Abstract
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 (, and ) 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.
Highlights
Ionic liquids (ILs) are a class of organic salts that are liquids at or near room temperature
Our aim was to examine the influence of alkyl chain length on the aggregation behavior, so that we can offer a systematic study of the mechanism of formation of aggregations formed by surface active ionic liquids (ILs) in room-temperature ionic liquid (RTIL)
The value of cmc declines with the increase of hydrocarbon chain length, which is similar to their aggregation behavior in aqueous solution
Summary
Ionic liquids (ILs) are a class of organic salts that are liquids at or near room temperature They have attracted much attention because of their special properties, such as low volatility, nonflammability, high thermal stability and high ionic conductivity [1,2,3,4,5,6,7,8,9,10,11,12]. The anions may vary, for example, halides, PF6−, BF4−, (CF3SO3)2N− and CF3SO3−. These materials are widely used in organic synthesis, catalysis and preparation of nanostructured matters [16,17,18,19]. Numerous papers have reported the aggregation behavior of IL-type surfactants in aqueous solution [20,21,22,23,24,25,26]
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