HAp) ceramic materials are consi-dered as one of the most promising implant materials in bone surgery and in dentistry. They exhibit unique biocompatibility, bioactivity, and osteoconductivity, which are the most desirable biomaterial features. However, HAp itself is brittle, has low strength, high degree of crystallinity and low solubility at physiological pH. Doping synthetic HAp with metal ions plays an important role in improving its structural and physico--chemical properties. HAp doped with niobium ions has not been widely investigated so far. However, the results of studies available in the literature show that the synthesized CaO-P2O5-Nb2O5 compounds still show good biocompatibility, very low cytotoxicity and, additionally, they stimulate osteoblast proliferation. Therefore, this study is dedicated to the niobium--doped HAp ceramics obtained by two methods: mechano-chemical synthesis and sol-gel method. Bioceramics chemical composition, morphology, and structure were characterized by means of scanning electron microscopy imaging, BET method, X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results indicate that nanoceramics of non-stoichiometric HAp with a clear Ca deficiency on the nanograin surface were obtained. Moreover, it has been observed that the presence of Nb dopants and the synthesis method directly affect unit cell parameters, crystallinity degree, crystallites size, porosity and distribution of niobium in the grain structure. Mechano-chemical synthesis has allowed effective niobium incorporation into the HAp structure, leading to the quite homogeneous Nb distribution in the grain volume. Whereas, Nb-doping by sol-gel method has led to dopants location mainly on the grain surface.
Źródło:
Engineering of Biomaterials; 2019, 22, 150; 10-15
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury wygrzewania warstw TiO2 otrzymanych metodą zol-żel na właściwości korozyjne biomedycznego stopu Panacea P558
The influence of heating temperature of TiO2 sol-gel layers on corrosion properties of Panacea P558 biomedical alloy
Autorzy:
Burnat, B.
Błaszczyk, T.
Scholl, H.
Powiązania:
https://bibliotekanauki.pl/articles/284382.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
korozja
biomateriały
metoda zol-żel
corrosion
biomaterials
sol-gel method
Opis:
Zbadano wpływ temperatury wygrzewania warstw TiO2 uzyskanych metodą zol-żel na właściwości korozyjne bezniklowego stopu biomedycznego Panacea P558. Próbki stopu z naniesioną warstwą TiO2 jak też próbki bez tych warstw były poddane wygrzewaniu w temperaturach 4500 C i 8000 C. Badania korozyjne wykonano w odtlenionym roztworze Tyrode’a w temperaturze ciała ludzkiego 370 C (310K). Stwierdzono polepszenie właściwości korozyjnych stopu przez warstwy wygrzane w temperaturze 4500 C. Stwierdzono również, że wygrzanie tego stopu w temperaturze 8000 C powoduje dużą niestabilność jego właściwości korozyjnych - po pewnym czasie ekspozycji w roztworze korozyjnym próbki bez warstw jak i z warstwami TiO2 skokowo zmieniają swoje właściwości i charakteryzują się gorszymi parametrami korozyjnymi niż wyjściowy stop. Przyczyną pogorszenia właściwości korozyjnych stopu Panacea P558 w temperaturze 8000 C mogą być (1) zmiany w strukturze wewnętrznej tego stopu (segregacja składników stopu) jak też (2) powstające w tej temperaturze węgliki metali będących składnikami stopu.
The influence of heating temperature of TiO2 sol-gel layers on corrosion properties of nickel-free Panacea P558 biomedical alloy was investigated. The samples of alloy both with TiO2 sol-gel layers and without the-se layers were heated at temperature of 4500 C and 8000 C. The investigations were carried out in deoxy-genated Tyrode’s solution at human body temperature of 370 C (310K). It was found that the layers heated at 4500 C improve corrosion features of this alloy. It was also stated that heat treatment of this alloy at 8000 C results in high instability of its corrosion features - after some exposition time in corrosion solution samples both without and with TiO2layers rapidly change their properties and these samples have worse corrosion parameters than initial alloy (without any surface modification). The reason for these worse corrosion features of Panacea P558 alloy heated at 8000 C may be: (1) changes of its microstructure (segregation of alloy components) and (2) alloying elements carbides formed at this temperature.
