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arXiv 1209.4529cond-mat.soft
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水在石墨表面润湿行为的蒙特卡罗模拟研究

A Monte Carlo simulation study on the wetting behavior of water on graphite surface

Xiongce Zhao

摘要:

本文是作者几年前发表的关于水在石墨上润湿转变模拟的快速通信(Phys. Rev. B,v76,041402(R),2007)的扩展版,旨在提供有关方法,参数和研究结果的更多细节,可能会引起某些读者的兴趣。基于SPC/E对水的经验势、10-4-3 van der Waals模型以及最近发展的水和石墨的诱导势和多极势,采用巨正则蒙特卡罗模拟结合多重直方图重加权计算了水在石墨上的吸附等温线。结果表明,水在石墨表面的润湿转变发生在475-480 K,预润湿临界温度在505-510 K之间。计算的润湿转变温度同意定量与先前预测的值,使用一个简单的模型。在润湿转变温度和预润湿临界温度之间的温度下观察到稳定和亚稳态共存,表明该转变是一级的。

英文摘要:

This paper is an expanded edition of the rapid communication published several years ago by the author (Phys. Rev. B, v76, 041402(R), 2007) on the simulation of wetting transition of water on graphite, aiming to provide more details on the methodology, parameters, and results of the study which might be of interest to certain readers. We calculate adsorption isotherms of water on graphite using grand canonical Monte Carlo simulations combined with multiple histogram reweighting, based on the empirical potentials of SPC/E for water, the 10-4-3 van der Waals model, and a recently developed induction and multipolar potential for water and graphite. Our results show that wetting transition of water on graphite occurs at 475-480 K, and the prewetting critical temperature lies in the range of 505-510 K. The calculated wetting transition temperature agrees quantitatively with a previously predicted value using a simple model. The observation of the coexistence of stable and metastable states at temperatures between the wetting transition temperature and prewetting critical temperature indicates that the transition is first order.

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