Related Experiment Video
Updated: Jul 15, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
Strong correlation between local free volume and stringlike motions in a hard-disk glass former
Chu Xiao1, Masaharu Isobe2, Daigo Mugita2
1School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China. libo2021@hit.edu.cn.
None:
Glass formers are ubiquitous, but their dynamics under deep supercooling are still under intensive debate. Free volume plays a central role in many theoretical descriptions, but earlier studies often reported only weak correlations between local free volume and particle mobility. We analyze free volume by measuring excess local unoccupied volume around jumping particles in a dense hard-disk system. While free volume in highly localized regions is found to be quite uncorrelated with dynamics at structural relaxation time scales, strong correlations are clearly observed between regions of several particle diameters wide and dynamics at much shorter times. Free volume is shown to be more abundant at tails than at heads during stringlike particle jumping motions.
Related Concept Videos
Elastic Strain Energy for Shearing Stresses
Frequency of Spring-Mass System
Consider a block on a spring on a frictionless surface. There...
Viscosity of Fluid
Speed of Sound in Solids and Liquids
Elastic Strain Energy for Normal Stresses
If...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

