Translational diffusion and solution structure of microemulsions
For isotopic solution phases in surfactant systems which contain large amounts of water and hydrocarbon, the self-diffusion coefficients were determined for several components to obtain information on solution structure. Phases studied were one surfactant phase in a nonionic surfactant system and one microemulsion phase in an ionic surfactant + cosurfacant system. The systems chosen were tetraethyleneglycol dodecyl ether-exadecane-water and sodium octylbenzenesulfonate-pentanol decane-sodium chloride-water. The experimental techniques used were the open-ended capillary tube method using radioactive labeling and the NMR (H/sub 1/ and H/sub 2/ NMR) spin-echo pulsed-field gradient method. Over wide composition ranges in both systems both hydrocarbon and water (+ counterion) diffusion is rapid over macroscopic distances demonstrating that the solutions are both hydrocarbon and water continuous. The results do not show areas with oil-in-water and water-in-oil microemulsions with a sharp transition between the 2 types of aggregates.
- OSTI ID:
- 6229875
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:19; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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ALCOHOLS
ALKALI METAL COMPOUNDS
ALKANES
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DECANE
DIFFUSION
DISPERSIONS
EMULSIONS
ENHANCED RECOVERY
ETHERS
FLUID INJECTION
HALIDES
HALOGEN COMPOUNDS
HEXADECANE
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MICROEMULSIONS
MIXTURES
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PENTANOLS
PHASE STUDIES
POLYMERS
RECOVERY
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
SURFACTANTS
WATER
WATERFLOODING