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Preparation of Nano Ferrite Particle by Chemical Way in High Static Magnetic Field(HSMF)

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Preparation of Nano Ferrite Particle by Chemical Way in High Static Magnetic Field(HSMF) Yunbo Zhong, Li Zhihua, Zhongming Ren Shanghai University – PowerPoint PPT presentation

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Title: Preparation of Nano Ferrite Particle by Chemical Way in High Static Magnetic Field(HSMF)


1
Preparation of Nano Ferrite Particle by Chemical
Way in High Static Magnetic Field(HSMF)
  • Yunbo Zhong, Li Zhihua, Zhongming Ren
  • Shanghai University

2
Process of Material in HSMF
Metallic Material
Nano-Material
HSMF
Organic or Biological Material
Inorganic Non-metallic Material
3
Methods for Preparation of Nano-particle
1?High Energy Grinding 2?Evaporation 3?Co-Precip
itation 4?Sol-Gel 5?Hydrothermal
Preparation 6?By Plasma And so on
4
Several Questions About Preparation of Nano
Material by Chemical Way in HSMF
  1. Will Magnetic Field Effect the Process of
    Chemical Reaction?
  2. Will Magnetic Field Effect the Process of
    Sediment/nucleation of Nano Particle?
  3. Will Magnetic Field Effect the Growth of the Nano
    Particle?
  4. Will Magnetic Field Effect the Performance of
    Nano Material?

5
Why select Ferrite
  • Ferrite is widely used in electric power/electron
    and communication industry
  • Nano ferrite material has better performance
  • In some usage, shape anisotropy of nano ferrite
    will be welcome for its excellent magnetic
    property
  • How magnetic field effect the chemical reaction
    process is not well studied

6
Equipment for Experiment
7
Distribution of MFD in High Static Magnetic Field
8
Flow Chart of Experimental
Control pH
9
B0T?Temp80??Adding time of reactant
solution1hr?pH78
B10T?temp80??Adding time of reactant
solution6hrs?pH78
10
Effect of temp. on Shape of sediment
40?
50?
60?
70?
B10T?Adding time of reactant solution6hrs?pH78

11
In Aqueous Solution, the Critical radius of New
Nucleus is
rp-Critical radius of New Nucleus s-Surface
Energy between Particle and Solution ?-Volume
of Solution K- Boltzman Constant T-Temperature
of Solution C-Actual Concentration of Solute
C-Saturation Concentration of Solute When
Equilibium
12
Effect of Adding time of reactant solution on
Shape of sediment
6hrs
2hrs
Adding time of reactant solution
B10T?Temp60??pH78
10hrs
13
Effect of MFD on Shape of sediment
B0.3T
B0.5T
B0.6T
B0.7T
Temp60??Adding time of reactant
solution1h?pH78
14
Effect of MFD on Shape of sediment
B4T
B10T
Temp80 ?t6hPH79
15
Sketch map of the mechanism of effect of Magnetic
Field on nucleation and growth of nano-particle
16
Energy spectrum analysis of sediment
a
b
c
d
17
Composition of Particles
18
X-ray diffraction spectrum
19
Main Phase Composition of Particle
20
TEM Image of Non-Claviform Particle
Bright Image
Dark Image
Electron Diffraction Image
21
TEM Image of Claviform Particle
22
Next Step Work
23
Conclusions
  1. HSMF will effect the nucleation of chemical
    sediment process, and there is a critical MFD,
    Above which the nucleation will grow into
    stick-like or fibre-like
  2. The claviform particle by HSMF shows the
    structure of crystal, while the polygonal
    particle is the mixture of non crystal and
    crystal
  3. The HSMF will not only effect the shape of
    sediment, but also the phase composition

24
Acknowledgement
This work was financial supported by Scientific
Technological Committee of Shanghai Thankful to
sino-German Center for Research Promotion for
financial support to workshop
25
Thank you for your attention
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