Cation-induced collapse of low-molecular-weight polyacrylic acid in the dispersion of barium titanate

被引:19
作者
Bell, NS [1 ]
Sindel, J
Aldinger, F
Sigmund, WM
机构
[1] Univ Stuttgart, Max Planck Inst Met Forsch, Inst Nichtmet Anorgan Mat, Pulvar Met Lab, D-70569 Stuttgart, Germany
[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32606 USA
关键词
polyacrylic acid; dispersant; divalent ion; barium titanate; interparticle force;
D O I
10.1006/jcis.2002.8557
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
Observations on the steric layers formed by the adsorption of low-molecular-weight polyacrylic acid (PAA) were taken using the colloidal probe method in an atomic force microscope. The effects of divalent barium ions and of monovalent potassium ions at varying concentrations were observed on the repulsive interaction profiles. High ionic concentrations screened double-layer forces to small distances, whereby the acting forces were reduced to steric interactions. De Gennes scaling theory was used to model the effect of electrolyte on an aqueous barium titanate system, which was stabilized with PAA. The brush model was found to represent the force curves better than the mushroom model. The collapse of PAA layers with increasing salt approximated a grafted polymer brush in monovalent electrolyte, but the addition of barium ions caused markedly less steric collapse. It is suggested that the formation of a Ba2+-PAA complex in the adsorbed layer increases its compressibility parameter. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:296 / 305
页数:10
相关论文
共 70 条
[51]   THEORY OF THE GRAFTED POLYMER BRUSH [J].
MILNER, ST ;
WITTEN, TA ;
CATES, ME .
MACROMOLECULES, 1988, 21 (08) :2610-2619
[52]   A POLY-ELECTROLYTE BRUSH THEORY [J].
MISRA, S ;
VARANASI, S ;
VARANASI, PP .
MACROMOLECULES, 1989, 22 (11) :4173-4179
[53]  
NAPPER DH, 1986, POLYM STABILIZATION
[54]  
PEDERSEN HG, 1998, THESIS TU DENMARK
[55]   Polyelectrolyte complexation at oxide-water interfaces influence on colloidal stability [J].
Pefferkorn, E ;
Ringenbach, E ;
Chauveteau, G .
REVUE DE L INSTITUT FRANCAIS DU PETROLE, 1997, 52 (02) :222-225
[56]   COLLOID STABILIZATION WITH GRAFTED POLYELECTROLYTES [J].
PINCUS, P .
MACROMOLECULES, 1991, 24 (10) :2912-2919
[57]   Counterions contributions in polyelectrolyte adsorption [J].
Pochard, I ;
Couchot, P ;
Geffroy, C ;
Foissy, A ;
Persello, J .
REVUE DE L INSTITUT FRANCAIS DU PETROLE, 1997, 52 (02) :251-253
[58]   ADSORPTION OF POLYELECTROLYTES ON SOLUBLE OXIDES INDUCED BY POLYION COMPLEXATION WITH DISSOLUTION SPECIES [J].
RINGENBACH, E ;
CHAUVETEAU, G ;
PEFFERKORN, E .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1993, 161 (01) :223-231
[59]   THE POLYELECTROLYTE BRUSH - POOR SOLVENT [J].
ROSS, RS ;
PINCUS, P .
MACROMOLECULES, 1992, 25 (08) :2177-2183
[60]   Counterion-condensation-induced collapse of highly charged polyelectrolytes [J].
Schiessel, H ;
Pincus, P .
MACROMOLECULES, 1998, 31 (22) :7953-7959