Sol-gel based antireflective coatings with superhydrophobicity and exceptionally low refractive indices built from trimethylsilanized hollow silica nanoparticles

Tao, Chaoyou; Yan, Hongwei; Yuan, Xiaodong; Yin, Qiang; Zhu, Jianping; Ni, Wei; Yan, Lianghong; Zhang, Lin

doi:10.1016/j.colsurfa.2016.08.055

Cited by 57 publications

(16 citation statements)

References 27 publications

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“…Preparing a superhydrophobic surface from commonly hydrophobic material without addition of low surface energy ingredients is commercially important. Highly porous silica‐based coatings are highly desirable materials that can be used for preparing AR coatings as a result of their high accessible surface area, low dielectric constant, and adjustable refractive index . Facile and general duty strategy of one‐step sol–gel process was adopted to obtain high transmittance and hydrophobic antireflective coatings .…”

Section: Fabrication Of Superhydrophobic Surfacementioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

108

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decades, researchers have shown great interests in bionics, which was a new multidisciplinary subject inspired by biological characteristics and features to imitate it to build technology devices. [1] With the rise of biomimetic biomaterial researches, a lot of attention was paid on the observation of living organism, especially on plant leaves, such as lotus, rice, taro leaves, etc. [2] As the development of scanning electron microscope (SEM), a wealth of data dealing with SEM of plant surface has been published since 1960s. [3] The cuticular structure was investigated with regard to function, and substances that were secreted onto the cuticle had great effects on the surface properties, while intracuticular waxes were the main barrier to wettability. [4] Some kinds of special wettability like superhydrophobicity and superhydrophilicity were also found in other surfaces, such as self-cleaning lotus leaf, [5] hydrophilicity of red rose petals, [6,7] the anisotropic dewetting behavior on rice leaf, [8,9] hydrophobicity of shark skin, [10] gecko toe, [11] insect wings, [12] etc., and striking superhydrophobic force provided by a water strider's legs, [13] and they were all related to the unique microstructures on their surface. In fact, the special wettability of surfaces is attributed to the interaction of both the surface microstructures and surface covers. As the development and progress of the observation device, smaller nanosized structures were found on the microstructure, and better properties of multiscale hierarchical structure was shown then. [14] Wetting is a phenomenon that solid interface was transferred from solid-gas interface to solid-liquid interface, wettability was a kind of ability that a liquid could be unfolded on one solid surface. The wettability of surface could be characterized by contact angle (CA) of interface. Sliding angle (SA) and contact angle hysteresis were introduced to evaluate the highly valued superhydrophobicity and superhydrophilicity of surfaces. Superhydrophilicity was defied as that of CA was smaller than 5°, superhydrophobicity was defied as that of CA was greater than 150°, as well as a really small sliding angle. It is worth noting that many researchers applied themselves to excavate the theories under the phenomena. Young's equation, Wenzel equation, and Cassie-Baxter equation [15,16] were the representations of hundreds years of research results. Improving and developing Surfaces of plants and animals are evolved to optimal states to accommodate environments better after billions of years of natural selection. As the development of further study on bionics, surfaces with special wetting properties in nature are discovered, extremely related to the micro-/nanostructures on surface. The wetting models and wetting mechanism of several surfaces in nature are investigated, followed by lifting the veil of superhydrophobic field. Various facile, effective, and convenient methods for fabricating superhydrophobic surfaces are obtained and optimized in scientific research and ...

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Section: Fabrication Of Superhydrophobic Surfacementioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

108

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“…[37][38][39] The characteristic peaks at 2961 cm À 1 and 2900 cm À 1 correspond to the stretching vibration absorption of À CH 3 , [40][41][42] the characteristic peak at 1255 cm À 1 corresponds to the symmetrical stretching vibration of SiÀ CH 3 , and the characteristic peak at 755 cm À 1 corresponds to the stretching vibration of -SiÀ (CH 3 ) 3 . [38,40,43] With the increase of TMES addition amount, the characteristic peak intensity of SiÀ OH decreased, while that for those characteristic peaks of SiÀ OÀ Si, À CH 3 , SiÀ CH 3 and À SiÀ (CH 3 ) 3 increased. This meant that more hydrophilic hydroxyl groups reacted and more hydrophobic methyl groups were introduced into SiO 2 , which was beneficial to reduce the surface energy of SiO 2 and to increase its hydrophobicity.…”

