Density-functional modeling of structure and forces in thin micellar liquid films

Journal Article · Sat Oct 15 04:00:00 EDT 1994 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.468325· OSTI ID:7005282

Pollard, M L; Radke, C J ^[1]

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1. Earth Sciences Division, Lawrence Berkeley Laboratory and Department of Chemical Engineering, University of California, Berkeley, Berkeley, California 94720 (United States)

Repulsive (positive) disjoining pressures result from layer separations less than the corresponding bulk value whereas attractive (negative) regions represent more distance between layers than that in the bulk. The 0.2 M SDS disjoining pressure isotherm exhibits one additional layer than the 0.1 M case for thicknesses up to 50 nm. The pressure magnitudes of the former case are about twice that of the latter. Addition of ionic salts greatly inhibits the long-range micellar structuring. For SDS foam films, predicted disjoining pressures are much higher than measured values. Comparison with cetyltrimethyl-ammonium bromide (CTAB) micellar films in the surface forces apparatus, however, shows near quantitative agreement. The nature of the confining interfaces thus plays a key role in supporting the internal micellar structuring.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7005282
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 101:8; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AQUEOUS SOLUTIONS
DENSITY
DIMENSIONS
DISPERSIONS
DISTRIBUTION
EQUILIBRIUM
FILMS
MIXTURES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SOLUTIONS
STRUCTURE FACTORS
SURFACTANTS
THICKNESS
THIN FILMS