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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|Publisher Web site:||http://dx.doi.org/10.1103/PhysRevLett.92.176103|
|Record Created:||20 Apr 2007|
|Last Modified:||20 Sep 2010 16:19|
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