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Vanadium dioxide metamaterial structure capable of realizing tunable ultra wide band and application of vanadium dioxide metamaterial structure

A vanadium dioxide and metamaterial technology, applied in refrigeration and liquefaction, electrical components, refrigerators, etc., can solve the problems of difficult vanadium dioxide structure processing, low material refrigeration power, weak absorption effect, etc., to achieve simple graphics, The effect of high cooling power and enhanced absorption rate

Active Publication Date: 2021-06-18
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent Publication No. CN111525277A discloses a broadband adjustable wave absorber in which a vanadium dioxide metamaterial is loaded on a dielectric layer. It consists of a metal layer, a dielectric layer As well as an array structure composed of four vanadium dioxide rings with two different radii, the ring structure vanadium dioxide structure is difficult to process and is not conducive to production. The utility model patent with the patent publication number CN209056607U discloses a The electromagnetic metamaterial wave absorber based on vanadium dioxide phase change regulation is composed of two kinds of media and two kinds of vanadium dioxide resonant units stacked in sequence with 9 layers. The multi-layer stacked resonant ring structure also has processing difficulties in experimental preparation. It is beneficial to the production problem, and the above two structures do not involve the research of radiative cooling
[0005] Patent Publication No. CN 110030744 A invention patent discloses a spectrally self-adaptive coating material for solar heat collection during the day and radiation cooling at night. Narrow, and the absorption effect is not strong, and, as a radiation cooling device, the cooling power is a key factor to measure the cooling performance of the device, and the average emissivity of the structure has a great influence on it, the material cooling power of the structure Low

Method used

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  • Vanadium dioxide metamaterial structure capable of realizing tunable ultra wide band and application of vanadium dioxide metamaterial structure
  • Vanadium dioxide metamaterial structure capable of realizing tunable ultra wide band and application of vanadium dioxide metamaterial structure
  • Vanadium dioxide metamaterial structure capable of realizing tunable ultra wide band and application of vanadium dioxide metamaterial structure

Examples

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Embodiment 1

[0042] A vanadium dioxide metamaterial for tunable ultra-broadband, such as Figure 1-3 As shown, including a multi-layer substrate, a patterned vanadium dioxide layer 2 and a top random particle layer 1:

[0043] The base layer includes a silicon dioxide layer 3, a silicon nitride layer 4, and a metal silver layer 5 arranged from top to bottom, and their thicknesses are respectively t 3 =0.1 μm, t 4 =0.5 μm, t 5 =0.2μm;

[0044] The pattern of the patterned vanadium dioxide layer 2 is a continuum array formed by the arrangement of structural units without gaps. The structural units are squares, and L-shaped vanadium dioxide is arranged at the four corners of the square. In the center of the square Correspondingly, a cylinder of vanadium dioxide is provided, and the lengths of the two right-angled sides of the L-type vanadium dioxide are equal, and there is a certain distance between adjacent L-type vanadium dioxide; when the vanadium dioxide is in a metal phase, the metama...

Embodiment 2

[0047] The difference between this embodiment and Embodiment 1 is that, keeping other conditions unchanged, the thickness of the silicon dioxide layer is adjusted to be t 3 =0.1 μm, t 3 =0.15μm,t 3 =0.20μm,t 3 =0.25μm, and measure the emissivity of the material, the result is as Figure 4 shown. Depend on Figure 4 It can be obtained that the thickness of the silicon dioxide layer is t 3 =0.1 μm, the emissivity is higher in the range of 8-16 μm.

Embodiment 3

[0049] The difference between this example and Example 1 is that, keeping other conditions unchanged, the radii of the vanadium dioxide cylinders are adjusted to r=0.2 μm, r=0.3 μm, r=0.4 μm, r=0.5 μm , and measure the emissivity of the material, the result is as Figure 5 shown. Depend on Figure 5 It can be obtained that when the vanadium dioxide cylinder radius r=0.3 μm, the emissivity in the range of 8-16 μm is higher.

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Abstract

The invention provides a vanadium dioxide-based metamaterial structure, and belongs to the field of tunable radiative refrigeration. The structure comprises a graphical vanadium dioxide metamaterial on a multi-layer substrate and a random particle layer on the graphical vanadium dioxide metamaterial. The vanadium dioxide-based metamaterial structure is simple in pattern and efficient in performance, and the radiative cooling performance can be effectively adjusted by utilizing the temperature corresponding characteristics of the vanadium dioxide temperature and modes of external field regulation and control and the like. And when vanadium dioxide is in a metal phase, the structure has very high emissivity and high refrigeration power, can be effectively applied to the fields of coating heat dissipation, intelligent windows and the like, and meets the requirements of energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of metamaterials and radiation cooling, and in particular relates to a vanadium dioxide metamaterial for realizing tunable ultra-broadband and its radiation cooling application. Background technique [0002] The proportion of refrigeration energy consumption in the total energy consumption of society is gradually increasing, and the consumption of earth energy is also increasing. Radiation cooling is to use the principle of thermal radiation to radiate the heat absorbed by objects into the low-temperature outer space through the atmospheric window (8-13 μm) in the form of electromagnetic waves, and at the same time increase the solar spectrum band (0.2-4 μm) as much as possible. reflection, in order to achieve the purpose of cooling the object itself. This technology alleviates the consumption of energy and avoids the pollution of harmful gases in a green cooling way. Therefore, it shows great advantages in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00F25B23/00
CPCH01Q15/0086H01Q15/002F25B23/003
Inventor 范春珍贾渊琳
Owner ZHENGZHOU UNIV
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