Method for preparing magnetic mesoporous silica composite nanoparticles of yolk-eggshell structure

A technology of mesoporous silica and composite nanoparticles, applied in the directions of silica, silicon oxide, ferrous oxide, etc., can solve the problems of complex process, high synthesis cost, and inability to effectively control structural parameters, etc. Achieve the effect of easy availability of raw materials, high specific surface area, and adjustable cavity size

Inactive Publication Date: 2019-10-22
BENGBU COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many methods for synthesizing magnetic porous silica composite nanoparticles with a hole structure, among which the template method is the most common, but most of the synthesis methods have the following disadvantages: on the one hand, the synthesis cost is high and the process is complicated; on the other hand, Unable to achieve simple and effective control over its structural parameters

Method used

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  • Method for preparing magnetic mesoporous silica composite nanoparticles of yolk-eggshell structure
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  • Method for preparing magnetic mesoporous silica composite nanoparticles of yolk-eggshell structure

Examples

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Embodiment 1

[0027] The preparation method of the magnetic mesoporous silica composite nanoparticles of egg yolk-eggshell structure in this example is as follows:

[0028] Step 1, the average particle diameter is the magnetic Fe of 80nm 3 o 4 Put 0.050g of nanoparticles in a three-necked flask, add 25mL of deionized water and 50mL of absolute ethanol, and ultrasonically disperse for 10min to obtain Fe 3 o 4 Dispersions;

[0029] Step 2, in Fe 3 o 4 In the dispersion liquid, add 0.2003g resorcinol and 1.83mL formaldehyde solution with a mass concentration of 37% while stirring, and then add ammonia water with a mass concentration of 25% to adjust the pH to 9-10, and the obtained system A is reacted at 25°C 24h; after the reaction, centrifuged, washed with absolute ethanol for 3 times, and vacuum-dried at 70°C for 12h to obtain the phenolic resin-wrapped Fe 3 o 4 Nanoparticles, labeled RF@Fe 3 o 4 Nanoparticles;

[0030] Step 3. Put RF@Fe 3 o 4 Put 0.05g of nanoparticles in a thr...

Embodiment 2

[0033] In this example, magnetic mesoporous silica composite nanoparticles with egg yolk-eggshell structure were prepared according to the same method as in Example 1, the only difference being that the dosages of resorcinol and formaldehyde solutions in step 2 were 0.2507g and 2.29mL respectively .

Embodiment 3

[0035] In this example, magnetic mesoporous silica composite nanoparticles with egg yolk-eggshell structure were prepared according to the same method as in Example 1, the only difference being that the dosages of resorcinol and formaldehyde solutions in step 2 were 0.4190 g and 4.60 mL, respectively. .

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Abstract

The invention discloses a method for preparing magnetic mesoporous silica composite nanoparticles of a yolk-eggshell structure. The method comprises the following steps: by taking magnetic Fe3O4 nanoparticles as a core, and formaldehyde and resorcinol as carbon sources, implementing a copolymerization reaction to coat surfaces of the magnetic Fe3O4 nanoparticles by a generated phenolic resin; implementing a sol-gel technique to coat the surface of the phenolic resin by mesoporous silica; finally implementing roasting to remove the phenolic resin, thereby obtaining the magnetic mesoporous silica composite nanoparticles of the yolk-eggshell structure. The preparation method disclosed by the invention is simple to operate and easy in raw material obtaining, the prepared magnetic mesoporous silica composite nanoparticles of the yolk-eggshell structure are rich in mesoporous structures on surfaces, have large specific surface areas and adjustable cavity sizes and micro structures, and havewide application prospects in fields such as catalysis, adsorption and drug delivery.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a method for preparing magnetic mesoporous silicon dioxide composite nanoparticles with egg yolk-eggshell structure. Background technique [0002] In recent years, with the continuous deepening of research on porous silica nanomaterials, porous silica composite nanoparticles with different structures, morphologies and functionalizations have been prepared, and the synthesis technology of porous silica composite nanoparticles has also been developed. Continuous improvement. Compared with traditional mesoporous silica, porous silica composite nanoparticles with cavity structure (ring-bell type, egg yolk-eggshell type) have a larger storage space, and various functional nanomaterials can be assembled in the cavity, At the same time, it also has the advantages of high specific surface area and good thermal stability, so it has been widely concerned. As a carrier, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C01B33/12B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/12C01G49/08C01P2002/72C01P2004/04C01P2004/84C01P2006/10C01P2006/17
Inventor 陆诚信刘正华陈庆伦曹勇金效齐
Owner BENGBU COLLEGE
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