Źródło:
Engineering of Biomaterials; 2009, 12, no. 89-91; 61-65
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface properties of the doped silica hydrophobic coatings deposited on plasma activated glass supports
Autorzy:
Chodkowski, Michał
Terpiłowski, Konrad
Goncharuk, Olena
Powiązania:
https://bibliotekanauki.pl/articles/110289.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrophobicity
surface chemistry
glass
silica
sol-gel method
immersion
plasma
Opis:
The paper discusses preparation and characteristics of silica hydrophobic layers deposited on the plasma-modified glass supports. The surfaces were investigated using wettability measurements, profilometry, photoacoustic and infrared spectroscopy, X-ray photoelectron spectroscopy as well as scanning electron microscopy. The wettability measurements showed that the obtained surfaces are hydrophobic – the water contact angle was in the range of 140-150 degrees. The photoacoustic and infrared spectroscopy as well as X-ray photoelectron spectroscopy disclosed the surface compositions, particularly that of the hydrophobic alkyl groups deposited on them. They were methyl groups introduced during hydrophobization by hexamethyldisilazane. In addition, it was found that the number of groups on the surface depends on the kind of plasma by which the supports were activated. The optical profilometer showed differences in the surface roughness which affects their hydrophobicity. Moreover, the surface free energies were determined using the contact angle hysteresis method. They disclosed differences in each surface, depending on the way of supports activation. The largest hydrophobicity was obtained on the layer deposited on the support activated by the argon plasma. However, support activation by the air plasma resulted in a decrease of hydrophobicity compared to that of the non-activated surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1450-1459
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterization of ZnO-Zeolite Nanocomposite for Photocatalytic Degradation by Ultraviolet Light
Autorzy:
Gayatri, Rianyza
Agustina, Tuty Emilia
Bahrin, David
Moeksin, Rosdiana
Gustini, Gustini
Powiązania:
https://bibliotekanauki.pl/articles/1838249.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
nanocomposite
ZnO
synthetic zeolite
sol-gel
photocatalytic degradation
procion red
Opis:
The increasing growth of the textile industry does not only provide benefits in the economic sector but also has the potential to damage the environment, because it generates the dye wastewater which is hard to eliminate. Procion red is one of the synthetic textile dyes that is toxic to the aquatic environment and it needs to be processed properly. The photocatalytic method of processing dye wastewater is the most effective, because it can remove the harmful pollutants in the dye wastewater. This study aimed to prepare and characterize the ZnO-Zeolite nanocomposites for photocatalytic applications tested with a 50 mg/L procion red dye sample. The nanocomposites consisted of the ZnO semiconductors and synthetic zeolite adsorbents prepared by using the sol-gel method. The dye degradation test was carried out under the irradiation conditions with ultraviolet (UV) lamp. Apart from the ZnO-Zeolite nanocomposite, testing was also carried out with the synthetic zeolite and ZnO. The results of SEM-EDX and XRD characterization proved that the nanocomposite forming components were ZnO and zeolite and could be seen from the resulting peaks. BET showed that the surface area value of the ZnO-Zeolite nanocomposite increased to 95.98 m2/g, the pore size of the ZnO-Zeolite nanocomposite was 4.42 nm, and the total pore volume was 0.08 cm3/g. The obtained average crystalline size of ZnO-Zeolite nanocomposite was 32.87 nm. The percentage of dye degradation using the ZnO-Zeolite nanocomposite for 120 minutes has reached 90.42%.
Źródło:
Journal of Ecological Engineering; 2021, 22, 2; 178-186
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of (Nia-Znb)X Cu1-X Ferrite Nanoparticle Fabricated by Sol-Gel Process
Autorzy:
Yang, S.
Kim, J.-G.
Powiązania:
https://bibliotekanauki.pl/articles/352091.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ni-Zn-Cu ferrite
nanoparticle
soft magnetic property
sol-gel
Opis:
In future, more mobile devices with different frequencies will be used at the same time. Therefore, it is expected that the trouble caused by wave interference between devices will be further intensified. In order to prevent this trouble, investigation of selective frequency transmission or absorption material is required. In this paper, magnetic properties of nickel-zinc-copper ferrite nano powder was researched as wave absorber. (Nia-Znb)xCu1-xFe2O4(NZCF) nanoparticles were fabricated by the sol-gel method. The influence of copper substitution on lattice parameter change was analyzed by X-ray diffraction (XRD), particle size was analyzed by scanning electron microscopy (SEM), and Magnetic properties analyzed by vibrating sample magnetometer (VSM). The NZCF and Nickel-zinc ferrite (NZF) lattice parameter difference was 0.028 Å and particle size was calculated as 30 nm with the XRD peak. The VSM results of (Ni0.3-Zn0.3)0.6Cu1-0.6Fe2O4 annealed sample at 700°C for 3hous were 58.5 emu/g (Ms), 22.8 Oe (Hc). It was the most suitable magnetic properties for wave absorber in this investigation.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1197-1200
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Ceramic Coating on Mechanical Properties of Stainless Steel
Autorzy:
Czekaj, D.
