Preparation method of silicon-coated nano magnetic spheres

A technology of silicon nano and magnetic balls, applied in nanotechnology, nanotechnology, inductor/transformer/magnet manufacturing, etc., can solve the problems of limited development and utilization, easy agglomeration of magnetic balls, poor repeatability, etc.

Active Publication Date: 2018-03-06
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the common disadvantages of limited preparation per unit volume, complex process control, and poor repeatability, resulting in high preparation costs, which severely limit their further development and utilization.
For example, the conventional TEOS sol-gel method uses ammonia water to catalyze the hydrolysis of ethyl orthosilicate to directly coat the silicon layer in the alcohol-water system. The magnetic balls in the system are easy to agglomerate, the concentration of magnetic balls is difficult to increase, and the production cost is extremely high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of silicon-coated nano-magnetic spheres, comprising the following steps:

[0026] (1) Dissolve 1.197g of arginine in a three-necked flask filled with 1000mL of deionized water, stir in a water bath at 50°C, then add 71.5g of ethyl orthosilicate to the three-necked flask, and continue stirring for 24 hours to obtain silicon spheres solution, stored in a 4°C refrigerator for later use;

[0027] (2) Add 32.4g of ferric chloride hexahydrate and 98.44g of anhydrous sodium acetate into a stainless steel reactor, then add 30g of PEG 2000 and 1200mL of diethylene glycol to form a reaction solution, and the trivalent The iron ion concentration is 0.1mol / L, the concentration of PEG 2000 is 25mg / mL, mechanically stir well, seal the stainless steel reaction vessel, and react at 190°C for 4h;

[0028] (3) Take out the stainless steel reaction kettle that has been reacted in step (2), cool it at room temperature, pour out the reaction solution, separate the gene...

Embodiment 2

[0033] A preparation method of silicon-coated nano-magnetic spheres, comprising the following steps:

[0034] (1) Dissolve 1.197g of arginine in a three-necked flask filled with 1000mL of deionized water, stir in a water bath at 70°C, then add 71.5g of ethyl orthosilicate to the three-necked flask, and continue stirring for 8 hours to obtain silicon spheres solution, stored in a 4°C refrigerator for later use;

[0035] (2) Add 108.2g of ferric chloride hexahydrate and 98.44g of anhydrous sodium acetate into a stainless steel reactor, then add 30g of PEG 2000 and 1200mL of diethylene glycol to form a reaction solution, and the trivalent The concentration of iron ions is 0.33mol / L, the concentration of PEG 2000 is 25mg / mL, mechanically stir well, seal the stainless steel reaction vessel, and react at 190°C for 12h;

[0036] (3) Take out the stainless steel reaction kettle that has been reacted in step (2), cool it at room temperature, pour out the reaction solution, separate th...

Embodiment 3

[0041] A preparation method of silicon-coated nano-magnetic spheres, comprising the following steps:

[0042] (1) Dissolve 1.197g of arginine in a three-necked flask filled with 1000mL of deionized water, stir in a water bath at 70°C, then add 357.5g of ethyl orthosilicate to the three-necked flask, and continue stirring for 48h to obtain silicon spheres solution, stored in a 4°C refrigerator for later use;

[0043] (2) Add 108.12g ferric chloride hexahydrate and 98.44g anhydrous sodium acetate to a stainless steel reactor, then add 30g PEG 2000, 400mL ethylene glycol and 800mL diethylene glycol to form a reaction solution, and react The concentration of ferric ion in the liquid is 0.33mol / L, the concentration of PEG 2000 is 25mg / mL, mechanically stir well, seal the stainless steel reaction vessel, and react at 190°C for 12h;

[0044] (3) Take out the stainless steel reaction kettle that has been reacted in step (2), cool it at room temperature, pour out the reaction solution...

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Abstract

The invention discloses a preparation method of silicon-coated nano magnetic spheres. Magnetic spheres adsorbing silicon spheres are obtained through preparing a silicon sphere solution containing silicon dioxide nanoparticles, preparing the magnetic spheres and stirring and mixing the silicon sphere solution and the magnetic spheres; the magnetic spheres adsorbing the silicon spheres are transferred into an alcohol-water system and the silicon spheres form silicon layers on the surfaces of the magnetic spheres by using a TEOS sol-gel method; and the product silicon-coated nano magnetic spheres are obtained through washing after magnetic separation. The preparation method of the silicon-coated nano magnetic spheres is simple, safe, low in raw material cost and suitable for industrial large-scale production; the prepared nano magnetic spheres are good in dispersity and high in magnetic responsiveness; and the monodisperse silicon-coated nano magnetic spheres have a wide application prospect in the fields of bioseparation, environment, catalysis, solid-phase extraction and the like.

Description

technical field [0001] The invention relates to the field of macro-preparation of magnetic nanocomposite microspheres, in particular to a method for preparing silicon-coated nanomagnetic spheres. Background technique [0002] Magnetic nanoparticles have surface effects, small size effects, quantum effects and superparamagnetism, which make them have broad application prospects, so they have attracted much attention. Typical superparamagnetic nanoparticles are mainly metal oxides, such as Fe 3 o 4 , Y-Fe 2 o 3 , MO·Fe 2 o 3 (M is Co, Cu, Mn) etc. Nano Fe 3 o 4 Due to the characteristics of simple preparation, strong magnetic response ability, and easy surface modification, it has become the most widely used magnetic material at present. [0003] Due to their small size and surface effects, magnetic nanoparticles are very easy to agglomerate and oxidize, which seriously affects their stability during use. Although the stability of magnetic nanoparticles modified by P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/00H01F41/00B82Y30/00B82Y40/00
Inventor 陈国王亮
Owner HUAQIAO UNIVERSITY
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