Bibliografías temáticas / Sol-Gel Dip-Coating

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Literatura académica sobre el tema "Sol-Gel Dip-Coating"

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Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Sol-Gel Dip-Coating"

1

Jeffrey Brinker, C. y Alan J. Hurd. "Fundamentals of sol-gel dip-coating". Journal de Physique III 4, n.º 7 (julio de 1994): 1231–42. http://dx.doi.org/10.1051/jp3:1994198.

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2

Brinker, C. J., G. C. Frye, A. J. Hurd y C. S. Ashley. "Fundamentals of sol-gel dip coating". Thin Solid Films 201, n.º 1 (junio de 1991): 97–108. http://dx.doi.org/10.1016/0040-6090(91)90158-t.

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Liu, Hui Cong, Liqun Zhu y Yan Bin Du. "Modification of Electroless Nickel-Plating Coatings with Sol-Gel Film". Materials Science Forum 475-479 (enero de 2005): 3835–38. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.3835.

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Four Sol-Gel films were developed by dip-coating electroless nickel-plated samples in different Sols, followed by heat treatment. The effects of the coating times and heat treatment temperature on the corrosion, oxidation resistance and wearing quality of the modified coating were examined. Results show that, after six coating, Sol-Gel films obtained can provide good corrosion and oxidation resistance, and their anti-corrosion quality remains high even after being oxidized at 500 °C for 60 hours. Addition of inorganic molybdenum salt or chromate into the Ti Sol also makes the wearing quality of the Sol-Gel film better.
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4

Vishvakarma, Shubham, Rajesh Kannan, Nitesh Vashishtha y Arendra Pal Singh. "Evaluation of hybrid sol-gel alumina coating for electrical resistance applications". Surface Topography: Metrology and Properties 9, n.º 4 (25 de noviembre de 2021): 045030. http://dx.doi.org/10.1088/2051-672x/ac3a9b.

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Abstract In an electric motor, bearing plays a vital role in the performance and reliability which fails frequently due to electrical pitting. To avoid this issue, the bearing can be coated with insulation material. In this present investigation, hybrid sol-gel coating was carried out on bearing steel by dip-coating method. The hybrid sol-gel was prepared using aluminium isopropoxide and calcined alumina powder. The ratio of Sol-Gel to calcined alumina and thickness of the coating was optimized to attain a crack-free surface coating. The crack behaviour was studied. The characterization of Hybrid Sol-Gel was carried out using Fourier-transform infrared spectroscopy and the surface morphology was observed using an optical microscope. The electrical resistance of the coating was measured using an insulation resistance tester. The crack-free surface coating of 40 microns was achieved at a low sol-gel to calcined alumina ratio. The electrical resistance of the coating is found suitable for bearing application. The thermodynamically stable hybrid sol-gel i.e., α alumina -ϒ alumina coating surface is proposed for electrical insulation coating.
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5

Innocenzi, P. C., M. Guglielmi, M. Gobbin y P. Colombo. "Coating of metals by the sol-gel dip-coating method". Journal of the European Ceramic Society 10, n.º 6 (enero de 1992): 431–36. http://dx.doi.org/10.1016/0955-2219(92)90018-9.

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Gu, Peng, Xinghua Zhu y Dingyu Yang. "Structural, optical and photoelectric properties of Mn-doped ZnO films used for ultraviolet detectors". RSC Advances 9, n.º 14 (2019): 8039–47. http://dx.doi.org/10.1039/c9ra01099h.

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Cha, Young Chul, Chul Eui Kim, Seung Hun Lee, Hae Jin Hwang, Ji Woong Moon, In Sub Han y Sang Kuk Woo. "Synthesis of Silica Aerogel Thin Film from Waterglass". Solid State Phenomena 124-126 (junio de 2007): 671–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.671.

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Hydrophobic thin film silica aerogels were synthesized by ambient pressure drying method from silicic acid which was prepared from sodium silicate (water glass) solution. The pH value of the silica precursor sol was adjusted to make a spinable sol, and gel films were coated on a glass substrate by dip coating technique. Aerogel-like thin films with the thickness of about 1 μm could be successfully fabricated by repeating the dip coating process three times.
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8

Caruso, Ricardo, Antonio Di´az-Parralejo, Pedro Miranda y Fernando Guiberteau. "Controlled preparation and characterization of multilayer sol-gel zirconia dip-coatings". Journal of Materials Research 16, n.º 8 (agosto de 2001): 2391–98. http://dx.doi.org/10.1557/jmr.2001.0328.

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We describe a method for controlled preparation of sol-gel ceramic multilayer coatings obtained by dip-coating. The proposed fabrication routine guarantees obtaining crack-free multilayer coatings with control of the thickness and porosity of individual layers. The procedure is applied to obtain a 10-layer ZrO2–3 mol% Y2O3 coating deposited on AISI 310 stainless steel. The microstructure of this coating was investigated by using x-ray powder diffractometry and atomic force microscopy, and special consideration was given to the mechanical characterization of this thin film using ultramicrohardness indentation tests. Our results suggest that these zirconia coatings have good properties for use as protection barriers. Implications concerning general tailoring design of sol-gel dip-coatings are also considered.
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9

Jamarun, Novesar, Lia Anggresani y Syukri Arief. "DIP-COATING SENYAWA KALSIUM FOSFAT DARI BATU KAPUR BUKIT TUI MELALUI METODE SOL-GEL". Jurnal Riset Kimia 5, n.º 1 (12 de febrero de 2015): 46. http://dx.doi.org/10.25077/jrk.v5i1.179.