Lisińska-Czekaj, A.
Krzysztofowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/353220.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stainless steel
X-ray analysis
microhardness
sol-gel ceramic coating
Opis:
Crystal structure and phase composition of stainless steel substrates (AISI 304 type) was studied and it was found that they adopted the cubic symmetry. The calculated elementary cell parameter for the mayor Fe-Ni phase (weight fraction 99%) was a = 3.593 Å, whereas the mean grain size was = 2932 Å. Morphology of the stainless steel substrate surface was studied with profilometry. Mechanical properties of the stainless steel substrates and stainless steel substrates coated with ceramic layer of barium strontium titanate were studied with microhardness tester. For measurements performed according to the Vickers method the average microhardness was found HV = 189 or HV = 186 for the “in-line” and “mapping” measurement pattern, respectively. The sol-gel method was used to coat the surface of the stainless steel substrate with a thin ceramic layer of the chemical composition Ba0.6 Sr0.4 TiO3 . It was found that the stainless steel substrate covered with sol-gel deposited ceramic coating exhibited the average hardness within the range HV = 217 up to HV = 235 for loading force F = 98 mN and F = 0.98 N, respectively. The Knopp method was also used and it was found that the stainless steel substrate with Ba0.6 Sr0.4 TiO3 coating exhibited hardness HK = 386.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 911-916
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the sol-gel method at the fabrication of PLZT:Yb3+ ceramics
Autorzy:
Osińska, K.
Płońska, M.
Marzec, A.
Powiązania:
https://bibliotekanauki.pl/articles/353490.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PLZT:Yb3+ ceramics
sol-gel method
perovskite structure ceramics
Opis:
The aim of presented study was to obtain the PLZT:Yb ceramics. Nanopowders of itterbiuni doped PLZT materials were synthesized by the sol-gel method from high quality metaloorganic precursors, as lead (II) acetate, lanthanum acetate, ytterbium acetate, zirconium (IV) propoxide and titanium (IV) propoxide. Anhydrous acetic acid and n-propyl alcohol were used as solvents, while acetyloacetone was added as stabilizer of hydrolysis reactions. Thermal evolution of the dried gels, before and after calcination, was studied by the simultaneous thermal analysis. The amorphous PLZT:Yb3+ gels were first calcined in the furnace at T = 850°C, and then mixed in the planetary ball mill. Additionally, the mean particle sizes were calculated by means of powder specific surface area measurements, based on the BET physical adsorption isotherm. Such obtained powders were subsequently pressed into pellets, and sintered by the free sintering method at temperature T= 1250°C / 6h. The morphology of fabricated PLZT:Yb:3+ ceramic powders and samples was studied using Scanning Electron Microscopy. Chemical characterization of samples was carried on using the Energy-dispersive X-ray spectroscopy – EDS system. Studies provided detailed data concerning die relationships between doping and preparing conditions on the basic physical and chemical properties of obtained ceramic materials.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1441-1446
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Effect of Er³⁺ Ions Embedded in Smart Nano-Composite Oxide Material Prepared by Sol-Gel Technique
Autorzy:
Battisha, I.
Ayoub, M.
Hashem, A.
Ahmed, E.
Amin, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032584.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
photonics
sol-gel
erbium ions
XRD
FESEM
HRTEM
optical refractive index
Opis:
The phosphosilicate for planar waveguides fabrication by using sol-gel, and particularly erbium-doped waveguide amplifiers, is reviewed. In particular, efforts to use sol-gel to improve molecular homogeneity in Er-doped phosphosilicate-based monolith and thin films will be discussed. A variety of material studies was carried out to investigate and optimize the sample preparation condition for such application. These include X-ray diffraction, the Fourier transform infrared and optical transmittance, absorption and refractive index calculation. The erbium nitrate precursors use is shown to alter the Er³⁺ ions doping in the prepared samples thermally treated in the final monolith glass form, in comparison to the use of thin film phosphosilicate sol-gel sample. Excess heat treatment is used to force prepared samples crystallization, moreover resulting photoluminescence analysis is used to detect the co-operative-up-conversion sample properties before and after heating.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1277-1283
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Properties of CuO Doped (Li) Thin Films Prepared by Sol-Gel Technique
Autorzy:
Kadhim, Raheem G.
