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. Process of Material in HSMF. Metallic Material. Nano-Material. HSMF. Inorganic Non-metallic Material. Organic or Biological Material.

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Preparation of nano ferrite particle by chemical way in high static magnetic field hsmf l.jpg

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

Yunbo Zhong, Li Zhihua, Zhongming Ren

Shanghai University


Slide2 l.jpg

Process of Material in HSMF Static Magnetic Field(HSMF)

Metallic Material

Nano-Material

HSMF

Inorganic Non-metallic Material

Organic or Biological Material


Slide3 l.jpg

Methods for Preparation of Nano-particle Static Magnetic Field(HSMF)

1、High Energy Grinding;

2、Evaporation;

3、Co-Precipitation;

4、Sol-Gel;

5、Hydrothermal Preparation;

6、By Plasma;

And so on…………


Slide4 l.jpg

Several Questions About Preparation of Nano Material by Chemical Way in HSMF

  • Will Magnetic Field Effect the Process of Chemical Reaction?

  • Will Magnetic Field Effect the Process of Sediment/nucleation of Nano Particle?

  • Will Magnetic Field Effect the Growth of the Nano Particle?

  • Will Magnetic Field Effect the Performance of Nano Material?


Why select ferrite l.jpg
Why select Ferrite Chemical Way in HSMF

  • 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;


Equipment for experiment l.jpg

Mixture of Iron Nitrate, Manganese Nitrate and Zinc Nitrate Solution

Ammonia

Thermocouple

Nitrogen

PID Temperature

Controller

Quartz Pipe

pH Meter

pH Probe

Buffer

Solution

Heater

Superconductive Coil

Heat Resistant Fibre

Water-cooling Pipe

Superconductive Magnet

Equipment for Experiment


Slide7 l.jpg

Distribution of MFD in Solution

High Static Magnetic Field


Flow chart of experimental l.jpg

(Fe、Mn、Zn)NO Solution3 Mixture

Ammonia Liquid

NH4HCO3Solution

Co-Precipitation

Filtration

Abstersion

Drying

SEM、TEM

Flow Chart of Experimental

Control pH


Slide9 l.jpg

B=0T Solution、Temp=80℃、Adding time of reactant solution=1hr、pH=7~8

B=10T、temp=80℃、Adding time of reactant solution=6hrs、pH=7~8


Effect of temp on shape of sediment l.jpg
Effect of temp. on Shape of sediment Solution

50℃

40℃

70℃

60℃

B=10T、Adding time of reactant solution=6hrs、pH=7~8


Slide11 l.jpg

In Aqueous Solution, the Critical radius of New Nucleus is Solution

rp-Critical radius of New Nucleus;

σ-Surface Energy between Particle and Solution;

υ-Volume of Solution;

K- Boltzman Constant;

T-Temperature of Solution;

C-Actual Concentration of Solute;

C*-Saturation Concentration of Solute When Equilibium;


Slide12 l.jpg

Effect of Adding time of reactant solution on Shape of sediment

6hrs

2hrs

Adding time of reactant solution

B=10T、Temp=60℃、pH=7~8

10hrs


Slide13 l.jpg

Effect of MFD on Shape of sediment sediment

B=0.3T

B=0.5T

B=0.6T

B=0.7T

Temp=60℃、Adding time of reactant solution=1h、pH=7~8


Slide14 l.jpg

Effect of MFD on Shape of sediment sediment

B=4T

B=10T

Temp=80 ℃;t=6h;PH=7~9


Slide15 l.jpg

Claviform Particle sediment

Solution

Aggregate Particle

High static magnetic field

Without magnetic field

Critical magnetic field

Sketch map of the mechanism of effect of Magnetic Field on nucleation and growth of nano-particle



Slide17 l.jpg

Iron sediment

Atomic

%

Maganese

Atomic

%

Zinc

Atomic

%

Fe:Mn

Fe:Zn

14.19

17.72

1.30

0.8

10.91

21.14

18.30

2.32

1.155

9.112

c-Block

Particle

22.75

5.85

0.03

3.889

758.33

a-Claviform Particle

d-Block

Particle

22.91

5.08

0.66

4.51

34.71

b-Claviform Particle

Composition of Particles



Main phase composition of particle l.jpg

Iron sediment

Manganese

Zinc

0T

Iron Tetroxide

Manganese Tetroxide

None

10T

Iron Trioxide

Manganese Trioxide

Zinc Ferrite

Main Phase Composition of Particle


Tem image of non claviform particle l.jpg
TEM Image of Non-Claviform sedimentParticle

Bright Image

Dark Image

Electron Diffraction Image



Slide22 l.jpg

Fibre Nano Particle sediment

Alignment in HSMF

Sintering

Performance Measurement

Next Step Work


Conclusions l.jpg
Conclusions sediment

  • 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;

  • The claviform particle by HSMF shows the structure of crystal, while the polygonal particle is the mixture of non crystal and crystal;

  • The HSMF will not only effect the shape of sediment, but also the phase composition;


Slide24 l.jpg

Acknowledgement sediment

This work was financial supported by Scientific & Technological Committee of Shanghai;

Thankful to sino-German Center for Research Promotion for financial support to workshop



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