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arXiv 1206.6955cond-mat.soft
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高压缩下软玻璃形成体动力学的非单调压力依赖性

Non-monotonic pressure dependence of the dynamics of soft glass-formers at high compressions

Lijin Wang, Yiheng Duan, Ning Xu

摘要:

在分子动力学模拟软玻璃形成者通过排斥相互作用,我们发现,玻璃化转变温度,动力学不均匀性,玻璃脆性达到最大值在相同的交叉压力$P_d$。我们对零温堵塞态的分析表明,在$P_d$的态具有最高的键取向顺序和最大的空间波动。相应地,低频振动的正常模式是最不本地化的,沿着这些模式的平均势能势垒是最高的堵塞状态附近的$P_d$。过冷液体的重入玻璃化转变和动力学是可预测的这些结构和振动的前体在零温度堵塞状态。

英文摘要:

In molecular dynamics simulations of soft glass-formers interacting via repulsions, we find that the glass transition temperature, dynamical heterogeneity, and glass fragility reach their maxima at the same crossover pressure $P_d$. Our analysis of the zero-temperature jammed states indicates that states at $P_d$ have the highest bond orientational order with the largest spatial fluctuation. Correspondingly, the low-frequency normal modes of vibration are the least localized and the average potential energy barrier along these modes are the highest for jammed states in the vicinity of $P_d$. The reentrant glass transition and dynamics of supercooled liquids are thus predictable by these structural and vibrational precursors in the zero-temperature jammed states.

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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