Kzar, Kzar
Powiązania:
https://bibliotekanauki.pl/articles/1188084.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CuO
Li
Sol-gel
spin coating
x-ray diffraction
UV- Visible
Opis:
CuO and (Li–doped CuO) thin films have been prepared on glass substrates by sol-gel method using spin coating technique. X-ray diffraction (XRD) results reveal that the deposited CuO and (Li– doped CuO) thin films monoclinic crystal structure and the grain size increase with increasing concentration Li. The optical transition in the CuO and (Li– doped CuO) thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of (Li) for all samples.
Źródło:
World Scientific News; 2016, 56; 56-66
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immobilizacja lipazy metodą zol-żel
Immobilization of lipase by sol-gel method
Autorzy:
Kmiecik, J.
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/2070380.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
immobilizacja
lipaza
zol-żel
biokatalizator
TMOS
immobilization
lipase
sol-gel
biocatalyst
Opis:
Badano immobilizację lipazy z Candida rugosa metodą zol-żel. Puła-kowanie enzymu w żelu wykonano używając tetrametoksysilanu i fluorku sodu. Magnetyt dodawano, aby umożliwić separację biokatalizatora. Aktywność lipazy określano spektrofotometrycznie. Stwierdzono, że biokatalizator może być stosowany wielokrotnie w operacjach okresowych. Potwierdzono także długookresową stabilność biokatalizatora podczas przechowywania.
Immobilization of lipase from Candida rugosa by sol-gel method was studied. The gel-entrapped lipase was prepared by using tetramet-hoxysilane and sodium fluoride. Magnetite was added to enable separation of biocatalyst from reaction mixture. Activities of lipase were determined spectrophotometrically. It was found that the biocatalyst can be used many times in batch operations. Long-term storage stability of biocatalyst was also confirmed.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 3; 61-62
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wear and friction behaviour of alumina thin coatings prepared by sol-gel methods
Właściwości tarciowe i zużyciowe powłok tlenku glinu wytwarzanych metodą zol-żel
Autorzy:
Neska-Bakus, P.
Piwoński, I.
Powiązania:
https://bibliotekanauki.pl/articles/190219.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
tlenek glinu
metoda zol-żel
zużycie
alumina
sol-gel method
wear
Opis:
In this study, alumina coatings were prepared by the sol-gel method using the dip-coating technique. All samples were prepared on silicon wafers Si (100) with the use of aluminium sec-butoxide as a precursor. The surface topographies of alumina coatings were imaged by an atomic force microscope (AFM). Tribological properties were characterised using a microtribometer and an optical microscope. The results show a strong dependence of antiwear and antifrictional properties of alumina coatings on the annealing temperatures. The best performance was exhibited by coatings heated to 1000°C due to the formation of hard alfa-Al2O3.
Badane powłoki tlenku glinu zostały otrzymane w oparciu o metodę zol-żel z wykorzystaniem techniki zanurzeniowej (dip-coating). Na powierzchnie płytek krzemowych nanoszono roztwory prekursora, którym był sec-butoksyglin. Analizę topografii powierzchni wytworzonych powłok tlenku glinu przeprowadzono z wykorzystaniem Mikroskopu Sił Atomowych (AFM). Właściwości tribologiczne zostały scharakteryzowane z użyciem mikrotribometru (T-23) i mikroskopu optycznego. Uzyskane wyniki wskazały istnienie zależności między właściwościami przeciwtarciowymi i przeciwzużyciowymi powłok tlenku glinu a temperaturą wygrzewania próbek. Najlepsze właściwości wykazały powłoki wygrzewane w 1000°C, co spowodowane jest obecnością fazy alfa-Al2O3.
Źródło:
Tribologia; 2011, 1; 117-124
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary characteristic of composite coatings C/HAp produced respectively by RF PACDV and sol-gel methods
Wstępna charakterystyka kompozytowych powłok C/HAp wytworzonych odpowiednio metodami RF PACVD oraz zol-żel
Autorzy:
Gawroński, J.
Pietrzyk, B.
