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Abstract
Water in oil microemulsion (μE) systems comprising water/AOT ± alkanol (n-butanol to n-dodecanol)/cycloalkanone (cyclopentanone to cycloheptanone, CA5, CA6, and CA7) were physicochemically studied with respect to phase and conductance behaviors. In absence of alkanols, AOT produced large clear zone with the cycloalkanones, compared to linear alkanes. Clear zone was comprised of gel, viscous, and clear fluid. Alkanols increased the fluidity of μE while its clarity was reduced. A maximum two-phase region was observed for n-heptanol (also for formulations with n-octanol). Salts, which reduced the clarity of the μE, followed the order of effectivity: Na+ < Mg2+ < Al3+. A correlation between clarity and turbidity was found irrespective of molecular size of oil, cosurfactant and salt. The influence of water and temperature on the conductance behavior of W/O formulations was studied. The studied systems were found to be less conducting than those with linear alkanes. Energetics and other structural parameters of the studied systems were evaluated from conductance behavior and the use of scaling equations.
Financial assistance in the form of a research grant from the University Grants Commission (UGC), New Delhi, India is gratefully acknowledged. M. D. acknowledges the receipt of a research fellowship from the UGC. S. P. M. thanks INSA for an Honorary Scientist position during the tenure of which the work was performed. The authors gratefully acknowledge the laboratory and other facilities rendered by the Departments of Chemistry, Behala College, Kolkata, University of North Bengal, Darjeeling, and Jadavpur University, Kolkata.
Notes
a Correlation coefficient varied: For CA5: from 0.995 to 0.998; for CA6: from 0.993 to 0.999; for CA7: from 0.994 to 0.998.