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Dynamic Behavior Study in Systems Containing Nonpolar Hydrocarbon Oil and C12E5 Nonionic Surfactant  

Bae, Min Jung (Department of Chemical and Biochemical Engineering, Dongguk University)
Lim, Jong Choo (Department of Chemical and Biochemical Engineering, Dongguk University)
Publication Information
Korean Chemical Engineering Research / v.47, no.1, 2009 , pp. 46-53 More about this Journal
Abstract
Phase equilibrium and dynamic behavior studies were performed in systems containing $C_{12}E_5$ nonionic surfactant solution and nonpolar hydrocarbon oil. The phase behavior result showed an oil-in-water(O/W) microemulsion(${\mu}E$) in equilibrium with excess oil phase at low temperatures and a water-in-oil(W/O) ${\mu}E$ in equilibrium with excess water phase at high temperatures. For intermediate temperatures a 3 phase region containing excess water, excess oil, and a middle-phase microemulsion was observed and the transition temperature was found to increase with an increase in the chain length of a hydrocarbon oil. Dynamic behavior at low temperatures showed that an oil drop size decreased linearly with time due to solubilization into micelles and the solubilization rate decreased with an increase in the chain length of a hydrocarbon oil. On the other hand, both spontaneous emulsification of water into oil phase and expansion of oil drop with time were observed because of diffusion of surfactant and water into oil phase. Under conditions of a 3 phase region including a middle-phase ${\mu}E$, both rapid solubilization and emulsification of oil into aqueous surfactant solution were found mainly due to the existence of ultra-low interfacial tension. Interfacial tensions were measured as a function of time for n-decane oil drops brought into contact with 1 wt% surfactant solution at $25^{\circ}C$. Both equilibrium interfacial tension and equilibration time were found to increase with an increase in the chain length of a hydrocarbon oil.
Keywords
Dynamic Behavior; $C_{12}E_5$ Nonionic Surfactant; Nonpolar Oil; Solubilization; Spontaneous Emulsification;
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Times Cited By KSCI : 5  (Citation Analysis)
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