Protonation of carboxyl latex particles in the presence of a strong cationic polyelectrolyte

被引：9

作者：

Cakara, Dusko ^{[1
]}

Chassagne, Claire ^{[1
]}

Gehin-Delval, Cecile ^{[1
]}

Borkovec, Michal ^{[1
]}

机构：

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

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2007年 / 294卷 / 1-3期

关键词：

latex; polyelectrolyte; potentiometric titration; electrophoresis; adsoprtion; poly(diallyl dimethyl ammonium chloride); DADMAC;

D O I：

10.1016/j.colsurfa.2006.08.006

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 [物理化学]; 081704 [应用化学];

摘要：

The charging behavior of carboxyl latex surface in the presence of poly(diallyl dimethyl ammonium chloride) (DADMAC) was investigated by means of potentiometric titrations and electrophoretic mobility. The titration curves at different ionic strengths show a common crossing point, which coincides with the point of zero mobility, and can be identified with the point of zero charge (PZC). This characteristic behavior is due to the adsorption of the strong cationic polyelectrolyte on the weak acid particle surface, leading to an additional positive charge, and a corresponding shift of the surface potential. These features can be quantified in terms of modified Stem model and the standard electrokinetic model. This model predicts the PZC very well, while the magnitude of the charge and its ionic strength dependence are reproduced only semi-quantitatively. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：174 / 180

页数：7

共 21 条

[1]

Flocculation of latex particles of varying surface charge densities by chitosans [J].