磁性液体的场致光透射驰豫回复性研究

Investigation of the Repeat Behaviors for Field-Induced Relaxation of Transmission Light Through Ferrofluids

用Massart法制备了Ni2O3/Fe2O3复合微粒磁性液体.测量了磁性液体在不同强度的外磁场作用下,沿磁场方向的光透射率随磁场通断而下降、上升的重复变化曲线.发现通磁场后光透射强度的下降速率与断磁场后光透射强度的回复速率随通断磁场重复次数变化,并趋于一致.从磁性液体的微结构变化探讨了导致这种现象的内在因素.

A ferrofluid based on Ni2O3/Fe2O3 composite nanoparticles was prepared with the Massart method.Under an applied external magnetic field,the relaxation variation curves of transmission light along the field direction,decreasing or increasing,following the magnetic field switching on or off,were measured.It was found that the decreasing（increasing） ramp of the intensity of transmission light after the magnetic field switching on（off） varied with the repeat times of the field applying,and finally approached a stable value.The underlying factors responsible for these phenomena are discussed in this paper from the perspective of the changes in the microstructure of the ferrofluid.