Article

Tunable wettability and rewritable wettability gradient from superhydrophilicity to superhydrophobicity.

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.
Langmuir (impact factor: 4.19). 04/2010; 26(14):12203-8. DOI:10.1021/la101064c pp.12203-8
Source: PubMed

ABSTRACT A simple method for the fabrication of tunable surfaces with wettability that can be manipulated rapidly and reversibly from superhydrophilicity to superhydrophobicity is reported. A polyelectrolyte multilayer (PEM) was deposited on a rough substrate, and via ion exchange of the counterion in the PEM, the water contact angle of the surface was switched between <5 degrees and 164 degrees. By controlling the ion-exchange kinetics, on the same surface, completely erasable, rewritable gradient wettability from superhydrophilicity to superhydrophobicity was conveniently achieved.

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Keywords

ion exchange
 
ion-exchange kinetics
 
PEM
 
polyelectrolyte multilayer
 
reversibly
 
rewritable gradient wettability
 
rough substrate
 
simple method
 
water contact angle
 

Liming Wang