Phase behaviour and aggregate structures of the surface-active ionic liquid [BMIm][AOT] in water

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dc.contributor.authorZhang, YXen_AU
dc.contributor.authorMarlow, JBen_AU
dc.contributor.authorWood, Ken_AU
dc.contributor.authorWang, Jen_AU
dc.contributor.authorWarr, GGen_AU
dc.contributor.authorLi, Hen_AU
dc.contributor.authorAtkin, Ren_AU
dc.date.accessioned2023-12-01T01:04:07Zen_AU
dc.date.available2023-12-01T01:04:07Zen_AU
dc.date.issued2023-12-15en_AU
dc.date.statistics2023-09-07en_AU
dc.description.abstractHypothesis: The surface-active ionic liquid, 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate ([BMIm][AOT]), has a sponge-like bulk nanostructure consisting of percolating polar and apolar domains formed by the ion charge groups and alkyl chains, respectively. We hypothesise that added water will swell the polar domains and change the liquid nanostructure. Experiments: Small angle X-ray scattering (SAXS), small angle neutron scattering (SANS) and polarizing optical microscopy (POM) were used to investigate the nanostructure of [BMIm][AOT] as a function of water content. Differential scanning calorimetry (DSC) was employed to probe the thermal transitions of [BMIm][AOT]-water mixtures and the mobility of water molecules. Findings: SAXS, SANS and POM show that at lower water contents, [BMIm][AOT]-water mixtures have a sponge-like nanostructure similar to the pure SAIL, at medium water contents a lamellar phase forms, and at high water contents vesicles form. DSC results reveal that water molecules are supercooled in the lamellar phase. For the first time, results reveal a series of transitions from inverse sponge, to lamellar then to vesicles, for [BMIm][AOT] upon dilution with water. © 2023 Elsevier Inc.en_AU
dc.description.sponsorshipThe authors thank the facilities of Sydney Analytical, a core research facility at the University of Sydney, for SAXS measurements. The authors thank ANSTO for SANS measurements and thank Dr Paul Fitzgerald for valuable discussions. YZ thanks the China Scholarship Council and the Australian Institute of Nuclear Science and Engineering for PhD scholarships. This work was supported by Australian Research Council Discovery Projects (DP200102248 and DP210102119).en_AU
dc.identifier.citationZhang, Y., Marlow, J. B., Wood, K., Wang, J., Warr, G. G., Li, H., & Atkin, R. (2023). Phase behaviour and aggregate structures of the surface-active ionic liquid [BMIm][AOT] in water. Journal of Colloid and Interface Science, 652, Part A, 749-757. doi:10.1016/j.jcis.2023.08.049en_AU
dc.identifier.issn0021-9797en_AU
dc.identifier.issuePart Aen_AU
dc.identifier.journaltitleJournal of Colloid and Interface Scienceen_AU
dc.identifier.pagination749-757en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15257en_AU
dc.identifier.volume652en_AU
dc.publisherElsevier B.V.en_AU
dc.relation.urihttps://doi.org/10.1016/j.jcis.2023.08.049en_AU
dc.subjectWateren_AU
dc.subjectLiquidsen_AU
dc.subjectNanostructuresen_AU
dc.subjectSmall angle scatteringen_AU
dc.subjectMoleculesen_AU
dc.subjectScatteringen_AU
dc.subjectSurfactantsen_AU
dc.titlePhase behaviour and aggregate structures of the surface-active ionic liquid [BMIm][AOT] in wateren_AU
dc.typeJournal Articleen_AU
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