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Li-Zn ferrite magnetic nanometer fiber and preparation method thereof

A magnetic nano and ferrite technology, applied in fiber processing, spinning solution preparation, fiber chemical characteristics, etc., can solve the problems of low cost and achieve low cost, high yield and simple preparation method

Inactive Publication Date: 2013-02-20
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that there are only Li-Zn ferrite magnetic nanopowders and thin films in the prior art and there is no Li-Zn ferrite magnetic one-dimensional nanostructure, the invention provides Li-Zn ferrite magnetic nanofibers and their The preparation method has simple process and cheap raw materials and equipment

Method used

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  • Li-Zn ferrite magnetic nanometer fiber and preparation method thereof
  • Li-Zn ferrite magnetic nanometer fiber and preparation method thereof
  • Li-Zn ferrite magnetic nanometer fiber and preparation method thereof

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preparation example Construction

[0031] (3) Preparation of Li-Zn ferrite nanofibers: the precursor fibers obtained in step (2) are properly dried in the range of 80-100°C and then put into a program-controlled electric furnace for heat treatment, at a temperature of 2-5°C / min The heating rate is heated from room temperature to 350-600°C, preferably 400-550°C, and kept at the calcination temperature for 1-3 hours, and then naturally cooled to room temperature with the furnace body, and the Li-Zn ferrite described in the present invention can be obtained. body nanofibers.

[0032] Said polymer of the present invention is polyvinylpyrrolidone, polyvinyl alcohol, polyacrylonitrile etc., preferably polyvinylpyrrolidone, average molecular weight is 1300000.

[0033] Said solvent of the present invention is water, ethanol or dimethylformamide etc., preferably ethanol or water.

Embodiment 1

[0035] Take 1.5000g polyvinylpyrrolidone (PVP, average molecular weight Mw=1300000) and add it to a mixed solvent composed of 15.6600g absolute ethanol and 10.4400g deionized water, stir magnetically at room temperature until the polymer is completely dissolved, and then weigh 2.1440g ferric nitrate, 0.0545g lithium nitrate and 0.2015g zinc nitrate are added together in the above-mentioned PVP solution, continue magnetic stirring for about 10 hours to form a homogeneous, transparent and stable spinning solution, wherein the mass percentage of PVP is 5wt%, and the mass percentage of inorganic salt is 8wt%.

[0036] Introduce the obtained spinning solution into the electrospinning device, and then apply a voltage of 15kV, the solution feed rate is 0.5mL / h, the receiving distance is 15cm, the temperature is 20-25°C, and the humidity is 40-50%. Carry out electrospinning, the morphology of the PVP / inorganic salt composite precursor fiber that makes is shown in figure 2 As shown, ...

Embodiment 2

[0039] The basic preparation process is the same as that of Example 1, except that the chemical composition of the inorganic salt is the ratio of the amount of metal elements: the masses of iron nitrate, lithium nitrate and zinc nitrate are 2.2022, 0.0626 and 0.1351 g, respectively. Li produced 0.4 Zn 0.2 Fe 2.4 o 4 The diameter of the nanofiber is 50-100nm, with a single-phase cubic spinel structure, and the specific saturation magnetization and coercive force at room temperature are 67.8A m 2 kg -1 and 14.5kA·m -1 .

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Abstract

The invention relates to a Li-Zn ferrite magnetic nanometer fiber and a preparation method thereof. The spinel type Li-Zn ferrite magnetic nanometer fiber is prepared by adopting a high-voltage electrostatic spinning technology which comprises the following technical steps of: 1, preparing spinning solution; 2, carrying out electrostatic spinning to prepare the precursor fiber; and 3, carrying out high-temperature calcinations to obtain the pure phase crystal Li-Zn ferrite continuous nanometer fiber. The appearance of the target nanometer fiber can be perfectly controlled through regulating the chemical composition of the solution and the electric spinning process parameters. The method and the equipment provided by the invention are simple, the cost is low, a large amount of Li-Zn ferrite magnetic nanometer fiber can be continuously prepared, the diameter of the obtained fiber is 50 to 100nm, good magnetism can be obtained at the room temperature, and the wide application aspects arerealized in the fields such as micro nanometer electronic devices, magnetic sensors, flexible magnetic bodies, microwave absorption, electromagnetic shielding and the like.

Description

technical field [0001] The invention belongs to the field of magnetic nanometer materials, and in particular relates to a ferrite nanofiber and its preparation technology. Background technique [0002] One-dimensional magnetic nanomaterials such as nanotubes, nanobelts, nanowires and nanofibers not only have various special effects of ordinary nanoparticles such as small size effect, surface effect, quantum size effect, macroscopic quantum tunneling effect, Coulomb blocking and quantum tunneling. It also has unique shape anisotropy and magnetic anisotropy, which are different from the corresponding bulk materials, nanoparticles and thin films in terms of optical, electrical and magnetic properties. properties, which makes them arouse great interest and high attention in basic research and high-tech applications, and is considered to be an important component in the construction of new functional electromagnetic functional materials and devices. Micro-nano electronic devices...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/10D01D5/00D01D1/02
Inventor 向军褚艳秋周广振郭银涛沈湘黔
Owner JIANGSU UNIV OF SCI & TECH
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