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Preparation method of a size-tunable monodisperse nanoporous fe@c core-shell structure

A nanoporous, core-shell structure technology, applied in the field of materials, achieves good application prospects, simple process and low cost

Active Publication Date: 2021-02-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature search shows: there is not yet domestic and foreign literature reports about using water-ethanol as solvent, PVP as surfactant and carbon source, sodium borohydride (NaBH 4 ) as a reducing agent in liquid phase reduction at room temperature to prepare Fe@C nanoparticles

Method used

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  • Preparation method of a size-tunable monodisperse nanoporous fe@c core-shell structure
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  • Preparation method of a size-tunable monodisperse nanoporous fe@c core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Add 1g of PVP powder to a mixed solution of 30mL water and ethanol (V 水 / V 乙醇 =30mL / 0mL), stir evenly to obtain a clear liquid;

[0033] 2) Add 95 mg of ferrous chloride powder into the clarified liquid, stir and dissolve in an ice-water bath for 15 minutes to obtain a light green solution; then pass Ar gas into the solution to exhaust for 15 minutes to prevent Fe 2+ Be oxidized so that the entire reaction system is in an Ar atmosphere;

[0034] 3) 45ml of NaBH4 solution with a concentration of 100mM was added dropwise to the above solution to obtain a black precipitate, which was separated, washed repeatedly, centrifuged, and freeze-dried to obtain a monodisperse Fe sphere powder;

[0035] Embodiment 1 obtains powder appearance such as figure 1 As shown, it can be seen that the morphology of the powder is a monodisperse sphere, and the average particle size is about 724nm.

Embodiment 2

[0037] 1) Add 1g of PVP powder to a mixed solution of 30mL water and ethanol (V 水 / V 乙醇 =22.5mL / 7.5mL), stir evenly to obtain a clear liquid;

[0038] 2) Add 95 mg of ferrous chloride powder into the clarified liquid, stir and dissolve in an ice-water bath for 15 minutes to obtain a light green solution; then pass Ar gas into the solution to exhaust for 15 minutes to prevent Fe 2+ Be oxidized so that the entire reaction system is in an Ar atmosphere;

[0039] 3) adding 45ml of NaBH4 solution with a concentration of 100mM dropwise into the above solution to obtain a black precipitate, which was separated, washed repeatedly, centrifuged, and freeze-dried to obtain a monodisperse Fe powder;

[0040] The appearance of the monodisperse Fe powder that embodiment 2 obtains is as figure 2 As shown, it can be seen that the morphology of the powder is monodisperse spherical, and the average particle size is about 656nm.

Embodiment 3

[0042] 1) Add 1g of PVP powder to a mixed solution of 30mL water and ethanol (V 水 / V 乙醇 =15mL / 15mL), stir evenly to obtain a clear liquid;

[0043] 2) Add 95 mg of ferrous chloride powder into the clarified liquid, stir and dissolve in an ice-water bath for 15 minutes to obtain a light green solution; then pass Ar gas into the solution to exhaust for 15 minutes to prevent Fe 2+ Be oxidized so that the entire reaction system is in an Ar atmosphere;

[0044] 3) adding 45ml of NaBH4 solution with a concentration of 100mM dropwise into the above solution to obtain a black precipitate, which was separated, washed repeatedly, centrifuged, and freeze-dried to obtain a monodisperse Fe powder;

[0045] The morphology of the powder that embodiment 3 obtains is as image 3 As shown, it can be seen that the morphology of the powder is monodisperse spherical, and the average particle size is about 466nm.

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Abstract

The invention discloses a preparation method of a size-adjustable monodisperse nanoporous Fe@C core-shell structure. Polyvinylpyrrolidone (PVP) powder is added to a mixed solution of water and ethanol and stirred evenly to obtain a clear liquid; Add ferrous salt solution to the clarified solution, feed argon and stir in an ice-water bath for 30 min to obtain a light green solution; add sodium borohydride (NaBH 4 ) solution, the obtained black product was centrifuged and washed and dried, and the Fe@C core-shell structure powder could be obtained by heat treatment at different temperatures and holding times. The method is simple in process and low in cost. By adjusting the components in the mixed solution of water and ethanol, the reaction time, and the temperature and time of heat treatment, a size-adjustable monodisperse powder with nanoporous Fe@C core-shell structure is obtained. It has excellent electromagnetic wave absorption performance, is suitable for large-scale industrial production, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a preparation method of nanomaterials, in particular to a preparation method of monodisperse nanoporous Fe@C core-shell structure powder with adjustable size. Background technique [0002] Ferromagnetic metal micro-nanomaterials have the advantages of high saturation magnetization, high Snoek's cut-off frequency and high Curie temperature, and can realize strong absorption of electromagnetic waves in a wide frequency range. Ideal for coatings. However, ferromagnetic metal micro-nanoparticles are easy to oxidize in air and corrode in acidic environment, and due to high surface activity, ferromagnetic metal micro-nanoparticles are prone to agglomeration. The electromagnetic wave absorption properties of magnetic nanometals have become a research hotspot. The methods reported in the literature mainly include surface insulation treatment, doping with dielectric elements, and coating with a d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B22F1/02B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F2009/245B22F1/054B22F1/16B22F1/145
Inventor 孔春才杨志懋郭健杨森
Owner XI AN JIAOTONG UNIV
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