Structure and phase behavior in five-component microemulsions
- Univ. of Washington, Seattle (USA)
- Univ. of Delaware, Newark (USA)
Droplet-to-bicontinuous structure transitions in a family of five-component microemulsions formed with sodium 4-(1{prime}-heptylnonyl)benzenesulfonate, isobutyl alcohol, D{sub 2}O, sodium chloride, and alkanes with even carbon numbers from octane to hexadecane are probed by using small-angle neutron scattering, electrical conductivity, and NMR self-diffusion measurements. The phase behavior and structure of these microemulsions are intimately linked and depend on salinity and the chain length of the alkane. Both the range of salt concentration in which the three-phase region is observed and the range of microemulsion water volume fraction within the three-phase region decrease with decreasing alkane chain length. Further, the appearance of the three-phase region is preceded by droplet-to-bicontinuous transitions. Microemulsions not exhibiting three-phase regions become bicontinuous only when they contain equal amounts of oil and water. The coincidence of the so-called percolation thresholds as determined by using electrical conductivity and self-diffusion measurements shows that electrical conduction in a dispersion of water droplets occurs with the exchange of material between the droplets.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5406763
- Journal Information:
- Langmuir; (United States), Vol. 6:3; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
MICROEMULSIONS
PHASE STUDIES
STRUCTURAL CHEMICAL ANALYSIS
ALCOHOLS
ALKANES
ELECTRIC CONDUCTIVITY
NUCLEAR MAGNETIC RESONANCE
SMALL ANGLE SCATTERING
SODIUM CHLORIDES
SULFONATES
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COLLOIDS
DISPERSIONS
ELECTRICAL PROPERTIES
EMULSIONS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROXY COMPOUNDS
MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHYSICAL PROPERTIES
RESONANCE
SCATTERING
SODIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
020300 - Petroleum- Drilling & Production