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arXiv 0810.4405cond-mat.stat-mechcond-mat.dis-nn
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压缩接近硬球的流体会增加玻璃的脆性

Compressing nearly hard sphere fluids increases glass fragility

Ludovic Berthier, Thomas A. Witten

摘要:

我们使用分子动力学来研究在大体积分数,φ,低温,T,软排斥粒子的组件中发生的玻璃化转变。我们发现,在(φ,T)平面上的平衡动力学服从一种形式的动态标度在一个临界点附近在T=0和φ = φ_0,这应该对应于理想的玻璃化转变的硬球。该玻璃点,即“G点”,不同于非热干扰阈值。标度行为的一个显著结果是,当phi增加到超过phi_0时,在固定phi下的动力学从强玻璃的动力学平稳地过渡到非常脆弱的玻璃的动力学。脆性和各种物理性质之间的相关性进行了探讨。

英文摘要:

We use molecular dynamics to investigate the glass transition occurring at large volume fraction, phi, and low temperature, T, in assemblies of soft repulsive particles. We find that equilibrium dynamics in the (phi, T) plane obey a form of dynamic scaling in the proximity of a critical point at T=0 and phi=phi_0, which should correspond to the ideal glass transition of hard spheres. This glass point, `point G', is distinct from athermal jamming thresholds. A remarkable consequence of scaling behaviour is that the dynamics at fixed phi passes smoothly from that of a strong glass to that of a very fragile glass as phi increases beyond phi_0. Correlations between fragility and various physical properties are explored.

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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