Thermal transitions of DODAB vesicular dispersions |
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Authors: | Jan Cocquyt Ulf Olsson Gerd Olofsson Paul Van der Meeren |
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Institution: | (1) Particle and Interfacial Technology Group, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;(2) Physical Chemistry 1, Center of Chemistry and Chemical Engineering, Lund University, Box 124, 221 00 Lund, Sweden |
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Abstract: | Two endothermic transitions, at 36°C and 44°C, were observed with differential scanning calorimetry (DSC) upon heating dioctadecyldimethylammonium
bromide vesicle dispersions that were equilibrated below 15°C while in samples kept at 25°C there was only the transition
at 44°C, which was shown to be the gel to liquid–crystalline transition by 1H-NMR measurements. The transition at 36°C was reversed in an exothermic transition around 13°C upon cooling. The slowness
of this transition at ambient temperatures suggests that the presence of the transition at 36°C in a DSC upscan depends strongly
on the sample history. |
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Keywords: | Bilayer DODAB DSC Melting |
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