CN112198730B - Variable-color bionic leaf for hyperspectral stealth camouflage - Google Patents
Variable-color bionic leaf for hyperspectral stealth camouflage Download PDFInfo
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- CN112198730B CN112198730B CN202011017910.2A CN202011017910A CN112198730B CN 112198730 B CN112198730 B CN 112198730B CN 202011017910 A CN202011017910 A CN 202011017910A CN 112198730 B CN112198730 B CN 112198730B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/153—Constructional details
- G02F1/157—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
Abstract
A color-changeable bionic leaf for hyperspectral camouflage belongs to the technical field of hyperspectral camouflage. Including protective layer, bionical discoloration layer, electrode layer, electrolyte layer, ion storage layer and the protective layer that sets gradually, bionical discoloration layer includes: 42 to 62 weight percent of water, 20 to 40 weight percent of sol, 4 to 6 weight percent of lithium salt, 8 to 24 weight percent of yellow dye, 2 to 6 weight percent of blue electrochromic dye and 2 to 3 weight percent of infrared reflection increasing filler. The bionic tree leaves can be switched between green colors required by simulating fresh tree leaves and yellow colors required by simulating withered tree leaves according to requirements, have higher flexibility, and can meet the requirements of different vegetation environments.
Description
Technical Field
The invention belongs to the technical field of hyperspectral stealth camouflage, and particularly relates to a variable-color bionic leaf for hyperspectral stealth camouflage.
Background
With the continuous development of hyperspectral detection technology, the traditional camouflage means cannot provide sufficient protection for a unit. In the context of modern wars, the extensive use of high precision guided missiles and drones has been found to mean being destroyed. Although the existing widely-applied camouflage coating has a color similar to that of a natural vegetation environment, the existing widely-applied camouflage coating cannot be matched with a fine spectrum of leaves in hyperspectral remote sensing detection, so that the phenomenon of 'same color and different spectrums' is generated. The root cause of this phenomenon is that the camouflage coating does not have the organizational structure and composition characteristics of natural foliage, so that the fine spectrum it exhibits is vastly different from the true characteristics of foliage. In order to reverse the hyperspectral detection technology, the components and the structure of the camouflage coating are improved at home and abroad, and bionic leaves with the same reflection spectrum as vegetation are developed. However, the color of the bionic tree leaf is fixed and unchangeable, and cannot be changed along with the change of the surrounding environment in the process of ground unit movement, so that the target is exposed.
The hyperspectral detection technology is a precise optical detection technology, detection wave bands comprise all visible light wave bands (350-750 nm) and near infrared wave bands (750-2500 nm), and detection precision can reach 10 nm. Unlike conventional optical detection techniques that can only identify colors, hyperspectral detection techniques can identify differences between the same colors. For example, although the traditional camouflage colors are the same as vegetation in color, the fine reflection spectra of the traditional camouflage colors are obviously different (namely the same color and different spectra) in 350-2500 nm. Such differences can be identified by hyperspectral detection techniques, resulting in exposure of the unit to an enemy reconnaissance. Natural vegetation is the most common ground background, and the spectral features of vegetation are mainly from plant leaves. The fine reflectance spectrum of a plant leaf contains several features (as shown in figure 1): the first reflection peak (the withered leaves have no reflection peak) at 550nm has the intensity of 8-15%, and the reflection peak is from the color of vegetation; secondly, the intensity of the near-infrared reflection plateau in the range of 850-1150 nm is 50-60%, and the reflection plateau is generated by a unique pore structure in the plant leaves; and thirdly, the intensities of absorption peaks at 1400nm and 1800nm are respectively 15-25% and 5-10%, and the absorption peaks are absorption peaks generated by water in plant leaves. In order to counter the hyperspectral detection technology, a novel camouflage technology capable of fully simulating the fine spectrum of vegetation is urgently needed, and the novel camouflage technology must comprise three reflection characteristics of the plant leaves; meanwhile, the fresh leaves (green) and the withered leaves (yellow) can be timely changed to meet the requirement of blending into a constantly changing vegetation environment.
