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Monodisperse magnetic porous silicon dioxide pellet and preparing method thereof

A technology of porous silicon dioxide and silicon dioxide, applied in the directions of silicon dioxide, silicon oxide, iron oxide, etc., can solve the problems of easy disappearance of magnetic properties, high temperature resistance, trouble, etc., and achieve easy operation, stable magnetic properties, and efficient preparation. effect of the method

Inactive Publication Date: 2017-05-24
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The magnetic silica microspheres prepared at present have the following disadvantages: (1) most of the particle diameters are only about several hundred nanometers, and the particle diameter and pore diameter are uncontrollable, the distribution is wide, and the pore structure is uncontrollable, generally non-connected pores, To a certain extent, its application is limited; (2) the structure is mostly core-shell structure, and the magnetic nanoparticles are not uniformly dispersed in the skeleton structure of silica; (3) the magnetic particles are mostly Fe 3 o 4 , it needs to be prepared in advance by co-precipitation method or oil heat method, which is troublesome, not resistant to high temperature, easy to oxidize, and easy to lose magnetism

Method used

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  • Monodisperse magnetic porous silicon dioxide pellet and preparing method thereof
  • Monodisperse magnetic porous silicon dioxide pellet and preparing method thereof
  • Monodisperse magnetic porous silicon dioxide pellet and preparing method thereof

Examples

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Embodiment 1

[0038] In this example, the commercially available monodisperse porous PGMA / EGDMA microspheres with a particle size of 4.54 μm were used as a template to prepare the monodisperse magnetic porous silica microspheres of this example. The specific preparation method is as follows:

[0039] (1) Weigh 20g of monodisperse porous PGMA / EGDMA microspheres with a particle size of 4.54μm and ultrasonically disperse them in 500mL of water, add 20g of sodium sulfite, stir mechanically at 160rpm, react for 24h, and carry out sulfonation; after the reaction, suction filter and wash with water and ethanol respectively 3 times, dry in a 50°C oven for later use.

[0040] (2) Configure Fe 2+ : Fe 3+ Iron source solution with a molar ratio of 1:2: weigh 1.645g FeCl 2 4H 2 O and 4.34 g FeCl 3 ·6H 2 Dissolve O in 20mL water to form an iron source solution. After the iron source solution is evacuated, N 2 Save it for future use. Ultrasonic disperse 0.5 g of the sulfonated PGMA / EGDMA microsphe...

Embodiment 2

[0049] In this example, commercially available monodisperse porous PGMA / EGDMA microspheres with a particle size of 7.42 μm were used as a template to replace the 4.54 μm monodisperse porous PGMA / EGDMA microspheres in Example 1 to prepare monodisperse magnetic porous silica microspheres. The preparation method of this example is compared with Example 1, the difference is that the addition of iron source solution in step (2) is 0.5mL; in step (4), 3g TEOS is dissolved in 10mL ethanol and is made into the ethanol solution of TEOS ; In step (5), 0.06g ceric ammonium nitrate is dissolved in 4mL acetone and is made into ceric ammonium nitrate solution; All the other steps and parameters are the same as in Example 1.

[0050] Using a scanning electron microscope to observe the monodisperse magnetic porous silica microspheres prepared in this example, the results show that this example prepared magnetic porous silica microspheres with uniform size and good monodispersity, and the magne...

Embodiment 3

[0052] In this example, the commercially available monodisperse porous PS / DVB microspheres with a particle size of 6.24 μm were used as a template to prepare the monodisperse magnetic porous silica microspheres of this example. The specific preparation method is as follows:

[0053] (1) Weigh 5g of monodisperse porous PS / DVB microspheres with a particle size of 6.24μm, place them in a three-neck flask, add 50mL of concentrated sulfuric acid, stir well, stir mechanically at 160rpm, react for 24h, and carry out sulfonation; after the reaction, suction filter , washed three times with water and ethanol respectively, and dried in an oven at 50°C for later use.

[0054] (2) Configure Fe 2+ : Fe 3+ Iron source solution with a molar ratio of 1:2: weigh 1.645g FeCl 2 4H 2 O and 4.34 g FeCl 3 ·6H 2 Dissolve O in 20mL water to form an iron source solution. After the iron source solution is evacuated, N 2 Save it for future use. Ultrasonic disperse 0.5 g of PS / DVB microspheres sul...

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Abstract

The invention discloses a monodisperse magnetic porous silicon dioxide pellet and a preparing method thereof. The preparing method of the monodisperse porous silicon dioxide pellet comprises the steps of utilizing a monodisperse magnetic porous macromolecule pellet as a template, generating in situ a magnetic Fe3O4 particle and sol-gelation of a silicon source and using a Fe3O4 particle to oxidize gamma-Fe2O3, forming a magnetic macromolecule-silicon dioxide composite pellet, and then removing the macromolecule template after calcination to obtain the monodisperse magnetic porous silicon dioxide pellet. The preparing method of the monodisperse magnetic porous silicon dioxide pellet is simple in process and easy to operate, and the prepared monodisperse magnetic porous silicon dioxide pellet has the advantages of being homogenous in particle size, controllable in particle diameter and pore diameter, connective in pore, simple in method of introducing magnetic nanoparticles, stable in magnetism and the like.

Description

technical field [0001] The present application relates to the field of monodisperse magnetic porous silica microspheres, in particular to a monodisperse magnetic porous silica microsphere and a preparation method thereof. Background technique [0002] Porous silica has the characteristics of high specific surface area, high mechanical strength, good stability, good biocompatibility and easy modification. Magnetic nanoparticles can be separated from the liquid phase under the action of an external magnetic field, or can be transported to a specific site in a targeted manner. They are widely used in the fields of adsorption separation, catalysis, and targeted drug delivery. Applications are subject to certain restrictions. Combining porous silica and magnetic nanoparticles to prepare composite materials will overcome this shortcoming. The advantages of porous silica and magnetic nanoparticles can be effectively combined, thus having wider practical value. [0003] Magnetic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/34C01B33/12C01G49/06
Inventor 何洁陈继伟任连兵滕超王勇
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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