Optically transparent, superhydrophobic methyltrimethoxysilane based silica coatings without silylating reagent

Kavale, Mahendra S.; Mahadik, D. B.; Parale, Vinayak G.; Wagh, P. B.; Gupta, Satish C.; Rao, A. Venkateswara; Barshilia, Harish C.

doi:10.1016/j.apsusc.2011.08.023

Cited by 73 publications

(31 citation statements)

References 26 publications

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“…The water repellent capability of hydrophobic coatings gradually degrades during long-term outdoor exposure and contaminant accumulation. This might be due to the presence of a moisture adsorption from the atmosphere by the polar -OH bonds in silica coating [22]. It is supported by the previous research stating that constructing hydrophobic glass using sol-gel technique has poor moisture resistance due to the existence of hydroxyl group [23].…”

Section: The Stability Of Hydrophobic Coating On the Glass Surfacementioning

confidence: 71%

Preparation of Water Repellent Layer on Glass Using Hydrophobic Compound Modified Rice Hull Ash Silica

et al. 2018

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In this study water repellent layered glass has been prepared by coating silica (SiO2) combined with a hydrophobic silane compound. SiO2 was extracted from rice hull ash and two silane compounds, namely hexadecyltrimethoxysilane (HDTMS) and trimethylchlorosilane (TMCS) were used. Coating was performed through two deposition techniques, i.e. one step (mono-layer) and layer by layer (LBL, multi-layer). The effect of silane to SiO2 mole ratio, silane type and layer number on the glass characters was evaluated. Characterization included hydrophobicity, transparency, surface roughness and stability of coating. Results showed that increasing the mole ratio of silane to SiO2 and the layer number increased the hydrophobicity of the glass surface. The optimum mole ratio was 5:1 and the significant increase of contact angle occurred at lower mole ratio, but the stability tends to be increased at higher mole ratio. For HDTMS-SiO2 layer, the technique of LBL technique produced a coating with higher hydrophobicity and transparency than single-stage one. The LBL technique produced the highest water contact angle of 103.7° with transmittance of 96%, while for TMCS-SiO2 layer the one stage technique produced hydrophobic layer with higher water contact angle of 108.0° and transparency about 94.52%. The prepared hydrophobic glasses were relatively stable in polar and non-polar solvents, but unstable to ambient conditions.

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Section: The Stability Of Hydrophobic Coating On the Glass Surfacementioning

confidence: 71%

Preparation of Water Repellent Layer on Glass Using Hydrophobic Compound Modified Rice Hull Ash Silica

et al. 2018

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“…Figure 8c,d are the infrared spectra of TW from Betula alnoides and New Zealand pine. After resin impregnation polymerization, TW not only has part of the characteristic absorption peak of the wood, but also has the characteristic peak of PMMA (2992 −1 and 2950 cm −1 for C−H, 1740 cm −1 for C=O, and 1191 and 1145 cm −1 for C−O) [32], which shows that PMMA and wood template have good synergistic effect.…”

Section: Specific Surface Area and Pore Size Distribution Analysismentioning

confidence: 97%

Study on the Properties of Partially Transparent Wood under Different Delignification Processes

Zhou

Huang³

et al. 2020

Polymers

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Two common tree species of Betula alnoides (Betula) and New Zealand pine (Pinups radiata D. Don) were selected as the raw materials to prepare for the partially transparent wood (TW) in this study. Although the sample is transparent in a broad sense, it has color and pattern, so it is not absolutely colorless and transparent, and is therefore called partially transparent. For ease of interpretation, the following "partially transparent wood" is referred to as "transparent wood (TW)". The wood template (FW) was prepared by removing part of the lignin with the acid delignification method, and then the transparent wood was obtained by impregnating the wood template with a refractive-index-matched resin. The goal of this study is to achieve transparency of the wood (the light transmittance of the prepared transparent wood should be improved as much as possible) by exploring the partial delignification process of different tree species on the basis of retaining the aesthetics, texture and mechanical strength of the original wood. Therefore, in the process of removing partial lignin by the acid delignification method, the orthogonal test method was used to explore the better process conditions for the preparation of transparent wood. The tests of color difference, light transmittance, porosity, microstructure, chemical groups, mechanical strength were carried out on the wood templates and transparent wood under different experimental conditions. In addition, through the three major elements (lignin, cellulose, hemicellulose) test and orthogonal range analysis method, the influence of each process factor on the lignin removal of each tree species was obtained. It was finally obtained that the two tree species acquired the highest light transmittance at the experimental level 9 (process parameters: NaClO 2 concentration 1 wt%, 90 • C, 1.5 h); and the transparent wood retained most of the color and texture of the original wood under partial delignification up to 4.84-11.07%, while the mechanical strength with 57.76% improved and light transmittance with 14.14% higher than these properties of the original wood at most. In addition, the wood template and resin have a good synergy effect from multifaceted analysis, which showed that this kind of transparent wood has the potential to become the functional decorative material.

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“…For PMMA, various approaches have been used to turn its weakly hydrophobic nature into super-hydrophobic, including replicating, imprinting, and mesh-assisted via mold [2][3][4][5]; lithography and soft-lithography [6][7][8][9], plasma etching [10][11][12][13][14], and vapor deposition [15]; solutions of mixing two or more different kinds of powders [16][17][18][19][20][21][22][23][24][25][26], and different powder grain sizes [27][28][29][30]; fluoride coated surfaces [31,32]; and electrospinning and electrospraying [33]. In contrast, we have been concentrated on developing lower cost and simpler methods.…”

Section: Introductionmentioning

confidence: 99%

A facile low-temperature and low-cost process for fabricating super-hydrophobic surface on acrylic

Lin

Chou

2015

J Mater Sci

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In this paper, we present a facile low-temperature and low-cost water-dissolved filler process for fabricating super-hydrophobic surfaces on acrylic. The fillers are salt grains which are pressed into acrylic by pressure and moisturized by solvent first. Then they are dissolved in water by rinsing to create micro-scale structures on the acrylic surface. The process uses no costly equipment, and is capable of making large surfaces, whereas salt grains can be recycled after rinsing by heating. Most of the fabricated surfaces without any coating have contact angles[150°but slide angle larger than 10°. After coating with PDMS gas at 60°C, all the fabricated surfaces become super-hydrophobic with slide angles \10°. That is, the present method can turn the originally weakly hydrophobic acrylic surface into super-hydrophobic by coating with PDMS gas by a low-cost process.

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Optically transparent, superhydrophobic methyltrimethoxysilane based silica coatings without silylating reagent

Cited by 73 publications

References 26 publications

Preparation of Water Repellent Layer on Glass Using Hydrophobic Compound Modified Rice Hull Ash Silica

Preparation of Water Repellent Layer on Glass Using Hydrophobic Compound Modified Rice Hull Ash Silica

Study on the Properties of Partially Transparent Wood under Different Delignification Processes

A facile low-temperature and low-cost process for fabricating super-hydrophobic surface on acrylic

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