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A Superamphiphobic Coating with an Ammonia‐Triggered Transition to Superhydrophilic and Superoleophobic for Oil–Water Separation
Author(s) -
Xu Zhiguang,
Zhao Yan,
Wang Hongxia,
Wang Xungai,
Lin Tong
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201411283
Subject(s) - superhydrophilicity , coating , materials science , chemical engineering , polyester , filtration (mathematics) , nanoparticle , ammonia , polyurethane , contact angle , nanotechnology , composite material , organic chemistry , chemistry , mathematics , engineering , statistics
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 TiO 2 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.