Study on the hydrophobic surfaces prepared by two-step sol-gel process

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题名:	Study on the hydrophobic surfaces prepared by two-step sol-gel process
作者:	Huang,SI;Shen,YJ;Chen,H
贡献者:	化學工程與材料工程學系
关键词:	SILICA AEROGELS;SI-29 NMR;HYDROLYSIS;FILMS;METHYLTRIMETHOXYSILANE;TETRAETHOXYSILANE;POLYCONDENSATION;GLASS
日期:	2009
上传时间:	2010-06-29 17:28:00 (UTC+8)
出版者:	中央大學
摘要:	In this study, the two-step sol-gel process was used to prepare hydrophobic coating films on the glass substrates. The first step was to add hydrogen chloride into TEOS (tetraethoxysilane) solution, and then the second step was to add ammonia into the above reacted solution. We adopted different amount of hydrogen chloride and ammonia to control the sol-gel reaction and observed the change of the viscosity, gelatin period of the solution and contact angles of the coating films. By this method, we created a surface with roughness and then the hydroxyl groups were terminated by adding trimethylchlorosilane (TMCS) to produce a hydrophobic coating layer. The amount of the acid, base and water added in the solution influenced the reaction rate and resulted in the aggregation and condensation of the particles to form rough surfaces. Consequently, the rough surfaces made by aggregation and condensation of the large particles, which were modified by TMCS resulted in higher contact angles (> 140 degrees). In this study, a surface with contact angle 150 degrees was obtained. (c) 2009 Elsevier B.V. All rights reserved.
關聯:	APPLIED SURFACE SCIENCE
显示于类别:	[化學工程與材料工程研究所] 期刊論文

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