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Title: Self-Assembly of Long-Chain Betaine Surfactants: Effect of Tailgroup Structure on Wormlike Micelle Formation
Contributor(s): Kelleppan, Veena T (author); Moore, Jackson E (author); McCoy, Thomas M (author); Sokolova, Anna V (author); Campo, Liliana de (author); Wilkinson, Brendan (author)orcid ; Tabor, Rico F (author)
Publication Date: 2018
DOI: 10.1021/acs.langmuir.7b02830
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Abstract: Long-chain amidopropyl betaines are known for their ability to self-assemble into viscoelastic wormlike micellar structures. Here, we explore the effect of tailgroup molecular architecture on this process, comparing five molecules, each with C18 chains but different levels of unsaturation and branching. The surfactants are synthesized from stearic, oleic, linoleic, linolenic, and isostearic acids. The self-assembly of these molecules in aqueous solutions is explored using small- and ultra-small-angle neutron scattering (SANS and USANS). It is seen that optimum wormlike micelle formation is achieved for the oleic-chained surfactant, and the alignment of self-assembled structures is further explored using rheo-SANS. The more highly unsaturated molecules form rodlike micelles, whereas the stearic-tailed molecule shows a pronounced Krafft point and the isostearic-chained surfactant is entirely water-insoluble. These results demonstrate the critical importance of tailgroup geometry on surfactant properties and self-assembly for this industrially important class of surfactants.
Publication Type: Journal Article
Grant Details: ARC/FT160100191
Source of Publication: Langmuir, 34(3), p. 970-977
Publisher: American Chemical Society
Place of Publication: United States of America
ISSN: 0743-7463
Field of Research (FOR): 030304 Physical Chemistry of Materials
030603 Colloid and Surface Chemistry
030503 Organic Chemical Synthesis
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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