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28 March 2024
 
  » arxiv » 0809.3401

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Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition
Giovanni Brambilla ; Djamel El Masri ; Matteo Pierno ; George Petekidis ; Andrew B. Schofield ; Ludovic Berthier ; Luca Cipelletti ;
Date 19 Sep 2008
AbstractWe use dynamic light scattering and computer simulations to study equilibrium dynamics and dynamic heterogeneity in concentrated suspensions of colloidal hard spheres. Our study covers an unprecedented density range and spans seven decades in structural relaxation time, $ a$, including equilibrium measurements above $phi_{ m c}$, the critical volume fraction where the mode-coupling theory predicts a glass transition. Instead of falling out of equilibrium, the system remains ergodic above $phi_{ m c}$ and enters a new dynamical regime where $ a$ increases with a functional form that was not anticipated by theory or previous experiments, while the amplitude of dynamic heterogeneity increases logarithmically slowly with $ a$, as found in molecular glass-formers close to the glass transition.
Source arXiv, 0809.3401
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