Disclosure of Invention
The invention aims to provide a bionic tree leaf with a hyperspectral camouflage function, wherein the color of the bionic tree leaf can be changed according to different applied voltages so as to meet the requirements of hyperspectral camouflage and a continuously changing vegetation environment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a color-changeable bionic leaf for hyperspectral camouflage comprises a protective layer, a bionic color-changing layer, an electrode layer, an electrolyte layer, an ion storage layer and a protective layer from bottom to top in sequence, as shown in figure 2; wherein, bionical discoloration layer is the main functional layer of this bionical leaf, can change the colour of self according to the impressed voltage of difference when realizing having the same meticulous reflectance spectrum with the vegetation, further realizes the simulation to different colour vegetation. Wherein, bionical discoloration layer includes: 42 to 62 weight percent of water, 20 to 40 weight percent of sol, 4 to 6 weight percent of lithium salt, 8 to 24 weight percent of yellow dye, 2 to 6 weight percent of blue electrochromic dye and 2 to 3 weight percent of infrared reflection increasing filler. Wherein the mass ratio of the yellow dye to the blue electrochromic dye is (2-4): 1.
further, the sol is polyvinyl alcohol or polymethyl methacrylate or the like; the lithium salt includes, but is not limited to, lithium chloride, lithium perchlorate, and the like.
Furthermore, the shape of the bionic leaf can be a triangle, a quadrangle, a circle, a polygon and other two-dimensional plane shapes with non-hollow interior, and the area is 10-50 cm2。
Further, the bionic color-changing layer is prepared by spin coating or blade coating the bionic color-changing hydrogel on the electrode layer.
Further, the formula of the bionic color-changing hydrogel is as follows: 64 to 84 weight percent of water, 10 to 20 weight percent of sol, 2 to 4 weight percent of lithium salt, 2 to 16 weight percent of yellow dye, 1 to 4 weight percent of blue electrochromic dye and 1 to 2 weight percent of infrared reflection-increasing filler. Wherein the mass ratio of the yellow dye to the blue electrochromic dye is (2-4): 1. the sol comprises polyvinyl alcohol, polymethyl methacrylate and the like; the lithium salt includes lithium chloride, lithium perchlorate and the like; yellow dyes include iron yellow, cobalt yellow, chrome yellow, etc.; the blue electrochromic dye is an electrochromic material which can be changed between blue and colorless, and comprises Prussian blue, tungsten trioxide, PEDOT, PSS and the like; the infrared reflection-increasing filler comprises silicon dioxide, titanium dioxide and the like.
Further, the preparation of the bionic color-changing layer by the spin coating method comprises two spin coating processes: the dosage of the first bionic color-changing hydrogel is 0.03-0.05 ml cm-2The spin coating speed is 1500-2500 rpm, the time is 45-60 s, and after the spin coating is finished, drying is carried out for 15-20 min at the temperature of 75-85 ℃; the dosage of the second bionic color-changing hydrogel is 0.01-0.02 ml cm-2The spin coating speed is 500-1000 rpm for 15-30 s,and drying the obtained product for 5-10 min at 50-60 ℃ after the spin coating is finished. When the bionic color-changing layer is prepared by a blade coating method, the using amount of the bionic color-changing hydrogel is 0.01-0.04 ml cm-2。
Further, the preparation process of the bionic color-changing hydrogel specifically comprises the following steps: firstly, adding sol into deionized water, stirring for 3-5 hours at 80-90 ℃ in an oil bath, taking out and standing after the reaction is finished so as to cool and defoam to obtain hydrogel; and then, under the condition of stirring, adding blue electrochromic dye, lithium salt, yellow dye and infrared reflection increasing filler into the hydrogel obtained in the previous step, and stirring for 72 hours to obtain the bionic color-changing hydrogel. The mass percent of the deionized water is 64-84 wt%, the mass percent of the sol is 10-20 wt%, the mass percent of the lithium salt is 2-4 wt%, the mass percent of the yellow dye is 2-16 wt%, the mass percent of the blue electrochromic dye is 1-4 wt%, and the mass percent of the infrared reflection-increasing filler is 1-2 wt%. The sol comprises polyvinyl alcohol, polymethyl methacrylate and the like; the lithium salt includes lithium chloride, lithium perchlorate and the like; yellow dyes include iron yellow, cobalt yellow, chrome yellow, etc.; the blue electrochromic dye is an electrochromic material which can be changed between blue and colorless, and comprises Prussian blue, tungsten trioxide, PEDOT, PSS and the like; the infrared reflection-increasing filler comprises silicon dioxide, titanium dioxide and the like.
