Issue 7, 2017

Water film squeezed between oil and solid: drainage towards stabilization by disjoining pressure

Abstract

The spontaneous drainage of aqueous solutions of salt squeezed between an oil drop and a glass surface is studied experimentally. The thickness profile of the film is measured in space and time by reflection interference microscopy. As the film thins down, three regimes are identified: a capillary dominated regime, a mixed capillary and disjoining pressure regime, and a disjoining pressure dominated regime. These regimes are modeled within the lubrication approximation, and the role of the disjoining pressure is precisely investigated in the limit of thicknesses smaller than the range of electrostatic interactions. We derive simple analytical laws describing the drainage dynamics, thus providing tools to uncouple the effect of the film geometry from the effects of the disjoining or capillary pressures.

Graphical abstract: Water film squeezed between oil and solid: drainage towards stabilization by disjoining pressure

Article information

Article type
Paper
Submitted
26 Okt. 2016
Accepted
16 Janv. 2017
First published
17 Janv. 2017

Soft Matter, 2017,13, 1384-1395

Water film squeezed between oil and solid: drainage towards stabilization by disjoining pressure

L. Bluteau, M. Bourrel, N. Passade-Boupat, L. Talini, E. Verneuil and F. Lequeux, Soft Matter, 2017, 13, 1384 DOI: 10.1039/C6SM02423H

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