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Stability of aqueous films between bubbles. Part 2. Effects of trace impurities and evaporation

Yaminsky, Vassili V., Ohnishi, Satomi, Vogler, Erwin A. and Horn, Roger G. 2010, Stability of aqueous films between bubbles. Part 2. Effects of trace impurities and evaporation, Langmuir, vol. 26, no. 11, pp. 8075-8080.

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Title Stability of aqueous films between bubbles. Part 2. Effects of trace impurities and evaporation
Author(s) Yaminsky, Vassili V.
Ohnishi, Satomi
Vogler, Erwin A.
Horn, Roger G.
Journal name Langmuir
Volume number 26
Issue number 11
Start page 8075
End page 8080
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2010
ISSN 0743-7463
1520-5827
Summary The stability of water films has been investigated with a Mysels-Scheludko type film balance. Minor trace impurities in water do not affect the lifetime of water films under vapor saturation, but significantly influence the stability in free evaporation. Trace amounts of positively adsorbed contaminants induce Marangoni-driven flow that destabilizes films under evaporation conditions whereas negatively adsorbed electrolytes actually prolong stability by reversing interfacial tension gradients and driving a steady circulation within the film. At high thinning rates, pure-water films develop exotic-appearing flow patterns and break due to a strong coupling between hydrodynamic and interfacial tensiongradient adsorption stresses. The most dominant factor of transient film stabilization in dynamic conditions under evaporation is a surface tension gradient created in the film. We discuss surface tension gradients in transient films created by temperature differences, impurity concentration, and expansion of the films.
Notes First published online 10th February 2010
Language eng
Field of Research 030603 Colloid and Surface Chemistry
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041493

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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