Superfine nickel fiber and preparation method thereof

A technology of nickel fiber and nickel salt, which is applied in the field of new one-dimensional magnetic materials and new microwave absorbing materials, can solve the problems of restricting the application research of ultrafine nickel fibers, unfavorable industrial scale-up preparation, complicated purification process, etc., and achieve large-scale and various The effects of anisotropy, cheap raw materials, and simple process

Inactive Publication Date: 2010-09-01
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have complex purification processes, high costs and low yields, which are not conducive to their industrial scale-up preparation, which greatly limits the application research of ultrafine nickel fibers

Method used

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  • Superfine nickel fiber and preparation method thereof
  • Superfine nickel fiber and preparation method thereof
  • Superfine nickel fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Nickel chloride hexahydrate NiCl 2 ·6H 2 O was completely dissolved in 50ml ethylene glycol, NiCl 2 ·6H 2 The concentration of O is 0.01M, add 1ml of 80wt% H to the above solution 4 N 2 ·H 2 O solution and 0.3g NaOH particles were mixed thoroughly. After mixing, the solution was slowly heated to 55°C and kept at this temperature for 15 minutes, and then the reactant was naturally cooled to room temperature. The black product is separated magnetically, washed three times with absolute ethanol, and dried in vacuum to obtain pure ultrafine nickel fibers.

Embodiment 2

[0053] Nickel chloride hexahydrate NiCl2 ·6H 2 O was completely dissolved in 50ml ethylene glycol, NiCl 2 ·6H 2 The concentration of O is 0.02M, add 3ml of 80wt% H to the above solution 4 N 2 ·H 2 O solution and 0.40g NaOH particles were mixed thoroughly. After mixing, the solution was slowly heated to 55°C and kept at this temperature for 20 minutes, and then the reactant was naturally cooled to room temperature. The black product is separated by suction filtration, washed three times with absolute ethanol, and dried in vacuum to obtain pure ultrafine nickel fibers.

Embodiment 3

[0055] Nickel chloride hexahydrate NiCl 2 ·6H 2 O was completely dissolved in 50ml ethylene glycol, NiCl 2 ·6H 2 The concentration of O is 0.05M, add 3ml of 80wt% H to the above solution 4 N 2 ·H 2 O solution and 1.5g NaOH particles were mixed thoroughly. After mixing, the solution was slowly heated to 55°C and kept at this temperature for 30 minutes, and then the reactant was naturally cooled to room temperature. The black product is separated magnetically, washed three times with absolute ethanol, and dried in vacuum to obtain pure ultrafine nickel fibers.

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Abstract

The invention belongs to the technical fields of novel one-dimensional magnetic materials and novel microwave absorption materials, in particular to a superfine nickel fiber and a preparation method thereof. The diameter of the nickel fiber is between 100 and 600nm, and the length is between 10 and 100 mu m. Inorganic and organic nickel salt and hydrazine hydrate react in an alcohol solvent at the temperature of between 45 and 90 DEG C for 10 to 120 minutes under the alkaline condition, and the superfine nickel fiber is obtained through separation and purification after temperature reduction. The pure superfine fibrous nickel with uniform appearance and large length-diameter ratio can be prepared without introducing templates or introducing externally applied magnetic field to the reaction system. The method for preparing the superfine nickel fiber has the advantages of low cost of the used raw materials, safety, simple process, short period, mild preparation condition, low production cost, high yield, and suitability for scale production.

Description

(1) Technical field [0001] The invention belongs to the technical field of novel one-dimensional magnetic materials and novel microwave absorbing materials, and in particular relates to an ultrafine nickel fiber and a preparation method thereof. (2) Background technology [0002] The current metal fiber preparation methods mainly include melt spinning, mechanical cutting method, monofilament drawing method and cluster drawing method, etc. These methods are all physical methods in essence. These methods are relatively mature for the preparation of metal fibers above 4 μm, but it is very difficult to prepare metal fibers of 2 μm to 4 μm, and the technical limit of the wire diameter is also above 1 μm. As far as the development of microwave absorbing materials is concerned, magnetic metal fibers (such as iron, nickel, cobalt and their alloy fibers, etc.) are one of the research hotspots in the field of microwave absorbers in recent years. In the microwave frequency band, due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 龚春红张经纬李志伟张玉阎超余来贵吴志申张治军
Owner HENAN UNIVERSITY
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