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arXiv 1503.01879cond-mat.softcond-mat.stat-mechphysics.chem-ph
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稠密离子流体的静态介电性质

Static dielectric properties of dense ionic fluids

Grigory Zarubin, Markus Bier

摘要:

致密离子流体的静态介电性质,例如,室温离子液体(RTIL)和无机熔盐在不同的长度尺度上进行了巨正则蒙特卡罗模拟研究。一个普遍适用的计划,它允许一个近似地分解成取向和扭曲极化贡献的致密离子流体的电极化率。结果表明,在长距离的著名的等离子体般的完美的屏蔽行为发生,这对应于一个发散的畸变磁化率,而在短距离取向极化占主导地位,这与附着的阳离子-阴离子对的偶极流体相一致。这一观察结果表明,最近争论的解释RTIL稀释电解质溶液可能不是一个简单的是-否的问题,但它可能取决于考虑的长度尺度。

英文摘要:

The static dielectric properties of dense ionic fluids, e.g., room temperature ionic liquids (RTILs) and inorganic fused salts, are investigated on different length scales by means of grandcanonical Monte Carlo simulations. A generally applicable scheme is developed which allows one to approximately decompose the electric susceptibility of dense ionic fluids into the orientation and the distortion polarization contribution. It is shown that at long range the well-known plasma-like perfect screening behavior occurs, which corresponds to a diverging distortion susceptibility, whereas at short range orientation polarization dominates, which coincides with that of a dipolar fluid of attached cation-anion pairs. This observation suggests that the recently debated interpretation of RTILs as dilute electrolyte solutions might not be simply a yes-no-question but it might depend on the considered length scale.

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