Q. Lei
Surfactant-induced surface freezing at the alkane-water interface
Lei, Q.; Bain, C.D.
Abstract
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.
Citation
Lei, Q., & Bain, C. (2004). Surfactant-induced surface freezing at the alkane-water interface. Physical Review Letters, 92(17), https://doi.org/10.1103/physrevlett.92.176103
Journal Article Type | Article |
---|---|
Publication Date | Apr 30, 2004 |
Deposit Date | Apr 20, 2007 |
Journal | Physical Review Letters |
Print ISSN | 0031-9007 |
Electronic ISSN | 1079-7114 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 92 |
Issue | 17 |
DOI | https://doi.org/10.1103/physrevlett.92.176103 |
Public URL | https://durham-repository.worktribe.com/output/1551049 |
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