Preferably, the electrode layer comprises a porous membrane and a conductive film formed on the porous membrane by adopting an electron beam evaporation method or a magnetron sputtering method, the electrode layer has the main functions of bearing the bionic color-changing layer and serving as a bridge for connecting an external circuit, and meanwhile, the porous structure of the porous membrane can ensure that the electrolyte is immersed into the bionic color-changing layer and the ion storage layer. The conductive film is made of gold, silver, platinum and the like, the thickness is 100-200 nm, and the sheet resistance is 50-100 omega sq-1(ii) a The porous membrane is made of nylon 66 and the like, the thickness of the porous membrane is 200 mu m, and the diameter of the porous membrane is 2-10 mu m.
Preferably, the electrolyte layer is prepared by coating the electrolyte hydrogel on the non-gold-plated surface of the electrode layer by scraping, and the scraping amount is 0.05-0.1 ml cm-2. Wherein the electrolyte hydrogel is 10 wt% >. E.C. in mass fraction20 wt% of potassium salt electrolyte hydrogel, wherein the potassium salt is one or more of potassium chloride, potassium nitrate, potassium sulfate and the like. The electrolyte can permeate into the bionic color-changing layer through the electrode layer, as shown in figure 2.
Preferably, the ion storage layer is prussian blue, zinc ferricyanide, molybdate ferricyanide and the like, and is prepared by an electrodeposition method or a spin coating method. The ion storage layer has the function of promoting the electrochromic reaction of the bionic color changing layer, and the hyperspectral camouflage function of the bionic leaves is not directly influenced.
Preferably, the protective layer is a polyethylene film. The thickness of the polyethylene film is 100 μm in order not to affect the optical properties of the biomimetic colour change layer. And (3) sequentially superposing all layers of the bionic leaves, and rolling under a hot press to finish the encapsulation of the bionic leaves.
According to the variable color bionic tree leaves for hyperspectral stealth camouflage, when coloring voltage of blue electrochromic dye is applied, the blue electrochromic dye in the bionic color changing layer is blue, the bionic color changing layer is mixed with blue and yellow according to a color mixing principle at the moment, namely, the bionic color changing layer is green, and the reflection spectrum of fresh (green) tree leaves can be simulated at the moment; when the fading voltage of the blue electrochromic dye is applied, the blue electrochromic dye in the bionic color-changing layer is colorless, the bionic color-changing layer is colorless and yellow in color mixing, namely yellow according to the color mixing principle, and the reflection spectrum of withered (yellow) leaves can be simulated at the moment.
Further, as shown in fig. 3, the principle of the bionic color-changing layer simulating the fine reflection spectrum of the vegetation specifically is as follows:
(1) aiming at the reflection peak of the green leaves at 550nm, the bionic leaves are realized by mixing the colors of blue electrochromic dye and yellow dye in the bionic color-changing layer. Preferably, in order to control the reflectivity of the bionic color-changing layer at 550nm to be 8-15%, the mass ratio of the blue electrochromic dye to the yellow dye is controlled to be 4-2. In addition, the fine reflection spectrum of the yellow tree leaf is obtained after the fading voltage of the blue electrochromic dye is applied to the bionic tree leaf.
