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A superamphiphobic coating with an ammonia-triggered transition to superhydrophilic and superoleophobic for oil-water separation
journal contributionposted on 2015-04-07, 00:00 authored by Zhiguang Xu, Yan Zhao, Hong WangHong Wang, Xungai Wang, Tong Lin
Superhydrophilic and superoleophobic materials are very attractive for efficient and cost-effective oil-water separation, but also very challenging to prepare. Reported herein is a new superamphiphobic coating that turns superhydrophilic and superoleophobic upon ammonia exposure. The coating is prepared from a mixture of silica nanoparticles and heptadecafluorononanoic acid-modified TiO2 sol by a facile dip-coating method. Commonly used materials, including polyester fabric and polyurethane sponge, modified with this coating show unusual capabilities for controllable filtration of an oil-water mixture and selective removal of water from bulk oil. We anticipate that this novel coating may lead to the development of advanced oil-water separation techniques.