Properties and structures of three- and four-component microemulsions

J. E. Puig; I. Rodríguez-Siordia; L. I. Rangel-Zamudio; J. F. Billman; E. W. Kaler

doi:10.1021/la00082a005

Properties and structures of three- and four-component microemulsions

J. E. Puig, I. Rodríguez-Siordia, L. I. Rangel-Zamudio, J. F. Billman, E. W. Kaler

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Abstract

We report phase behavior, small-angle X-ray scattering (SAXS), fluorescence spectroscopy, conductimetry, and differential scanning calorimetry of didodecyldimethylammonium bromide (DDAB)/cyclohexane/water and DDAB/decane/ water microemulsions with and without NaBr. We demonstrate that the hydrocarbon tails of the surfactant are fluid in microemulsions at room temperature. The observed phase behavior exhibits a complex dependence upon salt concentration, yet microemulsion structure as probed by SAXS and conductimetry is not altered by the addition of salt. Pyrene fluorescence is used to probe the internal interfacial layers, and evidence for the compression of the surfactant tails with decreasing curvature is obtained.

Original language	English (US)
Pages (from-to)	806-812
Number of pages	7
Journal	Langmuir
Volume	4
Issue number	4
DOIs	https://doi.org/10.1021/la00082a005
State	Published - Jul 1 1988

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AU - Puig, J. E.

AU - Rodríguez-Siordia, I.

AU - Rangel-Zamudio, L. I.

AU - Billman, J. F.

AU - Kaler, E. W.

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AB - We report phase behavior, small-angle X-ray scattering (SAXS), fluorescence spectroscopy, conductimetry, and differential scanning calorimetry of didodecyldimethylammonium bromide (DDAB)/cyclohexane/water and DDAB/decane/ water microemulsions with and without NaBr. We demonstrate that the hydrocarbon tails of the surfactant are fluid in microemulsions at room temperature. The observed phase behavior exhibits a complex dependence upon salt concentration, yet microemulsion structure as probed by SAXS and conductimetry is not altered by the addition of salt. Pyrene fluorescence is used to probe the internal interfacial layers, and evidence for the compression of the surfactant tails with decreasing curvature is obtained.

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Properties and structures of three- and four-component microemulsions

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