Volume 37, Number 4, February I 1997
|Page(s)||305 - 310|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Liquid coating from a surfactant solution
Laboratoire de Physique de la Matière Condensée,
Collège de France, 75231 Paris Cedex 05, France
2 Instituto Pluridisciplinar, Universidad Complutense, Paseo Juan XXIII n°1, 28040 Madrid, Spain
3 Physicochimie Curie, Institut Curie, 11 rue Pierre-et-Marie Curie, 75231 Paris Cedex 05, France
Accepted: 13 December 1996
A solid drawn out of a pure wetting liquid comes out coated with a layer of liquid, of thickness given by the Landau equation (for small coating velocities). If the solid is drawn from a solution containing surfactants, we show that the film is thicker than predicted by Landau: when drawing the solid, a gradient of surface concentration appears, provoking a Marangoni flow and thus a thickening of the film. The thickening factor we measure is found to reflect a balance between convection (responsible for the gradient) and absorption from the volume (which tends to erase the gradient).
PACS: 81.15.Lm – Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids) / 68.15.+3 – Liquid thin films / 82.70.-y – Disperse systems
© EDP Sciences, 1997
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