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Understanding the structure and dynamics of cationic surfactants from studies of pure solid phases
UCL, Christopher Ingold Labs, Dept Chem, 20 Gordon St, London WC1H 0AJ, England.
UCL, Christopher Ingold Labs, Dept Chem, 20 Gordon St, London WC1H 0AJ, England.ORCID iD: 0000-0001-8466-5621
UCL, Dept Chem Engn, Torrington Pl, London WC1E 7JE, England.ORCID iD: 0000-0002-1931-7038
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
2019 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 21, no 47, p. 25945-25951Article in journal (Refereed) Published
Abstract [en]

A homologous series of n-alkyl trimethylammonium bromide surfactants, H(CH2)(n)N+(CH3)(3) Br-, from C(10)TAB to C(18)TAB have been studied systematically in the bulk over a wide range of temperatures. Common features in the structures are identified, with packing dominated by the co-ordination of the cationic head groups with bromide anions and interdigitation of the hydrocarbon chains. This arrangement provides an explanation for the thin adsorbed bilayers that have been observed at various hydrophilic surfaces from aqueous solutions in previous studies. The molecular volumes and arrangement are comparable with structures of a number of different self-assembled amphiphiles. For these surfactants with bromide counter-ions, formation of crystal hydrates was not observed. The alkyl chains are highly mobile and at high temperatures a plastic phase is found for all materials with a transition enthalpy that is similar to the melting enthalpy of many long alkyl chains. Other unexpected phase transitions depend more markedly on the hydrocarbon chain length and evidently depend on delicate balances of the various contributions to the free energy.

Place, publisher, year, edition, pages
2019. Vol. 21, no 47, p. 25945-25951
National Category
Physical Chemistry
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URN: urn:nbn:se:uu:diva-400747DOI: 10.1039/c9cp04486hISI: 000501356000032PubMedID: 31595275OAI: oai:DiVA.org:uu-400747DiVA, id: diva2:1382585
Available from: 2020-01-03 Created: 2020-01-03 Last updated: 2020-01-03Bibliographically approved

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