Optically transparent, superhydrophobic methyltrimethoxysilane based silica coatings without silylating reagent
Optically transparent, superhydrophobic methyltrimethoxysilane based silica coatings without silylating reagent
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DOI：
10.1016/j.apsusc.2011.08.023
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发表时间：
2011-10-15
影响因子：
6.7
通讯作者：
Barshilia, Harish C.
中科院分区：
文献类型：
--
作者：
Kavale, Mahendra S.;Mahadik, D. B.;Barshilia, Harish C.
超疏水表面由于具有光学透明性、粘附性和自洁性，在学术界和工业界都引起了极大的关注。涂层表面的化学成分和形貌对决定涂层表面的超疏水性质起着重要作用。在溶胶-凝胶法中采用表面改性剂或共前驱体的方法可以实现这种非润湿性的协调。已经尝试使用聚甲基丙烯酸甲酯(PMMA)来提高基于甲基三甲氧基硅烷(MTMS)的二氧化硅涂层的疏水性和光学透明度，而不是使用硅烷化试剂进行表面改性之类的正式途径。通过简单的浸渍镀膜法获得了光学透明、超疏水的均匀涂层。在0.5M NH4F催化下，MTMS：MeOH：H2O的摩尔比为1：5.63：1.58，PMMA的质量分数为1~8。通过FTIR和接触角测试分析了二氧化硅涂层的疏水性。与高达171+/-1度的玻璃和水滴接触角相比，这些基板具有91%的光学透过率。通过在30℃恒温、相对湿度为90%的条件下曝光45天，研究了湿度对涂层疏水性的影响。用透射电子显微镜对其微观结构进行了研究。(C)2011爱思唯尔B.V.保留所有权利。
The superhydrophobic surfaces have drawn lot of interest, in both academic and industries because of optically transparent, adherent and self-cleaning behavior. Surface chemical composition and morphology plays an important role in determining the superhydrophobic nature of coating surface. Such concert of non-wettability can be achieved, using surface modifying reagents or co-precursor method in sol-gel process. Attempts have been made to increase the hydrophobicity and optical transparency of methyltrimethoxysilane (MTMS) based silica coatings using polymethylmethacrylate (PMMA) instead of formal routes like surface modification using silylating reagents. The optically transparent, superhydrophobic uniform coatings were obtained by simple dip coating method. The molar ratio of MTMS:MeOH:H2O was kept constant at 1:5.63:1.58, respectively with 0.5 M NH4F as a catalyst and the weight percent of PMMA varied from 1 to 8. The hydrophobicity of silica coatings was analyzed by FTIR and contact angle measurements. These substrates exhibited 91% optical transmittance as compared to glass and water drop contact angle as high as 171 +/- 1 degrees. The effect of humidity on hydrophobic nature of coating has been studied by exposing these films at relative humidity of 90% at constant temperature of 30 degrees C for a period of 45 days. The micro-structural studies carried out by transmission electron microscopy (TEM). (C) 2011 Elsevier B.V. All rights reserved.