(2) Aiming at the near-infrared reflection plateau of the plant leaves in the range of 850-1150 nm, the bionic leaves are realized by infrared reflection increasing fillers in a bionic color-changing layer. Preferably, in order to control the reflectivity of the bionic color-changing layer within the range of 850-1150 nm to be 50-60%, the mass fraction of the infrared reflection-increasing filler is 2-3 wt%.
(3) Aiming at the water absorption peaks of the plant leaves at 1400nm and 1800nm, the bionic leaves are realized by the water absorption effect of water and lithium salt in the bionic color-changing layer and water in the electrolyte layer. Wherein, a certain amount of moisture can be preserved to the gel network in the bionical discoloration layer, and water in the electrolyte layer can be passed through the electrode layer and is absorbed by bionical discoloration layer. Preferably, lithium salt with the mass fraction of 4 wt% -6 wt% is added into the bionic color-changing layer to improve the water absorption and water retention capacity of the bionic color-changing layer.
(4) The bionic leaves were simulated by coloring and discoloring blue electrochromic dyes in the bionic color-changing layer as shown in fig. 4 for the difference in reflectance spectra between fresh (green) leaves and withered (yellow) leaves. When the coloring voltage of the blue electrochromic dye is applied, the blue electrochromic dye in the bionic color-changing layer is blue, at the moment, according to the color mixing principle, the bionic color-changing layer is mixed with blue and yellow, namely green, and at the moment, the reflection spectrum of fresh (green) leaves can be simulated; when the fading voltage of the blue electrochromic dye is applied, the blue electrochromic dye in the bionic color-changing layer is colorless, the bionic color-changing layer is colorless and yellow in color mixing, namely yellow according to the color mixing principle, and the reflection spectrum of withered (yellow) leaves can be simulated at the moment.
Compared with the prior art, the invention has the beneficial effects that:
compared with the traditional camouflage color, the variable-color bionic leaves for hyperspectral stealth camouflage fully simulate the fine reflection spectrum of vegetation, and have the hyperspectral detectability which is not possessed by the traditional camouflage color;
compared with the hyperspectral camouflage color, the variable-color bionic leaves for hyperspectral stealth camouflage provided by the invention can be switched between green color required for simulating fresh leaves and yellow color required for simulating withered leaves according to requirements, have higher flexibility and can meet the requirements of different vegetation environments.
Drawings
FIG. 1 is a fine reflectance spectrum of fresh (green) leaves and withered (yellow leaves) leaves in a color-changeable bionic leaf for hyperspectral camouflage according to the invention;
FIG. 2 is a schematic structural diagram of a device for hyperspectral camouflage of variable-color bionic leaves according to the invention;
FIG. 3 is a mechanism of a bionic color-changing layer of a color-changeable bionic leaf for hyperspectral camouflage simulating a leaf fine reflection spectrum;
FIG. 4 is a color change principle of the variable color bionic leaves for hyperspectral camouflage provided by the invention.
Detailed Description
The technical scheme of the invention is detailed below by combining the accompanying drawings and the embodiment.
Example 1
A color-changeable bionic leaf for hyperspectral camouflage, which is prepared by the following steps:
step 1, preparing an electrode layer:
cutting nylon 66 into 5cm × 5cm, spreading in an electron beam evaporation vacuum cavity, and fixing four corners of the cavity on the inner wall of the cavity by using magnet. Closing the vacuum chamber door, sequentially starting the vacuum pumps at all stages until the air pressure in the chamber is reduced to 4 multiplied by 10-4And after Pa, starting an electron gun and bombarding the gold target material to start the evaporation of the conductive gold film. And after the evaporation is finished, sequentially closing each stage of vacuum pump, and taking out the single-sided gold-plated nylon 66 porous membrane after the air pressure in the vacuum chamber is restored to the atmospheric pressure to obtain the electrode layer.
