论文部分内容阅读
介绍了由强磁γ-Fe2O3/Ni2O3复合纳米微粒和弱磁Fe5O7(OH)·4H2O纳米微粒构成的二元磁性液体的制备方法,并用X射线衍射仪、透射电子显微镜、振动样品磁强计分别对这两种微粒的晶体结构、表面形貌及其磁性进行了表征.同时测量了单元磁性液体和二元磁性液体在平行于激光照射方向且具有不同梯度外磁场作用下场致光透射强度的弛豫变化,揭示了二元磁性液体有不同于单元磁性液体的特征弛豫时间,并从微观结构上分析了产生弛豫时间差异的原因.
The preparation method of binary magnetic fluid consisting of ferromagnetic γ-Fe2O3 / Ni2O3 composite nanoparticles and weakly-magnetic Fe5O7 (OH) · 4H2O nanoparticles is introduced. The preparation methods of the binary magnetic fluids are described respectively by X-ray diffraction, transmission electron microscopy and vibrational sample magnetometer The crystal structure, surface morphology and magnetic properties of these two kinds of particles were characterized.Meanwhile, the relaxation of the field intensity of the unit magnetic liquid and the binary magnetic liquid under the magnetic field with different gradient and parallel to the laser irradiation direction was measured The variation of the relaxation time reveals the characteristic relaxation time of the binary magnetic fluid which is different from that of the unit magnetic fluid and analyzes the reason of the difference of the relaxation time from the microstructure.