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Titolo:
SALT EFFECTS ON THE INTERACTION BETWEEN ADSORBED CATIONIC POLYELECTROLYTE LAYERS - THEORY AND EXPERIMENT
Autore:
DAHLGREN MAG; WALTERMO A; BLOMBERG E; CLAESSON PM; SJOSTROM L; AKESSON T; JONSSON B;
Indirizzi:
ROYAL INST TECHNOL,DEPT CHEM,CHEM SURFACE SCI LAB S-10044 STOCKHOLM 70 SWEDEN INST SURFACE CHEM S-11486 STOCKHOLM SWEDEN
Titolo Testata:
Journal of physical chemistry
fascicolo: 45, volume: 97, anno: 1993,
pagine: 11769 - 11775
SICI:
0022-3654(1993)97:45<11769:SEOTIB>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY-ELECTROLYTE ADSORPTION; MICA SURFACES; CHARGED SURFACES; 2 SURFACES; WEAK POLYELECTROLYTES; POLYSTYRENE SULFONATE; IONIC-STRENGTH; L-LYSINE; FORCES; CRYSTALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M.A.G. Dahlgren et al., "SALT EFFECTS ON THE INTERACTION BETWEEN ADSORBED CATIONIC POLYELECTROLYTE LAYERS - THEORY AND EXPERIMENT", Journal of physical chemistry, 97(45), 1993, pp. 11769-11775

Abstract

The effect of inert salt concentration on polyelectrolyte adsorption from aqueous solutions onto oppositely charged surfaces and the interactions between such surfaces were studied experimentally using a surface force technique and compared to theoretical predictions from Monte Carlo simulations. At a polyelectrolyte concentration of 10 ppm and a low inert salt concentration (10(-4) M), the polyelectrolytes adsorb in a flat conformation and the force acting between the surfaces is close to zero down to a separation of 10(-15) nm, where the surfaces jumpinward. The attractive force observed at separations below 10 nm is stronger than the expected van der Waals force. The magnitude and rangeof the attraction agree with forces obtained from Monte Carlo simulation, and we interpret the attraction as being due to bridging polyelectrolytes. When the salt concentration is increased, additional polyelectrolyte adsorption takes place. This again gives rise to a repulsive force, which is significantly larger than what is observed between bare surfaces. The extra repulsion is due to adsorbed polyelectrolytes stretching out from the surfaces and is also predicted from simulations.

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Documento generato il 02/12/20 alle ore 17:51:15