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Titolo:
Adsorption of polyampholytes to charged surfaces
Autore:
Khan, MO; Akesson, T; Jonsson, B;
Indirizzi:
Univ Lund, Ctr Chem, SE-22100 Lund, Sweden Univ Lund Lund Sweden SE-22100 niv Lund, Ctr Chem, SE-22100 Lund, Sweden
Titolo Testata:
MACROMOLECULES
fascicolo: 12, volume: 34, anno: 2001,
pagine: 4216 - 4221
SICI:
0024-9297(20010605)34:12<4216:AOPTCS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-DYNAMICS; CHAIN; INSTABILITIES; STABILITY; SALT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Khan, MO Univ Lund, Ctr Chem, POB 124, SE-22100 Lund, Sweden Univ Lund POB124 Lund Sweden SE-22100 24, SE-22100 Lund, Sweden
Citazione:
M.O. Khan et al., "Adsorption of polyampholytes to charged surfaces", MACROMOLEC, 34(12), 2001, pp. 4216-4221

Abstract

The adsorption of flexible polyampholytes to charged surfaces has been investigated. The electrostatic interactions are included in a mean-field manner, while the chain connectivity is treated by Metropolis Monte Carlo (MC) simulations. For large enough surface charge densities, adsorption is foundboth for neutral polyampholytes and for polyampholytes carrying the same net charge as the surfaces. The simulation results are used to check the reliability of previously proposed analytical theories. The exponents predicted in those scaling relations are not reproduced by MC simulations. The simulations show that the size of the adsorbed polyampholyte initially grows with increasing surface charge density, but for sufficiently charged surfacesit reaches a maximum and starts to decrease. This general behavior is qualitatively captured by scaling arguments. The MC simulations do not bear anyevidence for the existence of three disparate regimes where the polyampholyte adsorbs in different conformations.

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Documento generato il 25/11/20 alle ore 08:58:54