Literatura científica selecionada sobre o tema "Tungsten oxide gel"
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Artigos de revistas sobre o assunto "Tungsten oxide gel"
Zhang, Zeng Hai, Guang Ming Wu, Guo Hua Gao, Wei Feng, Xiao Bo Jin e Jun Shen. "Structural Study of WO3 and MoO3 Compound Films in H2 Gasochromism". Key Engineering Materials 537 (janeiro de 2013): 184–88. http://dx.doi.org/10.4028/www.scientific.net/kem.537.184.
Texto completo da fonteKim, Chang Yeoul, Seong Geun Cho, Seok Park, Tae Yeoung Lim e Duck Kyun Choi. "Electrochemical and Optical Properties of WO3 Prepared by Sol-Gel Coating". Materials Science Forum 544-545 (maio de 2007): 1081–84. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.1081.
Texto completo da fonteMushtaq, Khizar, Pui May Chou e Chin Wei Lai. "Review on the Synthesis Methods of Nano-Tungsten Oxide Dihydrate Colloid". MATEC Web of Conferences 335 (2021): 03008. http://dx.doi.org/10.1051/matecconf/202133503008.
Texto completo da fonteÖzkan, E., e F. Z. Tepehan. "Optical and structural characteristics of sol–gel-deposited tungsten oxide and vanadium-doped tungsten oxide films". Solar Energy Materials and Solar Cells 68, n.º 3-4 (junho de 2001): 265–77. http://dx.doi.org/10.1016/s0927-0248(00)00361-5.
Texto completo da fonteSantos Garcia, Irene Teresinha, e Diego Soares de Moura. "Sodium tetratungstate/tungsten oxide films prepared with dodecyltrimethylammonium chloride as structuring agent". Revista Eletrônica Científica da UERGS 8, n.º 3 (23 de dezembro de 2022): 218–27. http://dx.doi.org/10.21674/2448-0479.83.218-227.
Texto completo da fonteChai, Y., F. Y. Ha, F. K. Yam e Z. Hassan. "Fabrication of Tungsten Oxide Nanostructure by Sol-Gel Method". Procedia Chemistry 19 (2016): 113–18. http://dx.doi.org/10.1016/j.proche.2016.03.123.
Texto completo da fonteVidmar, Tjaša, Marko Topič, Petr Dzik e Urša Opara Krašovec. "Inkjet printing of sol–gel derived tungsten oxide inks". Solar Energy Materials and Solar Cells 125 (junho de 2014): 87–95. http://dx.doi.org/10.1016/j.solmat.2014.02.023.
Texto completo da fonteBaker, A. P., S. N. B. Hodgson e M. J. Edirisinghe. "Production of tungsten oxide coatings, via sol–gel processing of tungsten anion solutions". Surface and Coatings Technology 153, n.º 2-3 (abril de 2002): 184–93. http://dx.doi.org/10.1016/s0257-8972(01)01673-5.
Texto completo da fonteDulgerbaki, Cigdem, Aliihsan Komur e Aysegul Uygun Oksuz. "Tungsten Oxide Nanofibers for Electrochromic Device Application". Academic Perspective Procedia 1, n.º 1 (9 de novembro de 2018): 902–10. http://dx.doi.org/10.33793/acperpro.01.01.152.
Texto completo da fontePasserini, Stefano, Bruno Scrosati, Vincent Hermann, CarolAnn Holmblad e Terese Bartlett. "Laminated Electrochromic Windows Based on Nickel Oxide, Tungsten Oxide, and Gel Electrolytes". Journal of The Electrochemical Society 141, n.º 4 (1 de abril de 1994): 1025–28. http://dx.doi.org/10.1149/1.2054835.
Texto completo da fonteTeses / dissertações sobre o assunto "Tungsten oxide gel"
Isik, Dilek. "Sol-gel Derived Tungsten Oxide Based Electrochromic Coatings". Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12609686/index.pdf.
