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 $\varphi >0.18$. 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.

中文翻译：

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悬浮在矿物油中的多分散非球形石墨颗粒的流变学

我们研究了填料浓度和微观物理学对悬浮在牛顿矿物油中的多分散鳞片石墨颗粒流变学的作用。在稳定剪切下，我们的样品表现出剪切稀化，并且观察到体积分数的屈服行为$\phi >0.18$. 使用 Arrhenius 型水平位移因子观察到时间-温度叠加，给出依赖于石墨体积分数的流动活化能，表明悬浮液中松弛过程的浓度依赖性贡献。流动曲线由基于约束的模型拟合，表明流动行为受摩擦和粘附接触控制，该模型表明粘附应力与温度有关。