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Phase diagrams for cationic surfactants in polar solvent systems
YKI – Ytkemiska institutet.
1990 (English)In: Progress in Colloid and Polymer Science, ISSN 0340-255X, E-ISSN 1437-8027, Vol. 82, 271-279 p.Article in journal (Refereed)
Abstract [en]

Phase diagrams are presented for cationic surfactants, and alkyltrimethyl ammonium bromide in polar solvent systems, such as ethylene glycol, formamide, glycerol, and their mixtures with water. Provided that the solvent is sufficiently lipophobic, and that the hydrocarbon moiety of the surfactant is sufficiently large, liquid crystalline phases form according to the normal association pattern for ionic surfactants. In, for example, ethylene glycol, liquid crystals are only formed with surfactants with a longer alkyl chain length than dodecyl.-The formation of didodecyldimethylammonium bromide microemulsions containing polar solvents- mainly formamide, water and their mixtures-and hydrocarbon has been studied. The extension of the solution phase region may decrease, although the mutual miscibility of polar solvent and the hydrocarbon increases. NMR self-diffusion measurements reveal that this is accompanied by a corresponding loss of structure, i.e., a smaller distinction between polar and apolar regions.

Place, publisher, year, edition, pages
1990. Vol. 82, 271-279 p.
Keyword [en]
Phase equilibria, polar solvents, alkyltrimethylammonium bromide, didodecyldimethylammonium bromide, non-aqueous microemulsions
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27422OAI: oai:DiVA.org:ri-27422DiVA: diva2:1054426
Note
A625Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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