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Measurement of Isoelectric Point of Betaine Zwitterionic Surfactant by QCM(Quartz Crystal Microbalance)  

Kim, Ji Sung (Department of Chemical and Biochemical Engineering, Dongguk University)
Park, Jun Seok (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. 31-37 More about this Journal
Abstract
A zwitterionic surfactant shows not only detergency but also mildness effect since it shows characteristics of a nonionic or an anionic surfactant above an isoelectric point, while showing characteristics of a cationic surfactant below an isoelectric point. Therefore, a zwitterionic surfactant can serve as a dual function surfactant by a single molecule through the interconversion of cleaning and softening effects depending on pH variations of the aqueous solution. In this study, physical properties of betaine surfactant such as CMC, surface tension, interfacial tension, contact angle and viscosity were measured and phase behavior study was performed. Also dual function characteristics of betaine zwitterionic surfactant were investigated by measuring an isoelectric point using QCM(quartz crystal microbalance) and zeta potential measurement. The CMC of betaine surfactant was near $10^{-4}mol/L$ and the surface tension at CMC was about 32 mN/m. The interfacial tension between 1 wt% aqueous solution and n-decane measured by spinning drop tensiometer at pH 2~10 resulted in an increase in interfacial tension until pH 5 and a decrease with pH after 5 and equilibration time showed the similar trend with an increase in pH. The isoelectric point of betaine surfactant measured by QCM experiment was found to exist between 3.0 and 3.3, which is the same as the result determined by zeta potential measurement.
Keywords
Zwitterionic Surfactant; Betaine; Isoelectric Point; Mildness; Cleaning;
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Times Cited By KSCI : 2  (Citation Analysis)
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