Multi-scale uniform and single-dispersion magnetic microsphere and preparation method thereof

A magnetic microsphere, monodisperse technology, applied in the field of nano-composite, can solve the problems such as the difficulty of regulating particles, and achieve the effects of low preparation cost, easy industrial application and promotion, and cheap and easy-to-obtain raw materials

Active Publication Date: 2015-04-22
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still a difficult problem to further c

Method used

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  • Multi-scale uniform and single-dispersion magnetic microsphere and preparation method thereof
  • Multi-scale uniform and single-dispersion magnetic microsphere and preparation method thereof
  • Multi-scale uniform and single-dispersion magnetic microsphere and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0042] Example 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 polytetrafluoroethylene liner, and magnetically stirred for 30 minutes. Add 12 mmol sodium acetate (the ratio of the amount of alkali to metal salt substance is 4) and 20 mL of ethylene glycol into the beaker and stir for 30 minutes, then transfer to the inner lining and mix and stir for 2.0 hours. Finally, put the inner lining in a stainless steel kettle and react for 12 hours at 200°C. After cooling, centrifuge and wash (first with water and ethanol for three centrifugal washing, centrifugal speed 1500 rpm, centrifugal time 5 minutes each time.), finally water and ethanol Separate and wash by magnetic separation until the solution is clear, and then dry at 60°C for 6 hours to obtain the required monodisperse magnetic microspheres. The resulting product has a morphology as observed under the scanning electron microscope image 3 As shown,...

Example Embodiment

[0044] Example 2:

[0045] Same steps as in Example 1, but FeCl 3 ·6H 2 O is 20mmol, sodium acetate is 80mmol (the ratio of the amount of alkali to metal salt substance 4), and the morphology of the resulting product observed under the scanning electron microscope is as Figure 4 As shown, the average particle size is 1233 nm. The specific surface area of ​​the resulting microspheres is 0.94m 2 ·G -1 .

Example Embodiment

[0046] Example 3:

[0047] Same steps as in Example 1, but FeCl 3 ·6H 2 O is 30mmol, sodium acetate is 120mmol (the ratio of the amount of alkali to metal salt is 4), and the morphology of the resulting product observed under the scanning electron microscope is as Figure 5 As shown, the particle size is not uniform (approximately 0.5-1.5 μm) and 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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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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