Texto completo da fonteacetylated peroxotungstic acid (APTA), peroxotungstic acid (PTA) and titanium-doped peroxotungstic acid (Ti-PTA) were employed to obtain 200-300 nm thick multi-layered coatings. Material and electrochromic characterization of the coatings have been performed by DSC, XRD, SEM, cyclic voltammetry and UV-Vis spectroscopy. The electrochromic performance of the WO3 coatings was influenced by calcination temperature, by sol chemistry and by the adsorbed water content. For all sol formulations the coatings calcined at 250 °
C were amorphous and have shown better performance compared to crystalline counterparts calcined at 400 °
C. High calcination temperature also leads to formation of WO3 nanocrystals for APTA and PTA derived coatings, titanium doping retards crystallization. Presence of acetic acid as in APTA sol improved the electrochromic and electrochemical performance. This was related to removal of organics- acetic acid and peroxo ligands- during calcination, which results in an open W-O network providing more ion insertion sites. The water adsorption affected the electrochromic performance in different ways for the coatings calcined at 250 °
C and 400 º
C. The amorphous coatings with limited structural water removal and excessive hydroxyl groups tend to crystallize by condensation of W-OH groups upon storage in open atmosphere, therefore exhibiting degrading electrochromic activity with aging. Conversely, hydroxyl groups enhanced Li+ ion insertion for the stable crystalline coatings calcined at 400 °
C.
Taylor, Douglas John. "Structure and properties of laser-fired, sol-gel derived tungsten oxide films". Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187173.
Texto completo da fonteMoura, Diego Soares de. "Obtenção de filmes de óxido de tungstênio tendo como agente estruturante o surfactante catiônico cloreto de dodeciltrimetilamônio". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/108370.
Texto completo da fonteIn this work tungsten oxide films have been obtained bymodified sol-gel method, with sodium tungstate dehydrate (Na2WO4.2H2O) as the precursor and the cationic surfactant dodecyltrimethylammonium chloride (DTAC) as structuring agent.The behavior in aqueous media of precursor/structuring agent systems was characterized by pH, conductivity and viscosity measurements. Two methods for obtaining tungsten oxide films were evaluated: the first consisted in obtaining sodium tungstate films from the systems containing 10 mmol.L-1 of Na2WO4.2H2O at different DTAC concentrations, by casting, converting the sodium tungstate to tungsten oxide; the second method consisted in the conversion of the aqueous systems containing 20 mmol.L-1 of Na2WO4.2H2O at different DTAC concentrations to tungstic acid, obtaining the films by spin coating and, posteriorly, calcination in the presence of air. The films were obtained on silicon substrate (100) with a 50 nm layer of silicon dioxide and were characterized by X-ray diffraction, Rutherford backscattering spectrometry, Raman spectroscopy, Scanning Electron Microscopy and photocatalytic tests. The precursor concentration and structuring agent do not affect significantly the pH and the viscosity of the precursor systems in aqueous media.The values of critical micelle concentration (CMC) of DTAC, obtained by the conductivity, were of13 mmol.L-1 and 9,88 mmol.L-1, for the systems containing 10 and 20 mmol.L-1 de Na2WO4.2H2O, respectively.In both adopted methods the final product is the tungsten oxide, with nano and micrometric structures in the form of discs and plates. The thickness of the films obtained in the first method varied from 4 to 5 μm and the structures presented an average diameter around 4,37 μm and 114 nm. The thickness of the films obtained with the second methodvariedfrom0,5to 1 μm and the structures presented an average diameter from 95 to103 nm.The obtained tungsten oxide films presented photocatalytic activity, since doubled the reaction rate of methyl orange dye degradation with respect to the system without the film.
Yin, Zhewen. "Non-precious Metal Catalysts for Oxygen Reduction Reaction in Alkaline Solutions". Scholar Commons, 2018. http://scholarcommons.usf.edu/etd/7250.
Texto completo da fonteSidhoum, Charles. "In-situ study of hybrid nanomaterial formation : a multiscale approach combining electron microscopy and spectroscopic techniques". Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAE041.
Texto completo da fonteThis thesis explores the nucleation and growth of two distinct chemical systems using in-situ Transmission Electron Microscopy (TEM) as a main tool. The first system involves hybrid perovskites, synthesized through a precipitation method using two solvents with different polarities. The second system investigates the growth of a more covalent structure, the tungsten oxide gel, using a sol-gel approach. These “Chimie-Douce” approaches often leads to metastable kinetic phases that slowly transition to a more stable thermodynamic phase. The primary goal of this thesis is to leverage in-situ techniques to monitor these processes in real-time, providing insights into the kinetics and chemical transformations.The in-situ TEM data are complemented by other techniques, such as X-ray diffraction, Small Angle X-ray Scattering, Nuclear Magnetic Resonance, and others. This combined approach seeks to fill a gap in the dynamic in-situ studies at the nanometer scale, focusing on correlative studies to obtain a comprehensive view of the formation mechanisms
Michalak, Franck. "Étude d'électrodes composites polymères/oxydes colloidaux : application aux systèmes électrochromes sur supports souples". Grenoble INPG, 1995. http://www.theses.fr/1995INPG0091.
