Structure of high internal phase aqueous-in-oil emulsions and related inverse micelle solutions. 4.Surfactant mixtures

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dc.contributor.authorReynolds, PAen_AU
dc.contributor.authorGilbert, EPen_AU
dc.contributor.authorHenderson, MJen_AU
dc.contributor.authorWhite, JWen_AU
dc.date.accessioned2009-10-01T06:56:51Zen_AU
dc.date.accessioned2010-04-30T05:03:55Zen_AU
dc.date.available2009-10-01T06:56:51Zen_AU
dc.date.available2010-04-30T05:03:55Zen_AU
dc.date.issued2009-09-10en_AU
dc.date.statistics2009-09-10en_AU
dc.description.abstractThe effects of combinations of surfactants on the structure and stability of high internal phase water-in-hexadecane and saturated ammonium nitrate-in-hexadecane oil-based emulsions and oil-based inverse micellar solutions are reported, The combinations were 750, 1200, and 1700 molecular weight monodisperse and 450 and 1000 molecular weight polydisperse polyisobutylene acid amides, and sorbitan monooleate. The samples made from mixtures have qualitatively similar nanostructures to emulsions made from single surfactants. Again, for the emulsions, micrometer-scale aqueous droplets are dispersed in a continuous oil phase, which contains inverse spherical micelles composed of surfactant, hexadecane, and water. In quantitative terms, lower average surfactant molecular weight, lower ammonium nitrate content, and lower surfactant content increased the swelling of micelles, their water content, and the tendency of the emulsion to be unstable and form a sponge phase. This instability also allows micelle plasticity such that their geometry and content in mixed surfactant systems are not simply predictable by interpolation from single surfactant systems. An example was found of a mixed micelle 3 times larger than either single component micelle. The observed behavior suggests that mixing surfactant molecules of very different molecular weights destabilizes the emulsions, while mixing surfactants close in molecular weight has the opposite effect. The synergistic effects of surfactant molecular weight polydispersity and binary mixing are most marked for 1:1 molecular mixtures of surfactant. © 2009, American Chemical Societyen_AU
dc.identifier.citationReynolds, P. A., Gilbert, E. P., Henderson, M. J., & White, J. W. (2009). Structure of high internal phase aqueous-in-oil emulsions and related inverse micelle solutions. 4. Surfactant mixtures. Journal of Physical Chemistry B, 113(36), 12243-12256. doi:10.1021/jp903475zen_AU
dc.identifier.govdoc1256en_AU
dc.identifier.issn1520-6106en_AU
dc.identifier.issue36en_AU
dc.identifier.journaltitleJournal of Physical Chemistry Ben_AU
dc.identifier.pagination12243-12256en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/jp903475zen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1891en_AU
dc.identifier.volume113en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectSurfactantsen_AU
dc.subjectAqueous solutionsen_AU
dc.subjectEmulsionsen_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectOilsen_AU
dc.subjectMolecular weighten_AU
dc.titleStructure of high internal phase aqueous-in-oil emulsions and related inverse micelle solutions. 4.Surfactant mixturesen_AU
dc.typeJournal Articleen_AU
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