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ABSTRACT Preparation of Dip-Coating Calcium Phosphate via sol-gel method using natural limestone Bukit Tui as calcium precursors and diammonium hydrogen phosphate as phosphorus precursors with sol-gel process has been investigated. Ethanol was used as solvent and DEA (diethanolamine) was used stabilizing agent. The powder were prepared by calcinated the sol at 950 oC. The products were characterized by Fourier Transform Infra Red, X-Ray Diffraction and Scanning Electron Microscopy. FTIR results showed that the vibration form was PO43-, P2O74-, O-H and CO2. XRD patterns of powder with various Ca/P mol ratio showed that the product of calcium phosphate was Ca2P2O7 and also found the hydroxyapatite Ca10(PO4)6(OH)2 in Ca/P mol ratio 1,7. SEM images of powder calcium phosphate revealed that their morphology were spheric and homogen. The coating process was done at glass substrate with coating speed 20 cm/min by calcinations at 400 oC. XRD patterns of thin layer showed that the product was Ca2P2O7 and SEM images of thin layer revealed that their morphology were bulk. Keywords: Natural limestone, calcium phosphate, hydroxyapatite, sol-gel, dip-coating
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10

Yu, Xin Gang, Yanbin Zuo, Hong Wen Ma, Hui Feng Zhao, Wu Wen Luo, Wenrue Bi y Wang Li. "Study on the Macro-Residual Stress of 304 Stainless Steel Coated with TiO2-SiO2 Thin Films by Sol-Gel Process". Key Engineering Materials 280-283 (febrero de 2007): 815–18. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.815.

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X-ray diffraction (XRD) method to measure the residual stress in the metal substrate surface layer and the medial oxide layer between thin film and metal substrate was introduced and the sol-gel TiO2-SiO2 thin film was successfully prepared on SUS304 stainless steel substrate by dip-coating process. The macro residual stress existing in metal substrate was analyzed by XRD. It turns out that the compressive stress existing in the metal substrate surface layer decreases with the raising of heat-treated temperature and that the compressive stress of metal substrate surface layer and the tensile stress of the medial oxide layer increase with the increase of the withdrawal speeds of the sol-gel dip-coating. Based on the above study, colored stainless steels of high quality were prepared by sol-gel process for the first time.
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Tesis sobre el tema "Sol-Gel Dip-Coating"

1

Weng, Luqian. "Sol-gel processing of tellurite thin films". Thesis, University of Lincoln, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312891.

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2

Sentanin, Franciani Cassia. "Preparação e caracterização de filmes finos de SnO2:Sb pelo processo de sol-gel". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-17112008-105835/.

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No presente trabalho foram obtidos e caracterizados filmes finos de SnO2 e SnO2:Sb preparados pelo processo sol-gel. Estes filmes foram estudados através da influência do número de camadas nas suas propriedades ótico-eletroquímicas. Foi observado que a densidade de carga para um filme de SnO2:Sb de 5 camadas foi de 40 mC/cm2, tornando-se um excelente candidato como contra-eletrodo para aplicação em janelas eletrocrômicas. Os filmes de SnO2 e SnO2:Sb também foram estudados utilizando técnicas eletroquímicas: cronoamperometria e voltametria cíclica cujo o enfoque na análise foi o de intercalação de lítio em função da carga inserida. As medidas de transmissão ótica na região de ultravioletainfravermelho próximo revelaram que estes filmes possuem leve coloração azul, evidenciadas pela mudança do espectro UV-Vis em 8% entre estado colorido e descolorido; Por espectroscopia no infravermelho dos sóis, foi possível observar bandas características dos grupos de moléculas presentes em alcóxido, confirmando a formação do alcóxido de estanho enquanto dos precipitados apenas evidências da formação do óxido de estanho. As morfologias dos filmes estudadas por Microscopia Eletrônica de Varredura (MEV) e Microscopia de Força Atômica (AFM) demonstraram que o filme apresenta pequenos riscos, provavelmente devido a presença de Sb, e por AFM obtidas informações da rugosidade e do tamanho de grão, sendo estes valores de 100 nm e 104 nm respectivamente. A partir do espectro do filme por EDX foi possível confirmar a presença de estanho e antimônio nos filmes. A estrutura dos xerogéis e dos sóis para deposição dos filmes estudada por difração de raios-X é a casseterite. Por fim Análises Térmicas (DSC/TGA) demonstram que à 60oC um pico endotérmico correspondendo à liberação de água e uma perda da massa de 6,3 %, e na faixa de 450C um pequeno aumento da linha de base no sentido exotérmico atribuído a cristalização do SnO2:Sb na fase casseterite, com perda de massa de 33%.
In this study were obtained and characterized thin films of SnO2 and SnO2: Sb prepared by the sol-gel process. These films were studied through the influence of the number of layers in its optical-electrochemical properties. It was observed that the density of charge for a film of SnO2: Sb, 5 layers was 40 mC/cm2, making it an excellent candidate as counter-electrode for use in electrochromic windows. The films of SnO2 and SnO2: Sb also were studied using electrochemical techniques: chronoamperometry and cyclic voltammetry with a focus on analysis of intercalation of lithium according to load inserted. Measures of optical transmission in the ultraviolet region of near-infrared revealed that these films have light blue colour, highlighted by the changing spectrum of UV-Vis by 8% between state and colorful discolour; In the infrared spectroscopy, in solution has been possible to see bands characteristics groups of molecules present in alkoxide, confirming the formation of alkoxide of tin while the precipitated only evidence of the formation formation of tin oxide. The morphologies of the films studied by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) showed that the film presents little risk, probably because the presence of Sb, and the information obtained by the AFM roughness and the size of grain, and these values of 100 nm and 104 nm respectively. From the spectrum of the film by EDX were unable to confirm the presence of tin and antimony in the films. The structure of xerogel and solution for deposition of films studied by X-rays diffraction is the cassiterite. Finally Thermal Analysis (DSC / TGA) show that the 60oC a peak endothermical corresponding to the release of water and a loss of the mass of 6.3%, and in the 450ºC a small increase from baseline in the sense attributed range of exothermically the crystallization of SnO2:Sb during casseterite, with mass loss of 33%.
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3

Bezzi, Federica <1978&gt. "Studio di rivestimenti antiriflesso da sol-gel dip-coating per impianti solari termodinamici". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/298/1/Bezzi_Federica__XIX_Ciclo__2007.pdf.

