Abstract In this study, we prepared calcium ferrite (CaFe2O4) nanocrystal clusters by a solvothermal method and evaluated their application potential in magnetorheological (MR) fluid. The morphology, composition, microstructure and magnetic properties of the CaFe2O4 nanocrystal clusters were investigated in detail. The as-prepared CaFe2O4-based MR fluid showed typical Bingham fluid behavior, changing from a liquid-like to a solid-like structure under an external magnetic field. Compared with carbonyl iron (CI) particles, the MR fluid based on CaFe2O4 nanocrystal clusters showed enhanced sedimentation stability, which can be mainly due to the reduced density mismatch between dispersed phase and carrier fluid. In conclusion, the as-prepared CaFe2O4 nanocrystal clusters are considered as a promising candidate for high-performance MR fluid.

中文翻译：

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用于增强沉降稳定性的磁流变液铁酸钙纳米晶簇的合成

摘要 在这项研究中，我们通过溶剂热法制备了铁酸钙 (CaFe2O4) 纳米晶簇，并评估了它们在磁流变 (MR) 流体中的应用潜力。详细研究了CaFe2O4纳米晶簇的形貌、组成、微观结构和磁性能。所制备的基于 CaFe2O4 的 MR 流体表现出典型的宾汉流体行为，在外部磁场下从类液体结构变为类固体结构。与羰基铁 (CI) 颗粒相比，基于 CaFe2O4 纳米晶簇的 MR 流体表现出增强的沉降稳定性，这可能主要是由于分散相和载体流体之间的密度失配降低。总之，所制备的 CaFe2O4 纳米晶簇被认为是高性能 MR 流体的有希望的候选者。