Stability of high internal phase emulsions at low surfactant concentration studied by small angle neutron scattering

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dc.contributor.authorReynolds, PAen_AU
dc.contributor.authorMcGillivray, DJen_AU
dc.contributor.authorMata, JPen_AU
dc.contributor.authorYaron, PNen_AU
dc.contributor.authorWhite, JWen_AU
dc.date.accessioned2010-08-15T23:58:46Zen_AU
dc.date.available2010-08-15T23:58:46Zen_AU
dc.date.issued2010-09-15en_AU
dc.date.statistics2010-09-15en_AU
dc.description.abstractThe changes in structure of high internal phase emulsions at low concentrations and at elevated temperature are reported for comparison with the same emulsions under conditions well away from instability. Small angle neutron scattering measurements on aqueous ammonium nitrate droplets dispersed in hexadecane and stabilized by very small quantities of a polyisobutylene-based surfactant (PIBSA) as well as related inverse micellar solutions in hexadecane, have been made as a function of temperature and surfactant concentration. Experimental conditions here favour larger and more deformable droplets than in previous studies. Besides the expected micelles and adsorbed surfactant, planar bilayers of micron lateral extent between touching droplets cover 20% of the droplet surface. Another difference from previous experiments is that the oil phase in the emulsions, and corresponding inverse micellar solutions are different in micellar radii and composition. The differences, and changes with surfactant concentration and temperature, are attributed to fractionation of the polydisperse PIBSA in the emulsions, but not the inverse micellar solutions. At low PIBSA concentration and high temperature the SANS shows emulsion decomposing into separate oil and aqueous phases. This occurs when the micelle concentration reaches a very small but measurable value. The inverse micelles may suppress by steric action long wavelength unstable capillary waves in the bilayers. Depletion repulsion forces here have a minor role in the emulsion stabilization. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationReynolds, P. A., McGillivray, D. J., Mata, J. P., Yaron, P. N., & White, J. W. (2010). Stability of high internal phase emulsions at low surfactant concentration studied by small angle neutron scattering. Journal of Colloid and Interface Science, 349(2), 544-553. doi:10.1016/j.jcis.2010.05.082en_AU
dc.identifier.govdoc2401en_AU
dc.identifier.issn0021-9797en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleJournal of Colloid and Interface Scienceen_AU
dc.identifier.pagination544-553en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jcis.2010.05.082en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2201en_AU
dc.identifier.volume349en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectEmulsionsen_AU
dc.subjectCapillary flowen_AU
dc.subjectHexadecaneen_AU
dc.subjectSurfactantsen_AU
dc.subjectMicellar systemsen_AU
dc.titleStability of high internal phase emulsions at low surfactant concentration studied by small angle neutron scatteringen_AU
dc.typeJournal Articleen_AU
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