Vibrational mode behavior of SDS aqueous solutions studied by Raman scattering
Aqueous solutions of sodium dodecyl sulfate with concentrations between 12.6 and 100% of SDS are studied by Raman scattering. Raman spectrum behavior is followed vs. temperature, and a phase transition is observed for all samples. The authors focus their study mainly on the intensity variations of both the symmetrical and antisymmetrical vibrational modes of CH/sub 2/ groups situated in the region 2800-3000 cm/sup -1/ and on skeletal vibrations (C-C binding) in the region 1050-1150 cm/sup -1/. The study of the high-frequency part of the spectrum showed the characteristics of an order-disorder transition already studied on other materials. Apparently, the skeletal vibrational spectrum shows an unusual behavior, but polarization experiments help us to solve this difficulty. The authors show that the C-C antisymmetrical stretching mode is perturbed by a SO/sub 3/ symmetrical stretching mode appearing in the micellar phase. Concentrations of SDS between cmc and 62% can have two low-temperature phases, depending on the cooling procedure. One of these phases could be the so-called gel phase. 34 references, 15 figures, 1 table.
- Research Organization:
- Universite Rene Descartes, Paris, France
- OSTI ID:
- 6012982
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 90:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SODIUM COMPOUNDS
NORMAL-MODE ANALYSIS
RAMAN SPECTROSCOPY
SULFURIC ACID ESTERS
AQUEOUS SOLUTIONS
EXPERIMENTAL DATA
LOW TEMPERATURE
QUANTITY RATIO
VIBRATIONAL STATES
ALKALI METAL COMPOUNDS
DATA
DISPERSIONS
ENERGY LEVELS
ESTERS
EXCITED STATES
INFORMATION
LASER SPECTROSCOPY
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
SOLUTIONS
SPECTROSCOPY
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)