Texto completo da fonteChen, Rei-Lin, e 陳瑞琳. "Preparing Electrochromic material Tungsten Oxide by Sol-Gel method". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/64645832319371835409.
Texto completo da fonte逢甲大學
化學工程學所
92
Electrochromism is currently attracting more attentions from the academia and industries. There are many commercial applications for the electrochromic devices, such as sunroof window in a car, smart windows in order to balance the lighting in a house, antiglare mirror and electrochromic displays. Electrochromic materials include two types that are inorganic and organic ones. Especially for the inorganic type it can tolerate the dramatic environmentally changes, the typical materials are ITO, WO3 and NiOx, etc. The WO3 is the most investigated inorganic material, cause of its high transmittance difference. In this study sol-gel method is main concerned for the preparations of the tungsten oxide. The method has some advantages, which are low cost, easy to scale up to the large surface area and even the different aspect. At first, the solutions of sol-gel were prepared by using different precursor and catalyst (precursor : WOCl4 , WCl6), and spin-coating process used to deposit tungsten oxide film on the ITO glass, then conducted with the IR heat treatment. The deposited films were characterized by X-ray diffraction, scanning electronic microscopy and α-step film thickness. Several tungsten precursors were investigated in this study. The acid and base sol-gel solutions are also tested to observe the coloration of electrochromical films. From the CV/UV-VIS spectra we found that the sol-gal method is promising and WCl6 precursor is the better one.
Li, Ming Cong, e 李明聰. "Synthesis of Mesoporous Tungsten Oxide by Sol-gel Method". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/33204086395658895278.
Texto completo da fonte國立屏東科技大學
機械工程系所
95
Nanomaterials have unique properties in comparison with powder materials. Mesostructured materials with tailored pore structures and high surface areas in order to improve sensitivity have gathered increasing attention in recent years. In this study, mesoporous WO3 was prepared by sol-gel process and the synthesis was accomplished by using block copolymer as the template, and tungsten chloride as the inorganic precursor. We investigated the effects of synthesis variables on the structure of mesoporous WO3, such as the concentration of triblock copolymer, hydrolysis reaction, and the calcination temperatures. Thermo-gravimetric analysis, X-ray diffraction, transmission electron microscopy and N2 adsorption-desorption isotherms were used to characterize the microstructure of the samples. Mesoporous WO3 have been synthesized by using triblock copolymer F108 as a template and monoclinic structure were obtained after calcined at 300~400°C. The mesoporous WO3 is shown to have a high specific surface area of 129.5 m2/g as calcined at 300°C, and mesoporous structure was stable up to 350 °C. The addition of block copolymer can affect the structure of mesoporous. The addition of block copolymer increased from 0.1 to 1.0 g, and the specific surface area increased from 67.5 to 124.7 m2/g after calcined at 300°C. The microstructure of mesoporous WO3 is determined by the calcination temperature. From 300 to 400 ℃, the grain size increased from 6 to 12 nm, it can be seen that by increasing the calcined temperature a larger crystallite size is favored. Additionally, the crystallinity of mesoporous WO3 is controlled by the water content of the reaction system. From XRD results, the mesoporous WO3 with the better crystallinity are obtained with the increasing of the water content. Replaced with water from 0 to 50 %, the BET surface area decreased from 124.7 to 48.12 m2/g, but the average pore size increased from 7.79 to 14.098 nm after calcined at 300 ℃.
Lin, Hung-Bin, e 林弘斌. "Gas Sensing Properties of Tungsten Oxide / Titanium Oxide Films Prepared by Sol-gel Technique". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/96733043277716671619.
Texto completo da fonte逢甲大學
材料科學所
96
Abstract In this study, tungsten oxide/titanium oxide (5, 7.5, 10, 15, and 20%, respectively) composite powders were prepared by sol-gel technique. The as-prepared powders were examined by X-ray diffraction, scanning electron microscope, Fourier-transform infrared spectroscopy, and UV-visible spectroscopy. The composite powders were then deposited onto the alumina substrate and gas sensing properties were investigatd. Experimental results showed that the structure of the tungsten oxide/titanium oxide (10% addition) powders exhibited monoclinic WO3 phase at low temperature and gradually transformed into triclinic WO3 phase after heating at 300 oC. The sensors prepared by tungsten oxide/titanium oxide (10% addition) powders also exhibited the best gas sensing performance. Under an environment of 3 ppm NO2 gas, the sensitivity was 29.9 and 86.1 when tested at 200 and 150 oC, respectively. In addition, the sensitivity was 79.4 (only 8% degradation) after 20 repetitive gas adsorption-and-desorption cycles when tested under 3 ppm NO2 at at 150 oC. Meanwhile, when tested by reductive CO gas, a decrease in resistance can be observed and showed an opposite variation with respect to NO2 gas.
