Europhys. Lett.
Volume 67, Number 4, August 2004
Page(s) 662 - 668
Section Interdisciplinary physics and related areas of science and technology
Published online 01 August 2004
Europhys. Lett., 67 (4), pp. 662-668 (2004)
DOI: 10.1209/epl/i2004-10100-3

Measurement of the coalescence frequency in surfactant-stabilized concentrated emulsions

V. Schmitt1 and F. Leal-Calderon2

1  Centre de Recherche Paul Pascal Av. Schweitzer, 33600 Pessac, France
2  Laboratoire des Milieux Dispersés Alimentaires, ISTAB Av. des facultés, 33405 Talence, France

(Received 12 March 2004; accepted in final form 4 June 2004)

We produce different oil-in-water concentrated emulsions stabilized by surfactants and we follow their kinetic evolution. We get evidence that the size evolution is first determined by Ostwald ripening and then by coalescence. The crossover between the two regimes occurs at a well-defined droplet diameter that characterizes the surfactant monolayer. We exploit this general type of evolution to measure the characteristic coalescence frequency in the thin liquid films.

82.70.Dd - Colloids.
82.70.Kj - Emulsions and suspensions.
68.15.+e - Liquid thin films.

© EDP Sciences 2004