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Synthesis and Characterization of Interfacial Properties of a Cationic Surfactant Having Three Hydroxyl Groups  

Lee, Byung Min (Environment & Resources Research Center, Green Chemistry Division, KRICT)
Kim, Ji-Hyun (Environment & Resources Research Center, Green Chemistry Division, KRICT)
Kim, Sung Soo (NanoBio Fusion Research Center, Advanced Materials Division, KRICT)
Lim, Jong Choo (Department of Chemical and Biochemical Engineering, Dongguk University-Seoul)
Publication Information
Applied Chemistry for Engineering / v.23, no.5, 2012 , pp. 433-439 More about this Journal
Abstract
In this study, a cationic surfactant BHMAS (N,N-bis-(3'-n-dodecyloxy-2'-hydroxypropyl)-N-methyl-2-hydroxyethylammonium methyl sulfate) having two lauryl and three hydroxyl groups was synthesized by the reaction of n-dodecyl glycidyl ether and 2-aminoethanol followed by the quarternization with dimethyl sulfate. The structure of the product was elucidated by $^{1}H-NMR$ and FT-IR. The CMC (critical micelle concentration) and surface tension of BHMAS at CMC condition were found to be $9.12\;{\times}\;10^{-4}$ mol/L and 28.71 mN/m respectively. Dynamic surface tension measurements using a maximum bubble pressure tensiometer indicated that a relatively long time was required to saturate the interface between air and aqueous surfactant solution. The interfacial tension measured between 1 wt% surfactant solution and n-decane reached an equilibrium value of 0.045 mN/m in 5 min. The adsorption capacity of the synthesized surfactant was observed to be excellent, which suggests that the surfactant can be used as a softening agent during a laundry process.
Keywords
cationic surfactant; hydroxyl group; solubility; surface tension; interfacial tension;
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