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The yet virtually unexplored class of soft colloidal rods with small aspectratio is investigated and shown to exhibit a very rich phase and dynamicbehavior, spanning from liquid to nearly melt state. Instead of nematic order,these short and soft nanocylinders alter their organization with increasingconcentration from isotropic liquid with random orientation to one withpreferred local orientation and eventually a multi-domain arrangement withlocal orientational order. The latter gives rise to a kinetically suppressedstate akin to structural glass with detectable terminal relaxation, which, onincreasing concentration reveals features of hexagonally packed order as inordered block copolymers. The respective dynamic response comprises fourregimes, all above the overlapping concentration of 0.02 g/ml: I) from 0.03 to0.1 g/mol the system undergoes a liquid-to-solid like transition with astructural relaxation time that grows by four orders of magnitude. II) from 0.1to 0.2 g/ml a dramatic slowing-down is observed and is accompanied by anevolution from isotropic to multi-domain structure. III) between 0.2 and 0.6g/mol the suspensions exhibit signatures of shell interpenetration and jamming,with the colloidal plateau modulus depending linearly on concentration. IV) at0.74 g/ml in the densely jammed state, the viscoelastic signature ofhexagonally packed cylinders from microphase-separated block copolymers isdetected. These properties set short and soft nanocylinders apart from longcolloidal rods (with large aspect ratio) and provide insights for fundamentallyunderstanding the physics in this intermediate soft colloidal regime, as wellas and for tailoring the flow properties of non-spherical soft colloids.

Short and soft: multi-domain organization, tunable dynamics and jamming in suspensions of grafted colloidal cylinders with small aspect ratio