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http://dx.doi.org/10.14478/ace.2011.22.1.037

Synthesis and Characterization of Interfacial Properties of Sorbitan Laurate Surfactant  

Lee, Seul (Dept. of Chemical and Biochemical Engineering, Dongguk University-Seoul)
Kim, ByeongJo (AK ChemTech Central Research Lab.)
Lee, JongGi (AK ChemTech Central Research Lab.)
Lim, JongChoo (Dept. of Chemical and Biochemical Engineering, Dongguk University-Seoul)
Publication Information
Applied Chemistry for Engineering / v.22, no.1, 2011 , pp. 37-44 More about this Journal
Abstract
The critical micelle concentration (CMC) of sorbitan laurate SP 20 surfactant in this paper was near $7.216{\times}10^{-4}mol/L$ and the surface tension at CMC was about 26.0 mN/m, which showed higher CMC and lower surface tension than those of octylphenol ethoxylate octylphenol ethoxylate (OPE) 10 surfactant. Dynamic surface tension measurement using a maximum bubble pressure tensiometer showed that the adsorption rate at the interface between air and surfactant solution was found to be slower with SP 20 surfactant, presumably due to a low mobility of SP 20 surfactant monomer. The contact angle of SP 20 surfactant solution was observed to decrease with an increase in surfactant concentration and showed a larger value than that of OPE 10 surfactant solution. Half-life time for foams generated with 1 wt% surfactant solution was also larger with SP 20 surfactant, which indicated higher foam stability with SP 20 surfactant. Dynamic behavior study reveals that the solubilization of n-decane oil was much lower with SP 20, which is in good agreement with experimental results of foam stability, contact angle and CMC. Dynamic interfacial tension measurement by a spinning drop tensiometer shows that interfacial tensions at equilibrium condition in both systems were almost the same but the time required to reach equilibrium was longer with SP 20.
Keywords
sorbitan laurate; nonionic surfactant; octyl phenol ethoxylate; interfacial property; phase behavior;
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Times Cited By KSCI : 9  (Citation Analysis)
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