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The influence of tetraalkylammonium counterions on the drainage and stability of thin films and foams stabilized by dilute aqueous solutions of sodium dodecyl sulphate
YKI – Ytkemiska institutet.
1997 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 186, 493-497 p.Article in journal (Refereed)
Abstract [en]

It was demonstrated that the presence of tetraalkylammonium counterions in aqueous foams and thin film lamella stabilized by sodium dodecyl sulphate (at concentrations below the cmc) can either act to promote or prevent foam stability. The increase in stability is caused by the congenial incorporation of the smaller and more hydrophilic counterions such as tetraethyl ammonium cations and to some extent tetrabutyl ammonium cations into the interfacial anionic layers. This causes regular thin film drainage rates and promotes black films and stable foams. The structure changes increase the interfacial cohesive interaction and resiliency within the thin film lamella. The decrease in stability is associated with rapid drainage rates and is caused by the penetration of larger more hydrophobic tetrapentylammonium cations in the layers. This disrupts and weakens the molecular interactions (less cohesion). This result is quite different from previously reported studies (1) describing with the action of tetraalkylammonium counterions on sodium dodecyl sulphate (at concentrations above the cmc). At these higher surfactant concentrations, a defoaming action was generally observed and could be explained in terms of a reduction in the dynamic stability (Gibbs surface elasticity).

Place, publisher, year, edition, pages
1997. Vol. 186, 493-497 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26733OAI: oai:DiVA.org:ri-26733DiVA: diva2:1053736
Note
A1061Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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