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Proceedings Paper

Sum-frequency vibrational spectroscopy of the solid-liquid interface
Author(s): David C. Duffy; Paul B. Davies; Colin D. Bain; Robert N. Ward; Andrew M. Creeth
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Paper Abstract

Sum-frequency spectroscopy (SFS) has been used to elucidate the structure of surfactant monolayers at the hydrophobic solid-water interface. The polar orientation and conformational order of a series of surfactant molecules has been determined from the vibrational spectra of their hydrocarbon chains in the C-H stretching region. The SF spectra of inorganic (thiocyanate and cyanide) and aromatic (tosylate, benzoate, and salicylate) counterions indicate that they bind to a monolayer of charged surfactant with a net polar orientation. The spectra of the aromatic anions bound to a surfactant monolayer at the air-water interface are also presented. The interactions between co-adsorbed surfactant and polymer has been examined-- the spectra of the surfactant indicate that an oppositely charged polymer causes a monolayer of the surfactant to adsorb at much lower bulk concentrations than in the absence of the polymer. In one case, the bound polymer has a SF-active resonance indicating that the polymer is also orientationally ordered at the solid-water interface.

Paper Details

Date Published: 25 September 1995
PDF: 10 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221487
Show Author Affiliations
David C. Duffy, Univ. of Cambridge (United Kingdom)
Paul B. Davies, Univ. of Cambridge (United Kingdom)
Colin D. Bain, Univ. of Oxford (United Kingdom)
Robert N. Ward, Unilever Research (United Kingdom)
Andrew M. Creeth, Unilever Research (United Kingdom)

Published in SPIE Proceedings Vol. 2547:
Laser Techniques for Surface Science II
Janice M. Hicks; Wilson Ho; Hai-Lung Dai, Editor(s)

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