Journal of Japan Oil Chemists' Society
Online ISSN : 1884-2003
ISSN-L : 0513-398X
Phase Behavior of Mixed Surfactant/Water/Oil Systems
Hironobu KUNIEDAKaoru IGARASHI
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JOURNAL FREE ACCESS

1982 Volume 31 Issue 11 Pages 949-952

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Abstract
Phase behavior of water-oil systems containing mixed nonionic surfactant or commercial surfactants, such as nonylphenylpoly (oxyethylene) ether, Tween 20 has been studied. In these systems, a three-phase region consisted of a water, a surfactant and an oil phases moves toward higher temperature with the decrease in a surfactant content. Accordingly, O/W-type emulsion can be inverted by not only the rise in temperature but increasing the surfactant content.
The effect of added ionic surfactant on the phase behavior of a nonionic surfactant/water/oil system has been also studied. The three-phase region moves toward higher temperature and diminishes by adding a small amount of ionic surfactant to a nonionic surfactant/water/oil system. Moreover, the solubilization of water and oil in a surfactant phase is abruptly increased.
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