Control of Large-scale Wettability Using Micro-amounts of Selective Solvents

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (11): 2301.

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Control of Large-scale Wettability Using Micro-amounts of Selective Solvents

ZHAO Tian-Yi^1,2, ZHANG Yong¹, LIU Huan¹, WANG Shu-Tao¹, ZHANG Zhi-Jie^1*, JIANG Lei^1*

1. Center of Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2009-03-17 Online:2009-11-10 Published:2009-11-10
Contact: ZHANG Zhi-Jie, E-mail: zhangzj@iccas.ac.cn; JIANG Lei, E-mail: jianglei@iccas.ac.cn
Supported by:
国家自然科学基金(批准号: 20571077)资助.

Abstract

Abstract:

A simple approach was used to control the large-scale wettability of polymer-coated surfaces merely by adding micro-amounts of selective solvents of different polarity to tri-block copolymer solutions. An amphiphilic tri-block copolymer, poly(ethylene oxide)-poly(dimethylsiloxane)-poly(ethylene oxide)(PEO-PDMS-PEO), was used to form micelles and reverse micelles by adding micro-amounts of a selective solvent to the initial solution. The micellar and reverse micellar film coatings show different wettability from hydrophilic to hydrophobic, and even from superhydrophilic to superhydrophobic when micro-scale roughness is involved. The structures of the micelles and reverse micelles were studied by transmission electron microscopy and ato-mic force microscopy, and the surface chemical composition of the film coatings was determined by X-ray photoelectron spectroscopy(XPS). The results reveal that the main cause of differences in wettability is the diffe-rent surface chemical compositions induced by the different structures of micelles and reverse micelles.

Key words: Block copolymer; Polymer film; Micro-amount selective solvent; Control of wettability

TrendMD:

ZHAO Tian-Yi, ZHANG Yong, LIU Huan, WANG Shu-Tao, ZHANG Zhi-Jie*, JIANG Lei. Control of Large-scale Wettability Using Micro-amounts of Selective Solvents[J]. Chem. J. Chinese Universities, 2009, 30(11): 2301.

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Control of Large-scale Wettability Using Micro-amounts of Selective Solvents

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