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Preparation method of M phase vanadium dioxide powder, and temperature control layer

A technology of vanadium dioxide and vanadium pentoxide, applied in vanadium oxide, nanotechnology and other directions, can solve the problems of complex preparation and high energy consumption, and achieve the effects of small particles, low energy consumption and good crystallinity

Inactive Publication Date: 2019-08-16
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the embodiment of the present application includes providing a method for preparing M-phase vanadium dioxide powder and a temperature control layer, which improves the technical problems of complex preparation and high energy consumption

Method used

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  • Preparation method of M phase vanadium dioxide powder, and temperature control layer
  • Preparation method of M phase vanadium dioxide powder, and temperature control layer
  • Preparation method of M phase vanadium dioxide powder, and temperature control layer

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preparation example Construction

[0036] The embodiment of this application proposes a preparation method of M-phase vanadium dioxide powder, which includes: ball milling or grinding vanadium pentoxide to obtain vanadium pentoxide powder with a particle size of 50-300 nm, and under the protection of inert gas, the temperature Anneal the vanadium pentoxide powder at 500-700℃ for at least 30min. figure 1 It is a schematic flow chart of the preparation method of M phase vanadium dioxide powder provided in this application.

[0037] The vanadium pentoxide used in this application is obtained through purchase, and the purchased vanadium pentoxide is in powder form. However, according to experimental research, directly annealing the existing vanadium pentoxide below 700° C. cannot obtain M-phase vanadium dioxide. After research, the inventor of the present application found that the particle size of vanadium pentoxide affects the thermal decomposition of vanadium pentoxide, which in turn affects the preparation of M ph...

Embodiment 1

[0049] This embodiment provides a method for preparing M-phase vanadium dioxide powder, which includes the following steps:

[0050] 1) Take 4g vanadium pentoxide powder and disperse in 50ml methanol;

[0051] 2) Transfer the alcohol solvent to the ball mill tank, the ball mill speed is 400r / min, the ball mill is 60h to obtain the vanadium pentoxide slurry, the slurry is dried at 60℃, and the dried product is ground to obtain the powder again. The particle size of the powder About 300nm;

[0052] 3) The vanadium pentoxide powder obtained after ball milling is annealed at 600°C for 60 minutes under the protection of nitrogen to obtain the powder.

Embodiment 2

[0054] This embodiment provides a method for preparing M-phase vanadium dioxide powder, which includes the following steps:

[0055] 1) Take 9g vanadium pentoxide powder and disperse it in 100ml ethanol;

[0056] 2) Transfer the alcohol solvent to the ball mill tank, the ball mill speed is 700r / min, and the ball mill is 30h to obtain the vanadium pentoxide slurry. The slurry is dried at 70℃, and the dried product is ground to obtain the powder again. The particle size of the powder About 200nm;

[0057] 3) The vanadium pentoxide powder obtained after ball milling is annealed at 500°C for 90 minutes under the protection of argon gas to obtain M-phase vanadium dioxide powder.

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Abstract

The invention relates to a preparation method of an M phase vanadium dioxide powder, and a temperature control layer, and belongs to the technical field of thermotropic phase transition materials. Thepreparation method of the M phase vanadium dioxide powder comprises the following steps: ball-milling or grinding vanadium pentoxide to obtain a vanadium pentoxide powder having a particle size of 50-300 nm, and annealing the vanadium pentoxide powder at a temperature of 500-700 DEG C under the protection of an inert gas for at least 30 min. The vanadium pentoxide having the particle size of 50-300 nm is adopted as the raw material, no reducing agent is added, the vanadium pentoxide powder is directly annealed at 500-700 DEG C to prepare the M phase vanadium dioxide powder, and the M phase vanadium dioxide powder has the advantages of good crystallinity, small particle size and high purity. The preparation method has the advantages of great simplification of process steps, low energy consumption, no generation of waste liquids such as an acid liquid in the preparation process, and reduction of the cost.

Description

Technical field [0001] This application relates to the technical field of thermally induced phase change materials, and in particular to a method for preparing M phase vanadium dioxide powder and a temperature control layer. Background technique [0002] Vanadium dioxide is a typical thermally induced phase change material, with good semiconductor-metal phase transition characteristics, and the phase transition temperature is 341K (68°C). At the phase transition temperature, vanadium dioxide changes from a low-temperature semiconductor phase to a high-temperature metal phase. The structure, electrical and optical properties of the material will change significantly in an instant, and the changes of these properties with temperature are all reversible. This also makes vanadium dioxide have a wide range of application prospects in smart windows, thermal switches, and laser protection. [0003] Most of the existing M-phase vanadium dioxide powders are prepared by reducing acids, and ...

Claims

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Application Information

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IPC IPC(8): C01G31/02B82Y40/00
CPCB82Y40/00C01G31/02C01P2002/72C01P2004/03C01P2004/64
Inventor 赵丽陆芳夏敬旺董兵海王世敏胡忠明陈慧童颜
Owner HUBEI UNIV
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