arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.4947cond-mat.mtrl-sci
收藏

简单单原子系统的液固临界点

A liquid-solid critical point in a simple monatomic system

Måns Elenius, Mikhail Dzugutov

摘要:

人们普遍认为,分离液体和固体的过渡线不能被临界点中断。这种观点是基于传统的对称性论点,即各向同性液体不能连续地转化为具有离散的旋转和平移对称性的晶体。我们在这里提出了一个分子动力学模拟的一个简单的单原子系统,演示了一个液-固旋节线终止于一个临界点。我们表明,在临界区,各向同性液体连续转变成一个相的介观秩序类似的近晶相液晶。我们认为,可以解释的中间相和晶体之间的紧密结构接近的存在下的调幅和临界点。这表明在胶凝胶体、液晶和聚合物中发现类似热力学行为的可能性。

英文摘要:

It is commonly believed that the transition line separating a liquid and a solid cannot be interrupted by a critical point. This opinion is based on the traditional symmetry argument that an isotropic liquid cannot be continuously transformed into a crystal with a discrete rotational and translational symmetry. We present here a molecular-dynamics simulation of a simple monatomic system that demonstrates a liquid-solid spinodal terminating at a critical point. We show that, in the critical region, the isotropic liquid continuously transforms into a phase with a mesoscopic order similar to that of the smectic liquid crystals. We argue that the existence of both the spinodal and the critical point can be explained by the close structural proximity between the mesophase and the crystal. This indicates a possibility of finding a similar thermodynamic behaviour in gelating colloids, liquid crystals and polymers.

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。

↑