pH Dependent Elasticity of Polystyrene-block-poly(acrylic acid) Vesicle Shell Membranes by Atomic Force Microscopy

被引：14
作者：
Chen, Qi [1 ]
Vancso, G. Julius [1 ]
机构：
[1] Twente Univ Technol, Dept Mat Sci & Technol Polymers, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2011年 / 32卷 / 21期
关键词：
atomic force microscopy; block copolymer vesicles; membrane mechanical properties; nano-indentation; stimuli-responsive materials; BLOCK-COPOLYMER VESICLES; MECHANICAL-PROPERTIES;
D O I：
10.1002/marc.201100332
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We assess the elastic properties of PS-b-PAA vesicle membranes under different pH values by AFM force measurements. We find that based on the shell deformation theory, the values of the estimated apparent Young's modulus of the vesicle membranes decrease as the pH of the solution increases. The onset of the decrease of E coincides with the surface pK(a) determined from zeta-potential measurements. This decrease of E at higher pH is attributed to electrostatic repulsion between the deprotonated PAA chains resulting in the thinning of the vesicle membrane.
引用
收藏
页码：1704 / 1709
页数：6
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