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Thermal behaviour and particle size evaluation of primary clusters in a water-based magnetic fluid

机译：水基磁流体中初级团簇的热行为和粒度评估

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This paper reports the experimental research on thermal behaviour and particle size evaluation of primary clusters of ferromagnetic nano-particles in a water-based magnetic fluid. The magnetic fluids are suspensions of ultra fine particles coated with a molecular layer of dispersant in a liquid carrier such as water or kerosene. The particles are coated with single- or double-layer of surfactant to achieve stable dispersion. Numerous experimental studies have indicated the existence of the primary cluster of ferromagnetic nano-particles in a water-based magnetic fluid. The purpose of this research is to evaluate the particle size of the primary clusters by applying the Einstein's equation for Brownian motion assuming that the primary cluster has a spherical-shape. The thermal behaviour of ferromagnetic nano-particles in magnetic fluids is investigated through the micro visualization using the optical darkfield microscope system and particle tracking velocimetry data processing system. Real-time visualization of the Brownian motion of primary clusters in a water-based magnetic fluid was carried out. The experimental results clarified that the primary cluster size depends upon the concentration of the ferromagnetic nano-particle in the magnetic fluid.
机译：本文报道了水基磁流体中铁磁纳米粒子的主要团簇的热行为和粒度评估的实验研究。磁性流体是涂有分散剂分子层的超细颗粒在液体载体（如水或煤油）中的悬浮液。用单层或双层表面活性剂涂覆颗粒以实现稳定的分散。大量的实验研究表明，水基磁流体中存在铁磁纳米粒子的主要簇。这项研究的目的是通过应用爱因斯坦方程的布朗运动来评估初级团簇的粒径，假定初级团簇为球形。通过使用光学暗场显微镜系统和粒子跟踪测速数据处理系统的微观可视化，研究了磁性流体中铁磁纳米粒子的热行为。实时可视化了水基磁流体中初级团簇的布朗运动。实验结果表明，初级团簇的大小取决于磁性流体中铁磁性纳米粒子的浓度。

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