CN209836290U - Three-dimensional conical nano-layer membrane structure - Google Patents
Three-dimensional conical nano-layer membrane structure Download PDFInfo
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Abstract
The utility model belongs to the new forms of energy technical development field especially relates to a three-dimensional toper nanometer tunic structure. The utility model provides a three-dimensional toper nanometer tunic structure, be: the silicon dioxide-hafnium oxide composite layer is arranged above the hafnium oxide layer; the number of the silicon dioxide-hafnium dioxide composite layers is more than 10, and the silicon dioxide-hafnium dioxide composite layers are arranged above the silver layers. In the utility model, the three-dimensional conical nano-layer film structure is introduced, so that high-performance double-window atmospheric radiation can be realized, and finally, the high-efficiency passive radiation cooling capacity can be realized; the technical defect that the daytime cooling method is low in net radiation cooling power in the prior art is overcome.
Description
Technical Field
The utility model belongs to the new forms of energy technical development field especially relates to a three-dimensional toper nanometer tunic structure.
Background
Energy crisis and environmental pollution are two major problems faced in the world today, and research and development of new energy, new methods and new technologies with low pollution and low energy consumption is an urgent task. According to the principle of thermodynamics, natural large-capacity cold sources can also be used as energy, for example, the water below the iceberg and deep sea of the two poles of the earth is the cold source, but the use is limited by objective conditions or the cost is too high. In the absence of a medium, two objects having a temperature difference can exchange energy in the form of radiation, and the temperatures of the two objects are eventually equal. The huge space volume in the universe makes it a hot 'black hole', if unnecessary heat is released from the ground to the space in the form of electromagnetic waves, the purpose of refrigeration can be achieved, and radiation cooling is one of the cooling modes without energy consumption.
The atmosphere of the earth is provided with two highly transparent windows which are respectively in the infrared wave bands of 8-13 mu m and 16-26 mu m, the radiation of the atmosphere in the wave band of the atmospheric window is weak, and the atmosphere of the earth is highly radiated outside the atmospheric window. According to Planck's law, the peak value of the heat radiation of a black body is just within 8-13 μm of the atmospheric window under the ambient temperature (about 300K), and the characteristic makes the passive radiation cooling mechanism possible.
The skilled person has conducted extensive theoretical studies on night-time radiative cooling and successfully verified the feasibility thereof through various studies, proposing polymers, pigment coatings, metal oxides and gas plates, and multilayer semiconductor and metal dielectric photonic structural films for night-time radiative cooling. However, the greatest cooling requirements typically occur during direct sunlight during the day, and achieving daytime radiant cooling is more challenging due to the incident solar radiation.
In the prior art, daytime cooling is achieved by covering the cooler with a solar reflector, and blocking unwanted spectra from reaching the cooler by a partially transparent barrier layer (e.g., a polyethylene or ethylene copolymer foil with reflective pigments and fuel). However, the gradual cooling method in the prior art can achieve the purpose of radiation cooling, but does not show good infrared radiation selectivity and high-performance infrared absorption capacity in an atmospheric window, thereby resulting in low net radiation cooling power.
Therefore, a three-dimensional tapered nanolayer film structure has been developed to solve the technical defect of low net radiative cooling power of the daytime cooling method in the prior art, and the problem to be solved by those skilled in the art is urgently needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a three-dimensional toper nanometer tunic structure for solve prior art, there is the lower technical defect of net radiant cooling power in the method of daytime cooling.
The utility model provides a three-dimensional toper nanometer tunic structure, three-dimensional toper nanometer tunic structure is: the silicon dioxide-hafnium oxide composite layer is arranged above the hafnium oxide layer;
the number of the silicon dioxide-hafnium dioxide composite layers is more than 10, and a plurality of the silicon dioxide-hafnium dioxide composite layers are arranged above the silver layer.
Preferably, the thickness of the silver layer is 120nm to 200 nm.
Preferably, the thickness of the silicon dioxide layer is 1.8 μm to 2.0 μm.
Preferably, the thickness of the hafnium oxide layer is 150nm to 200 nm.
Preferably, the width of the bottom of the three-dimensional tapered nanolayer film structure is 10 to 11 μm, and the width of the top of the three-dimensional tapered nanolayer film structure is 1.5 to 2 μm.
Preferably, the three-dimensional tapered nanolayer film structure further comprises: the substrate layer is arranged on the lower portion of the silver layer and is a silicon wafer layer.
Preferably, the distance between adjacent three-dimensional tapered nanolayer film structures is the same as the width of the bottom of a single three-dimensional tapered nanolayer film structure.
Preferably, the number of the silicon dioxide-hafnium dioxide composite layers is 10-20.
