arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2002.08613cond-mat.mtrl-sci
收藏

约束下的离子液体:从离子和孔径的系统变化到复杂多孔碳的结构和动力学的理解

Ionic liquids under confinement: From systematic variations of the ion and pore sizes towards an understanding of structure and dynamics in complex porous carbons

El Hassane Lahrar, Anouar Belhboub, Patrice Simon, Céline Merlet

摘要:

我们使用分子模拟的离子液体与一系列的纳米多孔碳接触,研究离子大小,孔径,孔拓扑结构和吸附的离子的属性之间的相关性。我们发现,扩散系数增加的阴离子的大小,令人惊讶的是,与吸附的离子的量。这两个发现被解释的限制:当在孔人口增加额外的离子位于限制较少的网站和扩散速度更快。在保持拓扑结构不变的同时扩大孔隙的模拟安慰了这些观察结果。跨结构的属性解释更具挑战性。一个有趣的观点是,较小的孔隙不一定导致较大的限制。在这项工作中,最高程度的约束观察到中等孔径。我们还显示了吸附的离子的量和最大孔径和孔限制直径之间的比率之间的相关性。

英文摘要:

We use molecular simulations of an ionic liquid in contact with a range of nanoporous carbons to investigate correlations between ion size, pore size, pore topology and properties of the adsorbed ions. We show that diffusion coefficients increase with the anion size and, surprisingly, with the quantity of adsorbed ions. Both findings are interpreted in terms of confinement: when the in-pore population increases additional ions are located in less confined sites and diffuse faster. Simulations in which the pores are enlarged while keeping the topology constant comfort these observations. The interpretation of properties across structures is more challenging. An interesting point is that smaller pores do not necessarily lead to larger confinement. In this work, the highest degrees of confinements are observed for intermediate pore sizes. We also show a correlation between the quantity of adsorbed ions and the ratio between the maximum pore diameter and the pore limiting diameter.

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。

↑