Drainage and rupture of thin foam films in the presence of ionic and non-ionic surfactants

Wang, Liguang (2012) Drainage and rupture of thin foam films in the presence of ionic and non-ionic surfactants. International Journal of Mineral Processing, 102-103 58-68. doi:10.1016/j.minpro.2011.09.012


Author Wang, Liguang
Title Drainage and rupture of thin foam films in the presence of ionic and non-ionic surfactants
Journal name International Journal of Mineral Processing   Check publisher's open access policy
ISSN 0301-7516
Publication date 2012-01-25
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.minpro.2011.09.012
Volume 102-103
Start page 58
End page 68
Total pages 11
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Formatted abstract
The thin film pressure balance technique was used to determine the overall magnitude of the surface forces in foam films stabilized by flotation reagents such as sodium dodecyl sulfate and polypropylene glycol at high NaCl concentrations. The Stefan–Reynolds lubrication approximation was used to estimate the forces from measured film thinning rates while the capillary wave model of Valkovska, Danov and Ivanov was used to calculate the forces from measured critical rupture thicknesses. It was found that at very low surfactant concentrations commensurate with typical flotation reagent dosage, the overall forces were attractive and up to one order of magnitude stronger than the Lifshitz–van der Waals forces. The forces became smaller with increasing surfactant concentration. It was also found that the forces obtained from the capillary wave theory were indifferent to changes in film radii and surface mobility, in contrast to the Reynolds lubrication approximation. For comparison, other film drainage models considering film surface mobility and hydrodynamic corrugation were used to fit the present experimental thinning curves obtained at very low surfactant concentrations. They also showed that the overall attraction forces were several times stronger than the Lifshitz–van der Waals forces.

Highlights: ► We examine both thin film drainage and rupture in flotation froth. ► We detect inter-bubble attractions stronger than Lifshitz–van der Waals force. ► Increasing surfactant concentration will reduce the inter-bubble attractions.
Keyword Bubble coalescence
Surface forces
Film thinning
Film rupture
Surface mobility
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 1 October 2011.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2012 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 25 Jan 2012, 13:08:13 EST by Dr Liguang Wang on behalf of School of Chemical Engineering