Detecting zeta potential of polydimethylsiloxane (PDMS) in electrolyte solutions with atomic force microscope

被引：17

作者：

Liu, Zhijian ^{[1
]}

Song, Yongxin ^{[1
]}

Li, Dongqing ^{[2
]}

机构：

[1] Dalian Maritime Univ, Dept Marine Engn, Dalian 116026, Peoples R China

[2] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2020年 / 578卷

基金：

中国国家自然科学基金; 加拿大自然科学与工程研究理事会;

关键词：

Zeta potential; PDMS; Air plasma treatment; Liquid aging; AFM; DOUBLE-LAYER; SURFACE; FLOW; POLY(DIMETHYLSILOXANE); PARTICLES;

D O I：

10.1016/j.jcis.2020.05.061

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Zeta potential of PDMS-liquid interface is an important parameter for generating electroosmotic flow in a PDMS microchannel. In this paper, the zeta potentials of a PDMS slab in contacting with electrolyte solutions were evaluated with an atomic force microscope (AFM). As a colloidal probe of the AFM approaches to the surface of a PDMS slab in an electrolyte solution, a force curve is obtained and used to calculate the zeta potential of the PDMS. The effects of the plasma treating time and the aging of the electrolyte solutions on the zeta potential of PDMS surfaces were examined. The experimental results show that the air plasma treating time does not change the zeta potential of PDMS appreciably. Furthermore, the decreased zeta potential of a plasma-treated PDMS in an electrolyte solution is due to liquid aging, not the PDMS itself. Such characteristics probed by AFM provide new understanding of the surface charges of PDMS in electrolyte solutions. (C) 2020 Elsevier Inc. All rights reserved.

引用

页码：116 / 123

页数：8

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