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Titolo:
THE STABILITY OF CHARGED COLLOIDS - ATTRACTIVE DOUBLE-LAYER FORCES DUE TO ASYMMETRIC CHARGE-DISTRIBUTION
Autore:
SJOSTROM L; AKESSON T;
Indirizzi:
CHEM CTR LUND,POB 124 S-22100 LUND SWEDEN
Titolo Testata:
Journal of colloid and interface science
fascicolo: 2, volume: 181, anno: 1996,
pagine: 645 - 653
SICI:
0021-9797(1996)181:2<645:TSOCC->2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY-ELECTROLYTE ADSORPTION; POISSON-BOLTZMANN EQUATION; WEAK POLYELECTROLYTES; IONIC-STRENGTH; SURFACES; CRYSTALS;
Keywords:
POLYELECTROLYTE; ASYMMETRIC SYSTEMS; ATTRACTIVE FORCES; ELECTRIC DOUBLE LAYER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
L. Sjostrom e T. Akesson, "THE STABILITY OF CHARGED COLLOIDS - ATTRACTIVE DOUBLE-LAYER FORCES DUE TO ASYMMETRIC CHARGE-DISTRIBUTION", Journal of colloid and interface science, 181(2), 1996, pp. 645-653

Abstract

The interaction between one charged surface with terminally grafted polyelectrolyte chains and one similarly charged surface neutralized bymobile counterions is investigated by Monte Carlo simulations. It is found that the force between the surfaces differs significantly from the forces obtained in symmetric systems. Due to entropic contributionsthe counterions penetrate into the half-cell containing polyelectrolyte, giving rise to an attractive force component of considerable strength between the subsystems. This force is affected by the chain structure of the polyelectrolyte and becomes more attractive with increasingflexibility. Asymptotic behavior, as well as salt dependence, of the surface force is estimated by mean field calculations on a related model system. Long-range attraction in asymmetric systems has recently been observed experimentally by surface force-distance measurements. (C)1996 Academic Press, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 16:29:07