Resonant sum frequency generation studies of surfactant ordering at the oil-water interface

Marie C. Messmer; John C. Conboy; Geraldine L. Richmond

doi:10.1117/12.221500

25 September 1995 Resonant sum frequency generation studies of surfactant ordering at the oil-water interface

Marie C. Messmer, John C. Conboy, Geraldine L. Richmond

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221500
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

Marie C. Messmer, John C. Conboy, and Geraldine L. Richmond "Resonant sum frequency generation studies of surfactant ordering at the oil-water interface", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221500

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