Chao, Ching-Wen, e 趙靜雯. "Preparation of Gasochromism Tungsten Oxide Thin Film by Sol-gel Method". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/37435056437432111691.
Texto completo da fonte逢甲大學
材料與製造工程所
95
Gasochromism, a technology similar to electrochromism, is able to change color without external electric source. The principle is that the gasochromic layer is colored by accepting electrons from hydrogen. Therefore, the gasochromism technology has broad applications such as smart windows as well as hydrogen sensor. In this study, the material of gasochromism was prepared by sol-gel process, which has the advantages of low cost, friendly operation, and easy to scale up to the large surface area. The gasochromic material of WO3 could be created by the steps hereinafter. Firstly, WO3 was prepared by sol-gel process and then deposited on the ITO glass by spin-coating. Secondly, thermal treatment was provided. Finally, catalytic layer was formed by electroless plating process. We used nitric acid as catalyst, hydrogen peroxide as oxidizer, and isopropyl alcohol as solvent to analyze the influence of their concentrations to the ability of color changing and the surface structure of WO3 film to acquire the best process condition. Next, the deposited films were characterized by scanning electronic microscopy (SEM) and SEM / EDS, surface mapping microscope and X-ray diffraction. Further, UV-VIS spectrometer was employed to detect the transmission rate of light for both colored and bleached WO3 films. Finally, FTIR was employed to verify the spectrum of WO3 film. From the experimental results, we concluded that during the preparation of the material of gasochromism by sol-gel process, adding little quality HNO3 and H2O2 aqueous could reduce the time of hydrolysis, accelerate reaction. So we acquire the amorphous structure nano WO3 film with high coloring ability (DT550nm =37.58%), good surface quality (Ra <10nm), and uniform grain size (23~28nm).
Trabalhos de conferências sobre o assunto "Tungsten oxide gel"
Ozkan, Esra, Se-Hee Lee, Ping Liu, C. Ed Tracy, Fatma Z. Tepehan, J. Roland Pitts e Satyen K. Deb. "Optical and electrochromic properties of sol-gel-deposited tungsten oxide films". In International Symposium on Optical Science and Technology, editado por Carl M. Lampert, Claes-Goran Granqvist e Keith L. Lewis. SPIE, 2001. http://dx.doi.org/10.1117/12.448247.
Texto completo da fonteLee, W. J., Y. K. Fang, Daoyang Huang e Fang C. Ho. "Sputter-Deposited Electrochromic Films of Tungsten Oxide: A Study of the Effects of Varying the Target-Substrate Distance". In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.thc.3.
Texto completo da fonteGreen, David C., John M. Bell e Geoffrey B. Smith. "Microstructure and stoichiometry effects in electrochromic sol-gel deposited tungsten oxide films". In Optical Materials Technology for Energy Efficiency and Solar Energy, editado por Anne Hugot-Le Goff, Claes-Goeran Granqvist e Carl M. Lampert. SPIE, 1992. http://dx.doi.org/10.1117/12.130545.
Texto completo da fonteCremonesi, Alessandro, Danilo Bersani, Pier Paolo Lottici, Gianluca Calestani, P. M. Champion e L. D. Ziegler. "Raman And SEM Characterization Of Sol-Gel Derived Nanofibers Of Tungsten Oxide". In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482695.
Texto completo da fonteDjaoued, Yahia, P. V. Ashrit, S. Badilescu e R. Bruning. "Microstructure, optical, and electrochromic properties of sol-gel nanoporous tungsten oxide films". In SPIE Proceedings, editado por Janis Spigulis, Janis Teteris, Maris Ozolinsh e Andrejs Lusis. SPIE, 2003. http://dx.doi.org/10.1117/12.517023.
Texto completo da fonteHou, Changjun, Jiale Dong, Yan Xu, Danqun Huo, Yike Tang e Jun Yang. "Preparation and Characterization of Pt/WO3 Nano-Film and Its Hydrogen-Sensing Properties". In 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70010.
Texto completo da fonteRelatórios de organizações sobre o assunto "Tungsten oxide gel"
Cervantes, O. Synthesis, Consolidation and Characterization of Sol-gel Derived Tantalum-Tungsten Oxide Thermite Composites. Office of Scientific and Technical Information (OSTI), junho de 2010. http://dx.doi.org/10.2172/1129990.
Texto completo da fonte