To sum up, the utility model provides a three-dimensional toper nanometer tunic structure, be: the silicon dioxide-hafnium oxide composite layer is arranged above the hafnium oxide layer; the number of the silicon dioxide-hafnium dioxide composite layers is more than 10, and a plurality of the silicon dioxide-hafnium dioxide composite layers are arranged above the silver layer. In the technical scheme provided by the utility model, the three-dimensional conical nano-layer film structure is introduced, so that high-performance double-window atmospheric radiation can be realized, and finally, the high-efficiency passive radiation cooling capacity can be realized; through calculating, the utility model provides a technical scheme gained product, under the condition that sunshine penetrates directly, can reflect more than 95% solar spectrum to can realize the high infrared absorption of double-window. Can reach more than 156W/m in the daytime and at night respectively2And 199W/m2And when the ambient temperature is 300K, it is possible to reach an equilibrium temperature of 257.6K and 241.5K during the day and night, respectively. The utility model provides a pair of three-dimensional toper nanometer tunic structure has solved prior art, and there is the lower technical defect of net radiation cooling power in daytime cooling's method。
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic view of a three-dimensional tapered nanolayer membrane structure provided by the present invention;
wherein, a silver layer 1, a hafnium oxide layer 2 and a silicon dioxide layer 3.
Detailed Description
The embodiment of the utility model provides a three-dimensional toper nanometer tunic structure for among the solution prior art, there is the lower technical defect of net radiation cooling power in daytime refrigerated method.
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
To illustrate the present invention in more detail, the following embodiment is used to describe the three-dimensional tapered nano-layer film structure provided by the present invention specifically.
Referring to fig. 1, the present invention provides a three-dimensional tapered nano-layer film structure, which comprises: the silicon dioxide-hafnium oxide composite layer is arranged above the hafnium oxide layer; the number of the silicon dioxide-hafnium dioxide composite layers is more than 10, and a plurality of silicon dioxide-hafnium dioxide composite layers are arranged above the silver layer. The utility model provides a pair of three-dimensional toper nanometer tunic structure has solved prior art, and there is the lower technical defect of net radiation cooling power in daytime refrigerated method.
The embodiment of the utility model provides an among the technical scheme, two kinds of non-metallic medium-hafnia and silica have been used, wherein, hafnia has high refractive index, the absorptive characteristic of low ultraviolet, has certain inhibiting action to the absorption of sunlight, and the silica refractive index is low, optics is transparent, and its absorption peak is about 9 mu m, introduces the stronger material of absorption in 8 ~ 13 mu m's atmospheric window scope, can improve the radiance.
Furthermore, the three-dimensional pyramid-shaped nano multilayer film structure can form a moth-eye effect, further enhance the infrared absorption characteristic, achieve high reflection of a solar spectrum in a wave band of 0.3-4 mu m, and realize high absorption in two atmospheric windows of 8-13 mu m and 16-26 mu m.
The embodiment of the utility model provides an among the technical scheme, through three-dimensional toper nanometer stratiform membrane structure, can realize the two-window atmosphere radiation of high performance, overcome metal material to solar spectrum's high loss for the cooler realizes passive cooling under the condition that sunshine penetrates directly daytime.
And simultaneously, the embodiment of the utility model provides a structure can also realize the high infrared absorption of two windows when reaching the high reflection of solar spectrum to the realization reaches efficient cooling power and lower equilibrium temperature relatively under the condition of sunshine direct injection daytime. Through calculating, the utility model provides a technical scheme gained product, under the condition that sunshine penetrates directly, can reflect more than 95% solar spectrum to can realize the high infrared absorption of double-window. Can reach more than 156W/m in the daytime and at night respectively2And 199W/m2And when the ambient temperature is 300K, it is possible to reach an equilibrium temperature of 257.6K and 241.5K during the day and night, respectively.
In order to ensure that the silver layer can fully reflect sunlight, the embodiment of the utility model provides an among the three-dimensional toper nanometer layer membrane structure, the thickness of silver layer is 120nm ~ 200 nm.
Match according to two refracting indexes of silica and hafnia and thickness, produce the resonance absorption, further improve the absorptivity of atmospheric window, the embodiment of the utility model provides an among the technical scheme, the thickness on silica layer is 1.8 mu m ~ 2.0 mu m, and the thickness on hafnia layer is 150nm ~ 200 nm.
Further optimize technical scheme, better utilize moth eye effect, reduce the reflection of atmospheric window wave band, the embodiment of the utility model provides an in the three-dimensional toper nanometer stratigraphic membrane structure, the bottom width of three-dimensional toper nanometer stratigraphic membrane structure is 10 mu m ~ 11 mu m, and the top width of three-dimensional toper nanometer stratigraphic membrane structure is 1.5 mu m ~ 2 mu m.
