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Titolo: ATTRACTIVE OSMOTICPRESSURE IN AN ELECTRIC DOUBLELAYER WITH GRAFTED POLYELECTROLYTES
Autore: ENNIS J; SJOSTROM L; AKESSON T; JONSSON B;
 Indirizzi:
 LUND UNIV,CTR CHEM,POB 124 S22100 LUND SWEDEN
 Titolo Testata:
 JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 12,
volume: 102,
anno: 1998,
pagine: 2149  2164
 SICI:
 10895647(1998)102:12<2149:AOIAED>2.0.ZU;29
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 MONTECARLO SIMULATIONS; POLYLLYSINE; WEAKLY CHARGED POLYELECTROLYTES; SYMMETRICAL ELECTROLYTES; ADSORPTION BEHAVIOR; POISSONBOLTZMANN; PRIMITIVE MODEL; LATTICE THEORY; FREEENERGY; SURFACES;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 50
 Recensione:
 Indirizzi per estratti:



 Citazione:
 J. Ennis et al., "ATTRACTIVE OSMOTICPRESSURE IN AN ELECTRIC DOUBLELAYER WITH GRAFTED POLYELECTROLYTES", JOURNAL OF PHYSICAL CHEMISTRY B, 102(12), 1998, pp. 21492164
Abstract
The doublelayer interaction between one wall neutralized by both grafted polyelectrolytes and mobile counterions and another wall neutralized only by mobile counterions can give rise to an attractive osmotic pressure. This has been previously observed in both experiments and Monte Carlo simulations. Here a simplified model of this system is studied, in which the polyelectrolyte is replaced by ''grafted'' ions whichinteract with the grafting wall via a onedimensional potential. In amean field approximation, the model can be solved numerically, and certain cases are analytically tractable. The accuracy of the mean fieldapproximation is tested by Monte Carlo simulations. Regardless of theexact form of the grafting potential, the simplified model proves to have the same qualitative features as simulations of the more complicated system where the configurations of the polyelectrolyte chains are explicitly included. In particular, in the absence of salt the interaction is repulsive at longrange but can be strongly attractive at mediumrange, depending on the proportion of grafted ions and the width ofthe grafting potential. The interaction is again repulsive at shortrange. The most interesting result is that addition of sufficient salt always causes the interaction to become attractive at longrange, primarily due to the change in the ideal contribution to the pressure.
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Documento generato il 30/11/20 alle ore 12:22:33