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Negli impianti utilizzati per la produzione di energia elettrica che sfruttano l'energia solare, quali la tecnologia solare a concentrazione (Solare Termodinamico) sviluppata da ENEA, per minimizzare le dispersioni di calore è necessaria una elevata selettività spettrale. Per ottimizzare l'efficienza dell'impianto è quindi necessario lo sviluppo di materiali innovativi, in grado di minimizzare la quantità di energia dispersa per riflessione. In questo studio, per incrementare la trasmittanza solare dei componenti in vetro presenti nei tubi ricevitori dell'impianto, sono state utilizzate tipologie diverse di rivestimenti antiriflesso (multistrato e a singolo strato poroso). I rivestimenti sono stati ottenuti mediante via umida, con tecnica di sol-gel dip-coating. I sol coprenti sono stati preparati da alcossidi o sali metallici precursori degli ossidi che costituiscono il rivestimento. Sono state approfondite sia la fase di sintesi dei sol coprenti, sia la fase di deposizione sul substrato, che ha richiesto la progettazione e realizzazione di una apparecchiatura prototipale, ossia di un dip-coater in grado di garantire un accurato controllo della velocità di emersione e dell'ambiente di deposizione (temperatura e umidità). Il materiale multistrato applicato su vetro non ha migliorato la trasmittanza del substrato nell'intervallo di lunghezze d'onda dello spettro solare, pur presentando buone caratteristiche antiriflesso nell'intervallo dell'UV-Vis. Al contrario, l'ottimizzazione del rivestimento a base di silice porosa, ha portato all'ottenimento di indici di rifrazione molto bassi (1.15 to 1.18) e ad un incremento della trasmittanza solare dal 91.5% al 96.8%, efficienza superiore agli attuali rivestimenti disponibili in commercio.
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4

Bezzi, Federica <1978&gt. "Studio di rivestimenti antiriflesso da sol-gel dip-coating per impianti solari termodinamici". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2007. http://amsdottorato.unibo.it/298/.

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Negli impianti utilizzati per la produzione di energia elettrica che sfruttano l'energia solare, quali la tecnologia solare a concentrazione (Solare Termodinamico) sviluppata da ENEA, per minimizzare le dispersioni di calore è necessaria una elevata selettività spettrale. Per ottimizzare l'efficienza dell'impianto è quindi necessario lo sviluppo di materiali innovativi, in grado di minimizzare la quantità di energia dispersa per riflessione. In questo studio, per incrementare la trasmittanza solare dei componenti in vetro presenti nei tubi ricevitori dell'impianto, sono state utilizzate tipologie diverse di rivestimenti antiriflesso (multistrato e a singolo strato poroso). I rivestimenti sono stati ottenuti mediante via umida, con tecnica di sol-gel dip-coating. I sol coprenti sono stati preparati da alcossidi o sali metallici precursori degli ossidi che costituiscono il rivestimento. Sono state approfondite sia la fase di sintesi dei sol coprenti, sia la fase di deposizione sul substrato, che ha richiesto la progettazione e realizzazione di una apparecchiatura prototipale, ossia di un dip-coater in grado di garantire un accurato controllo della velocità di emersione e dell'ambiente di deposizione (temperatura e umidità). Il materiale multistrato applicato su vetro non ha migliorato la trasmittanza del substrato nell'intervallo di lunghezze d'onda dello spettro solare, pur presentando buone caratteristiche antiriflesso nell'intervallo dell'UV-Vis. Al contrario, l'ottimizzazione del rivestimento a base di silice porosa, ha portato all'ottenimento di indici di rifrazione molto bassi (1.15 to 1.18) e ad un incremento della trasmittanza solare dal 91.5% al 96.8%, efficienza superiore agli attuali rivestimenti disponibili in commercio.
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5

Lionti, Krystelle. "Élaboration d’un revêtement dense et protecteur sur polycarbonate". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10225/document.

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Ce travail s’intéresse a la synthèse et à la caractérisation de revêtements hybrides O/I à base de silice, préparés par voie sol-gel et déposés sur polycarbonate (PC), pour des applications en milieu chaud et humide dans le domaine culinaire. Le PC étant connu pour sa sensibilité à l’hydrolyse dans ce type de milieux (provoquant sa dépolymérisation progressive et ainsi la libération de bisphénol A, molécule suspectée comme étant toxique), le rôle du revêtement est donc de protéger le PC et d’éviter son vieillissement prématuré, tout en améliorant ses propriétés mécaniques. Dans un premier temps, de nombreux sols ont été synthétisés et optimisés, principalement en termes de nature et quantités de précurseurs, et de pH, dans le but d’obtenir des revêtements homogènes et transparents. Un suivi des réactions d’hydrolyse et de condensation des sols a également été réalisé afin de déterminer le temps minimal de maturation de ces derniers. Apres dépôt des revêtements par dip-coating, les propriétés mécaniques des films ont été étudiées par de nombreuses techniques. D’un point de vue général, les propriétés des échantillons revêtus ont été trouvées supérieures à celles du PC nu. L’influence de nombreux paramètres de synthèse comme le ratio organoalcoxysilane(s)/silice colloïdale, l’ajout d’additifs, le type de traitement de surface du PC pré-dépôt ou encore les conditions de recuit, a également été étudiée. L’ensemble de ce travail a permis d’obtenir, à partir de deux systèmes sol-gel différents, des revêtements performants en termes de transparence, d’adhésion au substrat, de non-toxicité, couplés à des valeurs élevées de dureté, de densité et de module de Young
This work deals with the synthesis and the characterization of hybrid O/I silica coatings prepared by the sol-gel route and deposited on polycarbonate (PC), for applications in hot and humid environment in the alimentary field. PC is well-known for undergoing hydrolysis in such conditions (causing its progressive depolymerization and thus leading to the release of bisphenol A, a molecule suspected to be toxic): the function of the coating would thus consist in preventing PC from this kind of premature ageing, along with the enhancement of its mechanical properties. As a first step, a lot of different sols were synthesized and optimized, mainly in terms of type and quantity of precursors, along with the pH, in order to obtain transparent and homogeneous coatings. The hydrolysis and condensation reactions were monitored in order to determine the minimum ageing time to be waited before any film deposition. After deposition by dip-coating, the mechanical properties of the films were assessed by using many different techniques. Basically, the coated-PC samples display higher properties than the uncoated one. The influence of numerous synthesis parameters such as the organoalkoxysilanes/colloidal silica ratio, the presence of additives, the kind of surface treatment of PC before film deposition, or the annealing conditions was also studied. This whole work led to the synthesis, from two different sol-gel systems, of superior quality coatings in terms of transparency, adherence to the substrate, non-toxicity, along with elevated hardness, density and Young’s modulus values
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6

Sano, Dayene Miralha de Carvalho [UNESP]. "Simulação numérica da fase líquida na deposição de filmes finos via sol-gel: aplicações para dióxido de estanho". Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/100923.

