纳米锰锌铁氧体的制备及传递特性的研究
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摘要
锰锌铁氧体作为一种重要的软磁材料,它的应用价值和长期的基础研究使得该类软磁铁氧体材料被广泛应用于变压器、磁芯、磁头等。近年来,纳米锰锌铁氧体因其软磁特性和较高的稳定性等特点,又在肿瘤热疗和磁流变液等方面受到人们的广泛关注。
本论文系统地研究了锰锌铁氧体的制备、改性及其应用,具体研究内容如下:
(1)以FeCl3·6H2O,MnSO4·H2O,ZnSO4·7H2O为原料,NaOH为共沉淀剂,利用化学共沉淀法合成纳米锰锌铁氧体颗粒,考察了不同的锰锌配比对纳米颗粒磁性能的影响。并用油酸对其表面改性,结果发现油酸改性可以有效地阻止纳米颗粒的团聚,减小颗粒的粒径。将锰锌纳米颗粒作为填料改性TPV,研究纳米粒子的填充对TPV力学性能的影响。通过一系列试验发现,经油酸改性的锰锌铁氧体纳米颗粒比未改性的纳米颗粒更能提高TPV的拉伸强度和断裂伸长率。
(2)分别以A、B为表面活性剂,B和C为双表面活性剂,采用化学共沉淀方法制备锰锌铁氧体磁性流体,通过一系列手段进行表征,考察了不同表面活性剂对颗粒形貌、粒径及磁性能,以及对磁性流体性能的影响。同时分别探索了不同的磁性流体在给定交变磁场下的体外升温作用,分别考虑了不同的磁场强度和锰锌铁氧体固含量对升温效果的影响。在此基础上,选择性能各方面比较优良的表面活性剂制备得到的磁性流体,研究磁性流体在生物体外磁共振成像的效果,将肿瘤热疗与磁共振成像相结合。
(3)纳米锰锌铁氧体因其较高的稳定性和软磁特性等特点,对磁流变液的分散性、抗沉降稳定性都能起到改良和加强的作用。本论文采用机械球磨法制备出以铁粉为磁性分散相、钛酸酯偶联剂为分散剂,并添加一定量的纳米锰锌铁氧体颗粒为分散相的导热油基磁流变液,对样品的分散性能、抗沉降稳定性能和粘度等性能进行了分析研究。考察了磁性颗粒用量、表面改性剂用量等因素对磁流变液零场粘度、磁流变性能和沉降稳定性的影响。
As an important magnetic material, manganese-zinc ferrite, due to the great application and long-term basic research, has been widely used in the various areas such as transformers, coil cores, magnetic heads and so on. In recent years, the interests in Mn-Zn ferrite nanoparticles are growing based on their potential applications in magnetic fluid hyperthermia and magnetorheological fluid because of its soft magnetic property, high stability and other characteristics.
The preparation, characterization and application of Mn-Zn ferrites are investigated. Details are as follows:
1. The Mn-Zn ferrite nanoparticles were prepared by chemical co-precipitation using FeC13·6H2O, MnSO4·H2O and ZnSO4·7H2O as the starting materials. During the co-precipitation, the effects of the ratio of Mn2+ and Zn2+ concentration on the magnetic properties were considered. To prevent the aggregation of nanoparticles, oleic acid was used as surfactant. The obtained nanoparticles were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM) and thermogravimetry (TG). The aggregate size was significantly reduced after modification, leading to the high dispersibility of nanoparticles in thermoplastic vulcanizate (TPV). Compared with the bare nanoparticles, the modified nanoparticles are proved to improve the tensile strength and elongation of TPV.
2. The Mn0.8Zn0.2Fe2O4 magnetic nanoparticles were synthesized by co-precipitation; A and B were used as the surface modifier, respectively. Mn0.8Zn0.2Fe2O4 magnetic nanoparticles modified with bilayer surfactants were also prepared by co-precipitation. The results demonstrated that the nanoparticles modified by A had an average size of 80 nm and the saturation magnetization reached 41emu/g. Octahedral shaped Mn0.8Zn0.2Fe2O4 ferrites were synthesized using B as the surfactant and the evolution of these octahedra was examined by SEM and the mechanism was briefly discussed. VSM measurements revealed that the saturation magnetization was about 51emu/g at room temperature. Moreover, those different shaped Mn0.8Zn0.2Fe2O4 ferrites could be used to prepare magnetic fluid, which had potential applications in hyperthermia. The in-vitro heating experiments were performed, and the effect of Mn0.8Zn0.2Fe2O4 concentration and magnetic field intensity on heating effect was also investigated. The bilayer-modified nanoparticles had an average size of 15 nm, which could be used for fluid preparation. The magnetic fluid demonstrated fast magneto-temperature response, which had the potential application in both magnetic resonance imaging and magnetic fluid hyperthermia.
