Ternary water-in-oil microemulsions made of cationic surfactants, water, and aromatic solvents. 3. Self-diffusion studies in relation to exchange of material between droplets and percolation

Journal Article · Thu Apr 18 00:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100161a071· OSTI ID:5681088

Zana, R; Lang, J ^[1]; Canet, D ^[2]

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1. Centre National de la Recherche Scientifique, Strasbourg (France)
2. Univ. de Nancy, Vandoeuvre-les-Nancy (France)

Ternary water-in-oil microemulsions using alkylbenzyldimethylammonium chloride (alkyl = dodecyl (N12), tetradecyl (N14), and hexadecyl (N16)) surfactants and benzene or chlorobenzene as oils have been investigated by means of electrical conductivity and NMR self-diffusion. The variations of the water self-diffusion coefficient with the (water)/(surfactant) molar concentration ratio {omega} and with the volume fraction of benzene in the oil mixture in water/(benzene + chlorobenzene)/N16 microemulsions are well correlated with the changes of electrical conductivity, as expected from a model of microemulsions where the water cores of the droplets become increasingly connected above the percolation threshold. These connections, however, have a strongly dynamic character. This model permits the authors to explain the widely differing magnitudes of the changes of electrical conductivity, water self-diffusion coefficient, and rate of exchange reactants between droplets upon increasing {omega}. The self-diffusion coefficient of the oil has been found to be about half that of the bulk oil, as in studies reported by others.

• OSTI ID: 5681088
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 95:8; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
MICROEMULSIONS
SELF-DIFFUSION
BENZENE
CATIONS
DROPLETS
ELECTRIC CONDUCTIVITY
HALOGENATED AROMATIC HYDROCARBONS
NUCLEAR MAGNETIC RESONANCE
QUANTITY RATIO
SOLVENTS
SURFACTANTS
WATER
AROMATICS
CHARGED PARTICLES
COLLOIDS
DIFFUSION
DISPERSIONS
ELECTRICAL PROPERTIES
EMULSIONS
HYDROCARBONS
HYDROGEN COMPOUNDS
IONS
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
PARTICLES
PHYSICAL PROPERTIES
RESONANCE
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