Step 2, preparing the bionic color-changing layer:
2.1 preparation of Prussian blue powder
7.455g of potassium chloride is added into 100ml of deionized water, stirred, then added with 0.5ml of concentrated hydrochloric acid, and stirred continuously; then, 0.811g of ferric chloride and 2.112g of potassium ferrocyanide were added thereto, at which a large amount of blue precipitate was generated, and sufficiently stirred for 48 hours, to obtain a prussian blue suspension. Pouring the Prussian blue suspension into a centrifuge tube, centrifuging at 8000rpm for 10min, taking out, pouring out clear liquid, adding equivalent deionized water to fully clean the residual slurry in the centrifuge tube, and repeating the centrifuging and cleaning operation twice to obtain the Prussian blue slurry. And transferring the Prussian blue slurry into a culture dish, putting the culture dish into an oven for drying to obtain a Prussian blue block, and fully grinding the Prussian blue block in an agate mortar to obtain Prussian blue powder.
2.2 preparation of biomimetic allochroic hydrogel
Weighing 4g of PVA (polyvinyl alcohol) powder, adding the PVA powder into 25ml of deionized water, stirring and reacting for 4h at 85 ℃ in an oil bath, taking out the PVA powder after the reaction is finished, standing the PVA powder at room temperature so as to cool and defoam the PVA powder to obtain PVA hydrogel; then, placing the PVA hydrogel on a stirring table, continuously stirring, sequentially adding 0.5g of Prussian blue, 0.8g of lithium chloride, 2g of iron yellow and 0.4g of silicon dioxide, and stirring for 72 hours to obtain the bionic color-changing hydrogel.
2.3 preparation of the biomimetic color-changing layer
And (3) preparing the bionic color-changing layer by taking the electrode layer obtained in the step (1) as a substrate and the bionic color-changing hydrogel obtained in the step (2) as spin coating liquid. The preparation of the bionic color-changing layer by the spin-coating method comprises two spin-coating processes: the dosage of the first spin-coating bionic color-changing hydrogel is 0.03ml cm-2The rotating speed is 1500rpm, the time is 60s, and the mixture is dried for 20min at the temperature of 75 ℃ after the spin coating is finished; the dosage of the second spin-coating bionic color-changing hydrogel is 0.02ml cm-2The rotating speed is 500rpm, the time is 30s, and the coating is dried for 10min at 50 ℃ after the spin coating is finished.
Step 3, preparing an electrolyte layer:
weighing 2.5g of PVA (polyvinyl alcohol) powder, adding the PVA powder into 25ml of deionized water, stirring and reacting for 4 hours at 85 ℃ in an oil bath, taking out the PVA powder after the reaction is finished, and standing the PVA powder at room temperature so as to cool and defoam the PVA powder to obtain PVA hydrogel; then, adding 3g of potassium chloride into the PVA hydrogel, and uniformly stirring to obtain electrolyte hydrogel; and finally, coating the electrolyte hydrogel on the non-gold-plated surface of the electrode layer by blade coating to obtain the electrolyte layer.
Step 4, preparing an ion storage layer:
weighing 0.081g of trisAdding ferric chloride, 0.164g of potassium ferricyanide and 0.0925g of potassium chloride into 50ml of deionized water, and uniformly stirring to obtain Prussian blue electrodeposition liquid; then, the electrode layer obtained in step 1 was used as a working electrode, a platinum sheet as a counter electrode, and silver/silver chloride as a reference electrode at 50. mu.A cm-2Depositing for 300s under constant current to obtain the Prussian blue ion storage layer.
Step 5, bionic leaf packaging:
and (3) sequentially stacking the polyethylene film, the electrode layer in the step (1), the bionic color-changing layer in the step (2), the electrolyte layer in the step (3), the ion storage layer in the step (4) and the polyethylene film, and completing packaging with the aid of a hot press to obtain the color-changing bionic leaves.
Example 2
A color-changeable bionic leaf for hyperspectral camouflage, which is prepared by the following steps:
step 1, preparing an electrode layer:
cutting nylon 66 into 4cm × 8cm, spreading in an electron beam evaporation vacuum cavity, and fixing four corners of the cavity on the inner wall of the cavity by using magnet. Closing the vacuum chamber door, sequentially starting the vacuum pumps at all stages until the air pressure in the chamber is reduced to 4 multiplied by 10-4And after Pa, starting an electron gun and bombarding the gold target material to start the evaporation of the conductive gold film. And after the evaporation is finished, sequentially closing each stage of vacuum pump, and taking out the single-sided gold-plated nylon 66 porous membrane after the air pressure in the vacuum chamber is restored to the atmospheric pressure to obtain the electrode layer.
