Attractive Electrostatic Forces between Identical Colloidal Particles Induced by Adsorbed Polyelectrolytes

被引：66

作者：

Popa, Ionel ^{[1
]}

Gillies, Graeme ^{[1
]}

Papastavrou, Georg ^{[1
]}

Borkovec, Michal ^{[1
]}

机构：

[1] Univ Geneva, Dept Inorgan Analyt & Appl Chem, CH-1211 Geneva 4, Switzerland

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2009年 / 113卷 / 25期

基金：

瑞士国家科学基金会;

关键词：

DOUBLE-LAYER FORCES; CHARGE INVERSION; LATEX-PARTICLES; SURFACE FORCES; AGGREGATION; NANOPARTICLES; MOLECULES;

D O I：

10.1021/jp904041k

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：

Polyelectrolytes adsorb strongly at oppositely charged surfaces, thereby dramatically influencing the corresponding interaction forces. In this letter, we report on direct force measurements with the atomic force microscope (AFM) between two individual particles in an aqueous colloidal suspension in the presence of polyelectrolytes near the isoelectric point. From systematic variations of the molecular mass, the ionic strength, and analysis of adhesion events, we conclude that the observed attractive forces are mainly due to electrostatic patch-charge interactions. The same type of attractive forces is equally influencing interactions between proteins as well as hydrophobic or mineral surfaces.

引用

页码：8458 / 8461

页数：4

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