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Determination of critical micelle concentration of dendritic surfactant synthesized viaa selective ring-opening addition reaction

By Chih-Hsiung Hsu, Shi-Min Shau, Ru-Jong Jeng, Hsin-Cheng Chiu, Shenghong A. Dai, Eric D. Conte and Shing-Yi Suen

Abstract

An azetidine-2,4-dione was applied to synthesize dendrons with four carbons in the end ([G-0.5]-C4 and[G-1]-C4) via a selective ring-opening addition reaction, which was subsequently extended to obtain a dendriticsurfactant ([G-1]-C4 surfactant) by acidification. The dendronswere characterized by Fourier transforminfrared(FT-IR), 1H nuclear magnetic resonance (1H NMR), elemental analyzer (EA), and fast atom bombardment massspectrometry (FAB MS). The dendritic surfactant, with a cationic head and branched hydrophobic C4 tails, wasdissolved in 2 wt.% dimethyl sulfoxide (DMSO) aqueous solution for the determination of criticalmicelle concentration(CMC) by fluorescence and electrical conductivity measurements. The resulted CMC values were veryclose within measurements, ca. 0.013–0.05 mM. Transmission electron microscopy (TEM) and zeta potentialmeasurement also provided an evidence ofmicelle formation and shape. Moreover, anionic dyes were adsorbedonto the micelles successfully to confirm the positive charge of [G-1]-C4 surfactant

Topics: Dendron, Dendritic surfactant, Critical micelle concentration (CMC), Zeta potential
Year: 2014
DOI identifier: 10.1016/j.microc.2013.02.002
OAI identifier: oai:ir.lib.nchu.edu.tw:11455/84830
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