OSMOTIC EQUILIBRIUM AND DEPLETION INDUCED BY POLYELECTROLYTES IN CLAY DISPERSIONS

被引：16

作者：

MORVAN, M

ESPINAT, D

VASCON, R

LAMBARD, J

ZEMB, T

机构：

[1] INST FRANCAIS PETR,DIV RECH PHYSICOCHIM APPL & ANAL,F-92506 RUEIL MALMAISON,FRANCE

[2] CENS,CEA,SERV CHIM MOLEC,F-91191 GIF SUR YVETTE,FRANCE

来源：

LANGMUIR | 1994年 / 10卷 / 08期

关键词：

D O I：

10.1021/la00020a013

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pseudoternary systems of negatively charged clay (montmorillonite), anionic polyelectrolyte (sodium polyacrylate), counterions, and water exhibit a local segregation of two distinct phases on a colloidal scale. The microscopic osmotic equilibrium condition in the diphasic dispersion sets the spacing observed between the sodium montmorillonite platelets: the effect of polyelectrolyte is equivalence to an external depletion force equilibrating electrostatic repulsion. In the case of calcium montmorillonite clay, the osmotic stress effect is only observed when sufficient polyelectrolyte is added to saturate the ion condensation of all calcium clay counterions on the polyelectrolyte chain.

引用

页码：2566 / 2569

页数：4

共 28 条

[1]

[Anonymous], 1979, FORMATION PROPERTIES

[2]

Brindley G.W., 1980, CRYSTAL STRUCTURES C

[3] SMALL-ANGLE X-RAY-SCATTERING ANALYSIS OF CATALYSTS - COMPARISON AND EVALUATION OF MODELS [J].