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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

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100278a032· OSTI ID:5896884
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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), Journal Name: J. Phys. Chem.; (United States) Vol. 90:6; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACOUSTIC ESR
ALKALI METAL COMPLEXES
AMMONIUM COMPLEXES
CARBOXYLIC ACIDS
COMPARATIVE EVALUATIONS
COMPLEXES
DATA
DODECANOIC ACID
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
HEAVY WATER
HYDROGEN COMPOUNDS
INFORMATION
ISOTOPE EFFECTS
LITHIUM COMPLEXES
MAGNETIC RESONANCE
MICELLAR SYSTEMS
MOLECULAR STRUCTURE
MONOCARBOXYLIC ACIDS
NUMERICAL DATA
OCTADECANOIC ACID
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
RESONANCE
SODIUM COMPLEXES
SULFATES
SULFUR COMPOUNDS
SURFACE PROPERTIES
WATER