A core-shell heterostructure magnetic fiber and its preparation and application method

A technology of heterostructure and magnetic fibers, which is applied in the field of nanomaterials, can solve the problems of inability to obtain nanofibers, limited wide use, and thick fibers, and achieves good microwave absorption characteristics, adjustable size and composition, dispersibility and uniformity. good effect

Active Publication Date: 2020-08-25
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on Cu / Fe / C core-shell heterostructure nanofibers
The above-mentioned patent documents disclose that copper fibers are mainly prepared by metal mechanical cutting, in which the electrospinning-carbonization method requires high temperature, special equipment, low output, high energy consumption, and high cost, which limit its wide use; metal The fibers prepared by mechanical cutting method are relatively thick, and uniform nano-scale fibers cannot be obtained

Method used

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  • A core-shell heterostructure magnetic fiber and its preparation and application method
  • A core-shell heterostructure magnetic fiber and its preparation and application method
  • A core-shell heterostructure magnetic fiber and its preparation and application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Prepare 20 milliliters of 50 millimoles per liter of copper acetate solution (0.2 g) and 60 milliliters of 16.7 millimoles per liter of pyrrole aqueous solution (the ratio of pyrrole to the amount of copper acetate substance is 2:1), and then the prepared pyrrole The aqueous solution and the copper acetate solution were successively transferred to the lining of a 100 ml reaction kettle, and the mixed solution was obtained after magnetic stirring for 60 minutes, and then the lining was put into the reaction kettle and sealed, and reacted in an oven at 140°C for 10 hours; at room temperature Disperse the lower precipitate in ethanol, precipitate and separate, and repeat this several times to obtain a pure precipitate, which is finally dried to obtain polypyrrole / Cu 2 O core-shell heterogeneous fibers.

[0033] The resulting product is green, and its phase, structure, morphology, microstructure and selected area electron diffraction spectrum observed under an XRD diffractom...

Embodiment 2

[0035] The steps are the same as in Example 1, but the ratio of the amount of pyrrole to copper acetate is 0.5:1, and the concentration of pyrrole is 8.3 mmol per liter. The morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 6 shown. It can be seen that the product is polypyrrole / Cu with smooth surface and uniform thickness. 2 O core-shell heterogeneous fibers, the diameter of which is 100-200nm. The reaction ratio decreases and the diameter becomes larger.

Embodiment 3

[0037] The steps are the same as in Example 1, but the ratio of pyrrole to copper acetate is 2:0.5, and the copper salt concentration is 25 millimoles per liter. The morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 7 shown. It can be seen that the product is a homogeneous polypyrrole / Cu 2 O core-shell heterogeneous fibers with a diameter of 110-200nm.

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Abstract

The invention discloses a magnetic fiber with a core-shell heterogeneous structure and a preparation and application method thereof. The composition of the fiber is Fe, Cu, and C; the atomic percentages of Fe, Cu, and C elements are 12.2-29.6%, 9.2-55.2%, and 32.5-70.5% respectively; its structure is composed of Cu / Fe core and C shell Nanofibers with hollow or porous Cu / Fe / C core-shell structure, the fiber length is 50μm, the diameter is 70-380nm; its saturation magnetization is 80.4-152.89emu·g –1 . The fiber was fabricated by in-situ carbothermal reduction-chemical vapor deposition method, that is, the ceramic arks were loaded with organic polymer-coated Cu 2 O core-shell heterogeneous nanofibers and iron pentacarbonyl are placed in a tube furnace and roasted under the protection of an inert gas. The invention has the advantages of simple equipment, short cycle time, good repeatability, and large-scale production, and has broad application prospects in the fields of electrocatalysis, microwave absorption, lithium ion batteries, surface-enhanced Raman spectroscopy, and the like.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a simple method for preparing Cu / Fe / C core-shell heterostructure magnetic fibers. Background technique [0002] Cu and its alloy fiber nanometers have been applied to glass, ceramic colorants, paint anti-wrinkle, automobile exhaust purification, VLSI, electrocatalysis, lithium-ion batteries due to their high specific surface area, good electrical conductivity, and high catalytic activity. , surface enhanced Raman spectroscopy, microwave absorption and shielding and other fields. At present, Cu and its alloy fibers have been synthesized by metal mechanical cutting method, electrospinning-carbonization method, etc. For example, patent document (CN 101104896A) discloses a fiber composite reinforced Cu-Fe-RE alloy and a preparation method thereof; patent document (CN 107988789A) discloses a composite conductive fiber composed of multiple metals; (CN 10436860B) discloses a kin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F1/02B22F9/20B22F9/22B82Y30/00
CPCB82Y30/00B22F9/20B22F9/22B22F1/0547B22F1/17
Inventor 童国秀何娜童佳悦杨晓晨邵雯施灵秀董雯静吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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