Electric percolation of water-in-oil microemulsions: The application of effective medium theory to system sodium dodecylbenzenesulfonate (DDBS)/n-pentanol/n-heptane/water
Journal Article
·
· Journal of Colloid and Interface Science
- Peking Univ., Beijing (China). Technical Physics Dept.
The electric conductive behavior of the system water/sodium dodecylbenzenesulfonate (DDBS)/n-pentanol/n-heptane has been studied. The results showed that the system has an intrinsic electric percolation phenomenon. The water induced percolation threshold, {phi}{sub d}{sup p}, varies over a wide range and is higher than the theoretically predicted value of below 1/3. To use the changed form of the effective medium theory, a second-order polynomial relationship between {sigma}{phi}{sub d} and the conductivity {sigma} of system, is much better than to use the plot of {sigma} versus {phi}{sub d} in fitting the conductivity data of W/O microemulsion, where {phi}{sub d} is the volume fraction of the disperse phase. A linear equation exists when the volume fraction {phi}{sub d} of the disperse phase does not exceed percolation threshold {phi}{sub d}{sup p} much more. The content P of n-pentanol and DDBS affects the properties of the system significantly, but the influences on the limit conductivity of the disperse phase and that of the continuous phase are in the same tendency; also the distribution of alcohol among inner water core, surfactant shell, and continuous phase are changed.
- OSTI ID:
- 228011
- Journal Information:
- Journal of Colloid and Interface Science, Journal Name: Journal of Colloid and Interface Science Journal Issue: 1 Vol. 178; ISSN 0021-9797; ISSN JCISA5
- Country of Publication:
- United States
- Language:
- English
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