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A magnesium fluoride-coated vanadium dioxide core-shell composite powder and its preparation method

A technology of vanadium dioxide and composite powder, applied in magnesium fluoride, vanadium oxide, magnesium halide and other directions, to achieve the effect of improving oxidation resistance, preventing shell cracking and low refractive index

Active Publication Date: 2021-04-16
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application publication number CN108002442A discloses an amorphous alumina-coated vanadium dioxide nanopowder and its preparation method. The amorphous alumina is coated on the surface of the vanadium dioxide inner core, which can prevent the crystalline alumina from being crystallized due to grain orientation. Different conditions lead to cracking of the shell, and the alumina layer is coated, which can improve the stability of the vanadium dioxide core, but this method needs to be added to promote the decomposition of the precipitant during preparation, and the product still needs annealing treatment

Method used

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  • A magnesium fluoride-coated vanadium dioxide core-shell composite powder and its preparation method
  • A magnesium fluoride-coated vanadium dioxide core-shell composite powder and its preparation method
  • A magnesium fluoride-coated vanadium dioxide core-shell composite powder and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1 (water is reaction solvent)

[0044] (1) Weigh 0.3 g of vanadium dioxide and ultrasonically disperse it in 30 mL of deionized water, and the ultrasonic time is 30 min. Obtain the dispersion liquid of vanadium dioxide;

[0045] (2) Dissolve 0.294g of magnesium chloride hexahydrate in 10mL of water to obtain a magnesium source solution. Add the magnesium source solution to the vanadium dioxide aqueous solution in a magnetic stirrer. After the completion, after it was stirred for 30 minutes, the solution was ultrasonicated for 10 minutes;

[0046] (3) Dissolve 0.107g of ammonium fluoride (Mg:F=1:2) in 10mL of water to obtain a precipitant solution. Slowly add the precipitating agent solution dropwise to the vanadium dioxide solution containing the magnesium source at a rate of 2ml / min;

[0047] (4) The whole system was reacted at 20°C for 1 hour, then centrifuged, washed with water and ethanol, and dried at 70°C. Get VO 2 @MgF 2 Core-shell nanopowder. ...

Embodiment 2

[0048] Embodiment 2 (ethylene glycol is reaction solvent)

[0049] (1) Weigh 0.25g of vanadium dioxide and ultrasonically disperse it in 30g of ethylene glycol, and the ultrasonic time is 30min. Obtain the dispersion liquid of vanadium dioxide;

[0050] (2) Dissolve 0.386g of magnesium nitrate hexahydrate in 10mL of ethylene glycol to obtain a magnesium source solution. Add the magnesium source solution to the vanadium dioxide aqueous solution in a magnetic stirrer. After the completion, after it was stirred for 30 minutes, the solution was ultrasonicated for 10 minutes;

[0051] (3) Dissolve 0.139 g of ammonium fluoride (Mg:F=1:2) in 10 mL of ethylene glycol to obtain a precipitant solution. Slowly add the precipitating agent solution dropwise to the vanadium dioxide solution containing the magnesium source at a rate of 2ml / min;

[0052] (4) After reacting at 20°C for 1 hour, the whole system was centrifuged, washed with water and ethanol, and dried at 70°C. Get VO 2 @M...

Embodiment 3

[0053] Embodiment 3 (annealing treatment after reaction)

[0054] (1) prepare VO by the method for embodiment 1 2 @MgF 2 Core-shell nanopowder;

[0055] (2) Rapidly anneal the powder in vacuum. The heating rate is 10°C / s, the temperature is raised to 400°C and annealed for 30min. After it is cooled to room temperature, an annealed powder is obtained after coating.

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Abstract

The invention relates to a magnesium fluoride-coated vanadium dioxide core-shell composite powder and a preparation method thereof. The magnesium fluoride-coated vanadium dioxide core-shell composite powder comprises a For the magnesium fluoride layer on the surface of the vanadium dioxide core, the material ratio of the vanadium dioxide core and the magnesium fluoride layer is 1:(0.1-2), preferably 1:(0.5-1).

Description

technical field [0001] The invention relates to a magnesium fluoride-coated vanadium dioxide core-shell composite powder and a preparation method thereof, belonging to the technical fields of chemical material synthesis and functional materials, and in particular to the field of vanadium dioxide core-shell coating. Background technique [0002] The problem of global energy shortage is becoming more and more serious, and excessive carbon emissions are causing the environment to deteriorate day by day. Energy conservation and emission reduction have become the top priority of all countries. It is estimated that building energy consumption accounts for more than 1 / 3 of the total energy consumption in society. Therefore, promoting building energy conservation is one of the key measures for energy conservation, emission reduction and sustainable development. A large part of building energy consumption is used for air conditioning, and glass windows, as the main channel for heat e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02C01F5/28B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F5/28C01G31/02C01P2004/64C01P2004/80
Inventor 黄爱彬赵书文纪士东金平实周奕杰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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