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Made available in DSpace on 2014-06-11T19:31:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-03-18Bitstream added on 2014-06-13T21:02:05Z : No. of bitstreams: 1 sano_dmc_dr_bauru.pdf: 2390435 bytes, checksum: c70bb14dca9d8503f9a9ce373ebe90a2 (MD5)
Neste trabalho foi realizada a simulação numérica da fase líquida no processo de deposição de filmes finos pela técnica de molhamento (dip-coating), via sol-gel, utilizando como aplicação soluções precursoras de dióxido de estanho (Sn'IND. 2'). Dióxido de estanho é um semicondutor transparente de gap largo, amplamente utilizado em muitos tipos de dispositivos. Além da técnica convencional, o trabalho analisa uma nova proposta da técnica de deposição dip-coating onde a solução se encontra em uma temperatura diferente da ambiente. Para ambas as técnicas foram realizadas a modelagem matemática dos problemas e desenvolveu-se um método numérico apropriado baseado no método MAC (Marker and Cell). O problema foi resolvido em coordenadas cartesianas bidimensionais e as equações foram discretizadas pela técnica de diferenças finitas. Os resultados numéricos são visualizados por meio da distribuição de temperatura e vetores velocidade da solução precursora, que fornecem subsídios para investigação da influência dos vetores velocidade na obtenção de filmes com boas propriedades, em relação à uniformidade e homogeneidade. Verifica-se que estas características refletem diretamente na qualidade óptica dos filmes investigados, tornando-se parâmetros importantes para aplicações em dispositivos opto-eletrônicos. Através dos resultados numéricos verificou-se que nas regiões do fluido próximas ao substrato, os módulos dos vetores velocidade são maiores, há uma maior quantidade de material sendo depositado. Notou-se também, através da distribuição de velocidades em direção ao substrato que o filme tem uma melhor uniformidade na sua espessura quando os vetores velocidade possuem os valores de seus módulos mais próximos uns dos outros. Portanto, mudando os parâmetros iniciais de viscosidade, densidade, velocidade de imersão/emersão do substrato ou temperatura no fluido pode-se estudar o comportamento.
In this work, the numerical simulation of liquid phase in the thin film deposition, by the sol-gel-dip-coating technique, was carried out. The method was applied to tin dioxide (Sn'IND. 2') solutions. Tin dioxide is a transparent semiconductor of wide bandgap, extensively used in many types of devices. Besides the conventional procedure, this work analyses a new proposal for the deposition technique, where the solution is heated above room temperature. In both cases, the mathematical modeling was done and the appropriated numerical method was developed, based on MAC (Marker and Cell) approach. The problem was solved in two-dimensional Cartesian coordinates and the equations were discretized by the finite difference technique. The numerical results are visualized through temperature and vector velocity distributions in the precursos solution, yielding subsides to the investigation of the influence of vectors velocity in the deposition of good property films, concerning uniformity and homogeneity. It was verified that these characteristics point directly toward the optical quality of investigated films, becoming important parameters for application in optoelectronic devices. The numerical results allow verifying that in the fluid regions close to the substrate, where the velocity modulus is highter, there is a larger amount of material being deposited. It was also noticed, through the velocity distribution towards the substrate, that the film has a better thickness uniformity when the vectors velocity have modulus values closer to each other. Therefore, changing initial parameters such as viscosity, density, substrate dipping rate or fluid temperature, it is possible to evaluate the fluid behavior during the thin film deposition.
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7

Sacilotto, Daiana Guerra. "Obtenção e caracterização de revestimento hidrofóbico utilizando viniltrietoxisilano (VTES) como precursor em solução sol-gel sobre aço inoxidável AISI 204 por dip-coating". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/134902.

