title: Bell-shaped superhydrophilic-superhydrophobic-superhydrophilic double transformation on a pH-responsive smart surface.
abstract: 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(CH2 )11 CH3 , HS(CH2 )10 COOH, and HS(CH2 )11 NH2 . A ternary diagram is generated that describes wettability as a function of the SAM composition and the pH of the surrounding solution.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering and Key Laboratory of Carbon Fibers and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Mengjiao
authors.initials: M
authors.lastname: Cheng
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.forename: Guannan
authors.initials: G
authors.lastname: Ju
authors.forename: Yajun
authors.initials: Y
authors.lastname: Zhang
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
authors.forename: Feng
authors.initials: F
authors.lastname: Shi
mesh_terms: D006046:Gold / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057927:Hydrophobic and Hydrophilic Interactions; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D017155:Wettability
chemical_list: D013438:Sulfhydryl Compounds; D014867:Water; D006046:Gold
keywords: pH-responsive surface; self-assembled monolayer; smart surface; superhydrophilicity; superhydrophobicity; ternary diagram