Institut des Matériaux Jean Rouxel, CNRS, Université de Nantes, 44322 Nantes cedex 3, France.
Phys Chem Chem Phys. 2013 Sep 14;15(34):14476-86. doi: 10.1039/c3cp51371h. Epub 2013 Jul 29.
We report on the rheological and electrical properties of non-aqueous carbon black (CB) suspensions at equilibrium and under steady shear flow. The smaller the primary particle size of carbon black is, the higher the magnitude of rheological parameters and the conductivity are. The electrical percolation threshold ranges seem to coincide with the strong gel rather than the weak gel rheological threshold ones. The simultaneous measurements of electrical properties under shear flow reveal the well-known breaking-and-reforming mechanism that characterises such complex fluids. The small shear rate breaks up the network into smaller agglomerates, which in turn transform into anisometric eroded ones at very high shear rates, recovering the network conductivity. The type of carbon black, its concentration range and the flow rate range are now precisely identified for optimizing the performance of a redox flow battery. A preliminary electrochemical study for a composite anolyte (CB/Li4Ti5O12) at different charge-discharge rates and thicknesses is shown.
我们研究了非水基碳黑（CB）悬浮液在平衡状态和稳态剪切流下的流变和电学性质。碳黑的初级粒径越小，流变参数和电导率的幅度就越高。电渗流阈值范围似乎与强凝胶而不是弱凝胶流变性阈值范围相吻合。在剪切流下同时测量电学性质揭示了这种复杂流体的特征，即众所周知的破坏-再形成机制。较小的剪切速率将网络分解成较小的团聚体，而在非常高的剪切速率下，团聚体又转变成各向异性的侵蚀团聚体，恢复网络电导率。现在已经精确地确定了碳黑的类型、浓度范围和流速范围，以优化氧化还原流电池的性能。展示了不同充放电速率和厚度下复合阳极电解液（CB/Li4Ti5O12）的初步电化学研究。
