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The Pressure- and Temperature-Induced Wetting Transitions in the Binary Water Ethylene Glycol Monoisobutyl Ether Mixture.

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Bibliographic Details
Title: The Pressure- and Temperature-Induced Wetting Transitions in the Binary Water Ethylene Glycol Monoisobutyl Ether Mixture.
Authors: Chih-Kang Wu1, Li-Jen Chen1
Source: Journal of Physical Chemistry B. Jun2006, Vol. 110 Issue 24, p11907-11911. 5p.
Subjects: Surface chemistry, Surface tension, Ethylene glycol
Abstract: A homemade pendent drop/bubble tensiometer is applied to perform the surface/interfacial tension measurements for the binary water ethylene glycol monoisobutyl ether (iso-C4E1) mixture over the temperature range from 25 to 150 °C and over the pressure range up to 100 bar. The symbol CiEjis the abbreviation of a nonionic polyoxyethylene alcohol CiH2i1(OCH2CH2)jOH. The wetting behavior of the iso-C4E1-rich phase at the surface of the aqueous phase is systematically examined according to the wetting coefficient determined from the experimental results of surface/interfacial tensions. It is found that the iso-C4E1-rich phase exhibits a sequence of wetting transitions, nonwetting → partial wetting → complete wetting, at the water surface in the water iso-C4E1system along with increasing temperature. On the other hand, the iso-C4E1-rich phase undergoes a wetting transition from partial wetting to nonwetting at the surface of the aqueous phase by increasing the system pressure at a fixed temperature near the lower critical solution temperature (LCST) of the closed-loop miscibility gap in the water iso-C4E1system. [ABSTRACT FROM AUTHOR]
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Abstract:A homemade pendent drop/bubble tensiometer is applied to perform the surface/interfacial tension measurements for the binary water ethylene glycol monoisobutyl ether (iso-C4E1) mixture over the temperature range from 25 to 150 °C and over the pressure range up to 100 bar. The symbol CiEjis the abbreviation of a nonionic polyoxyethylene alcohol CiH2i1(OCH2CH2)jOH. The wetting behavior of the iso-C4E1-rich phase at the surface of the aqueous phase is systematically examined according to the wetting coefficient determined from the experimental results of surface/interfacial tensions. It is found that the iso-C4E1-rich phase exhibits a sequence of wetting transitions, nonwetting → partial wetting → complete wetting, at the water surface in the water iso-C4E1system along with increasing temperature. On the other hand, the iso-C4E1-rich phase undergoes a wetting transition from partial wetting to nonwetting at the surface of the aqueous phase by increasing the system pressure at a fixed temperature near the lower critical solution temperature (LCST) of the closed-loop miscibility gap in the water iso-C4E1system. [ABSTRACT FROM AUTHOR]
ISSN:15206106
DOI:10.1021/jp061093v