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Filmes hidrofóbicos são caracterizados por repelir soluções aquosas quando em contato com superfícies revestidas ou com algum material que possua propriedades hidrofóbicas. Estes materiais têm despertado a atenção tecnológica devido às propriedades de: auto-limpeza, anti-gelo, anti-aderente e anti-corrosão. Este trabalho teve como objetivo a obtenção do filme hidrofóbico, em temperatura ambiente, utilizando o silano viniltrietoxisilano (VTES) sobre chapas de aço inoxidável AISI 204 em solução sol-gel pelo processo de dip-coating, tendo como finalidade o aumento da resistência à corrosão do substrato metálico. Para a reação de hidrólise foi preparada uma solução com relação percentual de silano/etanol/água de 4/48/48% em volume. Alguns parâmetros da solução e da superfície do substrato foram variados, tais como o tempo de hidrólise do silano na solução sol, em 2 e 24 horas, e a rugosidade do substrato pelo processo de jateamento com micropartículas de óxido de alumina comparando-o com o substrato liso (sem modificações). O filme foi caracterizado por microscopia eletrônica de varredura (MEV), ângulo de contato (CA), espectroscopia no infravermelho por transformada de Fourier (FTIR), espectroscopia de impedância eletroquímica (EIE), polarização potenciodinâmica, espectroscopia de energia dispersiva de raios-x (EDS), névoa salina e câmara úmida. Através destas técnicas de caracterização, pode-se avaliar a resistência à corrosão, a homogeneidade e a hidrofobicidade do filme obtido. Os resultados da influência do tempo de hidrólise demonstram que a solução de 24 horas proporciona um aumento na hidrofobicidade do filme de 12° em relação à solução de 2 horas de hidrólise. Enquanto que, a modificação da superfície com o jateamento favorece um aumento de 36° no ângulo de contato em relação à superfície lisa. Os ensaios eletroquímicos mostram que o substrato que possui maior ângulo de contato, 130°, apresenta maior resistência a corrosão comparando-o com as outras amostras, as quais apresentam ângulos de contato menores. Porém, os resultados de névoa salina comprovam que as amostras com a superfície lisa, ângulo de contato de 90°, possuem maior durabilidade do que as amostras jateadas quando expostas a ambientes salinos. Conclui-se que a metodologia utilizada é eficaz para a obtenção de revestimentos hidrofóbicos e para a proteção do metal base contra à corrosão.
Hydrophobic films are characterized to repel water or aqueous solutions when in interaction with coated surfaces or any materials with hydrophobic properties. These materials have attracted attention due the technological properties, like: self-cleaning, anti-icing, anti-adherent and anti-corrosion. This study aimed to obtain the hydrophobic film at room temperature using the vinyltriethoxysilane (VTES) on stainless steel AISI 204 in sol-gel solution by dip-coating process, with the purpose to increase the corrosion resistance of metal substrate. The hydrolysis reaction was prepared a solution with a percentage ratio of silane/ethanol/water 4/48/48% in volume. Some parameters of the solution and the substrate surface were varied, such as silane hydrolysis time in the sol solution at 2 and 24 hours, and the roughness of the substrate by blasting process with microparticles of aluminum oxide and it was compared with the smooth substrate (unchanged). The film was characterized by scanning electron microscopy (SEM), contact angle (CA), infrared spectroscopy by Fourier Transform (FTIR), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, energy dispersive spectroscopy (EDS), salt spray and humid room tests. Through these characterization was possible to evaluate the corrosion resistance, uniformity and hydrophobicity of the film developed. The influence of hydrolysis time showed an increase in contact angle of 12° when used the 24 hours of hydrolysis solution in relation to 2 hours of hydrolysis. While the surface modification using the blasting tecnique favors an increase of 36° in contact angle in comparison to the smooth surface. Between the samples evaluated by electrochemical spectroscopy, proves the higher contact angle, 130°, has best performance in corrosion resistance compared with another samples studied which have lower contact angles. However, the smooth substrate, contact angle 90°, showed the best performance in salt spray test compared to rough surfaces samples. The methodology developed was effective to obtain hydrophobic coatings and protection the metal substrate against the corrosion.
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Zrikem, Khawla. "Influence du traitement UV et du dopage au lithium sur les propriétés électrochromes de couches minces d'oxyde de nickel préparées par sol-gel". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0072.

