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Preparation method of hollow magnetic iron oxide nanofiber

A technology of magnetic iron oxide and nanofibers, which is applied in the direction of heating/cooling fabrics, textiles and papermaking, artificial filaments made of inorganic materials, etc. Solve the problems of silk liquid viscosity and other problems, and achieve the effect of excellent shape, low cost and large specific surface area

Inactive Publication Date: 2017-02-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnetic nanoparticles are very prone to agglomeration, which will reduce the viscosity of the spinning solution, resulting in discontinuity in the spinning process and increased inhomogeneity in the diameter of nanofibers.

Method used

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  • Preparation method of hollow magnetic iron oxide nanofiber
  • Preparation method of hollow magnetic iron oxide nanofiber
  • Preparation method of hollow magnetic iron oxide nanofiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: A method for preparing hollow magnetic iron oxide nanofibers, including the following steps:

[0022] (1) Add PVA (polymerization degree 2000, alcoholysis degree 96%) powder to distilled water added with glacial acetic acid to obtain mixed solution A; the concentration of PVA in mixed solution A is 12wt%, and the concentration of acetic acid is 5wt%. The mixed solution A is heated and stirred on a thermostatic magnetic stirrer to fully dissolve it. The heating temperature is adjusted to 80°C and the stirring rate is 10r / min;

[0023] (2) Pour the transparent solution obtained in step (1) into the needle tube, start electrospinning, adjust the spinning voltage to 12kv, and the distance between the syringe pump and the collection plate is 10cm to obtain a white PVA nanofiber membrane. The PVA nanofiber membrane is put into an oven for heat treatment, the temperature is adjusted to 150°C, and the heat treatment time is 30min, to obtain a yellow PVA nanofiber membrane...

Embodiment 2

[0026] Embodiment 2: A method for preparing hollow magnetic iron oxide nanofibers, including the following steps:

[0027] (1) Add PVA (polymerization degree 3200, alcoholysis degree 98%) powder to distilled water added with glacial acetic acid to obtain mixed solution A; the concentration of PVA in mixed solution A is 6wt%, and the concentration of acetic acid is 4wt%. The mixed solution A is heated and stirred on a thermostatic magnetic stirrer to fully dissolve it. The heating temperature is adjusted to 90°C and the stirring rate is 90r / min;

[0028] (2) Pour the transparent solution obtained in step (1) into the needle tube, start electrospinning, adjust the spinning voltage to 15kv, and the distance between the syringe pump and the collection plate to be 12cm to obtain a white PVA nanofiber membrane. The PVA nanofiber membrane is put into an oven for heat treatment, the temperature is adjusted to 180°C, and the heat treatment time is 10min, to obtain a yellow PVA nanofiber mem...

Embodiment 3

[0031] Embodiment 3: A method for preparing hollow magnetic iron oxide nanofibers, including the following steps:

[0032] (1) Add PVA (polymerization degree 8000, alcoholysis degree 99%) powder to distilled water added with glacial acetic acid to obtain mixed solution A; the concentration of PVA in mixed solution A is 3wt%, and the concentration of acetic acid is 50wt%. The mixed solution A is heated and stirred on a constant-temperature magnetic stirrer to make it fully dissolved. The heating temperature is adjusted to 95°C and the stirring rate is 100r / min;

[0033] (2) Pour the transparent solution obtained in step (1) into the needle tube, start electrospinning, adjust the spinning voltage to 10kv, and the distance between the syringe pump and the collection plate is 10cm to obtain a white PVA nanofiber membrane. The PVA nanofiber membrane is put into an oven for heat treatment, the temperature is adjusted to 150°C, and the heat treatment time is 30min, to obtain a yellow PVA ...

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Abstract

The invention relates to a preparation method of hollow magnetic iron oxide nanofiber. The preparation method comprises the following steps: heating and dissolving polyvinyl alcohol (PVA) in an aqueous solution of acetic acid, wherein the concentration of PVA is 1-20wt%, and the concentration of acetic acid is 1-50wt%; performing electrostatic spinning to obtain a PVA nanofiber membrane, wherein the spinning voltage is 10-20kv, and the curing distance is 5-20cm; performing heat treatment of the PVA nanofiber membrane, wherein the temperature is 150-250 DEG C, and the time is 1-30min; dissolving trivalent iron salt and bivalent iron salt in water to obtain a mixed solution, wherein the concentration of the trivalent iron salt is 1.5-8wt%, and the concentration of the bivalent iron salt is 0.5-3wt%; putting the PVA nanofiber membrane after the heat treatment into the mixed solution of iron salt, and performing hydrothermal synthesis in N2 atmosphere at the temperature of 50-90 DEG C; dropwise adding an alkaline solution with concentration of 1-10wt% to obtain a PVA nanofiber membrane coated with Fe3O4 nanoparticles; and finally, performing high-temperature calcination at the temperature of 500-900 DEG C to obtain AZO hollow nanofiber. According to the preparation method, the prepared magnetic nanofiber with a hollow structure has the advantages of low cost and uniform morphology.

Description

Technical field [0001] The invention relates to a method for preparing hollow magnetic iron oxide nanofibers, and belongs to the technical field of chemical engineering. Background technique [0002] Magnetic nanomaterials are nanomaterials with unique physical and chemical properties. Because they can be used as excellent high-density magnetic recording materials, electromagnetic wave absorption materials, biological and medical functional materials, the research on magnetic nanomaterials has attracted great attention from scholars from all over the world. . In particular, magnetic nanofibers and nanowire-like materials have a series of advantages such as high aspect ratio, large specific surface area, etc., and are favored by researchers and are considered to be important components for future new types of electrical and magnetic functional materials. At present, there are many methods for preparing nanofibers, such as: AAO template method, hydrothermal method, phase separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D06C7/00
CPCD01F9/08D06C7/00
Inventor 高强鲍纬葛明桥高春霞夏永辉
Owner JIANGNAN UNIV