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Concentrated suspensions of Brownian hard-spheres in water are an epitome forunderstanding the glassy dynamics of both soft materials and supercooledmolecular liquids. From an experimental point of view, such systems areespecially suited to perform particle tracking easily, and, therefore, are abenchmark for novel optical techniques, applicable when primary particlescannot be resolved. Differential Variance Analysis (DVA) is one such noveltechnique that simplifies significantly the characterization of structuralrelaxation processes of soft glassy materials, since it is directly applicableto digital image sequences of the sample. DVA succeeds in monitoring not onlythe average dynamics, but also its spatio-temporal fluctuations, known asdynamic heterogeneities. In this work, we study the dynamics of densesuspensions of Brownian beads in water, imaged through digitalvideo-microscopy, by using both DVA and single-particle tracking. We focus ontwo commonly used signatures of dynamic heterogeneities: the dynamicsusceptibility, $\chi_4$, and the non-Gaussian parameter, $\alpha_2$. By directcomparison of these two quantities, we are able to highlight similarities anddifferences. We do confirm that $\chi_4$ and $\alpha_2$ provide qualitativelysimilar information, but we find quantitative discrepancies in the scalings ofcharacteristic time and length scale on approaching the glass transition.

Concentrated suspensions of Brownian beads in water: dynamic heterogeneities trough a simple experimental technique