Lattice model of dynamic heterogeneity and kinetic arrest in glass-forming liquids

被引：31
|
作者：
Tito, Nicholas B. [1 ]
Lipson, Jane E. G. [1 ]
Milner, Scott T. [2 ]
机构：
[1] Dartmouth Coll, Dept Chem, Hanover, NH 03755 USA
[2] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA
来源：
SOFT MATTER | 2013年 / 9卷 / 11期
基金：
美国国家科学基金会;
关键词：
SUPERCOOLED LIQUID; LENGTH SCALE; TRANSITION; POLYMERS; SIMULATION; NANOSCALE; MOBILITY; BEHAVIOR; SURFACE; FILMS;
D O I：
10.1039/c3sm25679k
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
We present a new model of glass-forming liquids in which free volume fluctuations drive dynamic heterogeneity and diffusion of mobility. Our kinetic model is developed from a microscopic perspective where free volume creation requires existing free volume nearby as a source of mobility; free volume diffusion and destruction is spontaneous by virtue of its own mobility. Simulations indicate "molten" and kinetically arrested "glassy" regions in parameter space, and a critical point where dynamic length and intermittency time scales grow as power laws. Systems near the critical point contain colonies of free volume that propagate around bubbles of glassified material.
引用
收藏
页码：3173 / 3180
页数：8
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