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Issue 40, 2013
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Wormlike micelles formed using Gemini surfactants with quaternary hydroxyethyl methylammonium headgroups

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Abstract

The aggregation behavior of Gemini surfactants with hydroxyl groups in their headgroups, butane-1,4-bis(hydroxyethyl methylalkylammonium) bromides hereafter abbreviated as m-4-m MEA (m = 12, 14, 16), has been investigated in aqueous solution. Each formed a viscous fluid in water at low concentration in the absence of a salt. In solutions of 14-4-14 MEA, the formation of highly viscoelastic wormlike micelles could be detected using steady and dynamic rheological measurements. The existence of these long column micelles has also been confirmed using cryo-transmission electron microscopy (cryo-TEM) and small angle X-ray scattering (SAXS). Compared with conventional bis(dimethylalkylammonium) bromide Gemini molecules with the same spacer (14-4-14), 14-4-14 MEA demonstrated a better ability to fabricate wormlike micelles because of the change in the headgroup structure. As for 16-4-16 MEA, which has longer alkyl chains, its aqueous solutions behave more like elastic gels at a concentration of 80 mmol Lāˆ’1. The unique viscoelastic behavior of m-4-m MEA in water can be attributed to the synergistic interactions of hydrophobic attraction and hydrogen bonding. The obtained results are believed to be an important addition to the effect that the headgroups of Gemini surfactants have on their aggregation behavior in dilute solutions.

Graphical abstract: Wormlike micelles formed using Gemini surfactants with quaternary hydroxyethyl methylammonium headgroups

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Publication details

The article was received on 24 Jun 2013, accepted on 28 Jul 2013 and first published on 12 Aug 2013


Article type: Paper
DOI: 10.1039/C3SM51722E
Citation: Soft Matter, 2013,9, 9667-9674

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    Wormlike micelles formed using Gemini surfactants with quaternary hydroxyethyl methylammonium headgroups

    Q. Li, X. Wang, X. Yue and X. Chen, Soft Matter, 2013, 9, 9667
    DOI: 10.1039/C3SM51722E

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