Synthesis of Novel Zwitterionic Heterogemini Surfactants Derived from Fatty Acid and Investigation of Their Behavior at the Air-Water Interface
作者:Erlei Yu、Xamxi Kamar Mamat、Yagang Zhang、Wumanjiang Eli
DOI:10.2174/1570178612666150629181035
日期:2015.8.26
A series of novel cationic–non-ionic heterogemini surfactants (Cn-1EC-s-Cm
where n and m represents the hydrocarbon chain length of fatty acid and aliphatic
amine, n=12, 14, 16, 18, m=12, 14, 16) were synthesized from fatty acid,
epichlorohydrin and aldciphatic amine. The chemicals tructures of the surfactants were characterized by IR spectra, NMR,
ESI-MS and elemental analysis. Their critical micelle concentrations (CMC) in the aqueous solutions were determined by
surface-tension at 25°C.Relationship between γcmc and hydrophobic chain length was established which showed a large increase
upon increasing of chain length with ester. The surface-tension measurements ofCn-1EC-s-Cm showed a low CMC,
which greatly improve the efficiency in lowering the surface tension. Furthermore, adsorption and micellization behavior
of Cn-1EC-s-Cm were investigated by measuring minimum average area per surfactant molecule and standard free energy.
以脂肪酸、环氧氯丙烷和脂肪胺为原料合成了一系列新型阳离子-非离子异构表面活性剂(Cn-1EC-s-Cm,其中 n 和 m 分别代表脂肪酸和脂肪胺的烃链长度,n=12、14、16、18,m=12、14、16)。通过红外光谱、核磁共振、ESI-MS 和元素分析对表面活性剂的化学结构进行了表征。γcmc与疏水链长度之间的关系已经确定,这表明随着酯链长度的增加,γcmc会大幅增加。Cn-1EC-s-Cm的表面张力测量结果表明,其CMC较低,大大提高了降低表面张力的效率。此外,通过测量每个表面活性剂分子的最小平均面积和标准自由能,研究了 Cn-1EC-s-Cm 的吸附和胶束化行为。