Sum-frequency vibrational spectroscopy of the solid-liquid interface

David C. Duffy; Paul B. Davies; Colin D. Bain; Robert N. Ward; Andrew M. Creeth

doi:10.1117/12.221487

25 September 1995 Sum frequency vibrational spectroscopy of the solid-liquid interface

David C. Duffy, Paul B. Davies, Colin D. Bain, Robert N. Ward, Andrew M. Creeth

Proceedings Volume 2547, Laser Techniques for Surface Science II; (1995) https://doi.org/10.1117/12.221487
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

Citation Download Citation

David C. Duffy, Paul B. Davies, Colin D. Bain, Robert N. Ward, and Andrew M. Creeth "Sum frequency vibrational spectroscopy of the solid-liquid interface", Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); https://doi.org/10.1117/12.221487

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