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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

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

Yunbo Zhong, Li Zhihua, Zhongming Ren

Shanghai University

slide2

Process of Material in HSMF

Metallic Material

Nano-Material

HSMF

Inorganic Non-metallic Material

Organic or Biological Material

slide3

Methods for Preparation of Nano-particle

1、High Energy Grinding;

2、Evaporation;

3、Co-Precipitation;

4、Sol-Gel;

5、Hydrothermal Preparation;

6、By Plasma;

And so on…………

slide4

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
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;
equipment for experiment

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

Distribution of MFD in

High Static Magnetic Field

flow chart of experimental

(Fe、Mn、Zn)NO3 Mixture

Ammonia Liquid

NH4HCO3Solution

Co-Precipitation

Filtration

Abstersion

Drying

SEM、TEM

Flow Chart of Experimental

Control pH

slide9

B=0T、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
Effect of temp. on Shape of sediment

50℃

40℃

70℃

60℃

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

slide11

In Aqueous Solution, the Critical radius of New Nucleus is

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

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

Effect of MFD on Shape of 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

Effect of MFD on Shape of sediment

B=4T

B=10T

Temp=80 ℃;t=6h;PH=7~9

slide15

Claviform Particle

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

Iron

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

Iron

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
TEM Image of Non-ClaviformParticle

Bright Image

Dark Image

Electron Diffraction Image

slide22

Fibre Nano Particle

Alignment in HSMF

Sintering

Performance Measurement

Next Step Work

conclusions
Conclusions
  • 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

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

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