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Dense suspensions of model hard-sphere-like colloids, with different particlesizes, are examined experimentally in the glass state, under shear andextensional rheology. Under steady shear flow we detect Discontinuous ShearThickening (DST) above a critical shear rate. Start-up shear experiments showstress overshoots in the vicinity of the onset of DST related with a change inmicroscopic morphology, as the sample shows dilatancy effects. The analysis ofthe normal stress together with direct sample observation by high speed camera,indicates the appearance of positive N1 and dilation behavior at the shearthickening onset. Dilatancy effects are detected also under extensional flow.The latter was studied through capillary breakup and filament stretchingexperimental setups, where liquid-like response is seen for strain rate lowerthan a critical strain rate and solid like-behavior for higher strain rates.Monitoring the filament thinning processes under different conditions (volumefractions and strain rates) we have created a state diagram where all responsesof a hard-sphere suspension (Newtonian, shear thinning, shear thickening,dilatant) are shown. We finally compare the shear thickening response of thesehard-sphere-like suspensions and glasses in shear with that in extensionalflow.

Dilatancy in dense suspensions of model hard-sphere-like colloids under shear and extensional flow