Ion-Specific Influence of Electrolytes on Bubble Coalescence in Nonaqueous Solvents

We report the effects of electrolytes on bubble coalescence in nonaqueous solvents methanol, formamide, propylene carbonate, and dimethylsulfoxide (DMSO). Results in these solvents are compared to the ion-specific bubble coalescence inhibition observed in aqueous electrolyte solutions, which is pred...

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Bibliographic Details
Published in:Langmuir 2008-08, Vol.24 (15), p.7979-7985
Main Authors: Henry, Christine L, Craig, Vincent S. J
Format: Article
Language:English
Subjects:
Alkenes - chemistry
Carbonates - chemistry
Chemistry
Colloidal state and disperse state
Electrolytes
Exact sciences and technology
Gases - chemistry
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Ions - chemistry
Molecular Structure
Nanostructures - chemistry
Solvents - chemistry
Surface physical chemistry
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Summary:We report the effects of electrolytes on bubble coalescence in nonaqueous solvents methanol, formamide, propylene carbonate, and dimethylsulfoxide (DMSO). Results in these solvents are compared to the ion-specific bubble coalescence inhibition observed in aqueous electrolyte solutions, which is predicted by simple, empirical ion combining rules. Coalescence inhibition by electrolytes is observed in all solvents, at a lower concentration range (0.01 M to 0.1M) to that observed in water. Formamide shows ion-specific salt effects dependent upon ion combinations in a way analogous to the combining rules observed in water. Bubble coalescence in propylene carbonate is also consistent with ion-combining rules, but the ion assignments differ to those for water. In both methanol and DMSO all salts used are found to inhibit bubble coalescence. Our results show that electrolytes influence bubble coalescence in a rich and complex way, but with notable similarities across all solvents tested. Coalescence is influenced by the drainage of fluid between two bubbles to form a film and then the rupture of the film and one might expect that these processes will vary dramatically between solvents. The similarities in behavior we observe show that coalescence inhibition is unlikely to be related to the surface forces present but is perhaps related to the dynamic thinning and rupture of the liquid film through the hydrodynamic boundary condition.
ISSN:0743-7463
1520-5827
DOI:10.1021/la8008738