Journal article

Photoreversible Superhydrophobic Surfaces with Switchable Sticky-Rolling State of Water Droplets

Xiangzhong Pang, Shuaijun Pan, Shuo Feng, Hao Chen, Ling Li, Xiaolu Su, Yuanqin Xiong, Weijian Xu

MACROMOLECULAR MATERIALS AND ENGINEERING | WILEY-V C H VERLAG GMBH | Published : 2012

Abstract

A photoresponsive fluorinated azobenzene homopolymer is synthesized via TERP. UV irradiation of the surface based on a fluorinated azobenzene homopolymer with micro/nanostructures induces a tunable/switchable water droplet mobility. Water droplets can easily roll off the pristine surface at a small tilt angle (≈14°). The apparent water CA changes from 150 to 135° after UV illumination of the surface. Thus, water drops stick on the surface when the substrate is turned vertically or even upside down, indicating a very high adhesion force. Interestingly, the water droplet rolls off again under visible-light irradiation. The as-prepared surface may be useful for applications requiring switchable..

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University of Melbourne Researchers

Grants

Awarded by National Science Foundation of China


Funding Acknowledgements

We are grateful to Mr. Encai Ou, Miss. Lili Ke, and Mr. Ding Hu for their kind help in preparing the manuscript. We are obliged to Mr. Pengtao Sheng for UV-Vis absorption spectra. We would like to acknowledge funding from the National Science Foundation of China (J0830415).