介绍了Ni2O3/Fe2O3复合纳米微粒磁性液体的制备方法。研究了不同强度的外磁场作用下,平行于场方向照射的光束透过磁性液体样品后,其光透射率随磁场通、断而下降、上升的重复变化情况。结果表明,对于不同体积分数的磁性液体,随着磁场通、断次数的增加,光透射率的下降弛豫时间逐渐增大,而上升弛豫时间逐渐减小;在相同强度的磁场作用下,体积分数越大,光透射率的最小值越小,且下降到最小值和回复至最大值所需时间越短。定性分析了实验结果的微观机制,讨论了微粒链的形成、微粒链在磁性液体内部的微观运动情况。
The preparation of Ni2O3/Fe2O3 nanocomposites ferrofluids is introduced. The change of the light transmittance with the on-off of the magnetic field is investigated after the light beam parallel to the direction of magnetic field goes through the ferrofluids samples under the influence of external magnetic field with different strength. Result shows that for different volume fractions of ferrofluids, the declining relaxation time of light transmittance increases gradually while the increasing relaxation time decreases with the increase of on-off time in the magnetic field. In the same magnetic field, the larger the volume fraction, the smaller the minimum value of the light transmission. Correspondingly, the time dropping to the minimum and returning to the maximum of the light transmission becomes shorter. The formation of particle chains and the micro-movement of chain in the ferrofluids are discussed and the micro-mechanism of the experimental results is analyzed qualitatively.
