Surfactant Limited Aggregation of Hydrophobic Molecules in Water - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal de Physique II Année : 1997

Surfactant Limited Aggregation of Hydrophobic Molecules in Water

Hélène Lannibois
  • Fonction : Auteur
Anwar Hasmy
  • Fonction : Auteur
Robert Botet
  • Fonction : Auteur
Olivier Chariol
  • Fonction : Auteur
Bernard Cabane
  • Fonction : Auteur

Résumé

The precipitation in water of hydrophobic molecules has been studied in presence of addded surfactants. Amorphous particles grow trough 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 surfactant molecules 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 sizes by adding increasing amounts of surfactant become inefficient at some point where most of the added surfactant remains in water. These results are explained by a kinetic aggregation of hydrophobic molecules and adsorption of surfactant. The results of experiments are well reproduced by simulations where aggregation is allowed to proceed unimpeded for a time τ, 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.

Domaines

Articles anciens
Fichier principal
Vignette du fichier
ajp-jp2v7p319.pdf (1.51 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt

Dates et versions

jpa-00248446 , version 1 (04-02-2008)

Identifiants

Citer

Hélène Lannibois, Anwar Hasmy, Robert Botet, Olivier Chariol, Bernard Cabane. Surfactant Limited Aggregation of Hydrophobic Molecules in Water. Journal de Physique II, 1997, 7 (2), pp.319-342. ⟨10.1051/jp2:1997128⟩. ⟨jpa-00248446⟩

Collections

AJP
80 Consultations
166 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More