Powiązania:
https://bibliotekanauki.pl/articles/351780.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydroxyapatite
sol-gel
adhesion
carbon
implant
hydroksyapatyt
zol-żel
przyczepność
węgiel
Opis:
The required high mechanical strength and the reliability of implants on one side and a lack of toxic elements in those materials, on the other side, causes restrictions in use of metal alloys for austenitic steel, alloys of cobalt matrix and even titanium alloys. However, elements harmful to human body structure such as chromium, nickel and vanadium could not have been eliminated so far. An attempt to reduce detrimental effects of above elements on the living organism are surface modifications of materials predicted for implants through the deposition of protective layers. The C/HAp composite coating was prerared by deposition of carbon layer directly on surgical steel with RF PACVD method and manufacturing of hydroxyapatite layer by sol-gel method. It was proved that carbon film significantly increases adhesion of the composite C/HAp coating. It is due to the diffusive character of bonding between carbon layer and metallic substrate not only by adhesion as in the case with hydroxyapatite deposited directly on metal base. Adhesion of both synthesized coatings was determined using nanoindentation technique. X-Ray diffraction was used for phase composition evaluation. Atomic Force Microscope revealed topography of raw, carbon and C/HAp surfaces. Elemental composition of carbon and composite layers was investigated by scanning electron microscope equipped with x-ray energy dispersive spectroscopy detector.
Wymagana wysoka wytrzymałość mechaniczna i niezawodność implantów z jednej strony i nie stosowanie w materiałach pierwiastków toksycznych (alergizujących) z drugiej strony, powoduje ograniczenia w stosowaniu stopów metalicznych, przeznaczonych na implanty, do stali austenitycznej, stopów na osnowie kobaltu i stopów tytanu. Mimo starań, nie udało się jednak z materiałów tych całkowicie wyeliminowac pierwiatków szkodliwych dla organizmu jak choćby chromu, niklu i wanadu. Próbą ograniczenia złego wpływu pierwiastków na żywy organizm są modyfikacje powierzchni materiałów przeznaczonych na implanty poprzez wytwarzanie na nich warstw ochronnych. Kompozytowa powłoka węgiel/hydroxyapatyt została otrzymana przez naniesienie w pierwszej kolejności warstwy węglowej bezpośrednio na stal AISI 316L metodą RF PACVD a następnie warstwy hydroxyapatytu metodą zol-żel. Zostało udowodnione, że warstwa węglowa w sposób znaczący zwiększa adhezje kompozytu C/HAp do zastosowanego podłoża. Jest to wynikiem dyfuzyjnego charakteru połączenia pomiędzy warstwą węglową a podłożem a nie jak w przypadku bezpośredniego naniesienia powłoki HAp na podłoże gdzie połączenie takie ma charakter adhezyjny. Adhezja obu wytworzonych powłok (C, C/HAp) została określona po użyciu nanoindentera F-MY MTS Instruments Nano G-200 metodą scratch test. Analizę składu fazowego podłoża oraz uzyskanej powłoki kompozytowej dokonano metodą dyfrakcji rentgenowskiej. Badania topografii powierzchni z wytworzonymi warstwami węglową oraz węglowo/hydroxyapatytowa przeprowadzono przy użyciu mikroskopu sił atomowych (AFM) F-my Veeco Multimode z kontrolerem NanoScoper. Chropowatość warstwy wierzchniej określono przy pomocy parametru Ra. Mikroanalizę rentgenowską wykonano przy pomocy przystawki Thermo-Noran zainstalowanej w mikroskopie scaningowym HITACHI S-3000N. Zastosowano technikę analizy liniowej (EDS).
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 2; 569-572
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physicochemical Properties of Oxide ZrO2 Layer Deposited by Sol-Gel Method on Ti-6Al-7Nb Alloy
Autorzy:
Woźniak, A.
Ziębowicz, B.
Ziębowicz, A.
Walke, W.
Powiązania:
https://bibliotekanauki.pl/articles/353184.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Titanium alloy
Sol-gel method
ZrO2 layer
Corrosion test
AFM
Opis:
The paper contains the results of the initial surface treatment influence on the properties of the medical Ti-6Al-7Nb alloy with a modified zirconium oxide layer deposited on its surface by sol-gel method. In the paper, the analysis of results of potentiodynamic studies is presented as well as its resistance to pitting corrosion and electrochemical impedance spectroscopy (EIS), macroscopic observation of the surface of samples and analysis of geometrical structure with the use Atomic Force Microscope (AFM) were performed. The studies were performed on two groups of samples depending on the graduation of the sand used in sandblasted process – 50 μm and 250 μm. Based on the obtained results it can be concluded that the type of the initial surface treatment preceding the surface modification of the Ti-6Al-7Nb has a significant effect on its properties.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1209-1215
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of GZO/IZO Dual-Layer as an Electron Transport Layer in Dye-Sensitized Solar Cell
Autorzy:
Manzari Tavakoli, M. H.
