Neutron scattering study of a membrane phase miscibility gap: coexistence of L3 "sponge" and La Lamellar phases

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dc.contributor.authorHamilton, WAen_AU
dc.contributor.authorPorcar, Len_AU
dc.date.accessioned2011-09-22T01:04:32Zen_AU
dc.date.available2011-09-22T01:04:32Zen_AU
dc.date.issued2010-12-16en_AU
dc.date.statistics2011-09-21en_AU
dc.description.abstractWe report on a small angle neutron scattering (SANS) study of a temperature driven first order phase transition in a 25wt% solution of the surfactant AOT (Sodium Di-2-ethylhexyl Sulfosuccinate) in 1.5wt% heavy brine between an isotropic L3 "sponge" state at 27°C and a stacked lamellar Lα monophase 55°C. The prominent scattering features of these phases are correlation peaks due to the mean passage size of the L3 sponge and the Lα stacking separation. This ratio of the monophase peak positions Qα/Q31.3, is consistent with previous observations in this and similar systems. In the present study we tracked this system through the intermediate L3 +Lα biphasic miscibility gap. There the initial appearance of the Lα peak at 33.25°C was at a scattering vector some 23% higher than the final high temperature monophase value. During coexistence both L3 and Lα phase peak positions decreased linearly with increasing temperature maintaining a roughly constant ratio Qα/Q3 ~1.6-1.7. Two phase fits to the scattering data and application of scaling law predictions allow us to obtain local L3 phase volume fractions in the biphasic region and make preliminary determinations of the structural accomodations necessitated by phase coexistence in this system's miscibility gap.© 2010, Insitute of Physicsen_AU
dc.identifier.articlenumber012034en_AU
dc.identifier.citationHamilton, W. A. & Porcar, L. (2010). Neutron scattering study of a membrane phase miscibility gap: coexistence of L3 "sponge" and La Lamellar phases. Paper presented to the International Conference on Neutron Scattering 2009, 3th–7th May 2009. Knoxville, Tennessee, USA. In Journal of Physics: Conference Series, 251, 012034. doi:10.1088/1742-6596/251/1/012034en_AU
dc.identifier.conferenceenddate7 May 2009en_AU
dc.identifier.conferencenameInternational Conference on Neutron Scattering 2009en_AU
dc.identifier.conferenceplaceKnoxville, Tennesseeen_AU
dc.identifier.conferencestartdate3 May 2009en_AU
dc.identifier.govdoc3439en_AU
dc.identifier.issn1742-6596en_AU
dc.identifier.journaltitleJournal of Physics: Conference Seriesen_AU
dc.identifier.urihttp://dx.doi.org/10.1088/1742-6596/251/1/012034en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3765en_AU
dc.identifier.volume251en_AU
dc.language.isoenen_AU
dc.publisherInsitute of Physicsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectMembranesen_AU
dc.subjectSolubilityen_AU
dc.subjectSurfactantsen_AU
dc.subjectCorrelationsen_AU
dc.subjectPhase studiesen_AU
dc.titleNeutron scattering study of a membrane phase miscibility gap: coexistence of L3 "sponge" and La Lamellar phasesen_AU
dc.typeConference Paperen_AU
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