Structure and growth of bis(2-ethylhexyl) sulfosuccinate micelles in aqueous solutions
The structure and growth of micelles formed by anionic surfactant sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in aqueous solutions have been studied by small angle neutron scattering (SANS). They used the contrast variation technique to determine the aggregation number, the effective charge, and two molecular parameters of the micelles in solutions of 0.8 g/dL surfactant concentration. They then used these two molecular parameters to analyze micellar solutions at other concentrations. Two micellar parameters, the mean aggregation number n and the effective charge z0, have been extracted from experimental data for solutions with surfactant concentrations ranging from 0.2 to 1.0 g/dL. The minimum micellar aggregation number is predicted to be 15 at the critical micellar concentration (cmc) and the structure is a compact spherical aggregate having well-defined hydrophobic and hydrophilic regions. The micelles grow moderately as the surfactant concentration increases, transforming from a spherical to an oblate spheroidal shape in a manner describable by the ladder model.
- Research Organization:
- Massachusetts Institute of Technology, Cambridge
- OSTI ID:
- 6295162
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBOXYLIC ACID SALTS
CHEMICAL PREPARATION
MOLECULAR STRUCTURE
MICELLAR SYSTEMS
SMALL ANGLE SCATTERING
SODIUM COMPLEXES
SUCCINIC ACID
SULFONATES
ANIONS
EXPERIMENTAL DATA
HEAVY WATER
NEUTRON REACTIONS
QUANTITY RATIO
SPHERES
SPHEROIDS
ALKALI METAL COMPLEXES
BARYON REACTIONS
CARBOXYLIC ACIDS
CHARGED PARTICLES
COMPLEXES
DATA
DICARBOXYLIC ACIDS
HADRON REACTIONS
HYDROGEN COMPOUNDS
INFORMATION
IONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
SCATTERING
SYNTHESIS
WATER
400201* - Chemical & Physicochemical Properties
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)