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The influence of surface forces on thin film drainage between a fluid drop and a flat solid

Connor, Jason N. and Horn, Roger G. 2003, The influence of surface forces on thin film drainage between a fluid drop and a flat solid, Faraday discussions, vol. 123, pp. 193-206, doi: 10.1039/B204500C.

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Title The influence of surface forces on thin film drainage between a fluid drop and a flat solid
Author(s) Connor, Jason N.
Horn, Roger G.
Journal name Faraday discussions
Volume number 123
Start page 193
End page 206
Total pages 14
Publisher Royal Society of Chemistry
Place of publication London, England
Publication date 2003
ISSN 1359-6640
1364-5498
Keyword(s) surface forces
thin film drainage
fluid drop
Summary An experiment is described in which a mica surface is driven towards a mercury drop immersed in aqueous electrolyte. Under appropriate conditions, hydrodynamic pressure in the aqueous film creates a classical dimple in the mercury drop. The use of optical interferometry and video recording to monitor the shape of the drop and the thickness of the aqueous film with sub-nanometre resolution yields a high density of precise data showing the formation and evolution of the dimple as the film drains. Variation of electrical potential applied to the mercury phase allows control of the surface forces acting between the drop and the mica surface, so that the effect of surface forces on the film drainage process is highlighted. It is found that the film thickness at the centre of the dimple and the lateral extent of the dimple are not significantly affected by surface forces. On the other hand, the minimum film thickness at the edge of the dimple is sensitive even to weak surface forces. Since this minimum film thickness is a major determinant of the film drainage rate, it is shown that surface forces have an important effect on the overall drainage process.
Language eng
DOI 10.1039/B204500C
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, The Royal Society of Chemistry
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041441

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