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Method for fabricating magnetic hollow ball

A hollow sphere and magnetic technology, which is applied in the field of preparation of monodisperse magnetic hollow spheres, can solve the problems of poor uniformity, easy self-coagulation of precursors, and difficult removal, etc., and achieves the effects of simple operation, easy promotion, and short production cycle

Inactive Publication Date: 2009-12-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the sol-gel method on the surface of hollow glass microspheres to prepare barium ferrite hollow spheres, the barium ferrite precursors are easy to self-condense, and it is difficult to remove them with hollow glass microspheres such as templates, and the available hollow glass microspheres The spheres themselves are micron-scale, polydisperse, and poorly homogeneous

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Preparation of monodisperse barium ferrite magnetic hollow spheres with a core diameter of 150 nm and a shell thickness of 10 nm.

[0021] 2. Equipment: 500mL round bottom flask, electric stirrer, heating mantle, 50mL crucible, high temperature atmosphere furnace with maximum working temperature of 1600℃.

[0022] 3. Preparation process:

[0023] (1) Synthesis of monodisperse poly(styrene-co-acrylic acid) submicron template latex particles: sequentially add 300mL water, 30mL styrene, 10mL acrylic acid, and 0.05g sodium chloride into the flask, start stirring, replace the nitrogen, and raise the temperature. After the temperature was raised to 60℃, 20mL of potassium persulfate aqueous solution with a mass fraction of 3% was added dropwise, kept for 24 hours, and finally cooled to room temperature. After centrifugation and cleaning several times, it was dispersed in water to prepare 2%wt poly(styrene). -Co-acrylic) emulsion.

[0024] (2) Prepare a polyethylene glycol aqueo...

Embodiment 2

[0029] 1. Preparation of monodisperse metallic ferromagnetic hollow spheres with a core diameter of 300 nm and a shell thickness of 15 nm.

[0030] 2. Equipment: Same as Example 1.

[0031] 3. Preparation process:

[0032] (1) Synthesis of monodisperse poly(styrene-co-acrylic acid) submicron template latex particles: sequentially add 300mL water, 30mL styrene, 10mL acrylic acid, and 0.05g sodium chloride into the flask, start stirring, replace the nitrogen, and raise the temperature. After the temperature was raised to 60°C, 10 mL of potassium persulfate aqueous solution with a mass fraction of 3% was added dropwise, and kept for 24 hours, and finally cooled to room temperature, centrifuged and washed several times, and dispersed in water to prepare 2% wt poly(styrene). -Co-acrylic) emulsion.

[0033] (2) Prepare a polyethylene glycol aqueous solution of ferric nitrate, where [Fe 3+ ] = 0.10mol / L, [PEG1000] / [NO 3 - ]=30; Add the above solution dropwise to an equal volume of 0.30m...

Embodiment 3

[0038] 1. Preparation of monodisperse spinel-type magnetic hollow spheres with a core diameter of 300 nm and a shell thickness of 30 nm.

[0039] 2. Equipment: Same as Example 1.

[0040] 3. Preparation process:

[0041] (1) Same as Example 1.

[0042] (2) Prepare a polyethylene glycol aqueous solution of iron nitrate and nickel nitrate, where [N i 2+ ] = 0.010mol / L, [Fe 3+ ] = 0.020mol / L, [PEG6000] / [NO 3 - ]=25; Add the above solution dropwise to an equal volume of 0.20mol / L NaOH aqueous solution at room temperature, and stir while adding dropwise. After the dropwise addition, continue stirring for 30 minutes. Centrifuge the product and pour out the liquid, and then repeatedly wash with water. Centrifuge and redisperse in water to prepare a suspension with a mass concentration of ~0.3% for later use.

[0043] (3) Preparation of core-shell nanocomposite particles: the above-mentioned ~0.3% concentration of nickel ferrite precursor suspension was slowly added to 1.0% P(St-co-AA) ...

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Abstract

The present invention is a preparation method of magnetic hollow sphere. The method is as follows: using polymer latex particles rich in carboxyl groups on the surface as a template, and using acid-alcohol interaction to coat the inorganic precursor particles rich in hydroxyl groups on the surface of the template particles to form polymer-inorganic precursor core-shell Nanocomposite particles, and then heat treatment to obtain magnetic hollow spheres. The method has a wide range of material applicability and may also be used for the preparation of other mono-, binary or multi-component monodisperse inorganic hollow spheres, and also has the advantages of simple operation, short production cycle, easy production conditions and easy popularization.

Description

Technical field [0001] The invention relates to a preparation method of magnetic hollow spheres, in particular to a preparation method of submicron monodisperse magnetic hollow spheres. Background technique [0002] The preparation of inorganic hollow spheres usually adopts the colloidal particle template method, that is, the submicron-scale latex particles are used as templates, and the inorganic precursors are coated on the template particles through layer-by-layer electrostatic self-assembly method, sol-gel method, uniform precipitation method, etc. Then, the template particles are removed by pyrolysis or dissolution, and the corresponding inorganic submicron hollow spheres are obtained. Many kinds of inorganic hollow spheres have been prepared by this method, such as TiO 2 , SiO 2 However, due to the special difficulty of preparation, the preparation of monodisperse submicron hollow ferrite spheres has not yet been reported, and the research related to the preparation of poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/00B01J13/02C04B35/622B29D22/00
Inventor 官建国甘治平闫共芹张清杰
Owner WUHAN UNIV OF TECH
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