Composite nanometer material with core-shell structure, preparation method and application of composite nanometer material

A technology of composite nanomaterials and core-shell structure, which is applied in the field of magnetic composite materials and its preparation, can solve the problems of difficulty in adjusting the thickness of the carbon shell layer, the contact of the magnetic core with the environmental medium, and the damage of the magnetic core, so as to achieve regular shape and structure. Adjustable, good stability

Inactive Publication Date: 2015-03-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dispersion of the product obtained by this method is improved, but the thickness of the carbon shell is still difficult to adjust (J. Phys. Chem. C, 2011, 115, 11427; Nanoscale, 2012, 4, 5210)
In addition, although the stability of the above-mentioned core-shell materials has b

Method used

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  • Composite nanometer material with core-shell structure, preparation method and application of composite nanometer material
  • Composite nanometer material with core-shell structure, preparation method and application of composite nanometer material
  • Composite nanometer material with core-shell structure, preparation method and application of composite nanometer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 0.33g ferric oxide nanoparticles and disperse them in 90ml ethanol, add 30ml deionized water, 2g ammonia water, after stirring evenly, add 0.6g orthosilicate ethyl ester, 0.3g resorcinol, 0.45g mass concentration is 37 % formaldehyde solution, stirred mechanically at 30°C for 24h, transferred the reactant to a stainless steel autoclave lined with polytetrafluoroethylene, stood at 100°C for 24h, and magnetically separated the solid product after cooling, and deionized water and Wash each with ethanol three times, and dry at room temperature to prepare a core-shell structure magnetic iron oxide-silica-phenolic resin polymer composite material.

Embodiment 2

[0018] Take 0.08g of ferric oxide nanoparticles and disperse them in 45ml of ethanol, add 15ml of deionized water, 1g of ammonia water, stir well, then add 0.2g of tetraethyl orthosilicate, 0.2g of resorcinol, and the mass concentration of 0.30g is 37 % formaldehyde solution, stirred mechanically at 30°C for 24h, transferred the reactant to a stainless steel autoclave lined with polytetrafluoroethylene, stood at 100°C for 24h, and magnetically separated the solid product after cooling, and deionized water and Wash each with ethanol three times, and dry at room temperature to prepare a core-shell structure magnetic iron oxide-silica-phenolic resin polymer composite material.

Embodiment 3

[0020] Take 0.14g of ferric oxide nanoparticles and disperse them in 45ml of ethanol, add 15ml of deionized water, 1g of ammonia water, stir evenly, add 0.2g of tetraethyl orthosilicate, 0.1g of resorcinol, and the mass concentration of 0.15g is 37 % formaldehyde solution, stirred mechanically at 30°C for 24h, transferred the reactant to a stainless steel autoclave lined with polytetrafluoroethylene, stood at 100°C for 24h, and magnetically separated the solid product after cooling, and deionized water and Wash each with ethanol three times, and dry at room temperature to prepare a core-shell structure magnetic iron oxide-silica-phenolic resin polymer composite material.

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Abstract

The invention provides a magnetic iron oxide-silicon dioxide-phenolic resin polymer composite nanometer material with a core-shell structure, a preparation method and application of the composite nanometer material. The material has a regular spherical morphology; an inner core is magnetic iron oxide nano particles; an inner shell layer is silicon dioxide; an outer shell layer is a phenolic resin polymer; the thicknesses of the inner shell layer and the outer shell layer can be modulated; the outer shell layer can be transformed into carbon after high-temperature treatment in nitrogen; and the overall morphology and the structure of the material are kept invariable. The material is prepared by the following steps: introducing magnetic iron oxide nano particles into a mixed solution of ethyl alcohol/deionized water/ammonium hydroxide; and adding a silicon source and a carbon source to carry out hydrolysis and polymerization reaction. The magnetic iron oxide-silicon dioxide-phenolic resin polymer composite nanometer material has the effects and advantages that the provided core-shell material is good in stability and simple in preparation process, and can be used for adsorbing and separating a nano noble-metal catalyst carrier.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to a magnetic composite material, a preparation method and application thereof. Background technique [0002] Due to its huge specific surface area and good chemical stability, carbon materials have broad application space in the fields of catalysis, adsorption separation, and electrochemistry. However, the difficulty of separation has always been the primary factor restricting the large-scale application of carbon materials. Introducing magnetic materials into carbon materials to form a composite system, while retaining the properties of carbon materials, can be separated by means of an external magnetic field, so it has attracted extensive attention from researchers. [0003] At present, magnetic carbon composite materials mainly include porous carbon materials doped with magnetic nanoparticles and core-shell materials with carbon-coated magnetic particles. In the former materi...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J32/00B01J31/28
CPCB01J20/06B01J20/103B01J20/262B01J20/28019B01J31/28B01J2220/46
Inventor 金长子王彦杰王军虎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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