Polyelectrolyte adsorption on charged surfaces: study by electrokinetic measurements

被引：58
|
作者：
Schwarz, S [1 ]
Buchhammer, HM [1 ]
Lunkwitz, K [1 ]
Jacobasch, HJ [1 ]
机构：
[1] Polymer Res Inst, D-07069 Dresden, Germany
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1998年 / 140卷 / 1-3期
关键词：
flocculation; polyelectrolyte adsorption; zeta potential;
D O I：
10.1016/S0927-7757(97)00294-X
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：
In order to describe the influence of cationic polyelectrolytes on flocculation of disperse systems the adsorption of poly (diallyldimethylammonium chloride) (PDADMAC) onto silica, mica and acidic polymer latex was investigated. The plateau value of the adsorption isotherms grows with increasing surface charge density of the substrates and electrolyte concentration. The adsorbed layer of the polycation was. characterized by zeta potential measurements with KCl solutions of constant ionic strength and varied pH. The zero point of the charge as well as the shape of the zeta potential-pH plot depends on the coverage of the surface with polycations. For fully covered substrates the zero point of the charge as well as the pK(A) and pK(B) values calculated by a stochastic search programme are independent of the substrate. Maximum flocculation was observed at about 30% of the plateau value of the adsorption isotherms. (C) 1998 Elsevier Science B.V. All rights reserved.
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收藏
页码：377 / 384
页数：8
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