Structure-property relationships in metallosurfactants

Griffiths, Peter Charles, Fallis, Ian Andrew ORCID: https://orcid.org/0000-0001-7361-0182, James, Craig ORCID: https://orcid.org/0000-0002-0569-182X, Morgan, Ian Rhys ORCID: https://orcid.org/0000-0002-0253-1855, Brett, Gemma Louise, Heenan, Richard K., Schweins, Ralf, Grillo, Isabelle and Paul, Alison ORCID: https://orcid.org/0000-0002-7653-9964 2010. Structure-property relationships in metallosurfactants. Soft Matter 6 (9) , pp. 1981-1989. 10.1039/b920143b

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Abstract

The morphology of micelles formed by three sub-classes of metallosurfactants—those with macrocyclic, linear and gemini head groups—has been studied by small-angle neutron scattering (SANS) for a series of metal- and counter-ions. All the data may be described by a model that invokes a globular micelle morphology in which the dimensions of the micelle are consistent with the known chemical structure of the constituent groups within the metallosurfactant. For two macrocyclic head group metallosurfactants, viz.1-(2-hydroxy-tetradecyl)-1,4,7-triazacyclonane that forms predominantly spherical micelles and 1-(2-hydroxy-tetradecyl)-1,4,7,10-tetraazacyclononane that forms disc-like micelles, the metal ion and its counter-ion have a negligible effect on the morphology of the micelle. Binary mixtures of surfactants with these two macrocyclic head groups (with homo- or hetero-metal ions/counter-ions) form mixed micelles whose morphology is an average of the two single component micelles. Further, as found for the single surfactant solutions, the metal and counter-ion had no effect on the morphology of the mixed surfactant micelle. Lastly, the micelle morphology of two gemini surfactants was also shown to be insensitive to the number and nature of the metal and counter-ions present, but sensitive to the structure of the head group. These observations considerably extend our understanding of the relationship between chemical structure and micelle morphology for these interesting molecules.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Subjects:	Q Science > QD Chemistry
Publisher:	Royal Society of Chemistry
ISSN:	1744-683X
Last Modified:	02 Dec 2022 12:11
URI:	https://orca.cardiff.ac.uk/id/eprint/9741

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