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Titolo:
CHARGE REVERSAL IN ELECTRICAL DOUBLE-LAYERS - A BALANCE BETWEEN ENERGY AND ENTROPY
Autore:
SJOSTROM L; AKESSON T; JONSSON B;
Indirizzi:
LUND UNIV,CTR CHEM,POB 124 S-22100 LUND SWEDEN
Titolo Testata:
Berichte der Bunsengesellschaft fur Physikalische Chemie
fascicolo: 6, volume: 100, anno: 1996,
pagine: 889 - 893
SICI:
0005-9021(1996)100:6<889:CRIED->2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUEOUS-ELECTROLYTE SOLUTIONS; MICA SURFACES; FORCES; SIMULATION;
Keywords:
COLLOIDS; INTERFACES; MOLECULAR INTERACTIONS; POLYMERS; STATISTICAL MECHANICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
L. Sjostrom et al., "CHARGE REVERSAL IN ELECTRICAL DOUBLE-LAYERS - A BALANCE BETWEEN ENERGY AND ENTROPY", Berichte der Bunsengesellschaft fur Physikalische Chemie, 100(6), 1996, pp. 889-893

Abstract

Monte Carlo simulations and accurate analytical theories predict a charge reversal in an electric double layer under some specific conditions. One typical situation is for very highly charged aggregates in thepresence of divalent counterions, where ionic correlations become important. Here, we reexamine the phenomenon in terms of a balance between energy and entropy contributions. High surface charge density, low temperature, low dielectric permittivity or multivalent counterions, all these factors increase the influence of the energetic term and favour a charge reversal. Previous studies have focused on the energy term and attempts to increase that. An alternative and equally valid way isto reduce the entropy term, which can be accomplished by replacing single atomic or molecular counterions by polyelectrolyte chains. The entropy of the charged chains is of course much lower than that of the small ions and the dominance of the energy term will again lead to a charge reversal, but in this case at a much lower and more realistic value of the electrostatic coupling.

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Documento generato il 25/11/20 alle ore 10:11:14