γ-Fe_2O_3-p-MgFe_2O_4二元磁性液体的磁性及场致光透射效应研究
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摘要
用共沉淀法制备出γ-Fe_2O_3亚铁磁性纳米颗粒及p-MgFe_2O_4顺磁性纳米微粒,并用Massart法分别制备出了相应的磁性液体。将γ-Fe_2O_3磁性液体和p-MgFe_2O_4磁性液体母液按照一定的体积分数比均匀混合后,得到二元磁性液体。
用XRD、EDX、TEM分别对合成磁性液体的纳米颗粒的晶体结构、元素比例、以及形貌进行表征,结果表明γ-Fe_2O_3颗粒结晶较好,而p-MgFe_2O_4颗粒结晶稍差,但两者颗粒形状都近似呈球形。通过对纳米颗粒的粒径分布分析,得出γ-Fe_2O_3的平均粒径均为8.39nm,p-MgFe_2O_4的平均粒径均为5.83nm,且两种微粒的粒径都满足对数正态分布。
用VSM测量了磁性纳米颗粒和磁性液体的磁化特性,得出单元和二元两种体系的磁化强度,其结果表明无外场作用下,一些微粒会自组装形成磁矩闭合的环状结构,这些环状结构对磁化强度没有贡献。以致在γ-Fe_2O_3磁性液体中,其饱和磁化强度小于通过微粒磁化强度计算的理论值。在二元磁性液体的磁化过程,p-MgFe_2O_4微粒的偶极子会使一部分环状结构的方向偏转到磁场方向,从而使环状结构破裂。因此,γ-Fe_2O_3饱和磁化强度部分会增强,其磁化过程表现出比单一的γ-Fe_2O_3磁性液体更容易被磁化。二元体系中的磁化性质不等于单元体系磁化性质的简单线性叠加。
测量了在各种磁场作用下,透过二元磁性液体的光透射变化情况。结果表明,弛豫时间与磁性液体中微粒体积分数、磁场强度、磁场梯度以及弱磁性微粒的比例等因素有关。并从微观进行了分析,根据颗粒链的形成与运动模型,对二元磁性液体的光透射率变化进行了理论解释和链运动模拟。
Theγ-Fe_2O_3 ferrimagnetic nanoparticles and p-MgFe_2O_4 paramagnetic nanoparticles are produced by chemical co-precipitation technology. Using the nanoparticles,γ-Fe_2O_3 ferrofluids and p-MgFe_2O_4 paramagnetic fluids are synthesized respectively by Massart's method. The binaryferrofluids are obtained by mixing both the ferrofluids and the paramagnetic fluids.
The crystal structure, atom ration and morphology are analyzed by XRD、TEM、EDX, respectively. The results show that particles are preferable crystal, the morphology of bothγ-Fe_2O_3 and p-MgFe_2O_4 particles are basically sphere, the median value ofγ-Fe_2O_3 particles diameter is 8.39nm and the p-MgFe_2O_4 particles diameter is 5.38nm. The statistical analysis show that the particle's size distribution is satisfy log normal distribution
The magnetization of the system of ferrofluids and mixed binary nanoparticles system are measured by VSM. The results show that in absence of magnetic field, some particles could self-assemble into aggregates of closed ring-like structure which have no contribution to the magnetization for theγ-Fe_2O_3 ferrofluids. These ring-like aggregates result in the saturation magnetization of theγ-Fe_2O_3 ferrofluids smaller than the theoretical value calculated from the particles. During magnetization process, the polarized p-MgFe_2O_4 particles could make some ring-like structure's orientation turned to the direction of the field, so that the rings could fragment. Therefore, the saturation magnetization ofγ-Fe_2O_3 ferrofluids part in the binary ferrofluids strengthens and the magnetization process behaves easier than the singleγ-Fe_2O_3 ferrofluids. Themagnetization of the binary system can not simply be added from magnetization of single system.
