Preparation method of ultrafine vanadium dioxide powder

A technology of ultra-fine powder and vanadium dioxide, which is applied in the direction of vanadium oxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of increasing production costs and easy introduction of impurities, and achieve low cost and broad Market prospect, wide application effect

Active Publication Date: 2015-11-04
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore in order to get VO 2 Ultrafine powder, usually need to increase VO after high temperature heat treatment 2 Powdering process, which will inevitably increase the production cost, and also easily introduce impurities

Method used

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  • Preparation method of ultrafine vanadium dioxide powder
  • Preparation method of ultrafine vanadium dioxide powder
  • Preparation method of ultrafine vanadium dioxide powder

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preparation example Construction

[0033] A preparation method of vanadium dioxide ultrafine powder includes the following steps:

[0034] Step 1: Preparation of product precursor

[0035] Vanadium sulfate trihydrate VOSO 4 ·3H 2 O was dissolved in distilled water, and then an alkaline solution was added, and the pH of the solution was slowly adjusted to 6-7 to obtain an off-white suspension; the suspension was filtered and cleaned to obtain an amorphous product precursor; the product precursor was put into vacuum Drying is carried out in a drying oven, the drying temperature is 60-80°C, and the drying time is 24-48h to obtain a dry, loose, non-caking precursor powder, and the obtained precursor powder has a mesh number greater than 1000 mesh. The soluble hexavalent tungsten compound used is one or more of sodium tungstate, ammonium tungstate or tungstic acid, and the alkaline solution used is one of sodium hydroxide, sodium carbonate, sodium bicarbonate or aqueous ammonia Or multiple.

[0036] Step 2: Preparation o...

Embodiment 1

[0045] A preparation method of vanadium dioxide ultrafine powder includes the following steps:

[0046] Step 1: Preparation of product precursor

[0047] Vanadium sulfate trihydrate VOSO 4 ·3H 2 O is dissolved in distilled water, and 0.01mol / L dilute NaHCO 3 The solution is added dropwise to the continuously stirred VOSO at a rate of 50mL / h with a syringe pump 4 In the solution, control the pH value in the range of 6-7 to obtain an off-white suspension; the suspension is filtered and cleaned to obtain an amorphous product precursor; the product precursor is placed in a vacuum drying oven for drying, and the drying temperature is 80 ℃, the drying time is 24h, to obtain a dry, loose, non-caking precursor powder, and the obtained precursor powder has a mesh number greater than 1000 mesh. The soluble hexavalent tungsten compound used is one or more of sodium tungstate, ammonium tungstate or tungstic acid, and the alkaline solution used is one of sodium hydroxide, sodium carbonate, sodi...

Embodiment 2

[0057] A preparation method of vanadium dioxide ultrafine powder includes the following steps:

[0058] Step 1: Preparation of product precursor

[0059] Vanadium sulfate trihydrate VOSO 4 ·3H 2 O is dissolved in distilled water, and 0.01mol / L dilute NaHCO 3 The solution is added dropwise to the continuously stirred VOSO at a rate of 50mL / h with a syringe pump 4 In the solution, control the pH value in the range of 6-7 to obtain an off-white suspension; filter the suspension to obtain an amorphous product precursor; put the product precursor in a vacuum drying oven for drying, and the drying temperature is 80 ℃, the drying time is 24h, to obtain a dry, loose, non-caking precursor powder, and the obtained precursor powder has a mesh number greater than 1000 mesh. The soluble hexavalent tungsten compound used is one or more of sodium tungstate, ammonium tungstate or tungstic acid, and the alkaline solution used is one of sodium hydroxide, sodium carbonate, sodium bicarbonate or aqueo...

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Abstract

The invention relates to a preparation method of ultrafine vanadium dioxide powder. The preparation method comprises steps as follows: Step 1, dissolving vanadyl sulfate trihydrate in distilled water, adding an alkaline solution, adjusting the PH of the solution to range from 6 to 7 to obtain a suspension, and performing suction filtration, cleaning and drying to obtain product precursor powder; Step 2, crushing silicon dioxide aerogel and screening out silicon dioxide aerogel powder by a screen; Step 3, mixing the product precursor powder obtained in Step 1 with the silicon dioxide aerogel powder obtained in Step 2 in the weight ratio being (1-10):1 to obtain mixed powder, Step 4, performing heat treatment on the mixed powder obtained in Step 3 under the protection of inertial gas and then cooling the mixed powder, wherein the heat treatment temperature is in a range of 600-1000 DEG C and the heat treatment time is in a range of 3-8 h; Step 5, screening the mixed powder cooled in Step 4 by a screen of 1000-3000 meshes to remove large-particle silicon dioxide aerogel powder.

Description

Technical field [0001] The invention relates to a preparation method of vanadium dioxide powder, in particular to a preparation method of vanadium dioxide ultrafine powder. Background technique [0002] Vanadium dioxide (VO 2 ) Is a thermally induced phase change metal compound, which changes from a low-temperature semiconductor phase to a high-temperature metal phase near 68°C. During the phase transition, the resistance of the material undergoes a sudden change of 2 to 4 orders of magnitude, accompanied by sudden changes in the optical refractive index, transmittance, and reflectivity, especially in the infrared and near-infrared bands. Below the phase transition temperature, VO 2 The infrared and near-infrared transmittance is higher; but when the temperature is higher than the phase transition temperature, VO 2 The transmittance of infrared and near-infrared has a significant drop. Based on its physical characteristics, it can be used to intelligently control infrared transm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82Y30/00
Inventor 吴会军陈奇良周孝清何清衡
Owner GUANGZHOU UNIVERSITY
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