Abstract
Dioctadecyl-dimethyl-ammonium bromide (DODAB) vesicles can be characterized by their differential scanning calorimetry (DSC) thermograms comprised of two endotherms at T s ≈ 36 °C and T m ≈ 45 °C in the heating, ascribed respectively to the subgel-to-gel and gel-to-liquid crystalline transitions, and two exotherms at T′m ≈ 40 °C and T′s ≈ 16 °C in the cooling, ascribed respectively to the liquid crystalline-to-gel and gel-to-subgel transitions. It has been reported but not proved that the T m-transitions, the T′m-transitions, the T s-transitions, and the T′s-transitions are reverse to each other, displaying hystheresis ΔT m ≈ 5 °C and ΔT s ≈ 20–25 °C, respectively. By investigating the effects of the initial scanning temperature (T i) on the transition enthalpies (ΔH m, ΔH s, ΔH′m and ΔH′s), we have seen that these transitions are the reverse to each other and display different kinetics.
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Acknowledgments
E.F. thanks FAPESP (2011/03566-0) and CNPq (303030/2012-7). R.D.A thanks FAPESP for Grant (2011/07414-0). The authors also thank Professor Martin Malmsten for revising the original version of the text.
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Feitosa, E., Adati, R.D. Reversibility of Thermal Transitions in Dilute Dioctadecyl-Dimethyl-Ammonium Bromide Vesicles. J Surfact Deterg 17, 1055–1058 (2014). https://doi.org/10.1007/s11743-014-1581-6
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DOI: https://doi.org/10.1007/s11743-014-1581-6