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A random first order theory of liquid-glass transition.

机译:液体玻璃化转变的随机一阶理论。

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摘要

It is believed that all classical fluids could form glasses if cooled sufficiently fast so as to avoid crystallization. Various phenomena including violation of the usual Arrhenius law, stretched relaxations, deviations from the Stokes-Einstein relation in hydrodynamics, and aging have been observed in the laboratory. In this thesis, a microscopically motivated theory of glassy dynamics based on an underlying random first order transition is developed to explain the magnitude and variation of free energy barriers for glassy relaxation. A variety of empirical correlations embodied in the concept of liquid “fragility” are shown to be quantitatively explained by such a model. Fragility parameters, the size of heterogeneities, the degree of stretching of relaxations, and the enhancement of translational diffusion are derived from theory. The wide variety of kinetic behaviors in liquids of quite disparate chemical nature reflects quantitative rather than qualitative differences in their energy landscapes as it turns out.
机译:据认为,如果冷却得足够快以避免结晶,所有经典流体都可能形成玻璃。在实验室中已经观察到各种现象,包括违反通常的阿伦尼乌斯定律,拉伸松弛,流体动力学偏离斯托克斯-爱因斯坦关系以及老化。在本文中,基于微观随机一阶跃迁的微观动力学玻璃动力学理论被开发来解释玻璃态弛豫的自由能垒的大小和变化。液体“易碎性”概念中体现的各种经验相关性都可以通过这种模型进行定量解释。易碎性参数,异质性的大小,弛豫的延伸程度以及平移扩散的增强是从理论中得出的。事实证明,在化学性质完全不同的液体中,各种各样的动力学行为反映了它们能量分布的定量而非定性差异。

著录项

  • 作者

    Xia, Xiaoyu.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 55 p.
  • 总页数 55
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 O49;
  • 关键词

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