Phase Behavior and Microemulsion Formation in Compressible Perfluorinated Monomer Oil and Water Mixtures

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• 作者：Anka N. Dobreva-Veleva ; Eric W. Kaler ; Kai-Volker Schubert ; Andrew E. Feiring ; and William B. Farnham
• 刊名：Langmuir
• 出版年：1999
• 出版时间：June 22, 1999
• 年：1999
• 卷：15
• 期：13
• 页码：4480 - 4485
• 全文大小：89K
• 年卷期：v.15,no.13(June 22, 1999)
• ISSN：1520-5827

文摘

The phase behavior of mixtures of water, hexafluoropropylene (HFP), ammonium perfluorooctanoate(C8), fluorinated alcohol, and ammonium chloride is reported as a function of temperature, pressure,electrolyte concentration, and hydrophobicity of the surfactant blend. The addition of a short-chain alcohol,hexafluoro-2-methyl-2-propanol, to the water-HFP-C8 mixture promotes formation of microemulsionphases. Replacing the weak amphiphile with a medium-chain alcohol, for example, 2-perfluorobutyl-2-propanol or 2-perfluorohexyl-2-propanol, produces large liquid crystalline regions. Microemulsionformulations containing the fluorinated olefin in a near-critical state along with water, fluorinated surfactant,fluorinated alcohol, and salt follow the generic patterns of phase behavior common for conventional liquidmixtures as a function of experimental variables. Pressure has a strong effect on the phase behavior whenone of the components is compressible.