Structure and growth of bis(2-ethylhexyl) sulfosuccinate micelles in aqueous solutions

Journal Article · Thu Jun 04 04:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100296a039· OSTI ID:6295162

Sheu, E Y; Chen, S; Huang, J S

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), Journal Name: J. Phys. Chem.; (United States) Vol. 91:12; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPLEXES
ANIONS
BARYON REACTIONS
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHARGED PARTICLES
CHEMICAL PREPARATION
COMPLEXES
DATA
DICARBOXYLIC ACIDS
EXPERIMENTAL DATA
HADRON REACTIONS
HEAVY WATER
HYDROGEN COMPOUNDS
INFORMATION
IONS
MICELLAR SYSTEMS
MOLECULAR STRUCTURE
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
QUANTITY RATIO
SCATTERING
SMALL ANGLE SCATTERING
SODIUM COMPLEXES
SPHERES
SPHEROIDS
SUCCINIC ACID
SULFONATES
SYNTHESIS
WATER