Electron spin echo modulation of doxylstearic acid probes of the surface and internal structure of lithium dodecyl sulfate micelles: comparison with sodium dodecyl sulfate and tetramethylammonium dodecyl sulfate micelles
Two-pulse electron spin echo modulation analyses of x-doxylstearic acid spin probes (x = 5, 7, 10, 12, and 16) in frozen lithium dodecyl sulfate (LDS) micelles in D/sub 2/O and lithium dodecyl-12,12,12-d/sub 3/ sulfate micelles in H/sub 2/O have been carried out. The results give information on the average conformation of the stearic acid chains and the distribution of D/sub 2/O and the -CD/sub 3/ end groups in the micellar aggregates. These are compared to data from dodecyl sulfate micelles with sodium or tetramethylammonium counterions (SDS and TMADS, respectively) which were studied previously in a similar fashion. The LDS micelles show a less compact and more hydrated headgroup region than SDS micelles. The -CD/sub 3/ surfactant end groups in LDS micelles are not concentrated at the micelle center but are broadly distributed throughout the micellar volume. The surface and internal structure of LDS micelles is quite comparable to that of TMADS micelles and is different from that of SDS micelles. 23 references, 2 figures.
- Research Organization:
- Wake Forest Univ., Winston-Salem, NC
- DOE Contract Number:
- AS05-80ER10745
- OSTI ID:
- 5896884
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 90:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM COMPLEXES
COMPARATIVE EVALUATIONS
DODECANOIC ACID
MOLECULAR STRUCTURE
SURFACE PROPERTIES
LITHIUM COMPLEXES
OCTADECANOIC ACID
ACOUSTIC ESR
SODIUM COMPLEXES
SULFATES
EXPERIMENTAL DATA
HEAVY WATER
ISOTOPE EFFECTS
MICELLAR SYSTEMS
WATER
ALKALI METAL COMPLEXES
CARBOXYLIC ACIDS
COMPLEXES
DATA
ELECTRON SPIN RESONANCE
HYDROGEN COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
RESONANCE
SULFUR COMPOUNDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)