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Surfactant-induced surface freezing at the alkane-water interface.

Lei, Q. and Bain, C. D. (2004) 'Surfactant-induced surface freezing at the alkane-water interface.', Physical review letters., 92 (17). p. 176103.


Long-chain alkanes exhibit surface freezing at the alkane-air but not the alkane-water interface. Ellipsometry and surface tensiometry are used to show that a simple cationic surfactant, hexadecyltrimethylammonium bromide (CTAB), can induce surface freezing at the tetradecane-water interface even when present in mole fractions as low as 0.1. The surface-freezing temperature Ts is a linear function of the interfacial excess of CTAB. The excess surface entropy below Ts, S = –0.76±0.02 mJ K–1 m–2, is consistent with a rotator phase. Ellipsometry provides strong evidence for a frozen monolayer in which the chains are oriented near the surface normal.

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Record Created:20 Apr 2007
Last Modified:20 Dec 2017 11:20

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