Abstract
Upon coalescence and decoalescence of reversed micellar aggregates, molecules solubilized in the water cores are exchanged and redistributed between aggregates. Investigation of the solubilizate exchange phenomenon is of interest to understand the mechanism of coalescence and to assess the possibility of transport limitations for chemical and biochemical reactions. We have studied solubilizate exchange in the system dodecyltrimethylammoniumchloride (DTAC)/hexanol/n-heptane/water through electron transfer indicator reactions with the Continuous Flow Method with Integrating Observation (CFMIO). Solubilizate exchange rate constants kex of 106–107 (Ms)−1 were obtained with a novel population balance model incorporating distribution effects of probe molecules across reversed micellar aggregates. Such rate constants are two to three orders of magnitude slower than those for molecular diffusion. The results are consistent with opening of the surfactant layer upon coalescence as the rate-determining step.
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Bommarius, A.S., Wang, D.I.C., Hatton, T.A., Holzwarth, J.F. (1990). A Population Balance Model for the Determination of Solubilizate Exchange Rate Constants in Reversed Micellar Systems. In: Bloor, D.M., Wyn-Jones, E. (eds) The Structure, Dynamics and Equilibrium Properties of Colloidal Systems. NATO ASI Series, vol 324. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3746-1_13
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DOI: https://doi.org/10.1007/978-94-011-3746-1_13
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