arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.04549cond-mat.soft
收藏

四面体、氢键与有心力水模型的密度异常。一项蒙特卡洛研究

Tetrahedrality, hydrogen bonding and the density anomaly of the central force water model. A Monte Carlo study

V. Ravnik, B. Hribar-Lee, O. Pizio, M. Luksic

摘要:

采用正则和巨正则统计系综下的Monte Carlo计算机模拟研究了中心力(CF 1)水模型的性质。该模型较好地再现了H $_2$ O分子的分子内结构。重点是氢键,四面体,$q$,和翻译,$τ$,序参量。一个充满活力的氢键的定义给出了更一致的结果相比,一个参数的距离标准的平均氢键数。在300 K时,得到的平均值为3.8。$q$和$τ$度量被用来阐明CF 1模型的类水异常行为。结构异常导致密度异常,模型的密度与实验$ρ(T)$趋势吻合得很好。探讨了该模型状态方程的化学势-密度投影。在足够低的温度下观察到汽液共存。

英文摘要:

Monte Carlo computer simulations in the canonical and grand canonical statistical ensemble were used to explore the properties of the central force (CF1) water model. The intramolecular structure of the H$_2$O molecule is well reproduced by the model. Emphasis was made on hydrogen bonding, and on the tehrahedral, $q$, and translational, $τ$, order parameters. An energetic definition of the hydrogen bond gives more consistent results for the average number of hydrogen bonds compared to the one-parameter distance criterion. At 300 K, an average value of 3.8 was obtained. The $q$ and $τ$ metrics were used to elucidate the water-like anomalous behaviour of the CF1 model. The structural anomalies lead to the density anomaly, with a good agreement of the model's density with the experimental $ρ(T)$ trends. The chemical potential-density projection of the model's equation of state was explored. Vapour-liquid coexistence was observed at sufficiently low temperatures.

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。

↑