UV and thermally stable superhydrophobic coatings from sol-gel processing

被引：132

作者：

Xiu, Yonghao ^{[1
,2
]}

Hess, Dennis W. ^{[1
]}

Wong, C. R. ^{[2
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2008年 / 326卷 / 02期

基金：

美国国家科学基金会;

关键词：

silica; thin film; superhydrophobicity; fluoroalkyl silane; UV stability; thermal stability; accelerated UV weathering test;

D O I：

10.1016/j.jcis.2008.06.042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A method for the preparation of inorganic superhydrophobic silica coatings using sol-gel processing with tetramethoxysilane and isobutyltrimethoxysilane as precursors is described. Incorporation of isobutyltrimethoxysilane into silica layers resulted in the existence of hydrophobic isobutyl surface groups, thereby generating surface hydrophobicity. When combined with the surface roughness that resulted from sol-gel processing, a superhydrophobic surface was achieved. This surface showed improved UV and thermal stability compared to superhydrophobic surfaces generated from polybutadiene by plasma etching. Under prolonged UV tests (ASTM D 4329), these surfaces gradually lost superhydrophobic character. However, when the as-prepared superhydrophobic surface was treated at 500 degrees C to remove the organic moieties and covered with a fluoroalkyl layer by a perfluorooctylsilane treatment, the surface regained superhydrophobicity. The UV and thermal stability of these Surfaces was maintained upon exposure to temperatures up to 400 degrees C and UV testing times of 5500 h. Contact angles remained >160 degrees with contact angle hysteresis similar to 2 degrees. (c) 2008 Elsevier Inc. All rights reserved.

引用

页码：465 / 470

页数：6

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