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Interfacial activity and micellar morphology of an imidazolium ring containing zwitterionic surfactants

Ali, Hazrat, Khan, Azim, Ahmad, Tauqeer, Dervisi, Athanasia, Fallis, Ian, Shoetan, Ibrahim O., Khan, Abbas, Hussain, Arshad and Griffiths, Peter 2022. Interfacial activity and micellar morphology of an imidazolium ring containing zwitterionic surfactants. Journal of Surfactants and Detergents 25 (3) , pp. 341-350. 10.1002/jsde.12573
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Abstract

Zwitterionic surfactants based on 3-(1-alkyl-3-imidazolio) propane-sulfonate ([ImS3-R] where R is octyl or dodecyl) is an emerging and important class of amphiphile due to their relevance as nano reactors for the synthesis of metallic nanoparticles and accelerated acid hydrolysis. The physicochemical properties of such synthesized imidazolium ring-containing zwitterionic surfactants have been characterized by surface tension and small-angle neutron scattering (SANS) techniques. Surface tension measurements were used to calculate several thermodynamic parameters over a range of concentrations and temperatures (298–313 K). The results obtained showed a weak signature representing the critical micelle concentration (CMC) for ImS3-8, however, by increasing the alkyl length of the hydrophobic group to dodecyl, that is, ImS3-8 to ImS3-12, the signature of the CMC was much more evident. As expected, the CMC for ImS3-12 shifted to a lower concentration. An increase in temperature increased the surface activity and decreased the CMC of both zwitterionic surfactants, although the changes were small. Compared to classical surfactants, that is, sodium dodecyl sulfate and dodecyl trimethylammonium bromide, the CMC of ImS3-12 is much lower. Modeling of SANS data demonstrated that the morphology of the micelles formed by these amphiphiles may be described by the “classical” model, a central hydrophobic core, with a shell of hydrated headgroups. Due to their widespread applications in colloidal and interfacial science, the present study adds new insight to the fundamental understanding of these interesting imidazolium-based surface-active ionic liquids (ImS3-R).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Springer
ISSN: 1097-3958
Date of First Compliant Deposit: 17 March 2022
Date of Acceptance: 17 December 2021
Last Modified: 31 May 2022 16:34
URI: https://orca.cardiff.ac.uk/id/eprint/148440

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