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Issue 15, 2012
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Transparent superhydrophobic/superhydrophilic TiO2-based coatings for self-cleaning and anti-fogging

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Abstract

A stable titanate nanobelt (TNB) particle suspension was prepared by a hydrogen-bond-driven assembly of pre-hydrolysed fluoroalkylsilane (FAS) on its surface. A one-step electrophoretic deposition was applied to fabricate a transparent cross-aligned superhydrophobic TNB/FAS film on a conducting glass substrate. By controlling the deposition time, we have shown the transition between a “sticky” hydrophobic state (high contact angle with strong adhesion) and a “sliding” superhydrophobic state (high contact angle with weak adhesion). The optical transmittance can reach as high as 80% throughout most of the visible light region of the spectrum. These coatings have also displayed high chemical stability and self-cleaning ability. Upon heating the hydrophobic coatings at 500 °C, the TNB coating transforms into a porous TiO2(B) structure with superhydrophilic behavior and could be used for anti-fogging applications. With this TiO2-based system, we have demonstrated three different wetting states: superhydrophobicity with weak adhesion, high hydrophobicity with strong adhesion, and superhydrophilicity with immediate water spreading. Moreover, this work has also demonstrated superhydrophobic TNB/FAS films with high chemical stability and good self-cleaning performance and superhydrophilic pore-like TiO2(B) films with rapid water spreading and excellent anti-fogging ability.

Graphical abstract: Transparent superhydrophobic/superhydrophilic TiO2-based coatings for self-cleaning and anti-fogging

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Supplementary files

Article information


Submitted
01 Dec 2011
Accepted
07 Feb 2012
First published
08 Mar 2012

J. Mater. Chem., 2012,22, 7420-7426
Article type
Paper

Transparent superhydrophobic/superhydrophilic TiO2-based coatings for self-cleaning and anti-fogging

Y. Lai, Y. Tang, J. Gong, D. Gong, L. Chi, C. Lin and Z. Chen, J. Mater. Chem., 2012, 22, 7420
DOI: 10.1039/C2JM16298A

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