Observation and Molecular Ordering at the Liquid-Liquid Interface by Resonant Sum Frequency Generation

The vibrational spectrum of an amphiphilic surfactant, sodium dodecyl sulfate (SDS) at the interface between two immisicible liquids, D2O/CCl4, has been obtained for the first time by resonant sum frequency generation. The vibrational spectra obtained offer spectroscopic evidence for interfacial ord...

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Hauptverfasser:	Messmer, Marie C, Conboy, John C, Richmond, G. L
Format:	Report
Sprache:	eng
Schlagworte:	AIR ALKYL RADICALS AMPHIPHILIC Atomic and Molecular Physics and Spectroscopy CHAINS DODECANE FREQUENCY IMMISICIBLE Inorganic Chemistry INTENSITY INTERFACES LIQUID PHASES METHYL RADICALS METHYLENES MOLECULAR ORDERING Organic Chemistry PEAK VALUES PHASE TRANSFORMATIONS Physical Chemistry Radiofrequency Wave Propagation RATIOS RESONANCE SODIUM DODECYL SULFATE SODIUM SULFATES SPECTRA SPECTROSCOPY SUM FREQUENCY SURFACE ACTIVE SUBSTANCES SURFACES VIBRATIONAL SPECTRA
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Zusammenfassung:	The vibrational spectrum of an amphiphilic surfactant, sodium dodecyl sulfate (SDS) at the interface between two immisicible liquids, D2O/CCl4, has been obtained for the first time by resonant sum frequency generation. The vibrational spectra obtained offer spectroscopic evidence for interfacial ordering of the alkyl chain as a function of surface coverage. Analysis of the ratio of the methyl/methylene peak intensities as a function of bulk aqueous phase concentration of SDS suggests that unlike the liquid-air and solid-liquid interfaces SDS is considerably more disordered at the liquid-liquid interface. jg