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arXiv 1701.02520cond-mat.softnlin.AOphysics.chem-ph
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离子液体一级和二级相变的平均场方法

Mean field approach to first and second order phase transitions in ionic liquids

Sariel Bier, Nir Gavish, Hannes Uecker, Arik Yochelis

摘要:

离子液体是一种无溶剂电解质,其中一些具有有趣的自组装性质。使用平均场框架(基于Onsager的关系),我们表明,散装纳米结构出现通过I型和II型相变(PT),这直接影响双电层(EDL)结构。导出了Ginzburg-Landau方程,并将PT与温度、势和相互作用联系起来。I型PT发生几何上不同的阴离子/阳离子比,令人惊讶的是,是由扰动的顺序的热波动。最后,我们比较的见解与衰减的电荷层内的EDL,广泛观察到的实验。

英文摘要:

Ionic liquids are solvent-free electrolytes, some of which possess an intriguing self-assembly property. Using a mean-field framework (based on Onsager's relations) we show that bulk nano-structures arise via type-I and II phase transitions (PT), which directly affect the electrical double layer (EDL) structure. Ginzburg-Landau equation is derived and PT are related to temperature, potential and interactions. The type-I PT occurs for geometrically dissimilar anion/cation ratio and, surprisingly, is induced by perturbations on order of thermal fluctuations. Finally, we compare the insights with the decaying charge layers within the EDL, as widely observed in experiments.

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