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arXiv 1408.4489cond-mat.softcond-mat.mes-hall
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柔性纳米孔中反常流体的高压诱导相变和超扩散

High pressure induced phase transition and superdiffusion in anomalous fluid confined in flexible nanopores

José Rafael Bordin, Leandro B. Krott, Marcia C. B. Barbosa

摘要:

利用分子动力学模拟研究了高压下受限球对称反常流体的行为。流体模拟的矿石软化势与两个特征的长度尺度,在批量再现的动力学,物理和结构的异常行为观察到的水和其他异常流体。我们的研究结果表明,该系统具有足够的高压和低温的超扩散制度。同时,我们的研究结果表明,这种超扩散机制与流体的结构性质密切相关,超扩散到扩散的转变是一级相变。我们展示了如何模拟时间和统计是重要的,以获得正确的动力学行为的封闭流体。我们的结果进行了讨论的基础上的两个长度尺度。

英文摘要:

The behavior of a confined spherical symmetric anomalous fluid under high external pressure was studied with Molecular Dynamics simulations. The fluid is modeled by a ore-softened potential with two characteristic length scales, which in bulk reproduces the dynamical, thermodynamical and structural anomalous behavior observed for water and other anomalous fluids. Our findings show that this system has a superdiffusion regime for sufficient high pressure and low temperature. As well, our results indicate hat this superdiffusive regime is strongly related with the fluid structural properties and the superdiffusion to diffusion transition is a first order phase transition. We show how the simulation time and statistics are important to obtain the correct dynamical behavior of the confined fluid. Our results are discussed in the basis of the two length scales.

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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