Aggregation Behavior of Long-Chain Piperidinium Ionic Liquids in Ethylammonium Nitrate
作者:Caili Dai、Mingyong Du、Yifei Liu、Shilu Wang、Jianhui Zhao、Ang Chen、Dongxu Peng、Mingwei Zhao
DOI:10.3390/molecules191220157
日期:——
Micelles formed by the long-chain piperidinium ionic liquids (ILs) N-alkyl-N-methylpiperidinium bromide of general formula CnPDB (n = 12, 14, 16) in ethylammonium nitrate (EAN) were investigated through surface tension and dissipative particle dynamics (DPD) simulations. Through surface tension measurements, the critical micelle concentration (cmc), the effectiveness of surface tension reduction (Πcmc), the maximum excess surface concentration (Гmax) and the minimum area occupied per surfactant molecule (Amin) can be obtained. A series of thermodynamic parameters (DG0 m, DH0 m and DS0 m) of micellization can be calculated and the results showed that the micellization was entropy-driven. In addition, the DPD simulation was performed to simulate the whole aggregation process behavior to better reveal the micelle formation process.
通过表面张力和耗散粒子动力学(DPD)模拟研究了在硝酸乙铵(EAN)中由长链哌啶铵离子液体(ILs)N-烷基-N-甲基哌啶溴化物(一般式CnPDB,n = 12, 14, 16)形成的胶束。通过表面张力测量,可以获得临界胶束浓度(cmc)、表面张力降低效果(Πcmc)、最大过剩表面浓度(Гmax)以及每个表面活性剂分子所占的最小面积(Amin)。计算了一系列胶束化的热力学参数(DG0m, DH0m和DS0m),结果显示胶束化是由熵驱动的。此外,进行了DPD模拟,以模拟整个聚集过程行为,更好地揭示胶束形成过程。