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Micellization, surface activities and thermodynamics study of pyridinium-based ionic liquid surfactants in aqueous solution

机译：胶束化，表面活性和热力学研究水溶液中吡啶基离子液体表面活性剂的研究

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The micellization and surface activity properties of long-chain pyridinium ionic liquids n-alkyl-3-methylpyridinium bromide ([C(n)mpy][Br], n: the carbon numbers of hydrophobic tails, n = 12, 14, 16) in aqueous solution were systematically investigated through electronic conductivity measurement, surface tension, and ultraviolet-absorption spectra. The surface chemical parameters and thermodynamics parameters were obtained. The [C(n)mpy][Br] ionic liquids exhibit higher surface activities than conventional surfactants with corresponding alkyl chain lengths. The effects of inorganic salts (LiBr, NaBr, MgBr2), organic alcohols (C2H5OH, C3H7OH, C4H9OH, C5H11OH) and temperature on the critical micelle concentration (CMC) values of [C(n)mpy][Br] aqueous solutions were also investigated. The CMC values remarkably decreased with the addition of inorganic salts. The CMC values increased slightly in the presence of ethanol, but decreased gradually as the chain length of the alcohol increased. The CMC values assumed a trend of decreasing and then increasing with the increase of temperature. The calculation results of thermodynamic parameters show that both adsorption and micellization processes of [C(n)mpy][Br] are spontaneous; the enthalpy of [C(12)mpy][Br] is negative at 293.15 K and becomes negative with temperature increasing. For [C(14)mpy][Br] and [C(16)mpy][Br] this transition occurs at 288.15 K and the micellization process is entropy-driven in the investigated temperature range.
机译：长链吡啶离子液体N-烷基-3-甲基吡啶溴化吡啶鎓锭（[C（n）mpy] [Br]，N：疏水性尾部的碳数，N = 12,14,16）的胶束化和表面活性性能通过电子电导测量，表面张力和紫外线吸收光谱系统地研究水溶液。获得表面化学参数和热力学参数。 [C（n）mpy] [Br]离子液体表现出比具有相应烷基链长度的常规表面活性剂更高的表面活性。无机盐（LIBR，NaBr，MgBr2），有机醇（C2H5OH，C3H7OH，C4H9OH，C5H11）和温度对[C（n）mpy] [Br]水溶液的临界胶束浓度（CMC）值的影响调查。 CMC值随着无机盐的添加而显着降低。在乙醇存在下，CMC值略微增加，但随着醇的链长增加，逐渐降低。 CMC值假设随着温度的增加而降低的趋势，然后增加。热力学参数的计算结果表明[C（n）mpy] [br]的吸附和胶束化方法是自发的; [C（12）mpy] [Br]的焓在293.15k处为负，温度升高变为负。对于[C（14）mpy] [Br]和[C（16）mpy] [Br]该过渡发生在288.15k，并且胶束化过程在研究温度范围内是熵驱动的。

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    《RSC Advances》 |2019年第49期|共9页
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  • 正文语种 eng
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