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

Eric R. Weeks·John C. Crocker·David A. Weitz
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Abstract

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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Eric R. Weeks, John C. Crocker, David A. Weitz. 2006-10-06. Short and long range correlated motion observed in colloidal glasses and liquids. https://doi.org/10.1088/0953-8984%2F19%2F20%2F205131

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