The embodiment of the utility model provides a three-dimensional toper nanometer lamellar film structure still includes: the substrate layer is arranged at the lower part of the silver layer and is a silicon layer; the substrate layer serves as a substrate and can play a good supporting role.
For effectively ensure that the structure size of design is the subwavelength structure of 8 ~ 13 mu m of atmospheric transmission window and 16 ~ 26 mu m wave bands to improve the structure to the absorptive capacity of atmospheric window wave band, the embodiment of the utility model provides an among the technical scheme, the interval of adjacent three-dimensional toper nanometer tunic structure is the same with the bottom width of single three-dimensional toper nanometer tunic structure.
When the number of the silica-hafnium oxide composite layers is less than 10, the absorption rate at the atmospheric window is lowered, thereby lowering the cooling efficiency; when the quantity of silica-hafnia composite bed was greater than 20 layers, multilayer film structure thickness increased, lead to the loss increase to solar spectrum, and then made the device reduce to the reflectivity of solar spectrum wave band to reduce cooling efficiency, also can increase the cost of sample preparation simultaneously, consequently, compromise above-mentioned factor, the embodiment of the utility model provides an in the three-dimensional toper nanometer tunic structure, the quantity of silica-hafnia composite bed is 10 ~ 20 layers.
The utility model provides an above-mentioned three-dimensional toper nanometer tunic structure through the mode of radiation cooling, has realized the storage of no power consumption for medical supplies such as food, medicine.
To sum up, the utility model provides a three-dimensional toper nanometer tunic structure, be: a silicon dioxide-hafnium oxide composite layer and a silver layer, the silicon dioxide layer is providedPlacing the hafnium oxide layer above the substrate; the number of the silicon dioxide-hafnium dioxide composite layers is more than 10, and a plurality of the silicon dioxide-hafnium dioxide composite layers are arranged above the silver layer. In the technical scheme provided by the utility model, the three-dimensional conical nano-layer film structure is introduced, so that high-performance double-window atmospheric radiation can be realized, and finally, the high-efficiency passive radiation cooling capacity can be realized; through calculating, the utility model provides a technical scheme gained product, under the condition that sunshine penetrates directly, can reflect more than 95% solar spectrum to can realize the high infrared absorption of double-window. Can reach more than 156W/m in the daytime and at night respectively2And 199W/m2And when the ambient temperature is 300K, it is possible to reach an equilibrium temperature of 257.6K and 241.5K during the day and night, respectively. The utility model provides a pair of three-dimensional toper nanometer tunic structure has solved prior art, and there is the lower technical defect of net radiation cooling power in daytime refrigerated method.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A three-dimensional tapered nanolayer film structure, wherein the three-dimensional tapered nanolayer film structure is: the silicon dioxide-hafnium oxide composite layer is arranged above the hafnium oxide layer;
the number of the silicon dioxide-hafnium dioxide composite layers is more than 10, and a plurality of the silicon dioxide-hafnium dioxide composite layers are arranged above the silver layer.
2. The three-dimensional tapered nanolayer film structure of claim 1, wherein the silver layer has a thickness of from 120nm to 200 nm.
3. The three-dimensional tapered nanolayer film structure of claim 1, wherein the thickness of the silicon dioxide layer is from 1.8 μm to 2.0 μm.
4. The three-dimensional tapered nanolayer film structure of claim 1, wherein the hafnium oxide layer has a thickness of from 150nm to 200 nm.
5. The three-dimensional tapered nanolayer film structure of claim 1, wherein the bottom width of the three-dimensional tapered nanolayer film structure is from 10 μm to 11 μm and the top width of the three-dimensional tapered nanolayer film structure is from 1.5 μm to 2 μm.
6. The three-dimensional tapered nanolayer film structure of claim 1, wherein the three-dimensional tapered nanolayer film structure further comprises: the substrate layer is arranged on the lower portion of the silver layer and is a silicon wafer layer.
7. The three-dimensional tapered nanolayer film structure of claim 1, wherein the spacing between adjacent three-dimensional tapered nanolayer film structures is the same as the width of the base of a single three-dimensional tapered nanolayer film structure.
8. The three-dimensional tapered nanolayer film structure of claim 1, wherein the number of the silicon dioxide-hafnium dioxide composite layers is 10-20.
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| CN109943810A (en) * | 2019-03-06 | 2019-06-28 | 深圳大学 | A kind of three-dimensional taper nanometer film structure, preparation method and applications |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109943810A (en) * | 2019-03-06 | 2019-06-28 | 深圳大学 | A kind of three-dimensional taper nanometer film structure, preparation method and applications |
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