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Superhydrophobic fabrics from hybrid silica sol-gel coatings: Structural effect of precursors on wettability and washing durability

Published online by Cambridge University Press:  31 January 2011

Hongxia Wang ,
Jie Ding ,
Yuhua Xue ,
Xungai Wang  and
Tong Lin
Hongxia Wang
Affiliation:
Centre for Material and Fibre Innovation, Deakin University, Geelong, VIC 3217 Australia
Jie Ding
Affiliation:
Human Protection and Performance Division, Defence Science & Technology Organisation (DSTO), Melbourne, VIC 3207 Australia
Tong Lin*
Affiliation:
Centre for Material and Fibre Innovation, Deakin University, Geelong, VIC 3217 Australia
*
a)Address all correspondence to this author. e-mail: tongl@deakin.edu.au
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Abstract

Particle-containing silica sol was synthesized by co-hydrolysis and co-condensation of two silane precursors, tetraethylorthosilicate (TEOS) and an organic silane composed of a non-hydrolyzable functional group (e.g., alkyl, fluorinated alkyl, and phenyl), and used to produce superhydrophobic coatings on fabrics. It has been revealed that the non-hydrolyzable functional groups in the organic silanes have a considerable influence on the fabric surface wettability. When the functional group was long chain alkyl (C16), phenyl, or fluorinated alkyl (C8), the treated surfaces were highly superhydrophobic with a water contact angle (CA) greater than 170°, and the CA value was little affected by the fabric type. The washing durability of the superhydrophobic coating was improved by introducing the third silane containing epoxide group, 3-glycidoxypropyltrimethoxysilane (GPTMS), for synthesis. Although the presence of epoxide groups in the coating slightly reduced the fabrics' superhydrophobicity, the washing durability was considerably improved when polyester and cotton fabrics were used as substrates.

Keywords

CoatingSol-gelThin film
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1336 - 1343
Copyright
Copyright © Materials Research Society 2010

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