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http://dx.doi.org/10.9713/kcer.2012.50.3.455

Measurement of an Isoelectric Point and Softness of a EO-PO Adducted Zwitterionic Surfactant  

Lim, JongChoo (Department of Chemical and Biochemical Engineering, Dongguk University)
Mo, DaHee (Department of Chemical and Biochemical Engineering, Dongguk University)
Lee, JinSun (Department of Chemical and Biochemical Engineering, Dongguk University)
Park, JunSeok (Central Research Laboratories, Aekyung)
Han, DongSung (Central Research Laboratories, Aekyung)
Publication Information
Korean Chemical Engineering Research / v.50, no.3, 2012 , pp. 455-463 More about this Journal
Abstract
In this study, the measurement of physical properties of ethylene oxide-propylene oxide adducted zwitterionic surfactants were measured such as critical micelle concentration, surface tension, interfacial tension, contact angle, viscosity and foam stability. Also, the dual function characteristics of a zwitterionic surfactant were investigated by determining an isoelectric point, which were obtained using zeta potential measurement and QCM (quartz crystal microbalance) experiments. The isoelectric point of DEP-OSA82-AO zwitterionic surfactant determined by zeta potential measurement was close to that obtained by QCM experiment and both results have shown almost the same trend as that determined by the frictional property measured using an automated mildness tester. In particular, it has been observed that DEP32-OSA82-AO and DEP34-OSA82-AO surfactants provide better softening effect at a pH of acidic or neutral condition than at an alkaline condition. This result indicates that both surfactants act as a cationic surfactant at a pH of acidic or neutral condition and thus provide good softening effect during a rinsing cycle in the detergency process.
Keywords
EO-PO Adducted Zwitterionic Surfactant; Softness; Isoelectric Point; QCM (quartz crystal microbalance); Zeta Potential;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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