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L'oxyde de nickel est l'un des matériaux électrochromes les plus utilisés dans le domainedes fenêtres intelligentes qui contrôlent la lumière et la chaleur provenant de l'extérieur versl'intérieur des bâtiments. Il est important de mentionner que l’oxyde de nickelstoechiométrique est un isolant à température ambiante. Les propriétés microstructurales,chimiques, optiques et électrochromes des couches minces dépendent fortement du procédéde préparation et traitement final. En outre, l’un des principaux défis consiste à fabriquer lescouches minces sur des substrats souples afin de fabriquer des fenêtres électrochromes degrande taille ce qui demande un traitement à T ambiante. A cet égard peu d’étudesbibliographiques ont évalué l’effet du traitement par les rayonnements UV sur les propriétésdes couches électrochromes. Dans ce travail, des couches minces d'oxyde de nickel (NiO) ontété préparées par la méthode Sol-Gel associée aux techniques de dépôts par centrifugation(spin-coating) et par trempage-retrait (dip-coating). L’ajustement des paramètresexpérimentaux relatifs à ce procédé (la concentration du précurseur, la nature du solvant et dustabilisant, le nombre de couches déposées et le type des traitement final (calcinationà 300 °C ou traitements UV) a permis d’optimiser les conditions de préparation des couchesminces et par la suite de contrôler les caractéristiques chimiques, microstructurales et optiquesdes couches développées. Cette étude a montré qu'une concentration de 0,3 M d'acétate denickel, le méthanol comme solvant et le triton X-100 en tant que stabilisant conduisent à unecouche mince NiO avec les meilleures performances optiques. Les caractérisations par lestechniques (DRX, ATG, FT-IR, XPS et GDOES) ont particulièrement mis en évidence le rôledes conditions de traitement final sur la composition et la morphologie des couches d’oxydede nickel élaborées. La DRX a montré qu’elles sont faiblement cristallisées et que la structuredevient plus amorphe avec le traitement UV. La spectrométrie UV-visible et les CV ont révéléque les couches traitées par UV en utilisant une lampe de 30 W pendant 5 h (UV-30W-5h)possèdent le contraste optique le plus élevé et la meilleure stabilité électrochimique. L'analysemorphologique a montré que les couches minces déposées par la technique de spin coatingsouffrent de la formation de fissures et d’une hétérogénéisation de la surface. Pour résoudre ceproblème, le procédé de spin-coating a été remplacé par la technique dip-coating tout enconservant les paramètres optimisés précédemment. Cette technique a permis de produire descouches minces plus homogènes et moins fissurées. D'autre part, pour continuer à améliorerles propriétés électrochromes, ces couches ont été dopées par le lithium. Les résultats obtenusont montré l’importance de l’addition de Li sur l’amélioration des propriétés électrochromesde Li : NiO cyclé dans KOH comme électrolyte. En effet, une variation de la transmittanceΔT de 70% (à 450 nm) a été obtenue dans les couches minces 8 % Li: NiO. Le résultat quiressort des caractérisations FT-IR et ATG, porte sur le fait que les couches calcinéescontiennent moins de composés organiques, à l’inverse de celles traitées par UV riches enmatière organique. L'analyse XPS a montré que la teneur en Ni2+ est plus élevée dans lescouches dopées. L’analyse GDOES a montré une distribution homogène de Li dans toutel’épaisseur de la couche. Toutefois, les couches minces de 8% de Li: NiO traitées par UV-30W-5h souffrent d’une dégradation de leurs performances électrochromes dans le KOHaprès quelques cycles, pour cette raison, elles ont été cyclées dans d’autres électrolytesliquides ioniques, tels que le LiTFSI-EMITFSI, le NaTFSI-EMITFSI et le KTFSI-EMITFSI.Les meilleures propriétés électrochromiques ont été obtenues avec l'électrolyte KTFSIEMITFSI.Ce résultat important représente une bonne perspective pour l'avenir
Nickel oxide is one of the most widely used electrochromic materials in the field of smartwindows that control light and heat from the outside to the inside of buildings. It is importantto mention that stoichiometric nickel oxide is an insulator at room temperature. Themicrostructural, chemical, optical and electrochromic properties of the films are highlydependent on the process of preparation and final treatment. In addition, one of the mainchallenges is the elaboration of thin films on flexible substrates suitable for electrochromicapplications which requires treatment at ambient T. In this respect, in literature, few studieshave reported the effect of UV treatment on the properties of electrochromic layers. In thiswork, thin films of nickel oxide (NiO) were prepared by the Sol-Gel method associated withspin-coating and dip-coating techniques. The adjustment of the experimental parametersrelating to this process (the concentration of the precursor, the nature of the solvent and thestabilizer, the number of deposited layers and the type of final treatment (calcination at300 °C or UV treatments) made it possible to optimize conditions for the preparation of thinlayers and subsequently to control their chemical, microstructural and optical characteristics.This study showed that a concentration of 0.3 M nickel acetate, methanol as solvent and triton100-X as a stabilizer lead to NiO thin film with the highest optical properties. The techniquesof characterizations (DRX, ATG, FT-IR, XPS and GDEOS) have particularly highlighted therole of the final treatment conditions on the composition and the morphology of the preparednickel oxide thin films. The XRD results showed that they are weakly crystallized and thestructure becomes even more amorphous for UV treated samples. UV-visible spectrometryand cyclic voltammetry revealed that UV-treated thin films using a lamp of 30 W for 5 h(UV-30W-5h) have the highest optical contrast and the highest electrochemical stability.Morphological analysis (SEM) indicated that the thin films deposited by the spin-coatingtechnique suffer from crack formation and surface heterogenization. To solve this issue, thespin-coating process has been replaced by the dip-coating technique while retaining thepreviously optimized parameters. This technique has made it possible to produce thin filmsthat are more homogeneous and less cracked. On the other hand, to continue to improve theelectrochromic properties, these thin films were doped with lithium. The results showed theimportance of the addition of Li on the improvement of the electrochromic properties ofLi : NiO cycled in KOH as electrolyte. Indeed, a variation of the ΔT transmittance of 70 %was reached for the thin films 8 % Li : NiO. The result of the FT-IR and ATGcharacterizations showed that the calcined thin films contain lesser amount of organiccompounds compared to those treated by UV which still contains large amount of organicmatter. XPS analysis has shown that the Ni2+ content is higher in the doped layers. GDOESanalysis showed a homogeneous distribution of Li along the thickness of the thin film.However, 8% Li: NiO thin films treated with UV-30W-5h suffer from a degradation of theirelectrochromic performances in KOH after a few cycles. For this reason, their cyclingproperties have been investigated in a large range of electrolytes, based on ionic liquidincluding LiTFSI-EMITFSI, NaTFSI-EMITFSI and KTFSI-EMITFSI. The highestelectrochromic properties were obtained with KTFSI-EMITFSI as an electrolyte. Thisimportant result presents a good prospect for the future
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Parakala, Padmaja. "Synthesis and characterisation of bulk and thin films of hydroxyapatite". Thesis, Queensland University of Technology, 2002.

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Daher, Elias. "Conception de nouvelles nanostructures de ZnO pour une dégradation photocatalytique améliorée des polluants organiques". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS320.

