Hollow magnetic meso pore SiO2 nano-material and preparation method

A nanomaterial and hollow technology, which is applied in the field of hollow magnetic mesoporous SiO2 nanomaterials and its preparation, can solve the problems of easy agglomeration of nanomagnetic particles, application limitations, and not yet seen, and achieves simple preparation, low cost, and magnetic properties. controllable effect

Inactive Publication Date: 2013-06-05
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanomagnetic particles are usually very easy to agglomerate, which limits their applications
However, no SiO 2 Coated Cobalt Ferrite Hollow Composite Magnetic Particles Report

Method used

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  • Hollow magnetic meso pore SiO2 nano-material and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0031] 1) The 0.05 g / mL glucose solution was hydrothermally synthesized at a hydrothermal temperature of 200 °C for 4 h to prepare carbon spheres;

[0032] 2) Prepare a 0.003 g / mL NaCl solution, add polymethyldiallylammonium chloride, namely PDDA, to prepare a 0.1 wt.% PDDA solution, add the product obtained in the above step 1) and stir for 60 min before filtering, Obtain carbon sphere-PDDA; prepare 0.003 g / mL NaCl solution, add polystyrene sulfonate sodium, namely PSS, to prepare 0.05 wt.% PSS solution, add carbon sphere-PDDA and stir for 30 min, then filter to obtain carbon Balls-(PDDA-PSS); add carbon balls-(PDDA-PSS) to the above PDDA solution to prepare carbon balls-(PDDA-PSS-PDDA) particles, and finally make the surface of carbon balls uniformly distributed positive charges;

[0033] 3) Add 0.045 g / mL FeCl 3 ·6H 2 O and 0.02 g / mL CoCl 2 ·6H2 O dissolved in ethylene glycol, where FeCl 3 ·6H 2 O and CoCl 2 ·6H 2 The molar ratio of O is 2:1; then urea and polyvinylp...

Embodiment 3

[0038] 1) The 0.5 g / mL glucose solution was hydrothermally synthesized at a hydrothermal temperature of 150 °C for 12 h to prepare carbon spheres;

[0039] 2) Prepare a 0.005 g / mL NaCl solution, add polymethyldiallyl ammonium chloride, namely PDDA, to prepare a 0.2 wt.% PDDA solution, add the product obtained in the above step 1) and stir for 60 min before filtering, Obtain carbon spheres-PDDA; prepare 0.005 g / mL NaCl solution, add polystyrene sulfonate sodium, namely PSS, to prepare a 0.1 wt.% PSS solution, add carbon spheres-PDDA and stir for 30 min, then filter to obtain carbon Ball-(PDDA-PSS); continue to enter the carbon ball-(PDDA-PSS) into the above PDDA solution to prepare carbon ball-(PDDA-PSS-PDDA) particles, and finally make the carbon ball surface evenly distributed positive charges;

[0040] 3) Add 0.405 g / mL FeCl 3 ·6H 2 O and 0.18 g / mL CoCl 2 ·6H 2 O dissolved in ethylene glycol, where FeCl 3 ·6H 2 O and CoCl 2 ·6H 2 The molar ratio of O is 2:1; then ure...

Embodiment 4

[0045] 1) The 0.45 g / mL glucose solution was hydrothermally synthesized at a hydrothermal temperature of 180 °C for 6 h to prepare carbon spheres;

[0046] 2) Prepare a 0.004 g / mL NaCl solution, add polymethyldiallyl ammonium chloride, namely PDDA, to prepare a 0.2 wt.% PDDA solution, add the product obtained in the above step 1) and stir for 60 min before filtering, Obtain carbon spheres-PDDA; prepare 0.004 g / mL NaCl solution, add sodium polystyrene sulfonate, namely PSS, to prepare a 0.1 wt.% PSS solution, add carbon spheres-PDDA and stir for 30 min, then filter to obtain carbon Balls-(PDDA-PSS); adding carbon balls-(PDDA-PSS) to the above PDDA solution to prepare carbon balls-(PDDA-PSS-PDDA) particles, finally making the surface of carbon balls uniformly distributed positive charges;

[0047] 3) Add 0.09 g / mL FeCl 3 ·6H 2 O and 0.04 g / mL CoCl 2 ·6H 2 O dissolved in ethylene glycol, where FeCl 3 ·6H 2 O and CoCl 2 ·6H 2 The molar ratio of O is 2:1; Then urea and poly...

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Abstract

The invention discloses a hollow magnetic meso pore SiO2 nano-material and a preparation method, the material is in a hollow structure, a composition substance is magnetic particles and SiO2, the magnetic particles are coated by SiO2. The method comprises the following steps: using a hydro-thermal synthesis method to prepare cobalt ferrite nano particles, using glucose for hydro-thermal synthesis to obtain the nano carbon spheres; depositing SiO2 on the preparative magnetic particle surface through a silicon source reaction to prepare the magnetic meso pore SiO2 nano particles; taking carbon spheres as a template material, using an absorption for loading the magnetic meso pore SiO2 nano particles on the surface of the carbon spheres surface to prepare a SiO2-CoFe2O4-carbon spheres compound; and calcining the SiO2-CoFe2O4-carbon spheres compound to prepare the hollow magnetic meso pore SiO2 nano-material. The meso pore SiO2 nano-material has the advantages of adjustable aperture, controllable magnetic performance, uniform dimension and no physiology toxicity. The hollow structure enables the composite microspheres to have low density and high specific surface area.

Description

technical field [0001] The invention relates to a novel magnetic material, specifically a hollow magnetic mesoporous SiO 2 Nanomaterials and their preparation methods. Background technique [0002] Nano-ferrite magnetic materials have unique structure and magnetic properties. Because of their advantages such as low high-frequency loss, high density, wear resistance and long life, they are widely used in aviation, electronics, information, metallurgy, chemical industry, biology and medicine. Wide range of applications. Nanomagnetic particles are usually very easy to agglomerate, which limits their applications. Modification of magnetic particles or combination with other substances can effectively reduce agglomeration and facilitate the dispersion and stability of particles. Currently, using SiO 2 Coating magnetic particles to prepare magnetic mesoporous SiO 2 microspheres; with SiO 2 cladding layer to improve the stability of the composite and utilize SiO 2 The high s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02H01F1/01
Inventor 李琴王冰李闯崔皓张进翟建平
Owner NANJING UNIV
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