Structurally determined directionality identifies the boundary between mobile and immobile domains in a disordered material.
The structure and available degrees of freedom of an amorphous configuration can determine the location of dynamic heterogeneities. In the same way, these features can also determine the directionality of the particle motion. In this paper we propose that directionality can be attributed to those particles that only participate in a single unconstrained motion. The consequences of this suggestion in terms of the spatial distribution of particles with high directionality are explored using a random bond model.
University Chemical Laboratories, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom.
Vanessa K
VK
de Souza
Peter
P
Harrowell