Lyotropic and interfacial behaviour of an anionic gemini surfactant

Dix, Leslie and Gilblas, R. (2006) Lyotropic and interfacial behaviour of an anionic gemini surfactant. Journal of Colloid and Interface Science, 296 (2). pp. 762-765. ISSN 0021-9797

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The sodium salt of N,N′-hexane-bis (1-dodecen-1-ylsuccinamic acid) is an anionic dimeric (gemini) surfactant. A flooding penetration scan of this surfactant in water demonstrates a sequence of lyotropic phases at room temperature (20 °C). Preparation of surfactant–water mixtures has resulted in a phase diagram which shows that the same sequence of phases exists up to 100 °C. These phases are tentatively assigned to the sequence: micellar to normal hexagonal (H1) to cubic (V1) to lamellar (Lα). The interfacial tension at the n-heptane/water interface has been determined in the presence of this surfactant. The surfactant head group area at the interface is large (2.8±0.3 nm2 at 298 K) and the interfacial tension above the critical micelle concentration is low (7 mN m−1), but considerably higher than the ultra-low values that have been reported for cationic dimeric surfactants at various hydrocarbon–water interfaces.

Item Type: Article
Subjects: F100 Chemistry
Department: Faculties > Health and Life Sciences > Applied Sciences
Depositing User: Les Dix
Date Deposited: 20 Sep 2012 14:50
Last Modified: 12 Oct 2019 17:30

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