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A multi-scale, uniform, monodisperse magnetic microsphere and its preparation method

A magnetic microsphere, monodisperse technology, applied in the field of nanocomposite, can solve the problem of difficulty in regulating particles, and achieve the effects of low preparation cost, uniform particles, and easy industrial application and promotion.

Active Publication Date: 2017-02-22
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still a difficult problem to further control the size of particles in a larger scale range.

Method used

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  • A multi-scale, uniform, monodisperse magnetic microsphere and its preparation method
  • A multi-scale, uniform, monodisperse magnetic microsphere and its preparation method
  • A multi-scale, uniform, monodisperse magnetic microsphere and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 3mmol FeCl 3 ·6H 2 O, 20 mL of ethylene glycol, 0.374 g of polyacrylic acid, and 0.69 mL of water were added to the Teflon liner and stirred magnetically for 30 min. Add 12mmol sodium acetate (the ratio of alkali to metal salt is 4) and 20mL ethylene glycol into the beaker and stir for 30 minutes, then transfer to the inner liner and mix for 2.0h. Finally, put the inner liner in a stainless steel kettle and react at 200°C for 12 hours. After cooling, wash by centrifugation (firstly wash with water and ethanol three times respectively, the centrifugal speed is 1500 rpm, and the centrifugation time is 5 minutes each time.), and finally water and ethanol Magnetic separation, separation and washing until the solution is clear, and drying at 60°C for 6 hours to obtain the desired monodisperse magnetic microspheres. The morphology of the obtained product observed under the scanning electron microscope is as follows: image 3 As shown, the average particle size is 904 nm. ...

Embodiment 2

[0045] Same as embodiment 1 step, but FeCl 3 ·6H 2 O is 20mmol, and sodium acetate is 80mmol (alkali and the ratio of the amount of metal salt substance 4), and the appearance that gained product observes under scanning electron microscope is as follows Figure 4 As shown, the average particle size is 1233 nm. The specific surface area of ​​the obtained microspheres is 0.94m 2 g -1 .

Embodiment 3

[0047] Same as embodiment 1 step, but FeCl 3 ·6H 2 O is 30mmol, and sodium acetate is 120mmol (the ratio of the amount of alkali and metal salt substance is 4), and the morphology of the obtained product observed under the scanning electron microscope is as follows Figure 5 As shown, the particle size is not uniform (about 0.5-1.5 μm), and the agglomeration is serious.

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Abstract

The invention discloses a multi-scale uniform and single-dispersion magnetic microsphere and a preparation method of the multi-scale uniform and single-dispersion magnetic microsphere. The multi-scale uniform and single-dispersion magnetic microsphere comprises spinel structure ferrite doped with transition metal elements, the microsphere is a polycrystal micro-nano sphere which is formed by nanocrystalline in an aggregation mode, the diameter of the microsphere ranges from 20nm to 1.23 micrometers, the specific surface area of the microsphere ranges from 0.94 m<2>*g<-1> to 17.31 m<2>*g<-1>, and the size of the nanocrystalline ranges from 9.2nm to 25.8nm. A mixed solvothermal method is adopted, and the size and the composition of particles can be adjusted through adjustment of the volume fraction of water or the ratio of iron to other transition metal salt. According to the preparation method, raw materials are low in price, and can be easily obtained, the cost is low, the technology is simple, the requirement for equipment is low, efficiency is high, and popularization is easy; the multi-scale uniform and single-dispersion magnetic microsphere has the advantages that single dispersion and uniformity are good, and the size and the composition can be adjusted; the multi-scale uniform and single-dispersion magnetic microsphere can have the broad application prospect in the fields such as the magneto-rheological field, the magnetic separation field, the catalysis field, the electrode material field, the pigment field, the high-density magnetic recording material field and the medical diagnosis field.

Description

technical field [0001] The invention relates to the field of nanocomposite technology, in particular to a simple method for preparing multi-scale, uniform and monodisperse magnetic nano-micro materials. Background technique [0002] In recent years, monodisperse magnetic nanomaterials with tunable size and morphology have attracted much attention due to their scientific and technological importance. These nanomaterials have many novel physical and chemical properties such as sound, light, electricity, heat, and magnetism, and have broad applications in the fields of magnetorheology, magnetic separation, catalysis, electrode materials, pigments, high-density magnetic recording materials, and medical diagnosis. prospect. These materials can also be used as building blocks for the preparation of photonic crystals, drug release, and chemical sensing. Currently, methods for synthesizing uniform and monodisperse magnetic particles include template self-assembly, organic phase sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/36B01J13/02
Inventor 童国秀刘云吴文华吕天喜
Owner ZHEJIANG NORMAL UNIVERSITY
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