Self-diffusion of Water in Ionic and Nonionic Microemulsions
The self-diffusion coefficient of water in four microemulsion systems was measured using an NMR-pulsed field gradient technique. The systems studied were two containing ionic surfactants and two with nonionic surfactants. The dielectric relaxation properties of two of these systems had been previously shown to exhibit large hydration effects. Comparable self-diffusion properties were observed for the water in all of these systems that were interpreted as reflecting a combination of obstruction and hydration effects. An analysis using the Maxwell and Hanai mixture theories shows that the amount of motionally altered water corresponds to approximately two water molecules of hydration per ethylene oxide and hydroxyl group in the nonionic systems, which is in the range expected from chemical considerations. The present results show the large contribution of hydration effects to the bulk transport properties of these microemulsions. © 1985.
E. Cheever et al., "Self-diffusion of Water in Ionic and Nonionic Microemulsions," Journal of Colloid And Interface Science, Elsevier, Jan 1985.
The definitive version is available at http://dx.doi.org/10.1016/0021-9797(85)90016-5
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© 1985 Elsevier, All rights reserved.