Physicochemical Studies on Microemulsions: V. Additive Effects on the Performance of Scaling Equations and Activation Energy for Percolation of Conductance of Water/AOT/Heptane Microemulsion
✍ Scribed by Saroj Ray; Subinoy Paul; Satya P. Moulik
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 147 KB
- Volume
- 183
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
percolation'' and justify the mechanism behind it but a defi-Both water-induced and temperature-induced percolation of nite conclusion in this regard is still awaited. We have recently water/AOT/heptane water-in-oil microemulsion have been studstudied (19) the effects of various additives on the process of ied in detail in the presence of a good number of additives alone percolation and have suggested (18) in favor of ''transient and in combination. The additives have shown both assisting and fusion and mass exchange mechanism'' rather than the ''hopresisting effects on the process. The hydroxy bile salts distinctly ping mechanism.'' Under the same conditions, long chain alkafall in the former category while tetraethyl ammonium iodide, nols (greater than butanol) increase the threshold temperature benzene, toluene, napthalene, xylene, and cholesterol constitute (20), and the phenomenon is only marginal when xylene and the latter. The nonpercolating system water/AOT/xylene can be toluene are used as oils instead of aliphatic hydrocarbons. Other made percolating by the addition of 0.5 mol dm 03 sodium cholate.
The scaling laws for both kinds of percolation have been found to additives have specific roles in the process. The activation be obeyed but the equation parameters differ in magnitude from energies for conduction before, during, and after percolation what theory predicts. The additives have a distinct contribution can also be interesting and instructive (18, 20). The additives, in this regard. The activation energy required for the percolation viz., salts, cholesterol, and crown ether, can have distinct effects process has been determined; the values realized in different addion percolation (18).
tive environments do not follow a general trend. ᭧ 1996 Academic
In this presentation, the results of investigation mainly on Press, Inc.
the effects of the bile salt sodium cholate (NaC), tetraethyl-