Volume 61, Number 2, January 2003
|Page(s)||275 - 281|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 January 2003|
How do closed-compact multi-lamellar droplets form under shear flow? A possible mechanism
Centre de Physique Moléculaire Optique et Hertzienne, UMR 5798 Université Bordeaux I - 351 Cours de la Libération, 33400 Talence, France
2 Departament de Tecnologia de Tensioactius, CID/CSIC Jordi Girona 18-26, 08034 Barcelona, Spain
Corresponding author: email@example.com
Accepted: 28 October 2002
The formation of closed-compact multi-lamellar droplets obtained upon shearing both a lamellar phase and a two-phase–separated lamellar-sponge (-L3) mixture is investigated as a function of the shear rate , using small-angle light scattering (SALS) and cross-polarized optical microscopy. In both systems the formation of droplets occurs homogeneously in the cell at a well-defined wave vector via a strain-controlled process. These results suggest that the formation of droplets may be monitored in both systems by a buckling instability of the lamellae as predicted from a recent theory.
PACS: 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening) / 82.70.-y – Disperse systems; complex fluids / 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures
© EDP Sciences, 2003
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