A comprehensive study the effect of acetonitrile (ACN) with four cationic surfactants, viz. tetradecyltrimethylammonium bromide (TTAB), cetyltrimethylammonium bromide (CTAB), cetylpyridinium chloride (CPC) and cetylpyridinium bromide (CPB) was made by using the conductivity, surface tension, fluorescence and FTIR techniques. Significant micellar, interfacial and thermodynamic properties were studied by the tensiometeric and conductivity methods. The critical micelle concentration (CMC), aggregation number ( N agg ), and Stern–Volmer constants ( K sv ) have also been studied by the steady state fluorescence method using pyrene as probe. The fluorescence study also supports the CMC results obtained from conductivity and surface tension. FTIR was used to ascertain that the strength of intermolecular interactions such as hydrogen bonding, ion–ion pair interactions and induced dipole interactions between the surfactants and ACN depend upon the head-group of the surfactants. The interaction of surfactants with ACN is energetically favorable and occurs via direct interactions between the surfactants and ACN. The results further revealed that the strength of interactions between the surfactants and ACN follows the order: TTAB > CTAB > CPC > CPB.

中文翻译：

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乙腈对常规阳离子表面活性剂胶体行为的影响：综合电导率、表面张力、荧光和 FTIR 研究

乙腈 (ACN) 与四种阳离子表面活性剂的综合研究，即。利用电导率、表面张力、荧光和FTIR技术制备了十四烷基三甲基溴化铵（TTAB）、十六烷基三甲基溴化铵（CTAB）、十六烷基氯化吡啶鎓（CPC）和十六烷基溴化吡啶鎓（CPB）。通过张力计和电导率方法研究了显着的胶束、界面和热力学性质。临界胶束浓度 (CMC)、聚集数 (N agg ) 和 Stern-Volmer 常数 (K sv ) 也已通过使用芘作为探针的稳态荧光方法进行了研究。荧光研究还支持从电导率和表面张力获得的 CMC 结果。FTIR 用于确定分子间相互作用的强度，如氢键、表面活性剂和 ACN 之间的离子-离子对相互作用和诱导偶极相互作用取决于表面活性剂的头基。表面活性剂与 ACN 的相互作用在能量上是有利的，并且通过表面活性剂和 ACN 之间的直接相互作用发生。结果进一步表明，表面活性剂与乙腈之间的相互作用强度顺序为：TTAB>CTAB>CPC>CPB。