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Organic ions as demulsifiers
YKI – Ytkemiska institutet.
1992 (English)In: Emulsions: A fundamental and practical approach / [ed] Sjöblom, J., Kluwer Academic Publishers, 1992, p. 259-268Chapter in book (Refereed)
Abstract [en]

The effects of tetraalkylammonium ions on the stability of dilute o/w emulsions were investigated with turbidimetric measurements. Large tetraalkyl-ammonium ions were found to induce flocculation of emulsions stabilized by ionic emulsifiers at concentrations 3 order of magnitudes lower compared to sodium ions. Emulsions stabilized by nonionic surfactant were also destabilized by low concentrations of organic ions. Inclusion complex formation of sodium ions with a crown ether, was found to drastically decrease the stability of the emulsion. All these observations demonstrate the importance of ion size and ion hydro--phobicity on the stability of emulsions in presence of electrolyte. NMR self-diffusion measurements in micellar systems, monitoring ion-emulsifier interactions, and studies of the phase behaviour of the emulsifier/organic ion systems have been performed in an attempt to rationalize these observations.

Place, publisher, year, edition, pages
Kluwer Academic Publishers, 1992. p. 259-268
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-13597OAI: oai:DiVA.org:ri-13597DiVA, id: diva2:988168
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2016-09-29Bibliographically approved

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