Ahmadi, M.
Sabet, M.
Powiązania:
https://bibliotekanauki.pl/articles/353232.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dual-layer
sol-gel
spin coating
thin film
GIZO
solar cell
Opis:
GZO/IZO semiconductor thin films were prepared on the ITO substrate via sol-gel spin coating method for using in the dye-sensitized solar cells (DSSCs). For this purpose, GZO and IZO thin films were optimized by the percentage of doping gallium and indium in zinc oxide and were studied their electrical, optical and structural properties. After that, the layers with the best performance were selected for use in the DSSCs. The concentration of all solutions for spin coating processes was 0.1 M and zinc oxide has been doped with gallium and indium, with different doping percentages (0, 0.5, 1, 2 and 4 volume percentage). So, by studying the properties of the fabricated thin films, it was found the films with 0.5%GZO and 0.5%IZO have the best performance and hence, the optimized dual-layer (0.5% GZO/0.5% IZO (GIZO)) were prepared and studied their electrical and optical properties. The synthesized optimized dual-layer film was successfully used as the working electrode for dye-sensitized solar cells. The sample with 0.5%IZO shows the 9.1 mA/cm2 short-circuit current density, 0.52 V open circuit voltage, 63% fill factor and 2.98% efficiency.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1609-1614
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Pt/Al2O3 catalysts produced by sol-gel process to uranyl ion reduction
Autorzy:
Deptuła, A.
Łada, W.
Olczak, T.
Chmielewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/146103.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
sol-gel
Pt/Al2O3 catalysts
uranyl ion reduction
Opis:
Various kinds of active alumina supports were obtained by the Institute of Nuclear Chemistry and Technology (INCT) sol-gel process in the following steps: (1) preparation of alumina sols by extraction of nitrates with Primene JMT from aluminium nitrate solution; (2) gelation to spherical particles (with diameter < 100 žm) by extraction of water from sol emulsion in 2-ethyl-1-hexanol; (3) sometimes conversion of NO3 - stabilized gel to OH- form by reaction with ammonia; (4) calcination of gels to ?-Al2O3 with specific surface area > 100 m2/g at 500°C. The powders were then impregnated with chloroplatinic acid and recalcined at 500°C. Catalysts were also prepared by direct gelation of alumina sol containing hydroplatinic acid followed by steps (3) and (4). Pt/Al2O3 catalysts were used for the reduction of 1M UO2(NO3)2 - 0.5M HCOOH solution with hydrogen at atmospheric pressure. The course of the reduction was controlled analytically and by measuring the U(VI)/U(IV) redox potential. It was concluded that the catalysts obtained by impregnation of the supports prepared from nitrate stabilized gels exhibit the best activity and stability.
Źródło:
Nukleonika; 2006, 51,suppl.1; 79-82
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbonization of solid uranyl-ascorbate gel as an indirect step of uranium carbide synthesis
Autorzy:
Brykala, M.
Rogowski, M.
Olczak, T.
Powiązania:
https://bibliotekanauki.pl/articles/147109.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
carbonization
complex sol-gel process (CSGP)
uranium carbide
uranyl-ascorbate complex
Opis:
The studies of the synthesis of uranium carbide from uranyl-ascorbate gels using the complex sol-gel process (CSGP) have been carried out. The synthesis of uranyl-ascorbate mixture as liquid sol from uranium trioxide and ascorbic acid and solid gel by extraction of water from sol were carefully examined. Ascorbic acid was used as a complexing agent in complex sol-gel process and as a carbon source. The crucial step to obtain final uranium carbides from the aforementioned substrates is the carbonization process. The thermal behavior of ascorbic acid and uranyl-ascorbate gels in a nitrogen atmosphere in the temperature range of 25–900°C were investigated using TG-DTG. Furthermore, the products of the carbonization of uranyl-ascorbate gels in nitrogen, argon and vacuum atmosphere were identifi ed by X-ray diffraction. TG-DTG was used also as a method for determining of carbon residues in the samples.
Źródło:
Nukleonika; 2015, 60, No. 4, part 2; 921-925
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies