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Motions of water, decane, and bis(2-ethylhexyl)sulfosuccinate sodium salt in reverse micelle solutions

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dc.contributor.author Schwartz, Leslie en_US
dc.contributor.author DeCiantis, C. en_US
dc.contributor.author Chapman, S. en_US
dc.contributor.author Kelley, B. en_US
dc.contributor.author Hornak, Joseph en_US
dc.date.accessioned 2006-07-19T19:36:48Z en_US
dc.date.available 2006-07-19T19:36:48Z en_US
dc.date.issued 1999-08-17 en_US
dc.identifier.citation Langmuir 15N17 (1999) 5461-5466 en_US
dc.identifier.issn 1520-5827 en_US
dc.identifier.uri http://hdl.handle.net/1850/2159 en_US
dc.description.abstract Reverse micellar solutions made from the surfactant bis(2-ethylhexyl)sulfosuccinate sodium salt (AOT), water, and decane have been studied using NMR inversion-recovery and pulsed-field gradient experiments. Spin-lattice relaxation times, T1, and diffusion coefficients, D, were measured for the individual components of the reverse micellar phase of the water-AOT-decane microemulsion as a function of temperature, 277 < T < 313 K, and reverse micelle volume fraction, 0 < < 1. Activation energies for the decane rotational motions probed by the T1 measurements and those for the translational motions probed by the D measurements are compared as a function of . Both types of activation energies increase by a factor of ~2 as increases from zero (pure decane) to 0.8 (near the lamellar phase boundary), indicating the influence of the AOT tails on the decane motions. A T- phase diagram has been constructed showing an empirical boundary for the onset of percolation. This percolation characterization, together with the measured diffusion coefficients and relaxation times, is consistent with previous descriptions of the structure and dynamics of water-AOT-decane and similar microemulsions reported in the literature. This study also continues the evaluation of the water-AOT-decane microemulsion as the signal-bearing solution in a magnetic resonance imaging phantom. The T1 of the water phase matches that of nonfatty tissues in the body; however, the hydrocarbon component will need to be adjusted to match its T1 to that of adipose tissue. The percolation boundary in the T- phase diagram helps to define the T and values where the solution possesses the high dielectric constant needed to minimize a standing wave artifact in a magnetic resonance image of the phantom. en_US
dc.description.sponsorship We thank St. John Fisher College for funding the sabbatical leave for L.J.S. and NSF REU CHE-9424025 for sponsoring S.C. and C.L.D. en_US
dc.format.extent 31371 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher The American Chemical Society: Langmuir en_US
dc.subject Microemulsion en_US
dc.subject Reverse micellar solutions en_US
dc.subject Water phase en_US
dc.title Motions of water, decane, and bis(2-ethylhexyl)sulfosuccinate sodium salt in reverse micelle solutions en_US
dc.type Abstract en_US
dc.identifier.url http://dx.doi.org/10.1021/la9812119

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