Salt-induced swelling-to-shrinking transition in polyelectrolyte multilayer capsules

被引：69

作者：

Koehler, Karen ^{[1
]}

Biesheuvel, P. Maarten ^{[1
]}

Weinkamer, Richard ^{[1
]}

Moehwald, Helmuth ^{[1
]}

Sukhorukov, Gleb B. ^{[1
]}

机构：

[1] Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 18期

关键词：

MICROCAPSULES; TEMPERATURE;

D O I：

10.1103/PhysRevLett.97.188301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the size of polyelectrolyte multilayer capsules as a function of ionic strength, temperature, and time. A dynamic micromechanical model is developed which successfully describes the experiments. The model includes the polymer-solvent surface tension, an electrostatic force which is strongly ionic strength dependent, and a temperature-dependent mobility parameter. The activation of > 50 kT suggests that multiple ion pairs must be broken simultaneously in the process of chain rearrangement. In support of our physical model capsules can repeatedly swell and shrink by varying ionic strength.

引用

页数：4

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