3. Nanometer Mn-Zn ferrites have many unique characteristics which can enhance the anti-reunite ability, the anti-settling ability and the mechanics capability of the aqueous magnetorheological fluids. By changing the dosage of magnetic nanoparticles and coupling agent, the properties of the fluids have been systematically investigated, which includes sedimental stability, viscosity and magnetorheology properties.
本论文系统地研究了锰锌铁氧体的制备、改性及其应用,具体研究内容如下:
(1)以FeCl3·6H2O,MnSO4·H2O,ZnSO4·7H2O为原料,NaOH为共沉淀剂,利用化学共沉淀法合成纳米锰锌铁氧体颗粒,考察了不同的锰锌配比对纳米颗粒磁性能的影响。并用油酸对其表面改性,结果发现油酸改性可以有效地阻止纳米颗粒的团聚,减小颗粒的粒径。将锰锌纳米颗粒作为填料改性TPV,研究纳米粒子的填充对TPV力学性能的影响。通过一系列试验发现,经油酸改性的锰锌铁氧体纳米颗粒比未改性的纳米颗粒更能提高TPV的拉伸强度和断裂伸长率。
(2)分别以A、B为表面活性剂,B和C为双表面活性剂,采用化学共沉淀方法制备锰锌铁氧体磁性流体,通过一系列手段进行表征,考察了不同表面活性剂对颗粒形貌、粒径及磁性能,以及对磁性流体性能的影响。同时分别探索了不同的磁性流体在给定交变磁场下的体外升温作用,分别考虑了不同的磁场强度和锰锌铁氧体固含量对升温效果的影响。在此基础上,选择性能各方面比较优良的表面活性剂制备得到的磁性流体,研究磁性流体在生物体外磁共振成像的效果,将肿瘤热疗与磁共振成像相结合。
(3)纳米锰锌铁氧体因其较高的稳定性和软磁特性等特点,对磁流变液的分散性、抗沉降稳定性都能起到改良和加强的作用。本论文采用机械球磨法制备出以铁粉为磁性分散相、钛酸酯偶联剂为分散剂,并添加一定量的纳米锰锌铁氧体颗粒为分散相的导热油基磁流变液,对样品的分散性能、抗沉降稳定性能和粘度等性能进行了分析研究。考察了磁性颗粒用量、表面改性剂用量等因素对磁流变液零场粘度、磁流变性能和沉降稳定性的影响。
As an important magnetic material, manganese-zinc ferrite, due to the great application and long-term basic research, has been widely used in the various areas such as transformers, coil cores, magnetic heads and so on. In recent years, the interests in Mn-Zn ferrite nanoparticles are growing based on their potential applications in magnetic fluid hyperthermia and magnetorheological fluid because of its soft magnetic property, high stability and other characteristics.
The preparation, characterization and application of Mn-Zn ferrites are investigated. Details are as follows:
1. The Mn-Zn ferrite nanoparticles were prepared by chemical co-precipitation using FeC13·6H2O, MnSO4·H2O and ZnSO4·7H2O as the starting materials. During the co-precipitation, the effects of the ratio of Mn2+ and Zn2+ concentration on the magnetic properties were considered. To prevent the aggregation of nanoparticles, oleic acid was used as surfactant. The obtained nanoparticles were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM) and thermogravimetry (TG). The aggregate size was significantly reduced after modification, leading to the high dispersibility of nanoparticles in thermoplastic vulcanizate (TPV). Compared with the bare nanoparticles, the modified nanoparticles are proved to improve the tensile strength and elongation of TPV.
2. The Mn0.8Zn0.2Fe2O4 magnetic nanoparticles were synthesized by co-precipitation; A and B were used as the surface modifier, respectively. Mn0.8Zn0.2Fe2O4 magnetic nanoparticles modified with bilayer surfactants were also prepared by co-precipitation. The results demonstrated that the nanoparticles modified by A had an average size of 80 nm and the saturation magnetization reached 41emu/g. Octahedral shaped Mn0.8Zn0.2Fe2O4 ferrites were synthesized using B as the surfactant and the evolution of these octahedra was examined by SEM and the mechanism was briefly discussed. VSM measurements revealed that the saturation magnetization was about 51emu/g at room temperature. Moreover, those different shaped Mn0.8Zn0.2Fe2O4 ferrites could be used to prepare magnetic fluid, which had potential applications in hyperthermia. The in-vitro heating experiments were performed, and the effect of Mn0.8Zn0.2Fe2O4 concentration and magnetic field intensity on heating effect was also investigated. The bilayer-modified nanoparticles had an average size of 15 nm, which could be used for fluid preparation. The magnetic fluid demonstrated fast magneto-temperature response, which had the potential application in both magnetic resonance imaging and magnetic fluid hyperthermia.
3. Nanometer Mn-Zn ferrites have many unique characteristics which can enhance the anti-reunite ability, the anti-settling ability and the mechanics capability of the aqueous magnetorheological fluids. By changing the dosage of magnetic nanoparticles and coupling agent, the properties of the fluids have been systematically investigated, which includes sedimental stability, viscosity and magnetorheology properties.
引文
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