Preparation of transparent ultrahydrophobic silica film by sol–gel process

Wang, Guojian; Yang, Jinping; Shi, Quan

doi:10.1007/s11998-010-9270-5

Cited by 23 publications

(11 citation statements)

References 41 publications

(35 reference statements)

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“…5. The contact angle increased with the reaction time up to 3 h. Wang et al reported contact angles for hydrophobic silica films prepared from methyltrimethoxysilane and ethyltriethoxysilane [27]. They found the hydrophobicity of the film increased with increasing silica sol reaction time because of the number of hydrophobic groups grafted on the silica sol.…”

Section: Preparation Of the Phtms Membranes And Their Pv Propertiesmentioning

confidence: 99%

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Araki

Gondo

Imasaka

et al. 2016

Journal of Membrane Science

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Section: Preparation Of the Phtms Membranes And Their Pv Propertiesmentioning

confidence: 99%

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Araki

Gondo

Imasaka

et al. 2016

Journal of Membrane Science

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“…Wenzel e Cassieet al [15] estudaram o efeito da rugosidade sobre a molhabilidade das superfícies apontando que a variação da área de interface entre a superfície sólida e o líquido, causada pela alteração da rugosidade, afeta diretamente a tensão interfacial. Segundo Wang et al [16], em geral ocorre o aumento da hidrofobicidade do filmecom a elevação da rugosidade, mas a rugosidade da superfície deve ser inferior a 100 nm para manter o filme transparente, de modo que a hidrofobicidade e transmitância são propriedades inversamente dependentes.…”

Section: Medida Da Transmitância Na Faixa Uv-visunclassified

Estudo Da Deposição De Filmes Finos De Tio2 Por Sol-Gel E Evaporação E-Beam

Cunha¹,

Ferreira²,

Silva³

et al. 2018

ABM Proceedings

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ResumoEstudou-se as propriedades de filmes finos de TiO2 depositados em substratos de vidro.Os filmes foram obtidos pelos métodos Sol-gel e Evaporação por feixe de elétrons (e-beam) visando obter a propriedade autolimpante. Essa propriedade dos filmes de TiO2 está relacionada à hidrofilicidade fotoinduzida e pode viabilizar várias aplicações tecnológicas como a obtenção de vidros autolimpantes para módulos fotovoltaicos. O tetraisopropóxido de titânio foi utilizado como precursor no método sol-gel com deposição dip-coating. Na evaporação e-beam, partiu-se do TiO2 sólido. Os filmes passaram por diferentes tratamentos térmicos e as propriedades dos filmes obtidos pelas duas técnicas de deposição. A cristalinidade da fase anatásio foi identificada por DRX de baixo ângulo. A espessura foi medida por perfilometria e Microscopia de Força Atômica, obtendo-se valores próximos de 170 nm. Parâmetros como topografia, rugosidade e tamanho dos cristais de anatásio foram avaliados. A transmitância das placas de vidro com os filmes depositados foi medida por espectrofotometria UV-Vis. O caráter hidrofílico dos filmes finos foi comprovado por meio de medidas do ângulo de contato com água. Os filmes obtidos por ambas as técnicas apresentaram boa capacidade autolimpante devido ao efeito da hidrofilicidade fotoinduzida sob radiação UV. Palavras-chave: Dióxido de titânio; Filmes finos; Efeito autolimpante. STUDY OF TIO 2 THIN FILMS OBTAINED BY SOL-GEL METHOD AND E-BEAM EVAPORATION AbstractThe properties of TiO 2 thin films deposited on glass substrates were studied. These films were obtained by Sol-gel method and electron beam (e-beam) evaporation aimingtheir self-cleaning ability. This property of TiO 2 films may be related to photo-induced hydrophilicity and has technological applications such as self-cleaning glass photovoltaic modules. Titanium tetraisopropoxide was used as a precursor in dip-coating sol-gel method. In e-beam evaporation, TiO 2 target was used. The films have undergone different heat treatments and film properties obtained by the two deposition techniques were compared. The crystallinity of the anatase phase was identified by low angle X-ray diffraction. The thickness of the films was measured by profilometry and Atomic Force Microscopy obtaining values close to 170 nm. Parameters such as topography, roughness and crystallite size of the films were evaluated. The optical transmittance of the deposited glass films was measured by UV-Vis spectrophotometry. The hydrophilic character of the thin films was evaluated by water contact angle measurements. All these properties are important in assessing the potential application of TiO 2 films such as selfcleaning surfaces. TiO 2 films obtained by both techniques have presented good photoinduced hydrophilicity under ultraviolet light.

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“…Hydrophobic sol-gel solutions can be deposited onto the surface via spray coating [31], dip coating [32] and thermal curing step [33,34]. Indeed, low-energy surfaces of fabric can be prepared using sol-gel reactions of repellent material such as silica nanoparticles, fluorinated alkylsilane, and perfluoroalkyl compounds [35][36][37]. Fabric coating with silica-based nanosols with perfluoroalkyl compounds was used to get functional properties that are super-hydrophobic and oleophobic.…”

Section: Introductionmentioning

confidence: 99%

Micro/Nanostructured Coating for Cotton Textiles That Repel Oil, Water, and Chemical Warfare Agents

Kwon

Jung

et al. 2020

Polymers

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Using a lotus leaf as our model, we fabricated an extremely low surface energy micro/nanostructured coating for textiles that repel oil, water, and chemical warfare agents (CWAs) using a simple process that is suitable for large scale production. This coating, called “OmniBlock”, consisted of approximately 200-nm silica nanoparticles, tetraethylorthosilicate, 3-glycidoxypropyl trimethoxysilane, and a perfluorooctanoic acid-free fluoropolymer (Fluorolink S10) that was cross-linked between Si-O-Si groups via a sol-gel process. The perfluorooctanoic acid-free fluoropolymer-coated silica nanoparticles were simply applied to the surface of a cotton fabric by a dip–dry–cure process, forming dense, continuous, and uniform layers of OmniBlock coating. OmniBlock modified the surface of the cotton fibers, creating a rough, high surface area uniform coating with many micro-crevasses. As a result, n-dodecane, water, and CWAs beaded up without wetting the surface, exhibiting large contact angles of 154° for water and 121° for n-dodecane, with a small shedding angle of 5° and contact angle hysteresis of 3.2° for water. The designed coating showed excellent liquid repellence properties against three types of CWAs: 129°, 72°, and 87° for sulfur mustard (HD), soman (GD), and VX nerve agents, respectively. Furthermore, OmniBlock coating shows good mechanical properties under tensile strength and wash tests. This remarkable ability to repel CWAs is likely to have potential military applications in personal protective equipment systems requiring self-cleaning functions.

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Preparation of transparent ultrahydrophobic silica film by sol–gel process

Cited by 23 publications

References 41 publications

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Permeation properties of organic compounds from aqueous solutions through hydrophobic silica membranes with different functional groups by pervaporation

Estudo Da Deposição De Filmes Finos De Tio2 Por Sol-Gel E Evaporação E-Beam

Micro/Nanostructured Coating for Cotton Textiles That Repel Oil, Water, and Chemical Warfare Agents

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