Water dynamics and aggregate structure in reversed micelles at sub-zero temperatures. A deuteron spin relaxation study
- 1 January 1988
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 84 (4) , 1033-1046
- https://doi.org/10.1039/f19888401033
Abstract
The microemulsion phase of the system AOT–D2O–2,2,4-trimethylpentane (TMP) has been studied by water 2H longitudinal and transverse spin relaxation measurements at three frequencies and at temperatures down to –29 °C. Additional information was obtained from n.m.r. signal intensities and quadrupolar line splittings, differential scanning calorimetry and small-angle X-ray scattering. The results establish the existence of reversed micelles with unfrozen aqueous cores containing between 2 and 4 water molecules per AOT. As the temperature is lowered, these micelles grow into very long rods. The rate of water reorientation in the core, obtained directly from the frequency-dependence of the longitudinal relaxation rate, is two orders of magnitude lower than that of bulk water at the same temperature.Keywords
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