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arXiv 1803.10596cond-mat.stat-mechcond-mat.soft
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离子液体中L_2O_3的筛选

Screening Lengths in Ionic Fluids

Fabian Coupette, Alpha A. Lee, Andreas Härtel

摘要:

离子流体中相关性的衰减是软物质物理学中的一个经典问题,它支持从控制胶体自组装到电池和超级电容器的应用。传统的智慧,基于分析无溶剂电解质模型,表明物种之间的所有关联函数在渐近远场极限中以共同的衰减长度衰减。尽管如此,溶剂存在于许多电解质系统中。我们表明,使用分析理论和分子动力学模拟,多个衰变长度可以共存的渐近极限,以及在中间距离,一旦被认为是硬球溶剂。我们的分析提供了一个解释,最近观察到的结构力的不连续变化的离子液体-溶剂混合物的薄膜的组成是不同的,以及重新架构最近的争论在文献中的屏蔽长度在浓缩电解质。

英文摘要:

The decay of correlations in ionic fluids is a classical problem in soft matter physics that underpins applications ranging from controlling colloidal self-assembly to batteries and supercapacitors. The conventional wisdom, based on analyzing a solvent-free electrolyte model, suggests that all correlation functions between species decay with a common decay length in the asymptotic far field limit. Nonetheless, a solvent is present in many electrolyte systems. We show using an analytical theory and molecular dynamics simulations that multiple decay lengths can coexist in the asymptotic limit as well as at intermediate distances once a hard sphere solvent is considered. Our analysis provides an explanation for the recently observed discontinuous change in the structural force across a thin film of ionic liquid-solvent mixtures as the composition is varied, as well as reframes recent debates in the literature about the screening length in concentrated electrolytes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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