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arXiv 1808.01396cond-mat.soft
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离子液体向离子液晶的逾渗相变

Percolation Phase Transition from Ionic Liquids to Ionic Liquid Crystals

Shen Li, Yanting Wang

摘要:

离子液体是典型的复杂液体,其相态的变化超出了简单液体理论的描述。特别地,具有中间阳离子侧链长度,IL可以形成纳米级分离的液体(NSL)相,当侧链足够长时,其最终将转化为离子液晶(ILC)相。然而,这种转变的微观机制尚不清楚。在这项工作中,通过粗粒分子动力学模拟,我们表明,随着阳离子侧链长度的增加,一些局部片的非极性域逐渐形成的侧链平行排列在NSL相内,然后发生突然的渗流相变时,该系统转变为ILC相,表明这是一个临界现象。渗流相变被应用到离子液体,提供了新的见解,许多最近的观察无论是在实验和模拟。

英文摘要:

As typical complex liquids, ionic liquids (ILs) exhibit phases beyond the description of simple liquid theories. In particular, with an intermediate cationic side-chain length, ILs can form the nanoscale segregated liquid (NSL) phase, which will eventually transform into the ionic liquid crystal (ILC) phase when the side chains are adequately long. However, the microscopic mechanism of this transformation is still unclear. In this work, by means of coarse-grained molecular dynamics simulation, we show that, with increasing cationic side-chain length, some local pieces of non-polar domains are gradually formed by side chains aligned in parallel inside the NSL phase, before an abrupt percolation phase transition happens when the system transforms into the ILC phase, manifesting that it is a critical phenomenon. Percolation phase transition is applied to ILs, providing new insights into many recent observations both in experiments and simulations.

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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