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Bubble-solid interactions in water and electrolyte solutions

Pushkarova, Rada A. and Horn, Roger G. 2008, Bubble-solid interactions in water and electrolyte solutions, Langmuir, vol. 24, no. 16, pp. 8726-8734, doi: 10.1021/la8007156.

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Title Bubble-solid interactions in water and electrolyte solutions
Author(s) Pushkarova, Rada A.
Horn, Roger G.
Journal name Langmuir
Volume number 24
Issue number 16
Start page 8726
End page 8734
Total pages 9
Publisher American Chemical Society
Place of publication Washington, D. C.
Publication date 2008
ISSN 0743-7463
1520-5827
Summary Surface forces between an air bubble and a flat mica surface immersed in aqueous electrolyte solutions have been investigated using a modified surface force apparatus. An analysis of the deformation of the air bubble with respect to the mutual position of the bubble and the mica surface, the capillary pressure, and the disjoining pressure allows the air-liquid surface electrical potential to be determined. The experiments show that a long-range, double-layer repulsion acts between the mica (which is negatively charged) and an air bubble in water and in various electrolyte solutions at low concentration, thereby indicating that the air bubble surface is negatively charged. However, there is clear evidence that charge regulation occurs at the air-water interface to maintain a constant surface potential, and as a result of this, the charge at this interface changes from negative to positive as the bubble approaches the mica surface. Because of the attraction that arises as a result of the charge reversal, a finite force is required to separate the bubble from the mica, though the mica remains wetted by the aqueous phase. At the low concentrations investigated, the potential on the gas-liquid interface is independent of the electrolyte type within experimental uncertainty.
Notes First published online 26th July, 2008
Language eng
DOI 10.1021/la8007156
Field of Research 030603 Colloid and Surface Chemistry
020405 Soft Condensed Matter
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2008, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041485

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