Step 2, preparing the bionic color-changing layer:
2.1 preparation of tungsten trioxide powder
Firstly, preparing a peroxytungstic acid solution. 3.2g of sodium tungstate was added to 30ml of deionized water and stirred well to obtain a clear solution. Then, 3mol L of a solvent was added dropwise thereto-1Hydrochloric acid solution until no more precipitate is formed. The precipitate was removed, washed, 5ml of 30% hydrogen peroxide solution was added, followed by 95ml of deionized water. The solution is fully stirred at the temperature of 60 ℃ to obtain the peroxytungstic acid solution. Taking 10ml of peroxytungstic acid solution, 3mol L-1Hydrochloric acid solution 3ml, deionized water20ml of glycerol, 25ml of glycerol and 0.15g of ammonium sulfate are put in a beaker and fully stirred to obtain clear and transparent hydrothermal precursor liquid. Then, 25ml of hydrothermal precursor solution is added into a 50ml hydrothermal kettle and placed in an oven to be hydrothermal for 2.5h at 120 ℃. And after the hydrothermal reaction is finished, taking out the hydrothermal kettle, collecting the powder generated inside, cleaning and drying to obtain the tungsten trioxide powder.
2.2 preparation of biomimetic allochroic hydrogel
Weighing 6g of PMMA (polymethyl methacrylate) powder, adding the PMMA powder into 25ml of deionized water, stirring and reacting for 5 hours at 85 ℃ in an oil bath, taking out the PMMA powder after the reaction is finished, and standing the PMMA powder at room temperature so as to cool and defoam the PMMA powder to obtain PMMA hydrogel; then, placing the PMMA hydrogel on a stirring table, continuously stirring, sequentially adding 0.4g of tungsten trioxide, 0.8g of lithium perchlorate, 1.5g of cobalt yellow and 0.6 g of titanium dioxide, and stirring for 72 hours to obtain the bionic color-changing hydrogel.
2.3 preparation of the biomimetic color-changing layer
And (3) preparing the bionic color-changing layer by taking the electrode layer obtained in the step (1) as a substrate and the bionic color-changing hydrogel obtained in the step (2) as a blade coating liquid. 1.2ml of bionic color-changing hydrogel is sucked by a dropper, and then the bionic color-changing hydrogel is dripped on one side of the electrode layer, and the bionic color-changing hydrogel is evenly coated on the other side by a scraper. Then, the film was naturally dried at room temperature.
Step 3, preparing an electrolyte layer:
weighing 3g of PMMA (polymethyl methacrylate) powder, adding the PMMA powder into 25ml of deionized water, stirring and reacting for 4 hours at 85 ℃ in an oil bath, taking out the PMMA powder after the reaction is finished, and standing the PMMA powder at room temperature so as to cool and defoam the PMMA powder to obtain PMMA hydrogel; then, adding 5g of potassium sulfate into the PMMA hydrogel, and uniformly stirring to obtain electrolyte hydrogel; and finally, coating the electrolyte hydrogel on the non-gold-plated surface of the electrode layer by blade coating to obtain the electrolyte layer.
Step 4, preparing an ion storage layer:
weighing 0.238g of potassium molybdate, 0.328g of potassium ferricyanide and 7.455g of potassium chloride, adding into 50ml of deionized water, and uniformly stirring to obtain molybdate ferricyanide electrodeposition solution; then, flexible ITO is used as a working electrode, a platinum sheet is used as a counter electrode, silver/silver chloride is used as a reference electrode, and the voltage window is kept between-0.1V and 0.8VIn the mouth, at 0.1V s-1And circulating for 80 circles at the sweeping speed to obtain the molybdate ferricyanide ion storage layer.