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Avec une industrialisation mondiale en croissance continue atteignant 6,1% en 2021 et un fardeau démographique de 8 milliards de personnes, le monde d'aujourd'hui est confronté aux pénuries d'énergie les plus importantes et à la pollution environnementale la plus étendue de son histoire. Particulièrement, les effluents chargés de molécules toxiques organiques récalcitrantes provenant des raffineries, de l'industrie pétrochimique, pharmaceutique, des plastifiants et de nombreuses autres industries mettent en danger la durabilité des eaux de surface et des eaux souterraines. Avec l'inefficacité des techniques de traitement conventionnelles pour résoudre ce problème, les processus d'oxydation avancée (AOP) sont apparus comme une technologie efficace, prometteuse et peu coûteuse, capable de s'attaquer à différents types de molécules organiques dans les milieux aquatiques. Parmi ces techniques, la photocatalyse hétérogène est apparue comme l'une des méthodes les plus efficaces et économiques en raison de la réutilisabilité du photocatalyseur et de l'absence de besoins en matière d'élimination secondaire. La technique est basée sur la génération d'espèces d'oxygène hautement réactives (ROS) lors de l'exposition d'un matériau photocatalytique à la lumière, conduisant à une technologie verte et durable. Ces ROS sont bien connus pour leur forte capacité d'oxydation de la matière organique, conduisant à leur minéralisation en molécules d’eau et dioxyde de carbone. Pour cette raison, le développement d'un photocatalyseur efficace et respectueux de l'environnement est important. Dans ce contexte, l'oxyde de zinc (ZnO) a attiré une grande attention à cause son efficacité élevée de conversion de l'énergie photonique, de son faible coût de production, de son faible degré de toxicité pour la vie marine/humaine et de sa longue durée de vie. Cependant, l'un des principaux défis auxquels ce matériau est confronté est l'efficacité photocatalytique limitée en raison de la recombinaison des paires électron-trou. Par conséquent, de nouvelles stratégies ont été développées pour améliorer son activité photocatalytique, telles que la conception de nouvelles micro/nanostructures de ZnO ou le couplage des photocatalyseurs avec d'autres techniques de traitement pour produire des effets synergiques. L'objectif de cette thèse est de concevoir de nouveaux types de nanostructures de ZnO pour dégrader efficacement les contaminants toxiques en phase liquide ou gazeuse. Pour cette raison, l'impact de la structure chimique des polluants sur la cinétique de dégradation a d'abord été étudié sur diverses molécules organiques toxiques. Ensuite, le système photocatalytique a été adapté pour la photodégradation de particules de microplastiques d'une taille de 300 μm. Les effets de la morphologie et de la microstructure sur l'activité photocatalytique du ZnO ont été étudiés afin d'améliorer l'efficacité du système photocatalytique. Pour y parvenir, des nanobâtonnets, des couches minces poreuses et plissées ont été synthétisés en optimisant les techniques de sol-gel et de croissance hydrothermale en milieu liquide. Bien que les nouveaux matériaux aient montré une cinétique de dégradation améliorée, le taux de recombinaison rapide des paires electron-trou continuait néanmoins de freiner son activité photocatalytique. Pour surmonter cette limitation, une oxydation photo-Fenton-like a été couplée au photocatalyseur ZnO. Quand les deux processus fonctionnant simultanément, un effet synergique a été obtenu grâce à la diminution de la recombinaison électron-trou d'un côté, et la régénération du réactif Fenton de l'autre côté. De plus, une nouvelle matrice de ZnO macroporeuses a été conçue en couplant la chimie sol-gel avec l'auto-assemblage de copolymères en bloc. Le nouveau matériau a présenté des propriétés d'auto-nettoyage remarquables lorsqu'il a été appliqué sur des surfaces revêtues
With a continuously growing global industrialization reaching 6.1% in 2021 and a demographic burden of 8 billion people, today’s world is facing the most extensive energy shortages and environmental pollution in its history. Particularly, loaded effluents with recalcitrant organic toxic molecules from refineries, petrochemicals, pharmaceuticals, plasticizers, and many other industries, are continuously endangering surface and groundwater water sustainability. With the low efficiency of conventional treatment techniques in addressing this issue, advanced oxidation processes have emerged as an efficient, promising, and inexpensive technology, capable of tackling different types of organic molecules in aquatic mediums. Amongst these techniques, heterogeneous photocatalysis has emerged as one of the most efficient and economical methods due to the photocatalyst reusability and lack of secondary disposal requirements. The technique is based on the generating of highly reactive oxygen species (ROS) such as hydroxyl radical and superoxide radical upon the exposure of a photocatalyst material to light, making it a green and sustainable technology. These ROS are well-known for their strong oxidation capacity toward organic matter, leading to their mineralization into harmless molecules such as water and carbon dioxide. For that reason, developing an efficient and eco-friendly photocatalyst is of great importance. In this scope, Zinc oxide (ZnO) has been attracting high attention due to its high conversion efficiency of photonic energy, low production price, low degree of toxicity to marine/human life, and long life span. Nonetheless, one of the main challenges facing this material is the limited photocatalytic efficiency due to the recombination of electron-hole pairs. Therefore, new strategies have been developed to enhance its photocatalytic activity such as designing new micro/nanostructures of ZnO or coupling the photocatalysts with other treatment techniques to produce synergic effects
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Capítulos de libros sobre el tema "Sol-Gel Dip-Coating"

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Puetz, J. y M. A. Aegerter. "Dip Coating Technique". En Sol-Gel Technologies for Glass Producers and Users, 37–48. Boston, MA: Springer US, 2004. http://dx.doi.org/10.1007/978-0-387-88953-5_3.

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Orel, Z. Crnjak, I. Muševič y B. Orel. "Structural Characterization of Sol-Gel Dip-Coating CeO2 and CeO2/SnO2 Films". En Nanoparticles in Solids and Solutions, 519–28. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8771-6_27.

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Zhang, Dao Li, Zhi Bing Deng, Liang Yan Chen y Jian Bing Zhang. "Morphologies and Microstructures of Antimony-Doped Tin Oxide Films Derived by Sol-Gel Dip-Coating Processing". En Key Engineering Materials, 750–53. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.750.

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Pilor, Modou, Bouchaib Hartiti, Allé Dioum, Hicham Labrim, Youssef Arba, Amine Belafhaili, Mounia Tahri, Salah Fadili, Bassirou Ba y Philippe Thevenin. "Study and Characterization of ZnO Thin Films Deposited by Sol–Gel Method Associated With Dip Coating". En Sustainable Energy-Water-Environment Nexus in Deserts, 439–45. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76081-6_54.

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Pilor, Modou, Bouchaib Hartiti, Allé Dioum, Hicham Labrim, Youssef Arba, Amine Belafhaili, Mounia Tahri, Salah Fadili, Bassirou Ba y Philippe Thevenin. "Study and Characterization of ZnO Thin Films Deposited by Sol–Gel Method Associated With Dip Coating". En Sustainable Energy-Water-Environment Nexus in Deserts, 439–45. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76081-6_54.

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Selma, Kaour y Rechem Djamil. "Effect of Dopant Material on the Performance UV Photodetector Based SnO2 Thin Films Deposited by Sol-Gel Dip-Coating Method". En Proceedings of the Third International Symposium on Materials and Sustainable Development, 197–205. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89707-3_24.

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Zhang, Dao Li, Zhi Bing Deng, Jian Bing Zhang y Liang Yan Chen. "The Optical and Electrical Properties of Antimony-Doped Tin Oxide Transparent Conducting Thin Films Prepared by Sol-Gel Dip-Coating Technique". En Key Engineering Materials, 754–57. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.754.

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Chandru, K. y R. Elansezhian. "A Study on Impact of Hydrophobic Effect on Al2O3 Coated Glass by Sol–Gel Dip Coating Method for Automobile Windshield Application". En Springer Proceedings in Materials, 77–85. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1616-0_8.

