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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 easy self-phase aggregation, poor uniformity, and difficult removal of precursors, and achieve the effects of easy promotion, simple operation, and short production cycle

Inactive Publication Date: 2006-04-19
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. Prepare 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 a maximum working temperature of 1600°C.

[0022] 3. Preparation process:

[0023] (1) Synthesis of monodisperse poly(styrene-co-acrylic acid) submicron template latex particles: add 300mL water, 30mL styrene, 10mL acrylic acid, and 0.05g sodium chloride into the flask successively, start stirring, and heat up after replacing nitrogen. After the temperature rose to 60°C, 20 mL of potassium persulfate aqueous solution with a mass fraction of 3% was added dropwise, and kept warm for 24 hours, and finally cooled to room temperature, centrifugally washed several times, dispersed in water to form 2%wt poly(styrene -co-acrylic acid) emulsion.

[0024] (2) prepare the polyethylene glycol aqueous solution of barium ...

Embodiment 2

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

[0030] 2. Equipment: with embodiment 1.

[0031] 3. Preparation process:

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

[0033] (2) prepare the polyethylene glycol aqueous solution of ferric nitrate, wherein [Fe 3+ ]=0.10mol / L, [PEG1000] / [NO 3 -]=30; at normal temperature, the above solution is added dropwise to...

Embodiment 3

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

[0039] 2. Equipment: with embodiment 1.

[0040] 3. Preparation process:

[0041] (1) With embodiment 1.

[0042] (2) prepare the polyethylene glycol aqueous solution of ferric nitrate and nickel nitrate, wherein [Ni 2+ ]=0.010mol / L, [Fe 3+ ]=0.020mol / L, [PEG6000] / [NO 3 - ]=25; Add the above solution dropwise into an equal volume of 0.20mol / L NaOH aqueous solution at room temperature, stir while adding dropwise, continue stirring for 30 minutes after the dropwise addition, centrifuge the product, pour out the liquid, and wash it repeatedly with water , centrifuged, and re-dispersed in water to make a suspension with a mass concentration of ~0.3% for later use.

[0043] (3) Preparation of core-shell nanocomposite particles: Slowly add the above ~0.3% nickel ferrite precursor suspension into the 1.0% P(St-co-AA) emulsion while stirring until...

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Abstract

In the invention, particles of polymer emulsion rich in carboxyl on surface are as template. Using interaction between acid and alcohol coats inorganic premonitory particles rich in hydroxy radical on surface to particles of template so as to form Nano compound particles of polymer- inorganic premonitory nucleocapsid. Magnetic hollow balls are obtained after heat treatment for compound particles. The method possesses wide applicability for materials including single element, dual and multiple elements inorganic hollow ball in monodisperse. Advantages are: simple operation, short production cycle, easy of preparing production condition and easy of popularization.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(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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