Preparation of inorganic magnetic material for filling hollow mesoporous silicon dioxide sphere

A silicon dioxide and magnetic material technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve problems such as time-consuming and cumbersome processes

Inactive Publication Date: 2009-07-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But so far, the reported synthesis processes are to synthesize magnetic particles first and then coat mesoporous materials on the outside of the particles, or first synthesize hollow mesoporous spheres and then fill them with magnetic materials, which makes the process cumbersome and time-consuming.

Method used

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  • Preparation of inorganic magnetic material for filling hollow mesoporous silicon dioxide sphere
  • Preparation of inorganic magnetic material for filling hollow mesoporous silicon dioxide sphere
  • Preparation of inorganic magnetic material for filling hollow mesoporous silicon dioxide sphere

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Effect test

Embodiment 1

[0030] First prepare two kinds of reaction solutions: A solution is silicon source, alcohol and surfactant, the specific parameters are 30ml ethanol, 3ml tetraethyl orthosilicate, 1g CTAB; B solution is 0.05M ammonia solution. Second, the preparation of FeCl 2 with FeCl 3 For a solution with a molar ratio of 1:2, add 2ml of iron salt solution to 200ml of B solution to prepare a sol. Quickly add liquid A into the generated sol, reduce the stirring speed, and filter immediately after a light yellow precipitate appears after 3 minutes. After the filtrate was dried at room temperature, it was kept at 600° C. for one hour under the protection of nitrogen. Finally, the brown spherical wall is inlaid with magnetic Fe 3 o 4 hollow mesoporous silica spheres. Such as figure 1 , 5 , 6 shown.

Embodiment 2

[0032] First prepare two kinds of reaction solutions: A solution is silicon source, alcohol and surfactant, the specific parameters are 30ml ethanol, 3ml tetraethyl orthosilicate, 1g surfactant; B solution is 0.05M ammonia solution. Second, the preparation of Fe(NO 3 ) 2 with Fe(NO 3 ) 3 For a solution with a molar ratio of 1:2, add 2ml of iron salt solution to 200ml of B solution to prepare a sol. Quickly add liquid A into the generated sol, reduce the stirring speed, and filter immediately after a light yellow precipitate appears after 3 minutes. After the filtrate was dried at room temperature, it was kept at 600° C. for one hour under the protection of nitrogen. Finally, the brown spherical wall is inlaid with magnetic Fe 3 o 4 hollow mesoporous silica spheres. Change the type of iron salt to make magnetic Fe embedded in the wall of the ball 3 o 4 The hollow mesoporous silica spheres have better morphology. Such as figure 2 shown.

Embodiment 3

[0034] First prepare two kinds of reaction solutions: A solution is silicon source, alcohol and surfactant, the specific parameters are 30ml ethanol, 3ml tetraethyl orthosilicate, 1g CTAB; B solution is 0.05M ammonia solution. Second, the preparation of FeCl 2 with FeCl 3 For a solution with a molar ratio of 1:2, add 2ml of iron salt solution to solution A and stir for 20 minutes, then quickly add it to solution B, reduce the stirring speed, and filter immediately after a light yellow precipitate appears after 3 minutes. After the filtrate was dried at room temperature, it was kept at 600° C. for one hour under the protection of nitrogen. The resulting brown cavity is filled with magnetic Fe 3 o 4 mesoporous silica spheres. Such as image 3 , 6 shown.

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Abstract

The invention relates to a method for preparing an inorganic magnetic material for filling a hollow mesoporous silicon dioxide ball, which comprises the following steps: (1) preparation of two reaction solutions: A solution, 0.05 to 2g of hexadecyl trimethyl ammonium bromide is dissolved into 12 to 70 ml of ethanol, is stirred for 10 minutes for fully dissolving, and is added with 0.5 to 9 ml of ethyl orthosilicate to be stirred fully, wherein a surfactant is hexadecyl trimethyl ammonium bromide; and B solution is 0.01 to 0.4 M of ammonia solution; (2) preparation of ferric salt solution, the mol ratio of ferrous ions to ferric ions of the ferric salt solution is 1:2, and the ferric salt solution is added into the B solution to be prepared into sol; and the volume ratio of the ferric salt solution to the B solution is 1:2,000-1:200; (3) the A solution is added into the sol generated in the step (2), the stirring speed is reduced, the mixed solution is immediately filtered after pale yellow precipitate is generated, and the volume ratio of the A solution to the sol is 1:4-1:10; and (4) the precipitate is dried at room temperature, and is kept for 1 hour at the temperature of 600 DEG C under the protection of nitrogen.

Description

Technical field: [0001] The invention relates to a preparation method of an inorganic magnetic material filled with hollow mesoporous silica spheres, in particular to a composite preparation method of magnetic inorganic nanoparticles / hollow mesoporous silica spheres. It belongs to the technical field of advanced nanocomposite materials. Background technique: [0002] As an important nanomaterial, magnetic nanoparticles have broad application prospects in many fields due to their special magnetic properties. Most of these applications require magnetic particles to have chemical stability, uniform particle size, and good of dispersion. Due to the high specific surface energy of magnetic nanoparticles and the anisotropic dipole moment of the particles, they are easy to agglomerate. Some magnetic particles such as Fe, Fe 3 o 4 easily oxidized to γ-Fe 2 o 3 , resulting in the aggregation and precipitation of particles, and the inability to form a stable dispersion system, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
Inventor 郗杨胡经纬郝维昌王天民
Owner BEIHANG UNIV
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