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A kind of preparation method and application of graphene-coated nano-dysprosium oxide

A nanometer dysprosium oxide and graphene coating technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of reducing the connectivity between grains, uneven distribution, and poor dispersion. and other problems, to achieve the effect of improving superconductivity, improving reactivity, and inhibiting agglomeration

Active Publication Date: 2018-01-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, doping sources generally have low activity and poor dispersion, and require high heat treatment temperature to introduce effective doping, and the distribution is uneven, and it is easy to reunite at the grain boundary, reducing the connectivity between grains.

Method used

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  • A kind of preparation method and application of graphene-coated nano-dysprosium oxide

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Embodiment 1

[0026] The method for preparing graphene-coated nano-dysprosium oxide in this embodiment comprises the following steps:

[0027] Step 1. Dissolve dysprosium acetate in a mixed solvent of ethanol and propionic acid to obtain a dysprosium acetate solution, place the dysprosium acetate solution in a pyrolysis reactor, and first dry it at a temperature of 120°C. Then, under a moist oxygen atmosphere, continue to heat up to 500°C with a heating rate of 2°C / min to obtain dysprosium oxide nanoparticles; the volume ratio of ethanol and propionic acid in the mixed solvent is 1:1; the moist oxygen The volume percentage of oxygen in the atmosphere is 96.5%, and the balance is water vapor;

[0028] Step 2, dissolving dysprosium nitrate in an aqueous solution of tert-butylamine, and then placing it in a hydrothermal reaction kettle to obtain dysprosium oxide nanocolumns after hydrothermal reaction; in the aqueous solution of tert-butylamine, tert-butylamine and The volume ratio of water i...

Embodiment 2

[0036] The method for preparing graphene-coated nano-dysprosium oxide in this embodiment comprises the following steps:

[0037] Step 1. Dissolve dysprosium acetate in a mixed solvent of ethanol and propionic acid to obtain a dysprosium acetate solution, place the dysprosium acetate solution in a pyrolysis reactor, and first dry it at a temperature of 120°C. Then, under a moist oxygen atmosphere, continue to heat up to 500°C with a heating rate of 5°C / min to obtain dysprosium oxide nanoparticles; the volume ratio of ethanol and propionic acid in the mixed solvent is 1:1; the moist oxygen The volume percentage of oxygen in the atmosphere is 94%, and the balance is water vapor;

[0038] Step 2, dissolving dysprosium nitrate in the aqueous solution of aminoacetic acid, and then placing it in a hydrothermal reaction kettle to obtain dysprosium oxide nanocolumns after the hydrothermal reaction; the volume ratio of aminoacetic acid to water in the aqueous solution of aminoacetic aci...

Embodiment 3

[0045] The method for preparing graphene-coated nano-dysprosium oxide in this embodiment comprises the following steps:

[0046] Step 1. Dissolve dysprosium acetate in a mixed solvent of ethanol and propionic acid to obtain a dysprosium acetate solution, place the dysprosium acetate solution in a pyrolysis reactor, and first dry it at a temperature of 120°C. Then, under a moist oxygen atmosphere, continue to heat up to 500°C with a heating rate of 1°C / min to obtain dysprosium oxide nanoparticles; the volume ratio of ethanol and propionic acid in the mixed solvent is 1:1; the moist oxygen The volume percentage of oxygen in the atmosphere is 99.4%, and the balance is water vapor;

[0047] Step 2, dissolving dysprosium nitrate in an aqueous solution of tert-butylamine, and then placing it in a hydrothermal reaction kettle to obtain dysprosium oxide nanocolumns after hydrothermal reaction; in the aqueous solution of tert-butylamine, tert-butylamine and The volume ratio of water i...

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Abstract

The invention provides a preparation method of graphene-coated nano dysprosium oxide. The method comprises the following steps that dysprosium oxide nanoparticles are prepared through a pyrolysis method; 2, dysprosium oxide nanometer columns are prepared through a hydrothermal method; 3, a graphene oxide solution is prepared; 4, the dysprosium oxide nanoparticles and the dysprosium oxide nanometer columns are added into the graphene oxide solution, stirring and filtering are conducted in sequence, filter residues are obtained, and the filter residues are subjected to heat treatment to obtain graphene-coated nano dysprosium oxide. In addition, the invention provides application of graphene-coated nano dysprosium oxide prepared through the method in the process of preparing two-element-doped magnesium diboride superconducting bulk materials. According to the preparation method, the technological method is simple, graphene with high surface area is adopted as a coating, the dysprosium oxide nanoparticles and the dysprosium oxide nanometer columns can be uniformly dispersed on the graphene without generating agglomeration, and the critical current density Jc performance of the two-element-doped magnesium diboride superconducting bulk materials in a low field and a high field can be improved conveniently.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting materials, and in particular relates to a preparation method and application of graphene-coated nano-dysprosium oxide. Background technique [0002] Rare earth oxide dysprosium oxide (Dy 2 o 3 ) has excellent physical and chemical properties, and is widely used in catalytic materials, luminescent materials, solid fuel cells, pinned magnesium diboride superconductors and other fields. When the size of dysprosium oxide particles is gradually reduced to nanometer size, the specific surface area increases to produce surface effects, and the different surface structures of nano-dysprosium oxide lead to inconsistent reactivity. In traditional preparation methods, nano-oxides are prone to agglomeration, and it is difficult to obtain a highly active surface. [0003] At the same time, for the magnesium diboride superconducting material, in order to improve the performance of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C04B35/58C04B35/622
CPCC01F17/206C01P2004/60C01P2004/80C04B35/58057C04B35/622C04B2235/3224C04B2235/425C04B2235/5445C04B2235/658
Inventor 金利华王耀冯建情李成山刘国庆刘浩然熊晓梅王庆阳杨芳张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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