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Self-assembly of cationic gemini surfactants, alkanediyl-bis-(dimethyldodecyl- ammonium bromide), in cyclohexane: effects of spacer length on their associating into reverse lyotropic liquid crystalline or reverse vesicles

Abstract

The homogeneous solutions of cationic gemini surfactants, alkanediyl-α,ω- bis(dimethyldodecylammonium bromide), referred to as 12-s-12 where s = 2, 4, 6, 8, and 10, in cyclohexane have been prepared with the help of sodium hexanoate (SH) or sodium laurate (SL). These surfactants self-assembled in cyclohexane to form various aggregating structures, which have been characterised by small-angle X-ray scattering (SAXS) together with polarised-microscopy observations. The results showed that the 12-2-12/SH, where the gemini had the shortest spacer in this series, formed an inverse micellar cubic liquid crystalline phase of Fd3m structure. The 12-s-12/SL, including s = 4, 6, 8, which contained an adequate length spacer, formed inverse hexagonal liquid crystalline phase packed by cylindrical assemblies of surfactants. The 12-10-12/SL, in which the gemini had a longer spacer, formed dispersed reverse vesicles (a lamellar structure). The rheological properties of liquid crystalline phases in a linear visco-elastic regime were studied. The 12-2-12/SH formed a hard gel, while 12-s-12/SL formed soft gels. Dynamic light scattering and steady-state viscosity analyses were performed for the reverse vesicle solutions formed by 12-10-12/SL. In all of these systems, the amount of added water W0, denoting the mole ratio of water to gemini surfactant, was demonstrated to influence their properties.

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Publication details

The article was received on 27 Nov 2017, accepted on 28 Dec 2017 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7SM02333B
Citation: Soft Matter, 2018, Accepted Manuscript
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    Self-assembly of cationic gemini surfactants, alkanediyl-bis-(dimethyldodecyl- ammonium bromide), in cyclohexane: effects of spacer length on their associating into reverse lyotropic liquid crystalline or reverse vesicles

    S. deng and J. Zhao, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C7SM02333B

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