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Magnetic silicon dioxide compound microballoon of core-shell structure and preparation method thereof

A technology of silicon dioxide and composite microspheres, applied in the preparation of microspheres, microcapsule preparations, magnetic properties of inorganic materials, etc. The problem of low saturation strength, etc., achieves the effect of high stability and simple preparation method

Inactive Publication Date: 2012-04-04
EMERGING THERAPEUTICS SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic saturation strength of the silica composite microspheres obtained by these two methods is not high, and the latter method makes the post-treatment process cumbersome due to the use of a large amount of emulsifier
The methods mentioned above all use Fe 3 o 4 Nanoparticles coated with silica, the magnetic properties, especially the magnetic saturation strength, cannot meet many practical needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The polyacrylonitrile microspheres with a particle diameter of 300nm are dispersed in the dispersion liquid N, N-dimethylformamide, FeCl 3 Add it into the dispersion liquid, react at 40°C for 10 hours, then add excess sodium nitrate, keep the temperature and continue the reaction for 16 hours. After the reaction is finished, the reaction solution is precipitated with deionized water, the precipitated solution is suction-filtered, washed three times with deionized water, and the obtained polymer microspheres containing iron ions are vacuum-dried for future use. The whole system is calculated by weight, polyacrylonitrile microspheres account for 5%, FeCl 3 Accounting for 10%, sodium nitrate accounts for 30%, and the rest is ethanol, and its total weight satisfies 100%.

[0024] Dissolve the emulsifier SDS in water to make an aqueous solution, add the above-mentioned polymer microspheres containing iron ions, and add a certain amount of ethanol after ultrasonic...

Embodiment 2

[0026] Embodiment 2: the polyacrylonitrile microsphere that particle diameter is 500nm is dispersed in dispersion liquid ethanol, Fe(NO 3 ) 3 Add it into the dispersion liquid, react at 60°C for 12 hours, then add excess sodium nitrate, keep the temperature and continue the reaction for 36 hours. After the reaction is finished, the reaction solution is precipitated with deionized water, the precipitated solution is suction-filtered, washed three times with deionized water, and the obtained polymer microspheres containing iron ions are vacuum-dried for future use. The whole system is calculated by weight, polyacrylonitrile microspheres account for 5%, Fe(NO 3 ) 3 Accounting for 20%, sodium nitrate accounts for 30%, and the rest is toluene, and its total weight meets 100%.

[0027] Dissolve the emulsifier SDS in water to form an aqueous solution, add the polymer microspheres containing iron ions obtained above, and add a certain amount of isopropanol after ultrasonic dispersi...

Embodiment 3

[0029] Example 3: The polyacrylonitrile-polystyrene copolymer microspheres with a particle size of 1 μm are dispersed in the dispersion liquid toluene, and the CoCl 2 Add it into the dispersion liquid, react at 80°C for 16 hours, then add excess sodium nitrite, keep the temperature and continue the reaction for 24 hours. After the reaction is finished, the reaction solution is precipitated with deionized water, the precipitated solution is suction-filtered, washed three times with deionized water, and the obtained polymer microspheres containing cobalt ions are vacuum-dried for future use. The whole system is calculated by weight, polyacrylonitrile-polystyrene copolymer microspheres account for 2%, CoCl 2 Accounting for 30%, sodium nitrate accounts for 40%, and the rest is N, N-dimethylformamide, and its total weight meets 100%.

[0030] Dissolve the emulsifier SDS in water to make an aqueous solution, add the polymer microspheres containing cobalt ions obtained above, and ad...

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Abstract

The invention relates to a magnetic silicon dioxide compound microballoon of a core-shell structure and a preparation method thereof. The compound microballoon takes a metallic ion complexing polymer microballoon as a core, and then ortho-silicate alkyl ester is taken as a precursor, and the silicon dioxide compound microballoon with the core-shell structure is prepared by adopting a gel-sol method, and the magnetic silicon dioxide compound microballoon is obtained by pyrolyzing the compound microballoon; wherein, the core is a metallic nano-particle / carbon compound microballoon, and the shell is the silicon dioxide. The method is simple and effective, and the preparation is convenient; therefore, the method is a novel method for preparing the magnetic silicon dioxide compound microballoon of the core-shell structure.

Description

technical field [0001] The invention relates to a magnetic silicon dioxide composite microsphere with a core-shell structure and a preparation method thereof. Background technique [0002] Multi-component composite microspheres can be composed of the same or completely different substances, which provides a technical guarantee for the combination of functions between different substances. The materials prepared by design can have the characteristics of each component at the same time, such as optical, electrical, magnetic and other characteristics, so as to realize the simultaneous application of multiple functions in a single system, which has extensive scientific and engineering significance. Among them, superparamagnetic composite microspheres not only have the characteristics of large specific surface area and easy adsorption of ordinary microspheres, but also have the magnetic field responsiveness of inorganic magnetic materials, and can be easily and quickly separated ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02H01F1/09
Inventor 褚轶雯汪长春
Owner EMERGING THERAPEUTICS SHANGHAI CO LTD
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