Microsphere with multiple magnetic nano cores@gaps@porous shell structures and preparation method thereof

A magnetic nano-core technology, applied in the preparation of microspheres, the magnetism of organic materials/organic magnetic materials, nanotechnology, etc., can solve complex preparation methods, require high-temperature calcination, inert gas protection, and limit large-scale production and application and other problems, to achieve the effect of simple preparation process

Inactive Publication Date: 2015-04-15
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the microspheres prepared at present are microspheres with a single magnetic core inside, and the multi-core structure can greatly increase the active sites and contact area of ​​the core compared with a single core, thereby improving the performance of the microspheres. The preparation process of quasi-multimagnetic core microspheres is extremely complicated, and there is no relevant report so far
Moreover, most of the existing methods for preparing microspheres with a single magnetic core structure use many organic chemical substances such as crosslinking agents, emulsifiers, stabiliz

Method used

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  • Microsphere with multiple magnetic nano cores@gaps@porous shell structures and preparation method thereof
  • Microsphere with multiple magnetic nano cores@gaps@porous shell structures and preparation method thereof
  • Microsphere with multiple magnetic nano cores@gaps@porous shell structures and preparation method thereof

Examples

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Effect test

Embodiment 1

[0018] Dissolve 2g of ferric chloride in 100ml of deionized water, disperse 5g of chlorella dry powder in the prepared ferric chloride solution, place in a constant temperature water bath at 25°C and shake at 160rpm for 6h, then centrifuge the suspension at 5000rpm After 10 minutes, the obtained precipitate was repeatedly washed and centrifuged with deionized water for 4 times, and then the centrifugal precipitate was dispersed in 80ml of 8% sodium hydroxide solution and placed in a hydrothermal reaction kettle with a volume of 100ml and reacted at 105°C for 1h , after the reaction kettle is naturally cooled, take the suspension and centrifuge at 9000rpm for 8min, wash repeatedly with deionized water and centrifuge the precipitate 5 times, then disperse the precipitate in 80ml of deionized aqueous solution, and wash with 0.5mol / L hydrochloric acid or 0.5mol / L sodium hydroxide adjusted the pH of the system to be 9, and placed in a hydrothermal reactor with a volume of 100ml and ...

Embodiment 2

[0020] Dissolve 1g of ferric nitrate in 100ml of deionized water, disperse 5g of chlorella dry powder in the prepared ferric nitrate solution, place in a constant temperature water bath at 25°C and shake at 150rpm for 12h, then centrifuge the suspension at 5000rpm for 10min, The obtained precipitate was repeatedly washed and centrifuged with deionized water for 4 times, and then the centrifugal precipitate was dispersed in 80ml of 10% potassium hydroxide solution and placed in a hydrothermal reaction kettle with a volume of 100ml and reacted for 1h at 105°C. After the reaction kettle is naturally cooled, take the suspension and centrifuge it at 9000rpm for 8 minutes, wash it repeatedly with deionized water and centrifuge the precipitate 5 times, then disperse the precipitate in 80ml deionized aqueous solution, and wash it with 0.5mol / L hydrochloric acid or 0.5mol / L sodium hydroxide to adjust the pH of the system to 9, and place it in a hydrothermal reactor with a volume of 100...

Embodiment 3

[0022] Dissolve 6g of ferric ammonium citrate in 100ml of deionized water, disperse 5g of chlorella dry powder in the prepared ferric ammonium citrate solution, place it in a constant temperature water bath at 25°C and shake at 150rpm for 24h, then put the suspension in Centrifuge at 5000rpm for 10min, wash and centrifuge the obtained precipitate repeatedly with deionized water for 4 times, then disperse the centrifuged precipitate in 80ml of 10% ammonia solution and put it in a hydrothermal reaction kettle with a volume of 100ml for 2h at 105°C , after the reaction kettle is naturally cooled, take the suspension and centrifuge at 9000rpm for 8min, wash repeatedly with deionized water and centrifuge the precipitate 5 times, then disperse the precipitate in 80ml of deionized aqueous solution, and wash with 0.5mol / L hydrochloric acid or 0.5mol / L sodium hydroxide adjusted the pH of the system to be 10, and placed in a hydrothermal reaction kettle with a volume of 100ml to react fo...

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Abstract

The invention relates to a microsphere with multiple magnetic nano cores@gaps@porous shell structures and a preparation method thereof. The microsphere structure is characterized in that a porous hollow shell contains a plurality of magnetic nano cores. In the preparation method, iron (III) is taken as the single iron precursor, the spherical cell wall of unicellular algae is taken as the precursor of porous microsphere wall, the substances in the algae cells are used to replace chemical reagents to carry out reactions, and a hydrothermal method with mild conditions is performed to prepare the microsphere with multiple magnetic nano cores@gaps@porous shell structures. The preparation method is simple; a microsphere, which has a complicated structure composed of a porous hollow shell and a plurality of magnetic cores, can be produced without a template; the preparation process is green and environment-friendly; no organic reagent is added, and the obtained microsphere has the advantages of excellent magnet-response performance and large loading space.

Description

technical field [0001] The invention relates to a microsphere with a multi-magnetic nano core void porous shell structure and a preparation method thereof. Background technique [0002] Magnetic microspheres with a bell structure or egg yolk shell structure, due to their unique magnetic core-gap shell structure, exhibit excellent magnetic response capability, large internal space for loading functional guest substances, and the permeability and environment of the sphere wall. Response characteristics have been widely concerned and applied in the fields of material separation and purification, targeted drug delivery, nuclear magnetic imaging, and catalysis. Most of the microspheres prepared at present are microspheres with a single magnetic core inside, and the multi-core structure can greatly increase the active sites and contact area of ​​the core compared with a single core, thereby improving the performance of the microspheres. The preparation process of quasi-multimagne...

Claims

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Application Information

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IPC IPC(8): B01J13/02C01G49/08B82Y40/00H01F1/42
Inventor 潘纲毕磊
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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