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Bell‐Shaped Superhydrophilic–Superhydrophobic–Superhydrophilic Double Transformation on a pH‐Responsive Smart Surface
Author(s) -
Cheng Mengjiao,
Liu Qian,
Ju Guannan,
Zhang Yajun,
Jiang Lei,
Shi Feng
Publication year - 2014
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201302187
Subject(s) - superhydrophilicity , wetting , monolayer , materials science , nanotechnology , chemical engineering , composite material , engineering
Superhydrophobic to neutral water droplets, superhydrophilic to acidic or basic . This double transition of surface wettability in response to a single stimulus – pH – is demonstrated for the first time. The smart surface is composed of a rough gold surface modified with a self‐assembled monolayer (SAM) containing three thiols, HS(CH 2 ) 11 CH 3 , HS(CH 2 ) 10 COOH, and HS(CH 2 ) 11 NH 2 . A ternary diagram is generated that describes wettability as a function of the SAM composition and the pH of the surrounding solution.