Micellization of ionic surfactants. Calculations based on a self-consistent field lattice model

Journal Article · Thu Nov 14 04:00:00 EST 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100176a095· OSTI ID:7163583

Boehmer, M R; Koopal, L K; Lyklema, J ^[1]

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1. Wageningen Agricultural Univ., Dreijenplein (Netherlands)

The equilibrium structure of micelles formed in aqueous solutions of ionic surfactants is studied by using the self-consistent field lattice approach of Scheutjens, Fleer, and Leermarkers. Equilibrium volume fractions profiles of micelles are obtained, and it appears that the surfactant head groups have a rather wide distribution. The boundary between the hydrocarbon core of the micelle and the solution is rather sharp and does not vary with salt concentration. An electrostatic potential develops, which causes accumulation of indifferent counterions in between the head groups and, consequently, leads to partial neutralization of the charges. The remaining net charge in the head group region is independent of the salt concentration. The calculated effects of chain length, salt concentration, and branching on the cmc and the aggregation numbers show a good agreement with experimental data. By use of lattices of different geometry, transitions from small spherical micelles to large rodlike aggregates can be predicted.

• OSTI ID: 7163583
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:23; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300 -- Petroleum-- Drilling & Production
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AQUEOUS SOLUTIONS
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DATA
DISPERSIONS
EQUILIBRIUM
EVALUATION
EXPERIMENTAL DATA
INFORMATION
IONS
MATHEMATICAL MODELS
MICELLAR SYSTEMS
MICROSTRUCTURE
MIXTURES
NUMERICAL DATA
RODS
SELF-CONSISTENT FIELD
SHAPE
SOLUTIONS
SPHERES
SURFACTANTS
THEORETICAL DATA