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Method for preparing silicon dioxide embedded nano composite particles

A technology of composite particles and silica, applied in the direction of magnetic properties of inorganic materials, can solve the problems such as treating the symptoms but not the root cause, complex preparation steps, and large influence on the final product shape, and achieves smooth appearance, increased preparation amount, and narrow particle size distribution. Effect

Inactive Publication Date: 2008-07-02
NANTONG DOUBLE GREAT TEXTILE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method only treats the symptoms but not the root cause, there are still a large amount of .Fe 3 o 4 The nanoparticles are agglomerated together, and the ultrasonic process has a great influence on the morphology of the final product
Therefore, the above use The process of preparing silica-embedded magnetic nanoparticles not only faces complex preparation steps, but also limits the amount of product preparation

Method used

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  • Method for preparing silicon dioxide embedded nano composite particles
  • Method for preparing silicon dioxide embedded nano composite particles
  • Method for preparing silicon dioxide embedded nano composite particles

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: Utilize traditional co-precipitation method to prepare Fe respectively 3 o 4 , Fe 2 o 3 、CoFe 2 o 4 2.2 g of nanoparticles each. After the reaction, the obtained precipitate was separated from the reaction medium by applying an external magnetic field, and washed with water for 3 times.

Embodiment 2

[0019] Embodiment 2: Disperse any fresh nanoparticles prepared in Example 1 in 220mL methanol solution, and make a magnetic fluid suspension with a concentration of 10g / L, and add trimethoxy in a ratio of 0.1 gram per gram of magnetic nanoparticles propenyl silane (MPS), the solution was heated and refluxed for 4 hours, after the solution was cooled to room temperature, the precipitate was centrifuged, and the precipitate was washed alternately with water and ethanol for three cycles, and then the precipitate was dispersed in the ethanol solution to obtain MPS- Magnetic nanoparticles ethanol solution;

Embodiment 3

[0020] Embodiment 3: Disperse any fresh nanoparticles prepared in Example 1 in 220mL aqueous solution, and make a magnetic fluid suspension with a concentration of 10g / L. By the nitrogen degassing method of the prior art, the suspension will Degas for 20 minutes. Then, the prepared magnetic fluid suspension was heated to 80°C, and 3 mL of oleic acid was added dropwise at a stirring speed of 800 rpm, followed by the addition of 1 mL of ammonia water. Leave it for half an hour. Finally, the precipitate was collected by centrifugation, and the precipitate was alternately washed with water and ethanol for three cycles, and the precipitate was dispersed in the ethanol solution to obtain the oleic acid-magnetic nanoparticle ethanol suspension.

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Abstract

The invention is a method for preparing SiO2-coated magnetic nano composite particles, characterized in comprising the steps of: a. firstly preparing magnetic nano particles by codeposition process; b. coating the magnetic nano particles with vinyl acetate or methyl methacrylate, and then hydroxylating to obtain magnetic nano composite particles; c. coating the magnetic nano composite particles with SiO2. By hydroxylation of the magnetic particles, it can increase the maximum addition of magnetic particles in the reacting course, thus increasing the prepared quantity of the composite particles in Stober course, and the obtained composite particles are distributed narrowly and have round appearance, completely reaching the commercialization standard.

Description

1. Technical field [0001] The invention belongs to the field of preparation of magnetic nanocomposite particles, in particular to an improved preparation method of silica-embedded magnetic nanocomposite particles. 2. Background technology [0002] At present, magnetic nanoparticles are being widely used in the biological field: from magnetic separation, drug delivery carrier, tumor hyperthermia to magnetic resonance imaging contrast enhancement agent, among which when it is applied to the separation and enrichment of biological macromolecules such as protein and DNA , it is necessary to improve the surface of magnetic particles. Among various embedding materials, silicon dioxide is the earliest and most widely studied material. Compared with other materials, the non-specific adsorption of silica to biomolecules is small, and the coating can provide hydroxyl functional groups on the surface of magnetic nanoparticles, which facilitates its reaction with silane coupling agents...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/628H01F1/36
Inventor 王志飞何农跃郭雅飞
Owner NANTONG DOUBLE GREAT TEXTILE
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