Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
SURFACTANT LIMITED AGGREGATION OF HYDROPHOBIC MOLECULES IN WATER
Autore:
LANNIBOIS H; HASMY A; BOTET R; CHARIOL OA; CABANE B;
Indirizzi:
UNIV PARIS 11,PHYS SOLIDES LAB,BATIMENT 510 F-91405 ORSAY FRANCE UNIV PARIS 11,PHYS SOLIDES LAB F-91405 ORSAY FRANCE RHONE POULENC RECH,EQUIPE MIXTE CEA RP F-93308 AUBERVILLIERS FRANCE
Titolo Testata:
Journal de physique. II
fascicolo: 2, volume: 7, anno: 1997,
pagine: 319 - 342
SICI:
1155-4312(1997)7:2<319:SLAOHM>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
NANOPARTICLES; SYSTEM; GROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
H. Lannibois et al., "SURFACTANT LIMITED AGGREGATION OF HYDROPHOBIC MOLECULES IN WATER", Journal de physique. II, 7(2), 1997, pp. 319-342

Abstract

The precipitation in water of hydrophobic molecules has been studied in presence of added surfactants. Amorphous particles grow through aggregation of clusters of hydrophobic molecules; the growth is terminated by adsorption of surfactant. The particle sizes vary according to the concentrations of hydrophobic molecules and of surfactant molecules. Two regimes have been found for the use of surfactant molecules: at low surfactant concentrations, an efficient regime where all surfactantmolecules are adsorbed on the surfaces of the growing particles; at high surfactant concentrations, a wasteful regime, where excess surfactant molecules are left in water. Attempts to reduce the particle sizesby adding increasing amounts of surfactant become inefficient at somepoint where most of the added surfactant remains in water. These results are explained by a kinetic aggregation model which simulates the competition between aggregation of hydrophobic molecules and adsorptionof surfactant. The results of experiments are well reproduced by simulations where aggregation is allowed to proceed unimpeded for a time tau, and then adsorption of the surfactant starts. In these conditions,particle sizes are determined by the rate of aggregation and by the value of this time delay.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 22:39:52