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Silicon dioxide nano magnetic microsphere and preparation method thereof

A technology of silica and nano-magnetism, which is applied in the fields of magnetism of inorganic materials, manufacturing of inductors/transformers/magnets, circuits, etc., can solve the problems of small specific surface area, small pore size, and uneven distribution of magnetic composite microspheres, so as to improve the binding efficiency , strong magnetism and large specific surface area

Inactive Publication Date: 2013-09-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the main technical problems of the magnetic composite microspheres in the prior art, such as small specific surface area, small pore size and uneven distribution, and the purpose is to provide a low-cost preparation technology for preparing porous silica nano-magnetic microspheres

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  • Silicon dioxide nano magnetic microsphere and preparation method thereof
  • Silicon dioxide nano magnetic microsphere and preparation method thereof
  • Silicon dioxide nano magnetic microsphere and preparation method thereof

Examples

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Embodiment 1

[0027] Fe prepared by hydrothermal synthesis 3 o 4 Nanospheres 0.5g, sonicated in 250mL 0.1M HCl for 10min, magnetically separated, washed 3 times with deionized water, then uniformly dispersed in 400mL ethanol and 100mL water mixed solvent, added concentrated ammonia 6mL to adjust the pH to 11, then added TEOS (tetraethyl orthosilicate) 6mL, stirred at room temperature for 6h, magnetically separated, washed repeatedly with ethanol and water, dispersed again in 170mL ethanol and 30mL water, added ammonia water 8mL, added dropwise the mesoporous silica precursor (volume ratio 1:4 mixture of hexadecyltrimethoxysilane and ethyl orthosilicate), add 6mL and stir for 12h. Magnetic separation, washing with deionized water and ethanol several times, and vacuum drying at 60°C. Burn the obtained powder at 550° C. to remove the alkyl group, and obtain silica nano-magnetic microspheres with mesoporous structure. The obtained silica nano-magnetic microspheres have a specific surface of ...

Embodiment 2

[0029] Fe prepared by hydrothermal synthesis 3 o 4 Ultrasonicate 0.5g of nanospheres in 250mL of 0.1M HCl for 10min, magnetically separate, wash with deionized water for 3 times, then uniformly disperse in a mixed solvent of 400mL of ethanol and 100mL of water, add 6mL of concentrated ammonia water to adjust the pH to 11, then add 6mL of TEOS , stirred at room temperature for 6 hours, magnetically separated, washed repeatedly with ethanol and water, dispersed again in 170mL of ethanol and 30mL of water, added 8mL of ammonia water, and added dropwise silica precursor hexadecyltrimethoxysilane and ethyl orthosilicate A total of 6 mL of the ester mixture (volume ratio 1:1) was stirred for 16 h. Magnetic separation, washing with deionized water and ethanol several times, and vacuum drying at 60°C. Burn the obtained powder at 550° C. to remove the alkyl group, and obtain silica nano-magnetic microspheres with mesoporous structure. The obtained silica nano-magnetic microspheres h...

Embodiment 3

[0031] Fe prepared by hydrothermal synthesis 3 o 4 Ultrasonicate 0.5g of nanospheres in 250mL of 0.1M HCl for 10min, magnetically separate, wash with deionized water for 3 times, then uniformly disperse in a mixed solvent of 400mL of ethanol and 100mL of water, add 6mL of concentrated ammonia water to adjust the pH to 11, then add 6mL of TEOS , stirred at room temperature for 6 h, magnetically separated, washed repeatedly with ethanol and water, dispersed again in 170 mL of ethanol and 30 mL of water, added 8 mL of ammonia water, added dropwise 6 mL of silica precursor hexadecyltrimethoxysilane, and stirred for 16 h. Magnetic separation, washing with deionized water and ethanol several times, and vacuum drying at 60°C. Burn the obtained powder at 550° C. to remove the alkyl group, and obtain silica nano-magnetic microspheres with mesoporous structure. The specific surface of the obtained silica nano-magnetic microspheres tested on the micrometrics ASAP2020 specific surface i...

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Abstract

The invention discloses a silicon dioxide nano magnetic microsphere. The particle size is 50-600 nm, an inner core is a magnetic nanoparticle with the particle size of 10-500 nm, compact silicon dioxide with the thickness of 1-10 nm is arranged in a middle layer, mesoporous silicon dioxide is arranged in an outer layer, the specific surface area of the nano magnetic microsphere is 10-500 m<2> / g, and the average aperture is 2-50 nm. A preparation method for the silicon dioxide nano magnetic microsphere comprises the steps as follows: dispersing the magnetic nanoparticle in a solvent, adding a compact silicon dioxide precursor, stirring for reaction, and coating the outer surface of the magnetic nanoparticle with a layer of compact silicon dioxide; adding a mesoporous silicon dioxide precursor and stirring for reaction; and separating and carrying out mesoporous formation to obtain the silicon dioxide nano magnetic microsphere with a mesoporous structure. The silicon dioxide nano magnetic microsphere has the functions of large specific surface area, adjustable aperture and capability of loading molecules with different sizes, and is widely applied to the aspects of cell separation, enzyme immobilization, protein separation, immunodetection, immunodiagnosis of water body pollutants and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanoparticles, and in particular relates to a silicon dioxide nano-magnetic microsphere and a preparation method thereof. Background technique [0002] Magnetic nanoparticles can be magnetized under the action of an external magnetic field, and have been widely studied in the biological field, such as magnetic resonance imaging, drug delivery, biosensors, bioseparation, and thermomagnetic diagnosis and treatment, etc.; separated out. The method is sensitive, simple and efficient. Therefore, magnetic mesoporous materials with both magnetism and high specific surface area are considered to be a kind of macromolecule loading materials with great application potential. It has good application prospects in sewage treatment, separation and enrichment of biomolecules, heterogeneous catalyst carrier and other fields. However, bare magnetic nanoparticles such as Fe 3 o 4 Unstable, the structure is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/11C04B35/628H01F41/02
Inventor 胡娟黄晓
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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