Effects of Added Urea and Alkylureas on Gel to Liquid-Crystal Transitions in Doab Vesicles |
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| Authors: | Blandamer M J Briggs B Cullis P M Last P Engberts J B F N Kacperska A |
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| Institution: | (1) Department of Chemistry, University of Leicester, Leicester, LE1 7RH, England;(2) Department of Organic & Molecular Inorganic Chemistry, University of Groningen Nijenborgh 4, 9747 AG Groningen, The Netherlands;(3) Department of Physical Chemistry, University of Łódż, Pomorska 18, 91-416 Łódż, Poland |
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| Abstract: | The gel to liquid-crystal transition for vesicles in aqueous solution formed by dimethyldi-n-octadecylammonium bromide (DOAB)
occurs at 44.7°C. Moreover, the shapes of the scans recorded by a sensitive DSC microcalorimeter are very similar when the
vesicular solutions are prepared starting with solid DOAB and comparable amounts of either solid urea or solid alkylureas.
Therefore, the DOAB vesicles in aqueous solution accommodate this class of solutes without marked changes in the melting temperature
and the enthalpy of the transition. The contrast with effects of added surfactants and simple organic solutes such as THF
and ethanol is particularly significant.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | alkylureas DOAB vesicles DSC gel-liquid transitions urea |
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