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Studies on the phase behavior of CTAB/ butanol/cyclohexane/water system

Jianjun Lu

Abstract

The phase behavior in the quaternary system CTAB /butanol/cyclohexane/water has been studied at 40 ℃. Increasing δ at constant γ causes a phase inversion from an oil-in-water droplet microemulsion in contact with excess oil (2) to a water-in oil microemulsion in contact with excess water(2) via a middle-phase microemulsion in contact with excess oil and water(3). Pseudo-ternary phase diagram for CTAB/butanol/cyclohexane/water has also been prepared. The microemulsion structure(W/O?B.C.?O/W) has been determined by electrical conductivity method.The effects of microemulsion structrue and temperature on electrical conductivity were investigated.The results show that electrical conductivity in B.C. area is larger than that in O/W or W/O area;Electrical conductivity increases as CTAB content increases.

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Key concepts: Microemulsion, Cyclohexane, Conductivity, Phase diagram, Ternary numeral system, Ternary operation, Electrical resistivity and conductivity, Phase (matter)