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Photoreversible Superhydrophobic Surfaces with Switchable Sticky‐Rolling State of Water Droplets
Author(s) -
Pang Xiangzhong,
Pan Shuaijun,
Feng Shuo,
Chen Hao,
Li Ling,
Su Xiaolu,
Xiong Yuanqin,
Xu Weijian
Publication year - 2012
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201100386
Subject(s) - azobenzene , materials science , contact angle , adhesion , irradiation , substrate (aquarium) , wetting , nanostructure , tilt (camera) , chemical engineering , nanotechnology , composite material , polymer , geology , mechanical engineering , oceanography , physics , nuclear physics , engineering
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 mobility of water droplets.