Section: Ftir Analysis Of Modified Siomentioning

confidence: 99%

Preparation of Fluorine‐Free and Superhydrophobic SiO₂ Film with High Transmittance

2020

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Superhydrophobic film has broad application prospect in daily life. Herein, superhydrophobic SiO2 film was prepared with chemical modification reducing the film's surface energy and sol mixing increasing its surface roughness. Tetraethoxysilane (TEOS) was used as precursor, trimethylethoxysilane (TMES) was used as modifier. Both the modified SiO2 film and the mixed SiO2 film were obtained with dip‐coating. With the increase of TMES addition, the characteristic peak intensity of hydrophilic hydroxyl group in Fourier transform infrared spectrum (FTIR) decreased, and that of the hydrophobic methyl group increased; the modified SiO2 film surface was relatively smooth and its root‐mean‐square (RMS) roughness ranged 1.86‐5.41 nm, while that of the mixed SiO2 film increased from 11.20 nm to 42.60 nm; the contact angle of the modified SiO2 film increased from 19.08° to 127.37°, while that of the mixed SiO2 film increased from 129.47° to 158.47°; the average transmittance of the modified SiO2 film first decreased from 94.86 % to 94.14 % and then increased to 94.43 %, while that of the mixed SiO2 film decreased gradually from 96.99 % to 94.84 %. Finally, the fluorine‐free superhydrophobic SiO2 film with the average contact angle of 158.47° and the average transmittance of 94.84 % was obtained.

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“…The HSNs were prepared by the modified Stöber method [18]. In accordance with previous work [16,19,20], 0.15 g PAA was dissolved in 7 mL ammonia hydroxide at room temperature and then mixed with 180 mL of ethanol in a 250-mL glass conical flask. After that, 1 mL Tetraethoxysilicate (TEOS, < 98 %) was gradually injected into the solution within 5 hrs under vigorous magnetic stirring at 30 ∘ C. Finally, the synthetic HSN solution (RI 1.2, particle diameter ∼40nm) was obtained.…”

Section: Synthesis Of Hsns and Meniscusmentioning

confidence: 99%

Micro/Nanofiber with Hollow Silica Nanoparticles Thin-Film for Airborne Molecular Contaminants Real-Time Sensing

Niu

Zhou

Miao

et al. 2018

Advances in Condensed Matter Physics

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A novel chemical sensing approach detecting airborne molecular contaminants (AMCs) or compounds is demonstrated by using single-mode optical microfibre (OMF) coated with hollow silica nanoparticles (HSNs). The concentration of AMCs, which were volatilized on the surface of the tapered microfibre coated with HSNs, influences the transmission loss of the microfibre. Tapered OMF was fabricated using a high-precision electrically controlled setup, and coatings of HSNs were prepared by meniscus coating method. The transmission loss of three OMFs with different diameters and the same thick coating were tested to determine the relationship between AMC concentrations and transmission loss of coated OMFs. Experimental results showed that the transmission loss increases with increasing concentration of AMCs. The sensitivity for volatile simethicone was 0.0263 dB/mg/m3 obtained by the coated OMF with diameter of 2.5 μm, and the sensitivity values of coated OMF with diameters of 5 μm and 6 μm were 0.0024 and 0.0018 dB/mg/m3, respectively. Thus the proposed coated OMF can be used in enclosed space for AMCs sensing.

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Sol-gel based antireflective coatings with superhydrophobicity and exceptionally low refractive indices built from trimethylsilanized hollow silica nanoparticles

Cited by 57 publications

References 27 publications

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Preparation of Fluorine‐Free and Superhydrophobic SiO₂ Film with High Transmittance

Micro/Nanofiber with Hollow Silica Nanoparticles Thin-Film for Airborne Molecular Contaminants Real-Time Sensing

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Sol-gel based antireflective coatings with superhydrophobicity and exceptionally low refractive indices built from trimethylsilanized hollow silica nanoparticles

Cited by 57 publications

References 27 publications

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Preparation of Fluorine‐Free and Superhydrophobic SiO2 Film with High Transmittance

Micro/Nanofiber with Hollow Silica Nanoparticles Thin-Film for Airborne Molecular Contaminants Real-Time Sensing

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Preparation of Fluorine‐Free and Superhydrophobic SiO₂ Film with High Transmittance