Short and long range correlated motion observed in colloidal glasses and liquids

Details Short and long range correlated motion observed in colloidal glasses and liquids Short and long range correlated motion observed in colloidal glasses and liquids

2006-10-06

arxiv.org/abs/cond-mat/0610195v1

J. Phys.: Cond. Mat. 19, 205131 (2007)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Submitted to J Phys: Cond Mat; for Workshop on Nonequilibrium Phenomena in Glasses (Pisa, September 2006)

Scientific paper

10.1088/0953-8984/19/20/205131

We use a confocal microscope to examine the motion of individual particles in a dense colloidal suspension. Close to the glass transition, particle motion is strongly spatially correlated. The correlations decay exponentially with particle separation, yielding a dynamic length scale of O(2-3 sigma) (in terms of particle diameter sigma). This length scale grows modestly as the glass transition is approached. Further, the correlated motion exhibits a strong spatial dependence on the pair correlation function g(r). Motion within glassy samples is weakly correlated, but with a larger spatial scale for this correlation.

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