磁光双功能复合材料的制备与研究

发布时间：2018-03-05 15:20

本文选题：纳米Fe3O4粒子　切入点：二氧化硅　出处：《沈阳工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：近几年，磁光双功能复合材料在医学诊断和治疗领域得到了广泛的应用。在本论文中通过超声化学共沉淀法制备纳米Fe3O4晶体，主要研究了沉淀剂种类、扰动方式以及分散剂种类对纳米Fe3O4晶体的形貌和尺寸的影响；然后通过超声化学沉淀法在纳米Fe3O4粒子表面沉积一层二氧化硅，，主要研究了水解剂对复合粒子尺寸的影响；最后在Fe3O4@SiO2表面包覆一层发光材料，主要研究了制备方法对发光性能的影响。在本论文中，借助于X射线粉末衍射仪、场发射扫描电镜、能谱分析仪、傅立叶红外变换光谱仪、比表面积测试仪、荧光分光光度计等设备检测分析表明：制备出了纯度较高的纳米Fe3O4晶体，粒子发生了严重的团聚；二氧化硅在纳米Fe3O4粒子表面包覆的很好，尺寸大小约为20nm；LaF333:Eu+晶体和YVO4:Eu+晶体在Fe3O4@SiO2复合粒子表面包覆的很好，尺寸大小约为20-30nm，其中，Ce3+离子促进Eu3+离子的发光。最后通过不同结果的对比分析，得出了最佳的制备方案。在制备纳米Fe3O4晶体过程中，沉淀剂选为氨水、分散剂为PEG6000、扰动方式为机械搅拌下超声震荡。在制备Fe3O4@SiO2复合粒子过程中，水解剂选为NH4Cl。在制备磁光双功能复合粒子过程中，制备方法选为水热法。
[Abstract]:In recent years, magneto-optic bifunctional composites have been widely used in the field of medical diagnosis and treatment. In this paper, nanocrystalline Fe3O4 crystals were prepared by ultrasonic chemical coprecipitation. The influence of disturbance mode and dispersant type on the morphology and size of Fe3O4 nanocrystalline was studied, and then a layer of silica was deposited on the surface of Fe3O4 nanoparticles by ultrasonic chemical precipitation method, and the effect of hydrolysate on the size of composite particles was studied. Finally, a layer of luminescent material was coated on the surface of Fe3O4@SiO2, and the effect of the preparation method on the luminescent properties was studied. In this paper, by means of X-ray powder diffractometer, field emission scanning electron microscope, energy spectrum analyzer, Fourier transform infrared spectrometer, specific surface area tester, The analysis of fluorescence spectrophotometer and other equipment showed that the high purity Fe3O4 crystal was prepared, and the particles were agglomerated seriously, and silica coated well on the surface of Fe3O4 nanoparticles. The size of LaF333: EU crystal and YVO4:Eu crystal is about 20 nm and about 20 ~ 30 nm on the surface of Fe3O4@SiO2 composite particles. Ce3 ions promote the luminescence of Eu3 ion. Finally, the optimum preparation scheme was obtained by comparing the different results. In the process of preparing nanocrystalline Fe3O4 crystal, the precipitant was chosen as ammonia water. The dispersant is PEG6000, and the disturbance mode is ultrasonic oscillation under mechanical agitation. In the process of preparing Fe3O4@SiO2 composite particles, the hydrolytic agent is chosen as NH _ 4Cl. In the process of preparing magneto-optic bifunctional composite particles, the preparation method is chosen as hydrothermal method.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

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