Novel ionic liquid-type Gemini surfactants: Synthesis, surface property and antimicrobial activity
Novel ionic liquid-type Gemini surfactants: Synthesis, surface property and antimicrobial activity
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DOI：
10.1016/j.colsurfa.2011.12.014
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发表时间：
2012-02-05
影响因子：
5.2
通讯作者：
Li, Jinxing
中科院分区：
文献类型：
--
作者：
Li, Hongqi;Yu, Chaochao;Li, Jinxing
合成了一种新型季铵盐Gemini表面活性剂，并通过IR，H-1 NMR，C-13 NMR和质谱对其结构进行了表征。用表面张力法研究了Gemini表面活性剂的表面性质。获得了表面张力参数，包括表面过量浓度γ（cmc）、每个分子的表面积需求A（cmc）、表面张力降低效率pC（20）、表面张力降低效率γ（cmc）、临界胶束浓度、CMC和标准胶团化自由能Delta G（ads）（0）和Delta G（mic）（0）。结果表明，与相应的常规单链表面活性剂相比，这些新型Gemini表面活性剂具有更低的CMC值和更高的降低水表面张力的效率。这些双子表面活性剂的发泡性和泡沫稳定性随着间隔链长度的增加而降低。具有中等长度（C-12或C-14）烷基链的Gemini表面活性剂显示出最好的发泡性和最高的泡沫稳定性。一些双子表面活性剂对革兰氏阴性菌大肠杆菌表现出抗菌活性。(C)2011 Elsevier B. V.保留所有权利。
Novel quaternary ammonium Gemini surfactants, which turned out to be ionic liquids due to the intermolecular hydrogen bonding formed from hydroxyl groups in the spacers, were synthesized and characterized by IR, H-1 NMR, C-13 NMR and mass spectra. The surface properties of the Gemini surfactants were investigated by means of surface tension measurements. Surface tension parameters including surface excess concentration, Gamma(cmc), surface area demand per molecule, A(cmc), efficiency in surface tension reduction, pC(20), the effectiveness of surface tension reduction, gamma(cmc), critical micelle concentration, CMC, and standard free energy of micellization, Delta G(ads)(0) and Delta G(mic)(0) were obtained. The results indicated that compared with those of their corresponding conventional single-chain surfactant counterparts, these novel Gemini surfactants exhibited lower CMC values and greater efficiency in lowering the surface tension of water. The foamability and foam stability of these Gemini surfactants decreased with the increase in the length of the spacer chain. Gemini surfactants with alkyl chains of moderate length (C-12 Or C-14) showed the best foamability and the highest foam stability. Some of the Gemini surfactants exhibited antimicrobial activity against Gram-negative bacteria Escherichia coli. (C) 2011 Elsevier B.V. All rights reserved.