Coating of colloidal particles by controlled precipitation of polymers

被引：45

作者：

Dudnik, V ^{[1
]}

Sukhorukov, GB

Radtchenko, IL

Möhwald, H

机构：

[1] Max Planck Inst Colloids & Interfaces, D-14476 Potsdam, Germany

[2] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada

[3] Russian Acad Sci, Inst Crystallog, Moscow 117333, Russia

来源：

MACROMOLECULES | 2001年 / 34卷 / 07期

关键词：

D O I：

10.1021/ma0012907

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A method is suggested for the coating of micron-sized particles by polymeric films based on surface-controlled precipitation. Polymer particles were coated by dextran and DNA in a water/ethanol mixture containing multivalent cations. A theoretical model for depositing polymers on colloidal particles is presented using the Smoluchowski solution for diffusion-controlled irreversible coagulation. Theoretical estimations appear to provide the proper particle and polymer concentration ranges in order to achieve smooth coverage. The optimal concentration range also was determined experimentally and agrees with the theoretical calculations. The controlled precipitation method of assembling thin films on colloids is compared with the layer-by-layer adsorption approach. Advantages and drawbacks of both approaches are discussed.

引用

页码：2329 / 2334

页数：6

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