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Magnetic carrier of surface modification and preparing method thereof

A magnetic carrier and surface modification technology, applied in the field of magnetic nanomaterials, can solve the problems of difficult filtration and washing of precipitation, and achieve the effects of strong magnetism, biocompatibility, easy functionalization, and good chemical inertness

Inactive Publication Date: 2008-09-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above methods, the co-precipitation method is used to prepare the magnetic carrier. However, the co-precipitation method is easy to introduce impurities, and the formed precipitate is in a colloidal state, which is difficult to filter and wash.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Magnetic core CoFe 2 o 4 Preparation of:

[0029] Put the feed molar ratio as [Co(NO3 ) 2 ·6H 2 O]:[FeSO 4 ·7H 2 O]: [Fe 2 (SO 4 ) 3 ·xH 2 O] = 1.92:1:1 mixture into a 500mL beaker, add CO 2 deionized water to prepare a solution with a total concentration of 0.49mol / L, transfer it into a 500mL four-necked flask, and place it in a water bath. in N 2 Under protection and stirring, 1.5 mol / L NaOH was added dropwise to the solution pH = 7, and crystallized at 40° C. for 4 hours. The resulting slurry was suction filtered, and CO 2 Washed with deionized water to pH = 7, washed twice with ethanol, and dried under vacuum at room temperature to obtain the layered precursor CoFe(II)Fe(III)-SO 4 Hydrotalcite; then put the hydrotalcite into the muffle furnace, raise the temperature to 900 °C at 5 °C / min, keep it for 1 hour, and then naturally cool to room temperature to obtain the magnetic core CoFe 2 o 4 .

[0030] (2) Preparation of SiO 2 / CoFe 2 o 4 partic...

Embodiment 2

[0034] (1) Magnetic core CoFe 2 o 4 Preparation of:

[0035] Put the feed molar ratio as [Co(NO 3 ) 2 ·6H 2 O]:[FeSO 4 ·7H 2 O]: [Fe 2 (SO 4 ) 3 ·xH 2 O] = 1.92:1:1 mixture into a 500mL beaker, add CO 2 deionized water to prepare a solution with a total concentration of 0.49mol / L, transfer it into a 500mL four-necked flask, and place it in a water bath. in N 2 Under protection and stirring, 1.5 mol / L NaOH was added dropwise to the solution pH = 7, and crystallized at 40° C. for 8 hours. The resulting slurry was suction filtered, and CO 2 Washed with deionized water to pH = 7, washed twice with ethanol, and dried under vacuum at room temperature to obtain the layered precursor CoFe(II)Fe(III)-SO 4 Hydrotalcite; then put the hydrotalcite into the muffle furnace, raise the temperature to 900 °C at 10 °C / min, keep it for 2 hours, and then naturally cool to room temperature to obtain the magnetic core CoFe 2 o 4 .

[0036] (2) Preparation of SiO 2 / CoFe 2 o 4 pa...

Embodiment 3

[0040] (1) Magnetic core CoFe 2 o 4 Preparation of:

[0041] Put the feed molar ratio as [Co(NO 3 ) 2 ·6H 2 O]:[FeSO 4 ·7H 2 O]: [Fe 2 (SO 4 ) 3 ·xH 2 O] = 1.92:1:1 mixture into a 500mL beaker, add CO 2 deionized water to prepare a solution with a total concentration of 0.49mol / L, transfer it into a 500mL four-necked flask, and place it in a water bath. in N 2 Under protection and stirring, 1.5 mol / L NaOH was added dropwise to the solution pH=7.2, and crystallized at 40° C. for 8 hours. The resulting slurry was suction filtered, and CO 2 Washed with deionized water to pH = 7, washed twice with ethanol, and dried under vacuum at room temperature to obtain the layered precursor CoFe(II)Fe(III)-SO 4 Hydrotalcite; then put the hydrotalcite into the muffle furnace, raise the temperature to 900 °C at 10 °C / min, keep it for 2 hours, and then naturally cool to room temperature to obtain the magnetic core CoFe 2 o 4 .

[0042] (2) Preparation of SiO 2 / CoFe 2 o 4 pa...

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Abstract

The invention relates to a surface modified magnetic carrier and the preparation method, belonging to the magnetic nanometer material technology filed. The surface modified magnetic carrier has a core / shell structure, including a magnetic spinel MFe2O4 core and a silicon dioxide shell with chemical inertness and biocompatibility, which can be presented as SiO2 / MFe2O4; the magnetic core is carried on silicon dioxide surface modified by a sol-gel method, the magnetic core used is a spinel ferrite prepared by a layered precursor method and the silicon dioxide precursor is a tetraethyl orthosilicate. After surface modified, the magnetic carrier has the core / shell structure, including a magnetic spinel carrier and an inert silicon dioxide surface modified layer. The invention is characterized in that the surface modified magnetic carrier not only has strong magnetism, but also has good chemical inertness and biocompatibility, the functionalization can be easily realized, the preparation method is simple, the thickness of the modified layer can be adjusted, different needs of practical application can be satisfied, and the invention is wildly applied in chemical engineering, biochemistry and medical treatment, etc.

Description

technical field [0001] The invention belongs to the technical field of magnetic nanometer materials, and in particular provides a surface-modified magnetic carrier and a preparation method thereof. technical background [0002] Magnetic particles are widely used. In the field of biomedical technology, they can be used in magnetic targeting preparations, immobilized enzymes, magnetic fluid hyperthermia, biological separation and analysis and detection; in the field of catalysis, using them as catalyst carriers is not only beneficial The separation and recovery of the catalyst can improve the catalytic activity of the catalyst; in the mechanical field, the magnetic fluid prepared from it as a raw material can be used in magnetic sealing and other aspects. In addition, the magnetic particles can also be used for nuclear magnetic resonance imaging in the field of magnetic development and as high-density magnetic recording materials in the field of magnetic recording. [0003] N...

Claims

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Application Information

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IPC IPC(8): H01F1/10B22F1/02C04B35/26C04B35/624
Inventor 张慧侯荣宫超
Owner BEIJING UNIV OF CHEM TECH
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