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Proceedings Paper

Resonant sum frequency generation studies of surfactant ordering at the oil-water interface
Author(s): Marie C. Messmer; John C. Conboy; Geraldine L. Richmond
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Paper Abstract

Total internal reflection sum frequency generation has been used to obtain the first vibrational spectrum of a simple surfactant at an oil-water interface. The system examined is sodium dodecyl sulfate (SDS) at the D2O-CCl4 interface. The spectrum of the monolayer is obtained at a series of concentrations which extend from concentrations above the critical micelle concentration of SDS in the D2O solution to interfacial concentrations as low as 0.03 monolayers. SDS shows the highest degree of order at monolayer concentrations with decreasing order displayed at lower interfacial concentrations. Significant vibrational contributions from methylene stretches of the alkyl backbone of the molecule at all concentrations suggests less order for this surfactant at the liquid-liquid interface than has been observed in previous liquid-air and solid-air studies.

Paper Details

Date Published: 25 September 1995
PDF: 7 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221500
Show Author Affiliations
Marie C. Messmer, Univ. of Oregon (United States)
John C. Conboy, Univ. of Oregon (United States)
Geraldine L. Richmond, Univ. of Oregon (United States)

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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