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We study the role of filler concentration and microphysics on the rheology of polydisperse flake-graphite particles suspended in Newtonian mineral oil. Under steady shear, our samples exhibit shear thinning, and yielding behavior is observed for volume fractions ϕ>0.18. Time-temperature superposition was observed using an Arrhenius-type horizontal shift factor, giving a flow activation energy that is dependent on the graphite volume fraction, suggesting concentration-dependent contributions to relaxation processes in the suspensions. The flow curves are fitted by a constraint-based model, indicating that the flow behavior is controlled by frictional and adhesive contacts, with the model suggesting that the adhesive stress is temperature dependent.
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Larsen et al. (2022) studied this question.
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