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One-dimensional magnetic Fe-Co alloy/cobalt ferrite composite nano-fibers and preparation method thereof

A technology of composite nanofibers and cobalt ferrite, which is applied in the fields of fiber chemical characteristics, textiles and papermaking, artificial filaments made of inorganic raw materials, etc., can solve the problems of complex process, unfavorable industrial production, long process, etc., and achieve simple preparation method, Improvement of high-frequency electromagnetic characteristics and enhancement of saturation magnetization

Inactive Publication Date: 2013-04-17
JIANGSU UNIV OF SCI & TECH
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Problems solved by technology

[0004] So far, many methods such as template-assisted growth, solvothermal synthesis, and high-temperature catalytic growth based on gas-liquid-solid mechanism have been developed for the design and synthesis of one-dimensional magnetic nanostructure materials, but these preparation techniques have more or less disadvantages. Either the process is complicated and the process is long, or templates or catalysts are needed, which is not conducive to the transformation into industrial production

Method used

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  • One-dimensional magnetic Fe-Co alloy/cobalt ferrite composite nano-fibers and preparation method thereof
  • One-dimensional magnetic Fe-Co alloy/cobalt ferrite composite nano-fibers and preparation method thereof
  • One-dimensional magnetic Fe-Co alloy/cobalt ferrite composite nano-fibers and preparation method thereof

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preparation example Construction

[0024] The method for preparing Fe-Co alloy / cobalt ferrite composite nanofibers provided by the invention mainly includes preparation of electrospinning solution, electrospinning process, preparation and reduction treatment of cobalt ferrite nanofibers. The steps are:

[0025] (1) The preparation of the electrospinning solution is mainly to prepare a solution with suitable viscosity and spinnability. The specific process is: add a certain amount of polymer into the corresponding solvent, stir magnetically at room temperature for 1 to 2 hours, then add an appropriate amount of metal inorganic salt according to the ratio of the amount of substances Co:Fe=1:2, and continue magnetically stirring for 3 hours. ~15h, until a uniform, transparent and stable spinning solution is formed. The metal inorganic salt is nitrate or acetate. The mass ratio of each component in the spinning solution is: polymer 4-15wt%, preferably 6-10wt%, inorganic salt 5-20wt%, preferably 8-15wt%, and the r...

Embodiment 1

[0032]Add a certain amount of polyvinylpyrrolidone (PVP) with an average molecular weight of 1,300,000 to a mixed solvent composed of deionized water and absolute ethanol (water / alcohol ratio is 2 / 3), and stir magnetically at room temperature for about 1.5h until PVP Add appropriate amount of iron nitrate (Fe(NO 3 ) 3 9H 2 O) and cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O), the quality of the two inorganic salts is determined by Co 2+ with Fe 3+ The ratio of the amount of substances is equal to the ratio of 1:2. Continue magnetic stirring for about 10 hours to prepare a uniform and transparent spinning solution, wherein the content of PVP is 6wt%, and the content of inorganic salt is 13wt%. The prepared solution was introduced into an electrospinning device for spinning. The spinning conditions were: voltage 15kV, the distance between the collector and the spinneret, that is, the solidification distance, 15cm, the solution propulsion rate 0.5mL / h, and the spinneret diameter 0....

Embodiment 2

[0034] Basic process is the same as embodiment 1. The difference is that the calcination temperature of cobalt ferrite nanofibers is 400°C, the content of the alloy phase in the prepared Fe-Co alloy / cobalt ferrite composite nanofibers is about 90wt%, and its saturation magnetization and coercion at room temperature The coercive force is about 190emu / g and 81kA / m respectively.

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Abstract

The invention discloses one-dimensional magnetic Fe-Co alloy / cobalt ferrite composite nano-fibers and a preparation method thereof. The diameter of the nano-fibers is 50 to 100 nanometers; a Fe-Co alloy phase has a body-centered cubic structure; the nano-fibers have good magnetism at room temperature; and the phase composition of the composite nano-fibers can be effectively adjusted and controlled by changing the roasting temperature of the cobalt ferrite nano-fibers and the reduction temperature and time of the cobalt ferrite nano-fibers in a hydrogen atmosphere, and the alloy phase content of the nano-fibers changes between about 10 weight percent and nearly 100 weight percent. The preparation method comprises the following steps of: firstly, preparing composite precursor nano-fibers of polyvinylpyrrolidone and related metal inorganic salts by electrostatic spinning; then, preparing pure-phase crystalline cobalt ferrite nano-fibers through high-temperature roasting; and finally, performing reduction treatment on the obtained cobalt ferrite nano-fibers in the hydrogen atmosphere to obtain the Fe-Co alloy / cobalt ferrite composite nano-fibers consisting of different phases.

Description

technical field [0001] The invention relates to the field of low-dimensional magnetic nanocomposite materials, in particular to a Fe-Co alloy / cobalt ferrite composite nanofiber and a preparation method thereof. Background technique [0002] Magnetic transition metals or alloys have high saturation magnetization and initial permeability, but the disadvantage is that they are unstable and easily oxidized in the air. At the same time, due to the low resistivity, eddy current loss will occur in the high frequency range, resulting in high frequency The electromagnetic performance is significantly reduced; ferrite has high resistivity, mechanical strength and chemical stability, and has good high-frequency electromagnetic performance, but the disadvantage is that the saturation magnetization is relatively low. The composite nanostructure of magnetic transition metals or alloys and ferrite can not only maintain the functions and characteristics of each component, but also may produ...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01F11/00
Inventor 向军周广振郭银涛褚艳秋张雄辉
Owner JIANGSU UNIV OF SCI & TECH
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