Transparent, non-fluorinated, hydrophobic silica coatings with improved mechanical properties

被引：37

作者：

Jeevajothi, K. ^{[1
,2
]}

Subasri, R. ^{[1
]}

Raju, K. R. C. Soma ^{[1
]}

机构：

[1] Int Adv Res Ctr Powder Met & New Mat ARCI, Hyderabad 500005, Andhra Pradesh, India

[2] CIPET, Dept Plast Technol, Plast Testing Ctr, Madras 600032, Tamil Nadu, India

来源：

CERAMICS INTERNATIONAL | 2013年 / 39卷 / 02期

关键词：

Films; Sol-gel processes; Hardness; Optical properties; Functional applications;

D O I：

10.1016/j.ceramint.2012.07.019

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Non-fluorinated, hydrophobic silica coatings were generated on soda lime glass substrates using dimethyldiethoxysilane (DMDEOS), tetraethoxysilane (TEOS) and a silylating agent hexamethyldisilazane (HMDS) using sol-gel process. To improve the mechanical properties of the coating, epoxy modified nanosilica particles were added to the sol of dimethyldiethoxysilane, tetraethoxysilane and hexamethyldisilazane followed by sonication prior to coating. Coatings were characterized for their water contact angles, thickness, UV-Vis transmission, pencil hardness and surface morphology. The concentrations of the nanosilica particles as well as the sonication times were optimized to obtain a transparent, hydrophobic coating with improved pencil scratch hardness. An optimized coating composition with 1: 0.5 M ratio of the nanosilica particles and sol synthesized from DMDEOS, TEOS and HMDS sonicated for 60 min yielded coatings that exhibited a water contact angle of 125 +/- 2 degrees with a pencil scratch hardness of HB and average visible light transmittance of 89%. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：2111 / 2116

页数：6

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