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Rahmani, Ehsan. "Preparation and Characterization of Thin Films by Sol-Gel Method". En Thin Films - Growth, Characterization and Electrochemical Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.113722.

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The sol-gel method has been widely used to prepare several materials, such as glass fibers, catalysts, electrochemical devices, or thin films. Sol-gel is considered an economical and straightforward method compared to physical vapor deposition (PVD) or chemical vapor deposition (CVD), which are more complex and need more facilities. At the same time, almost the same quality has been evaluated for sol-gel thin films. Furthermore, chemical tailoring of raw materials to produce new functional compositions is more feasible than conventional methods such as PVD. Thin films utilizing sol-gel were prepared by dip coating, spin coating, electrochemical coating, and spray coating methods, where these methods can be used for various substrate types. Prepared thin films may be utilized in several areas of application, such as semiconductors, catalysts, or photocatalysts.
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Raghavan, Srinivasa. "TiO2 Nanostructures by Sol–Gel Processing". En Sol-Gel Method - Recent Advances [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.111440.

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This book chapter discusses the versatile sol–gel processing technique that has been used to synthesize the nanostructures of titanium dioxide (TiO2) and their different morphologies. The sol–gel syntheses of different nanostructures of TiO2, namely TiO2 nanoparticles, nanocrystalline thin film, nanorods, nanofibers, nanowires, nanotubes, aerogels, and opals are described. These nanostructures have been characterized by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) whose images clearly depict the formation of the nanostructures. Some of the morphologies of nano-TiO2 such as nanorods, nanotubes, nanofibers, nanowires, have been synthesized by sol–gel process in combination with spin-coating, dip-coating, template, surfactant, diblock polymer, micelles, polystyrene. In comparison to the bulk TiO2, presence of porous and nanocrystalline morphologies has played a role in enhancing the performance in applications such as photovoltaics, photocatalysis, photocatalytic water-splitting, H2 storage, gas sensors, photochromic, opto-electronic, and electrochromic devices. The chapter concludes with challenges and practical concerns in using the sol–gel process to produce thin films of complex oxides, porous nanostructures, solid nanorods, nanotubes, which need to be addressed in future research efforts.
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Actas de conferencias sobre el tema "Sol-Gel Dip-Coating"

1

Sekicek, G. y Z. B. B. Oral. "Ca doped ZnO thin films by sol-gel dip coating method". En PROCEEDINGS OF THE 10TH INTERNATIONAL ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE CONGRESS & EXHIBITION. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0058237.

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Hamid, Maizatul Akmam Ab y Sha Shiong Ng. "Synthesis of galium nitride thin films using sol-gel dip coating method". En ADVANCED MATERIALS FOR SUSTAINABILITY AND GROWTH: Proceedings of the 3rd Advanced Materials Conference 2016 (3rd AMC 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.5010457.

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Aksan, O. A. y Z. B. B. Oral. "Characterization of TiO2: ZnO thin films by sol-gel dip coating method". En PROCEEDINGS OF THE 10TH INTERNATIONAL ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE CONGRESS & EXHIBITION. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0058239.

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Arora, Aman, J. D. Sharma y Sonika. "Synthesis of ZnO based thin film by sol gel dip coating method". En Proceedings of the International Conference on Nanotechnology for Better Living. Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-210.

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Abhi, Sarafat Hussain, Md Shoaib Akther y Md Faruk Hossain. "Fabrication of Digital Sol-Gel DIP Coating System with Smart Beaker Carrier". En 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT). IEEE, 2019. http://dx.doi.org/10.1109/icasert.2019.8934512.

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Melninkaitis, A., K. Juškevičius, M. Maciulevičius, V. Sirutkaitis, A. Beganskienė, I. Kazadojev, A. Kareiva y D. Perednis. "Optical characterization of antireflective sol-gel coatings fabricated using dip coating method". En Boulder Damage Symposium XXXVIII: Annual Symposium on Optical Materials for High Power Lasers, editado por Gregory J. Exarhos, Arthur H. Guenther, Keith L. Lewis, Detlev Ristau, M. J. Soileau y Christopher J. Stolz. SPIE, 2006. http://dx.doi.org/10.1117/12.696270.

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He, Xiliang, Jiehua Wu, Xiangdong Gao, Lingnan Wu y Xiaomin Li. "Comparative studies of sol-gel SiO 2 thin films prepared by spin-coating and dip-coating techniques". En 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, editado por Li Yang, Yaolong Chen, Ernst-Bernhard Kley y Rongbin Li. SPIE, 2007. http://dx.doi.org/10.1117/12.782962.

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Bakar, R. A. y M. Rusop. "Electrical properties of sol-gel derived lead Titanate thin films by dip coating technique". En 2010 International Conference on Electronic Devices, Systems and Applications (ICEDSA). IEEE, 2010. http://dx.doi.org/10.1109/icedsa.2010.5503029.

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Celichowski, G. y K. Chrobak. "Improving of Tribological Properties of Nanocomposites Sol-Gel Thin Films by Fluorocyclophosphazene Derivatives". En World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64261.

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Fluorocyclophospazenes’ derivatives were used as modifiers for improving tribological properties of thin films prepared by sol-gel technique. Thin films were made on the base of aminopropyltriethoxysilane (APTS). All films were deposited by dip-coating method and post-treated by heat, UV radiation and low pressure of RF plasma. Chemical changes in sol-gel films during all steps of post-treatments and modifications were monitored by FT-IR spectroscopy and SIMS spectrometry. Topographies of modified surfaces were imaged by Atomic Force Microscopy (AFM). After final modification significant improvements of frictional properties were observed as well as their very good thermal stability.
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Shen, Chang-Bin, Hai-Feng Li, Jian-Feng Li y Yu-Zhi Xue. "Electrical and Optical Properties of ZAO Thin Films Prepared by Sol-Gel Dip-Coating Method". En 2009 Symposium on Photonics and Optoelectronics. IEEE eXpress Conference Publishing, 2009. http://dx.doi.org/10.1109/sopo.2009.5230067.

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