Charging and stability of anionic latex particles in the presence of linear poly(ethylene imine)

被引：33
|
作者：
Szilagyi, Istvan [1 ]
Rosicka, Dana [1 ]
Hierrezuelo, Jose [1 ]
Borkovec, Michal [1 ]
机构：
[1] Univ Geneva, Dept Inorgan Analyt & Appl Chem, CH-1211 Geneva 4, Switzerland
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2011年 / 360卷 / 02期
基金：
瑞士国家科学基金会;
关键词：
Polyethylenimine; Electrophoresis; Dynamic light scattering; Overcharging; Aggregation; Flocculation; Coagulation; COLLOIDAL PARTICLES; ADSORBED POLYELECTROLYTES; SURFACE-CHARGE; INTERPARTICLE FORCES; POLYSTYRENE LATEX; MOLECULAR-WEIGHT; OPPOSITE CHARGE; ADSORPTION; SILICA; FLOCCULATION;
D O I：
10.1016/j.jcis.2011.04.106
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：
Charging properties and colloidal stability of negatively charged polystyrene latex particles were investigated in the presence of linear poly(ethylene imine) (LPEI) of different molecular masses by electrophoresis and dynamic light scattering (DLS). Electrophoretic mobility measurements illustrate that LPEI strongly adsorbs on these particles leading to charge neutralization at isoelectric point (IEP) and charge reversal. Time-resolved DLS experiments indicate that the aggregation of the latex particles is rapid near the IEP and slows down away from this point. Surprisingly, the colloidal stability does not depend on the molecular mass, which indicates that the adsorbed LPEI layer is rather homogeneous. (C) 2011 Published by Elsevier Inc.
引用
收藏
页码：580 / 585
页数：6
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