Ageing dynamics of colloidal hard sphere glasses

Details Ageing dynamics of colloidal hard sphere glasses Ageing dynamics of colloidal hard sphere glasses

2010-05-26

arxiv.org/abs/1005.4721v1

Physics

Condensed Matter

Soft Condensed Matter

28 pages, including 3 tables and 17 figures

Scientific paper

We report results of dynamic light scattering measurements of the coherent intermediate scattering function (ISF) of glasses of hard spheres for several volume fractions and a range of scattering vectors around the primary maximum of the static structure factor. The ISF shows a clear crossover from an initial fast decay to a slower non-stationary decay. Ageing is quantified in several different ways. However, regardless of the method chosen, the perfect "aged" glass is approached in a power-law fashion. In particular, the coupling between the fast and slow decays, as measured by the degree of stretching of the ISF at the crossover, also decreases algebraically with waiting time. The non-stationarity of this coupling implies that even the fastest detectable processes are themselves non-stationary.

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