Dissertation > Excellent graduate degree dissertation topics show

Formation of Magnetic BaFe12O19 and Fe3O4 Nanoparticles by Hydrothermal Synthesis and the Research of Their Physical Quality

Author: WuYeJun
Tutor: ZhuYueJin；WangJun
School: Ningbo University
Course: Theoretical Physics
Keywords: Magnetic Nanomaterials Hydrothermal Ordered structure Magnetic field induced assembly
CLC: TB383.1
Type: Master's thesis
Year: 2008
Downloads: 15
Quote: 0
Read: Download Dissertation

Abstract


Due to the high -density magnetic storage media , magnetic fluid and biomedical applications in areas such as the huge prospects , magnetic nanomaterials synthesis has been more and more attention . Especially since the magnetic ordered nanostructures spatial orientation and arrangement of elements and having a plurality of new properties is prepared nanodevices based miniaturized , so the magnetic nanoparticles assemble into a variety of ordered structure has significant scientific importance and should value . This paper aims to explore the structure of the hydrothermal synthesis of novel magnetic nano-materials to study its physical properties, especially magnetic properties, and nano- memory association between material structure . Details are summarized as follows : 1. With FeCl3 · 6H2O, Ba (OH) 2.8 H2O, BaCl2 · 2H2O as raw materials, mild hydrothermal reaction BaFe12O19 nanorods synthesized in air and argon gas atmosphere after the sintering treatment , a diameter of about 40nm, a length of about 150nm, more uniform size distribution . Vibrating sample magnetometer measurements show , BaFe12O19 nanorods have a high saturation magnetization (67.3emug-1) and coercivity (4511Oe). Sintering treatment in air , improve the crystallinity of the nanorods BaFe12O19 , reducing the number of oxygen vacancies in BaFe12O19 , thus dramatically affect the Fe-O-Fe ultra- exchange , and improve the magnetic properties of the BaFe12O19 . (2) to Fe (C5H5) 2, C3H6O, N2H4 · H2O as raw materials in the magnetic field -induced hydrothermal system Fe3O4 nanorods synthesized assembly structure . By XRD, MS, SEM Fe3O4 nanorods were characterized by morphology and magnetic properties. Each Fe3O4 nanorods assembled structure composed by a 2-5 nanorods , showing 3D structure . Magnetic Fe3O4 nanorods in the assembly process plays a key role. Based on these experimental results, we proposed structures may Fe3O4 nanorods growth process of assembly . Vibrating sample magnetometer measurements show , Fe3O4 nanorods saturation magnetization (Ms) about 82.6emug-1, discusses the directional growth of nanoparticles on the magnetic properties .

Related Dissertations

  1. Research on Magnetic Field Sensor Based on GMI Effect and Geomagnetic Matching Algorithm,P318
  2. Hydrothermal Synthesis of Oxide Hollow Spheres,TB383.4
  3. Research on the Structure and Characteristics of Permanent Magnetic Coupling,TH139
  4. The Technological Parameter Analysis and Influencing Factor Research on RUV4 Automobile Ignition Coils,U463.64
  5. The Influence of Magnetic Field Topology on Electron Motion in Hall Thrusters,V439.2
  6. Study of Tin Alloy Carbon Composite Used for Lithium Ion Battery,TM912.9
  7. Grid-Side Converter Control and Wind Turbine Emulator in Direct Drive Wind Power System,TM46
  8. Research of Electromagnetic Tracking Experimental System for Medical Application,TN966
  9. MRI Guoded Experimental Cryoablation of Rabbit’s Sciatic Nerve for MRI and Pathology Contrast Study,R445.2
  10. Flexible,rigid,Synthesis and characterization of mixed ligand complexes,O621.1
  11. Preparation of Epichlorohydrin from Crude Glycerol of Biodiesel By-product,TQ223.26
  12. Synthesis and Characterization of Carbonate Intercalated Layered Double Hydroxides and Their Structure Recovery Properties,TQ424.2
  13. Preparation and Characteration of Composite Microspheres with Dual-, Triple- Responsive Properties,O631.3
  14. Preparation of Layered Double Hydroxide Material and Research Adsorption Capacity,O611.4
  15. Preparation of One-dimensional Nano TiO2 and Study on the Decolorization of Dyeing Wastewater,TB383.1
  16. Preparation, Characterization and Application of Prussian Blue Composite Nanomaterials,TB383.1
  17. Mineralogical and Geochemical Evidence of the Presence of Ancient Paddy Soil Layer in Chuodun Ancient Agricultural Site, Kunshan,S-09
  18. Study on the Design of Magnetic Drum Planting Machine for Tobacco,S223.2
  19. The Clinic Value of Diffusion Weighted Whole Body Imaging with Background Body Signal Suppression (DWIBS) Compared with hPET/CT,R445.2
  20. The Quantitative Analysis and Biological Effects of Permanent Magnet Source Using for Magnetotherapy,R454
  21. Diffusion Tensor Imaging Study of Idiopathic Epilepsy at 3.0T High Field Magnetic Resonance Scaner,R445.2

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile