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Issue 12, 2013
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Lamellar to hexagonal columnar liquid crystalline phase transition in a catanionic surfactant mixture: dodecylammonium chloride–sodium bis(2-ethylhexyl) sulfosuccinate

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Abstract

Phase transitions from a dispersed lamellar to hexagonal liquid crystalline phase have been investigated in a catanionic surfactant mixture formed by mixing a single tailed cationic surfactant, dodecylammonium chloride, with a double tailed anionic surfactant, sodium bis(2-ethylhexyl) sulfosuccinate. Depending on the bulk composition and total surfactant concentration, mixed micelles, vesicles, lamellar and hexagonal columnar liquid crystalline phases have been identified. Differences in the geometry of the two hydrophobic chains stabilize vesicles of different shapes (spherical, tubular and pearled) relative to the liquid crystalline phase even in stoichiometric mixtures. At higher surfactant concentrations the phase transition from a dispersed lamellar to hexagonal columnar liquid crystalline phase proceeds continuously, with both phases coexisting over a range of concentrations. The transition proceeds through processes of vesicle aggregation, reorganization into multilayer sheets rolled-up into tubules, and formation of a hexagonal columnar liquid crystalline phase.

Graphical abstract: Lamellar to hexagonal columnar liquid crystalline phase transition in a catanionic surfactant mixture: dodecylammonium chloride–sodium bis(2-ethylhexyl) sulfosuccinate

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Article information


Submitted
19 Nov 2012
Accepted
16 Jan 2013
First published
11 Feb 2013

Soft Matter, 2013,9, 3349-3360
Article type
Paper

Lamellar to hexagonal columnar liquid crystalline phase transition in a catanionic surfactant mixture: dodecylammonium chloride–sodium bis(2-ethylhexyl) sulfosuccinate

D. Jurašin, M. Vinceković, A. Pustak, I. Šmit, M. Bujan and N. Filipović-Vinceković, Soft Matter, 2013, 9, 3349
DOI: 10.1039/C3SM27665A

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