Novel asymmetrical bis-surfactants with naphthalene and two amide groups: Synthesis, foamability and foam stability
作者:Yue Jia、Xiangfeng Guo、Lihua Jia、Zhenlong Zhao、Rui Yang、Yu Zhang、Hong Sun
DOI:10.1016/j.molliq.2021.115534
日期:2021.5
series of novel asymmetrical bis-surfactants (CnNCS, n = 10, 12, 14, 16), comprising a naphthalene group and a long chain hydrocarbon (as hydrophobic moieties), a quaternary ammonium group, one ether group and double amides (as hydrophilic moieties), and ethylidene as linkage groups, were designed, prepared, and characterized through proton and carbon nuclear magnetic resonance, Fourier-transform infrared
设计、制备了一系列新型不对称双表面活性剂(CnNCS, n = 10, 12, 14, 16),包括萘基团和长链烃类(作为疏水部分)、季铵基团、一个醚基和双酰胺(作为亲水部分)和乙烯基(作为键基团),并通过质子和碳核磁共振、傅里叶变换红外、 和电喷雾电离质谱分析。通过表面张力测量研究表面活性。CnNCS 表现出低临界胶束浓度 (0.708–0.004 mmol L-1) 和优异的表面张力降低能力。此外,在 C12NCS 中引入萘基和酰胺基可显著提高起泡性和泡沫稳定性。这主要归因于协作的非共价相互作用,例如长链碳氢化合物的疏水相互作用、萘基的π π堆叠、C12NCS 本身酰胺基团的氢键和 C12NCS 与水的氢键以及静电相互作用,这导致表面张力降低,导致 C12NCS 分子在空气-水界面处紧凑而致密地排列以形成紧密的薄膜。这两种功能都有助于形成泡沫,减慢液体从泡沫中排出,并防止气体通过单层扩