Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2001-07-13
Phys. Rev. Lett._89_, 095704 (2002)
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages, 4 figures; text & figures revised in v2
Scientific paper
10.1103/PhysRevLett.89.095704
We use confocal microscopy to study the motions of particles in concentrated colloidal systems. Near the glass transition, diffusive motion is inhibited, as particles spend time trapped in transient ``cages'' formed by neighboring particles. We measure the cage sizes and lifetimes, which respectively shrink and grow as the glass transition approaches. Cage rearrangements are more prevalent in regions with lower local concentrations and higher disorder. Neighboring rearranging particles typically move in parallel directions, although a nontrivial fraction move in anti-parallel directions, usually from pairs of particles with initial separations corresponding to the local maxima and minima of the pair correlation function $g(r)$, respectively.
Weeks Eric R.
Weitz David A.
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