The solubility of Dynol-604 (a surfactant) in supercritical (SC) CO2 and the phase behavior of the CO2/water/Dynol-604 system were studied at different temperatures and pressures. The results showed that the solubility of the surfactant in SC CO2 is high and one-phase water-in-CO2 microemulsions could be formed although Dynol-604 is a nonfluorous and nonsiloxane nonionic surfactant. The solvatochromic probe studies and the UV spectrum of lysozyme in the supercritical CO2/water/Dynol-604 system further proved the existence of a water domain in the supercritical CO2 microemulsions.

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The conductivities and viscosities of the room-temperature ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) + water + ethanol and [bmim][PF6] + water + acetone ternary mixtures were determined in the temperature range from 288.15 K to 308.15 K, and the mole fraction of the solvents in the mixtures was up to 0.48. The conductivities of the mixtures increased with increasing concentration of the solvents and temperature in the solvent concentration range studied. An increase in temperature or solvent concentration results in reduction in the viscosities of the mixtures.