Adsorption of fluorocarbon and hydrocarbon surfactants to air-water, hexane-water, and perfluorohexane-water interfaces. Relative affinities and fluorocarbon-hydrocarbon nonideality effects

Journal Article · Thu Jul 23 04:00:00 EDT 1981 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150615a032· OSTI ID:5541016

Mukerjee, P; Handa, T

Surface and interfacial tensions of dilute aqueous solutions of sodium perfluorobutyrate, sodium perfluorooctanoate, sodium perfluorodecanoate, sodium octyl sulfate, and sodium decyl sulfate at the air-water (a/w), hexane-water (h/w), and perfluorohexane-water (p-f-h/w) interfaces have been measured with the objective of determining the relative affinities for the interfaces at low degrees of adsorption. Up to approximately 2 dyn/cm the surface pressures were found to increase linearly with surfactant concentration (activity), in agreement with a thermodynamic model of adsorption. The free energies of adsorption, have been estimated by using the thermodynamic model. From these data the incremental changes in free energy of adsorption, ..delta.. free energy of adsorption values, on adding a-CH/sub 2/-group to the hydrocarbon chain and a-CF/sub 2/-group to the fluorocarbon chain have been calculated. The affinity of a hydrocarbon surfactant for the h/w interface is markedly higher than that for the a/w interface. A fluorocarbon surfactant at the p-f-h/w interface shows a much smaller increase in affinity as compared to the a/w interface. 31 references.

• OSTI ID: 5541016
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 85:15; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ADSORPTION
AIR
ALKALI METAL COMPOUNDS
ALKANES
DISPLACEMENT FLUIDS
ENERGY
FLUIDS
FREE ENERGY
GASES
HEXANE
HYDROCARBONS
HYDROGEN COMPOUNDS
INTERFACES
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
PARTICLE MODELS
PHYSICAL PROPERTIES
QUANTITY RATIO
SODIUM COMPOUNDS
SORPTION
STATISTICAL MODELS
SURFACE PROPERTIES
SURFACE TENSION
SURFACTANTS
THERMODYNAMIC MODEL
THERMODYNAMIC PROPERTIES
WATER