The transmission rate of light goes through ferrofluids under different kinds of magnetic field is measured. The experimental results indicate that the relaxation time depends on the particle volume fraction, magnetic field intensity, magnetic field gradient and the ratio of weak magnetic particles to strong magnetic particles and so forth. Also, the results are explained in microscopic. The variation of transmission light is interpreted in theoretical and chain-motion modeled by the model of chain-formed of particles and the movement of the chains.
用XRD、EDX、TEM分别对合成磁性液体的纳米颗粒的晶体结构、元素比例、以及形貌进行表征,结果表明γ-Fe_2O_3颗粒结晶较好,而p-MgFe_2O_4颗粒结晶稍差,但两者颗粒形状都近似呈球形。通过对纳米颗粒的粒径分布分析,得出γ-Fe_2O_3的平均粒径均为8.39nm,p-MgFe_2O_4的平均粒径均为5.83nm,且两种微粒的粒径都满足对数正态分布。
用VSM测量了磁性纳米颗粒和磁性液体的磁化特性,得出单元和二元两种体系的磁化强度,其结果表明无外场作用下,一些微粒会自组装形成磁矩闭合的环状结构,这些环状结构对磁化强度没有贡献。以致在γ-Fe_2O_3磁性液体中,其饱和磁化强度小于通过微粒磁化强度计算的理论值。在二元磁性液体的磁化过程,p-MgFe_2O_4微粒的偶极子会使一部分环状结构的方向偏转到磁场方向,从而使环状结构破裂。因此,γ-Fe_2O_3饱和磁化强度部分会增强,其磁化过程表现出比单一的γ-Fe_2O_3磁性液体更容易被磁化。二元体系中的磁化性质不等于单元体系磁化性质的简单线性叠加。
测量了在各种磁场作用下,透过二元磁性液体的光透射变化情况。结果表明,弛豫时间与磁性液体中微粒体积分数、磁场强度、磁场梯度以及弱磁性微粒的比例等因素有关。并从微观进行了分析,根据颗粒链的形成与运动模型,对二元磁性液体的光透射率变化进行了理论解释和链运动模拟。
Theγ-Fe_2O_3 ferrimagnetic nanoparticles and p-MgFe_2O_4 paramagnetic nanoparticles are produced by chemical co-precipitation technology. Using the nanoparticles,γ-Fe_2O_3 ferrofluids and p-MgFe_2O_4 paramagnetic fluids are synthesized respectively by Massart's method. The binaryferrofluids are obtained by mixing both the ferrofluids and the paramagnetic fluids.
The crystal structure, atom ration and morphology are analyzed by XRD、TEM、EDX, respectively. The results show that particles are preferable crystal, the morphology of bothγ-Fe_2O_3 and p-MgFe_2O_4 particles are basically sphere, the median value ofγ-Fe_2O_3 particles diameter is 8.39nm and the p-MgFe_2O_4 particles diameter is 5.38nm. The statistical analysis show that the particle's size distribution is satisfy log normal distribution
The magnetization of the system of ferrofluids and mixed binary nanoparticles system are measured by VSM. The results show that in absence of magnetic field, some particles could self-assemble into aggregates of closed ring-like structure which have no contribution to the magnetization for theγ-Fe_2O_3 ferrofluids. These ring-like aggregates result in the saturation magnetization of theγ-Fe_2O_3 ferrofluids smaller than the theoretical value calculated from the particles. During magnetization process, the polarized p-MgFe_2O_4 particles could make some ring-like structure's orientation turned to the direction of the field, so that the rings could fragment. Therefore, the saturation magnetization ofγ-Fe_2O_3 ferrofluids part in the binary ferrofluids strengthens and the magnetization process behaves easier than the singleγ-Fe_2O_3 ferrofluids. Themagnetization of the binary system can not simply be added from magnetization of single system.
The transmission rate of light goes through ferrofluids under different kinds of magnetic field is measured. The experimental results indicate that the relaxation time depends on the particle volume fraction, magnetic field intensity, magnetic field gradient and the ratio of weak magnetic particles to strong magnetic particles and so forth. Also, the results are explained in microscopic. The variation of transmission light is interpreted in theoretical and chain-motion modeled by the model of chain-formed of particles and the movement of the chains.
引文
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