THE PHYSICOCHEMICAL PROPERTIES OF A NONAQUEOUS MICROEMULSION - CYCLOHEXANE TRITON(R) X-100 DIMETHYLFORMAMIDE AT 40-DEGREES-C

The phase diagram of a nonaqueous microemulsion system containing cycl ohexane/Triton(R) X-100/DMF was determined at 40 degrees C. The one-ph ase microemulsion area increased in the presence of a cosurfactant. Ph ysical properties like viscosity, adiabatic compressibility specific c onductance, and contact angle are discussed at a surfactant concentrat ion of 15% to explain the microstructure. A cyclohexane/TX 100+ 1-prop anol/DMF system shows percolation, though not high, with ca. 0.15 mole fraction of DMF. Contact angle measurements of cyclohexane/TX 100/DMF at various cyclohexane/DMF ratios show a DMF continuous system. In th e presence of a cosurfactant, the contact angle values show a continuo us change indicating an 0/DMF to bicontinuous to DMF/0 structure. NaI does not introduce a three-phase liquid system.