Interface interaction within nanopores in thin films of an amphiphilic block copolymer and CTAB

Chengyin Wang; Deyan Wang; Xiaoya Hu; Guoxiu Wang

doi:10.1016/j.jcis.2010.10.050

Interface interaction within nanopores in thin films of an amphiphilic block copolymer and CTAB

J Colloid Interface Sci. 2011 Feb 1;354(1):219-25. doi: 10.1016/j.jcis.2010.10.050. Epub 2010 Oct 28.

Authors

Chengyin Wang¹, Deyan Wang, Xiaoya Hu, Guoxiu Wang

Affiliation

¹ College of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Environmental Engineering and Monitoring, Yangzhou University, 180 Si-Wang-Ting Road, Yangzhou 225002, China. wangcy@yzu.edu.cn

PMID: 21129753
DOI: 10.1016/j.jcis.2010.10.050

Abstract

With water droplets as sacrificed templates at a particular humidity, micro-porous solid thin films were successfully fabricated by self-assembly using an amphiphilic block polymer, polystyrene-b-polyacrylic acid (PS-b-PAA). Interface interactions between the micro-porous thin film and a cationic surfactant, cetyltrimethylammonium bromide (CTAB), are investigated by in-situ AFM in aqueous solutions. An interesting phenomenon was observed in water and CTAB solution, which the dimensions of the micropores are remarkably larger than the dimensions of those in air. The solid thin films exhibit different surface morphologies in response to stimulus by different concentrations of CTAB. These observations were explained by positing that the PAA chains in the micropores stretch and contract with interface interactions between PAA and CTAB. A promising electrochemical application of this film is suggested. This study is aimed at strategies for the functionalization of stimulus-responsive micro-porous solid thin films with tunable surface morphologies, and exploring new smart materials.