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Glass transition dynamics of hard sphere like microgel colloids with short-ranged attractions

We have studied by dynamic light scattering the glass transition dynamics of a binary mixture of polystyrene microgel particles with a size ratio of R small /R large = 0.81 and a number ratio of N small /N large 2.7, where a short-ranged depletion attraction (δ 0.06) was induced by addition of linear polystyrene. This system shows a reentrant glass transition. We have determined the glass transition lines of this system in the experimental control parameter space given by the colloid volume fraction φ and the polymer concentration c p by employing the power law of mode coupling theory (MCT) for the α-relaxation times. We find a reentry region which is much larger than predicted by theory and reported for another colloidal system with depletion attractions. Analysing the fluid dynamics along the transition lines with the β-scaling law of MCT we extract the c p dependence of the exponent parameter λ and the non-ergodicity parameter f c q . The results are in qualitative agreement with the prediction of MCT for increasing attraction strength. The observed 'jump' of f c q is indicative of a change of the close by glass phase from a packing-driven to a bonding-driven glass. The increase of λ to 0.91 and its subsequent decrease may indicate the neighbourhood of an A 4 singularity.