Accession Number:

ADA295484

Title:

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

Descriptive Note:

Technical rept. Jun 94-May 95,

Corporate Author:

OREGON UNIV EUGENE DEPT OF CHEMISTRY

Personal Author(s):

• Messmer, Marie C.
• Conboy, John C.
• Richmond, G. L.

Report Date:

1995-06-12

Pagination or Media Count:

11.0

Abstract:

The vibrational spectrum of an amphiphilic surfactant, sodium dodecyl sulfate SDS at the interface between two immisicible liquids, D2OCCl4, 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 methylmethylene 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

Descriptors:

• *FREQUENCY
• *LIQUID PHASES
• *RESONANCE
• PEAK VALUES
• RATIOS
• SPECTROSCOPY
• METHYL RADICALS
• AIR
• INTERFACES
• PHASE TRANSFORMATIONS
• INTENSITY
• SURFACES
• SPECTRA
• CHAINS
• SURFACE ACTIVE SUBSTANCES
• METHYLENES
• ALKYL RADICALS
• VIBRATIONAL SPECTRA
• DODECANE
• SODIUM SULFATES

Subject Categories:

• Inorganic Chemistry
• Organic Chemistry
• Physical Chemistry
• Atomic and Molecular Physics and Spectroscopy
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE