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

被引:8
作者
Zhang, Yunxiao [1 ]
Marlow, Joshua B. [2 ,3 ]
Wood, Kathleen [4 ]
Wang, Jianan [1 ]
Warr, Gregory G. [2 ,3 ]
Li, Hua [1 ,5 ]
Atkin, Rob [1 ]
机构
[1] Univ Western Australia, Sch Mol Sci, Perth, WA, Australia
[2] Univ Sydney, Sch Chem, Camperdown, NSW 2006, Australia
[3] Univ Sydney, Sydney Nano Inst, Camperdown, NSW 2006, Australia
[4] Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia
[5] Univ Western Australia, Ctr Microscopy Characterisat & Anal, Perth, WA, Australia
基金
澳大利亚研究理事会;
关键词
Surface -active ionic liquid; Sponge-like; Lamellar; Vesicle; Phase sequence; ANGLE NEUTRON-SCATTERING; AEROSOL-OT; CRYSTALLINE PHASE; DODECYL-SULFATE; X-RAY; LAMELLAR; MIXTURES; FRICTION; BROMIDE; SULFOSUCCINATE;
D O I
10.1016/j.jcis.2023.08.049
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hypothesis: 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 spongelike 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.
引用
收藏
页码:749 / 757
页数:9
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