Isomeric and concentration effects of C4-cosurfactants on four-component microemulsions investigated by neutron spin-echo and small-angle scattering

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dc.contributor.author Zambrano, Elvis en_US
dc.contributor.author Kotlarchyk, Michael en_US
dc.contributor.author Langner, Andreas en_US
dc.contributor.author Faraone, Antonio en_US
dc.date.accessioned 2007-07-05T15:47:52Z en_US
dc.date.available 2007-07-05T15:47:52Z en_US
dc.date.issued 2006-08-24 en_US
dc.identifier.citation Journal of Physics: Condensed Matter 18N36 (2006) S2451-S2466 en_US
dc.identifier.issn 0953-8984 en_US
dc.identifier.uri http://hdl.handle.net/1850/4369 en_US
dc.description.abstract Neutron spin-echo spectroscopy and small-angle scattering measurements were performed to determine how the isomeric structure and concentration of C4-cosurfactants (i.e. butyl alcohols) influence structure and dynamics in four-component water-in-oil microemulsions. The system investigated was AOT/butanol/water/n-octane at room temperature (AOT denotes sodium di-2-ethyl hexylsulfosuccinate), deuterated to achieve contrast of the surfactant/cosurfactant film. At a fixed volume fraction of 0.06 and a fixed molar ratio of [water]/[AOT] = 20, we studied the effects of increasing the molar ratio of [butanol]/[AOT] from 0 to 30. Data from samples containing the cosurfactant n-butyl alcohol were compared with samples prepared with tert-butyl alcohol and, in a few cases, sec-butyl alcohol. Data were analysed using a core–shell model for polydisperse spherical droplets, allowing for the presence of shape fluctuations. It was found that all structural isomers of the cosurfactant led to a similar decrease in droplet size with increasing alcohol content. In all cases, droplet size and shape fluctuations were observed to increase with alcohol content; however, the effect was most pronounced for size fluctuations (i.e. polydispersity) in the presence of tert-butanol. The data indicates that tert-butanol has a higher degree of penetration into the water core, leading to a reduced influence on the effective area per surfactant head group on the droplet surface. There is also evidence that an increased droplet–droplet attraction upon adding tert-butanol drives phase separation in the system. en_US
dc.language.iso en_US en_US
dc.publisher Institute of Physics and IOP Publishing Limited en_US
dc.relation.ispartofseries vol. 18 en_US
dc.relation.ispartofseries no. 36 en_US
dc.title Isomeric and concentration effects of C4-cosurfactants on four-component microemulsions investigated by neutron spin-echo and small-angle scattering en_US
dc.type Article en_US
dc.identifier.url http://dx.doi.org/10.1088/0953-8984/18/36/S17

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