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Method for preparing ferrite nano fiber

A nanofiber and ferrite technology, applied in fiber processing, spinning solution preparation, textile and papermaking, etc., can solve problems such as limiting fiber application, structural defects, affecting fiber crystal structure fiber surface structure, etc., to reduce dosage, The effect of improving magnetic performance and wide applicability

Inactive Publication Date: 2013-08-14
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods all have some common problems, such as the use of a large amount of organic solvents or complexing agents in the preparation process, these organics are discharged during high-temperature calcination, and the volatilization of organics will cause a large number of structural defects to be formed inside and on the surface of the fiber, thereby It affects the crystal structure of the fiber and the surface structure of the fiber, which limits the application of the fiber in the field of microwave absorbing materials and magnetic recording materials

Method used

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  • Method for preparing ferrite nano fiber
  • Method for preparing ferrite nano fiber
  • Method for preparing ferrite nano fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The process for preparing ferrite nanofibers is as follows: figure 1 shown.

[0024] Step 1: Add 0.50g of polyvinylpyrrolidone (PVP) into 4.5g of absolute ethanol, and stir the polymer for about 5 hours to completely dissolve the polymer to obtain a PVP ethanol solution. 27.2g ferric nitrate (Fe(NO 3 ) 3 9H 2 (2), 18.1g citric acid are dissolved in deionized water, 1.1g barium carbonate (BaCO 3 ) was dissolved in glacial acetic acid aqueous solution, and magnetically stirred for 1 hour until completely dissolved. The resulting metal salt solution was evaporated to a viscous sol in a rotary evaporator. Dissolve the obtained sol in the PVP ethanol solution, then add an appropriate amount of water to make the concentration of PVP 4wt%, and stir evenly to form a stable precursor solution;

[0025] Step 2: Transfer the obtained precursor solution to a plastic syringe with a stainless steel needle with an outer diameter of 0.6 mm. The distance between the needle and th...

Embodiment 2

[0028] Step 1: Add 1.0 g of polyvinylpyrrolidone (PVP) into 6.0 g of deionized water, and stir the polymer for about 5 hours to completely dissolve the polymer to obtain a PVP aqueous solution. 27.2g ferric nitrate (Fe(NO 3 ) 3 9H 2 (O), 19.5g citric acid, 2.87g barium nitrate (Ba(NO 3 ) 2 ) was dissolved in deionized water and magnetically stirred until completely dissolved. The resulting metal salt solution was evaporated to a viscous sol in a rotary evaporator. Dissolve the obtained sol in the PVP aqueous solution, adjust the concentration of PVP to 6wt%, and stir evenly to form a stable precursor solution;

[0029] Step 2: same as embodiment 1;

[0030] Step 3: Place the dried precursor fiber in an alumina crucible, raise the temperature to 800°C at a rate of 3°C / min in an air atmosphere, keep it warm for 2 hours, and naturally cool to room temperature to obtain a fiber with a diameter of about 100nm. The barium ferrite nanofibers, the SEM and magnetic properties of...

Embodiment 3

[0032] Step 1: Add 1.0 g of polyvinyl alcohol (PVA) into 6 g of absolute ethanol, and stir the polymer for about 5 hours to completely dissolve the polymer to obtain a PVA ethanol solution. 27.2g ferric nitrate (Fe(NO 3 ) 3 9H 2 (O), 14.5g citric acid, 2.87g barium nitrate (Ba(NO 3 ) 2 ) was dissolved in deionized water and magnetically stirred for 1 hour until completely dissolved. The resulting metal salt solution was evaporated to a viscous sol in a rotary evaporator. Dissolving the obtained sol in PVA ethanol solution, adding an appropriate amount of water so that the concentration of PVA is 8wt%, stirring evenly to form a stable precursor solution;

[0033] Step 2: same as embodiment 1;

[0034] Step 3: Place the dried precursor fiber in an alumina crucible, raise the temperature to 900°C at a rate of 3°C / min in an air atmosphere, keep it warm for 2 hours, and cool naturally to room temperature to obtain a fiber with a diameter of about 100nm. barium ferrite nanofi...

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Abstract

The invention discloses a method for preparing a ferrite nano fiber. The method comprises the following steps of: dissolving metal salt which can form ferrite into glacial acetic acid, adding deionized water to obtain metal salt solution; weighing Fe(3+) salt and dissolving the Fe(3+) salt into the deionized water; evenly stirring to obtain Fe(3+) salt solution; weighing citric acid according to a certain ratio, dissolving the citric acid in the Fe(3+) salt solution, mixing the obtained solution with metal salt solution, and then evaporating the obtained solution to form collosol; weighing an organic complexing agent, and dissolving the organic complexing agent into absolute ethyl alcohol or deionized water, so as to obtain organic complexing agent solution; adding the obtained gel to the obtained organic complexing agent solution and evenly agitating, so as to obtain spinnable precursor solution; carrying out electrostatic spinning to prepare a precursor fiber; and then drying, and burning for 1-3 hours in air atmosphere at 700-1000 DEG C, so as to obtain the ferrite nano fiber. The ferrite nano fiber with high performance disclosed by the invention can be used as a magnetic recording material, an electromagnetic microwave absorber and a structural wave-absorbing material.

Description

technical field [0001] The invention belongs to the field of preparation of nanofibers, in particular to a method for preparing ferrite nanofibers. Background technique [0002] M-type barium ferrite has a typical P6 3 The / mmc space structure has the characteristics of high saturation magnetization, large coercive force, good chemical stability and corrosion resistance, and is widely used in high-density perpendicular magnetic recording materials, magneto-optical recording materials and microwave devices. In particular, the rapid development of microwave communication, electronic technology and stealth technology in the military field has put forward higher and higher requirements for the performance of microwave-absorbing materials. M-type barium ferrite is considered to be the best electromagnetic wave absorber because of its high magnetocrystalline anisotropy equivalent field and natural resonance frequency. However, the traditional M-type ferrite powder material has s...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01D5/00D01D1/02
Inventor 孟献丰甄美荣纪永康沈湘黔
Owner JIANGSU UNIV
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