Step 5, bionic leaf packaging:
and (3) sequentially stacking the polyethylene film, the electrode layer in the step (1), the bionic color-changing layer in the step (2), the electrolyte layer in the step (3), the ion storage layer in the step (4) and the polyethylene film, and completing packaging with the aid of a hot press to obtain the color-changing bionic leaves.
Claims (8)
1. The utility model provides a bionical leaf of changeable colour for high spectrum stealth is disguised which characterized in that, includes protective layer, bionical discoloration layer, electrode layer, electrolyte layer, ion storage layer and the protective layer that sets gradually, wherein, bionical discoloration layer includes: 42 to 62 weight percent of water, 20 to 40 weight percent of sol, 4 to 6 weight percent of lithium salt, 8 to 24 weight percent of yellow dye, 2 to 6 weight percent of blue electrochromic dye and 2 to 3 weight percent of infrared reflection increasing filler; the mass ratio of the yellow dye to the blue electrochromic dye is (2-4): 1.
2. the variable color biomimetic foliage for hyperspectral camouflage according to claim 1, wherein the sol comprises polyvinyl alcohol or polymethylmethacrylate; the lithium salt includes lithium chloride, lithium perchlorate or lithium nitrate.
3. The variable color biomimetic foliage for hyperspectral camouflage according to claim 1, wherein the yellow dye is iron yellow, cobalt yellow or chrome yellow; the blue electrochromic dye is an electrochromic material which changes between blue and colorless, and comprises Prussian blue, tungsten trioxide or PEDOT, PSS; the infrared reflection increasing filler is silicon dioxide or titanium dioxide.
4. The color-changeable bionic leaf for hyperspectral camouflage according to claim 1, wherein the bionic color-changing layer is prepared by spin coating or blade coating a bionic color-changing hydrogel on the electrode layer.
5. The variable color bionic tree leaves for hyperspectral stealth camouflage according to claim 4, wherein the formula of the bionic color-changing hydrogel is as follows: 64 to 84 weight percent of water, 10 to 20 weight percent of sol, 2 to 4 weight percent of lithium salt, 2 to 16 weight percent of yellow dye, 1 to 4 weight percent of blue electrochromic dye and 1 to 2 weight percent of infrared reflection increasing filler.
6. The color-changeable bionic leaf for hyperspectral camouflage according to claim 1, wherein the electrode layer comprises a porous membrane and a conductive film formed on the porous membrane by adopting an electron beam evaporation method or a magnetron sputtering method, wherein the conductive film is gold, silver or platinum and has a thickness of 100-200 nm; the porous membrane is nylon 66, the thickness of the porous membrane is 200 mu m, and the diameter of the porous membrane is 2-10 mu m.
7. The color-changeable bionic leaf for hyperspectral camouflage according to claim 1, wherein the electrolyte layer is prepared by scraping electrolyte hydrogel on the non-gold-plated surface of the electrode layer, and the scraping amount is 0.05-0.1 ml cm-2(ii) a The electrolyte hydrogel is 10-20 wt% of potassium salt electrolyte hydrogel.
8. The color-changeable bionic leaf for hyperspectral camouflage according to claim 1, wherein the ion storage layer is Prussian blue, zinc ferricyanide or molybdate ferricyanide and is prepared by an electrodeposition method, a spin coating method or a blade coating method.
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| CN113311628A (en) * | 2021-05-18 | 2021-08-27 | 电子科技大学 | Self-repairing integrated electrochromic bionic leaf for intelligent stealth |
| CN113604090A (en) * | 2021-06-25 | 2021-11-05 | 苏州同构科技有限公司 | Green coating for simulating plant reflection curve and preparation method thereof |
| CN113527781A (en) * | 2021-07-19 | 2021-10-22 | 安徽财纳伽善科技有限公司 | Nano-scale plant fiber for simulating leaves and capable of simulating moisture |
| CN114485272A (en) * | 2022-03-16 | 2022-05-13 | 电子科技大学 | Hyperspectral stealth bionic material and application thereof |
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