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VO2@SiO2 nano particle filling type electro-induced phase change composite material and preparation method thereof

A technology of phase-change composite materials and nanoparticles, which is applied in the field of VO2@SiO2 nanoparticle-filled electro-phase-change composite materials and manufacturing methods, and can solve the problems of unknown influence on electro-phase-change performance

Pending Publication Date: 2021-07-16
ARMY ENG UNIV OF PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen that the oxidation resistance and dispersibility of the vanadium dioxide treated by the surface coating technology have been significantly improved, and the light transmittance has been improved, but the coating treatment is not effective for VO 2 The effect of the electrophase transition properties is still unknown

Method used

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  • VO2@SiO2 nano particle filling type electro-induced phase change composite material and preparation method thereof
  • VO2@SiO2 nano particle filling type electro-induced phase change composite material and preparation method thereof
  • VO2@SiO2 nano particle filling type electro-induced phase change composite material and preparation method thereof

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Embodiment 1

[0045] VO 2 @SiO 2 The preparation method of the nanoparticle-filled electrophase-change composite material comprises the following steps:

[0046] VO 2 (M) Synthesis of nanoparticles:

[0047] First, 1 part of oxalic acid is dispersed in 10 parts of deionized water, and then 0.5 part of vanadium pentoxide is added to the above mixed solution, and after fully stirring and mixing, a yellow solution is obtained.

[0048] Transfer the yellow solution to a 200ml polytetrafluoroethylene-lined stainless steel autoclave, and keep the temperature at 180°C-240°C for 4h-48h. After the constant temperature is finished, cool down to room temperature naturally, wash and filter with absolute ethanol and deionized water respectively, and freeze-dry for 12 hours to obtain blue powder VO 2 (B).

[0049] will get VO 2 (B) The sample is vacuum annealed at 500°C-650°C for 30-90mins in a tube furnace to obtain M-phase VO 2 nanoparticles.

[0050] VO 2 @SiO 2 Synthesis of nanoparticles: ...

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Abstract

The invention discloses a VO2@SiO2 nano particle filling type electro-induced phase change composite material and a preparation method, and relates to the technical field of electro-induced phase change composite materials. The preparation method comprises the following steps of: adding VO2 (M) nanoparticles into a mixed solution of deionized water and absolute ethyl alcohol, dispersing, adding ammonia water, uniformly stirring until the pH value of the solution is 8.7-11.8, then adding an ethyl orthosilicate ethanol solution into the solution while stirring, reacting for 8-24 hours, and carrying out suction filtration, cleaning and vacuum drying to obtain SiO2 coated VO2 nanoparticles, wherein the SiO2 coating thickness is greater than 0 nm and less than or equal to 3 nm; and mixing the SiO2 coated VO2 nanoparticles with a PVP aqueous solution, coating a substrate with the mixture, and drying to obtain the VO2@SiO2 nano particle filling type electro-induced phase change composite material. The preparation method is simple in steps and good in effect; and the phase change nonlinear coefficient of the prepared SiO2 coated VO2 nano particle filled composite material is obviously improved, through SiO2 coating treatment, not only is the oxidation resistance of VO2 improved, but further the electro-phase change performance of VO2 is improved, and research results have important significance for promoting productization application of VO2.

Description

technical field [0001] The invention relates to the technical field of electrophase change composite materials, especially a VO 2 @SiO 2 Nanoparticle-filled electrophase-change composite material and its preparation method. Background technique [0002] In 1949, N.F.Motto predicted the metal-insulator transition (MIT, metal-insulator transition) of metal oxides through energy band theory. In 1959, Morin first discovered single crystal vanadium dioxide (VO 2 ) phase transition phenomenon, since then VO 2 Phase transition properties have become an important topic in the field of condensed matter physics. As a typical strongly correlated system material, it can undergo a unique reversible metal-insulator phase transition (MIT) under the action of temperature, light and voltage. Accompanied by the phase transition, it shows drastic changes in optical, thermal, and magnetic properties. At present, techniques such as magnetron sputtering, molecular beam epitaxy, sol-gel metho...

Claims

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Application Information

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IPC IPC(8): H01L45/00
CPCH10N70/231H10N70/8836H10N70/021Y02E60/14
Inventor 王庆国孙肖宁曲兆明
Owner ARMY ENG UNIV OF PLA
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