Affordable Access

Access to the full text

Rheological analysis of highly concentrated w/o emulsions

Authors
  • Jager-Lézer, Nathalie1
  • Tranchant, Jean-Francois2
  • Alard, Valérie2
  • Vu, Can3
  • Tchoreloff, Pierre Cyrill1
  • Grossiord, J.-L.1
  • 1 Laboratoire de Physique Pharmaceutique Centre de Châtenay-Malabry Université Paris XI 5. rue Jean-Baptiste Clément 92296 Châtenay-Malabry France E-mail: [email protected], FR
  • 2 Laboratoire de Physico-Chimie Partums Christian DIOR Saint Jean de Braye France, FR
  • 3 Laboratoire d‘analyses Société Francaise HOECHST Centre de Recherches et d‘Applications Stains France, FR
Type
Published Article
Journal
Rheologica Acta
Publisher
Springer-Verlag
Publication Date
Apr 01, 1998
Volume
37
Issue
2
Pages
129–138
Identifiers
DOI: 10.1007/s003970050099
Source
Springer Nature
Keywords
License
Yellow

Abstract

A series of highly concentrated lipophilic cosmetic emulsions were analysed, in order to determine their rheological and textural properties, as a function of their microstructure. The originality of this study lies in the methodology used, especially the shear-stress scanning analysis. The results of a very powerful and comprehensive dynamic rheological analysis suggest the existence of two critical volume fraction values: besides the “close-packed” value φc, a “slack-packed” value φ0, close to 0.60 could be demonstrated. It has been shown that the close-packed structure is stable under shear; in constrast, the slack-packed configuration, defined as φ0<φ<φc is unstable under shear. A comparison with theoretical models, especially that of Princen, showed good agreement and allowed the close-packed value φc to be defined more precisely as 0.67. The gap between 0.67 and 0.74 is probably indicative of a highly polydisperse distribution, as confirmed by microscopic analysis. Flow experiments confirmed the validity of Princen‘s model.

Report this publication

Statistics

Seen <100 times