CN114054112B - Micro-fluidic technology-based medium-adjustable wave-absorbing metamaterial and performance regulation and control device thereof - Google Patents
Micro-fluidic technology-based medium-adjustable wave-absorbing metamaterial and performance regulation and control device thereof Download PDFInfo
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Abstract
The invention relates to a medium adjustable wave-absorbing metamaterial based on a microfluidic technology and a performance regulating and controlling device thereof. The medium adjustable wave-absorbing metamaterial comprises: a total reflection layer; and at least one metamaterial layer containing micro-channels and arranged on the total reflection layer. The performance regulation and control device comprises a liquid medium pushing assembly, a liquid medium mixing assembly, a medium adjustable wave-absorbing metamaterial and a liquid medium recoverer which are sequentially communicated through a liquid conveying pipeline along the flow direction of a liquid medium, wherein the medium adjustable wave-absorbing metamaterial is used for realizing the wave-absorbing performance of the metamaterial from two aspects of materials and structures. By utilizing the method, the separation of the wave-absorbing metamaterial functional structure and the control assembly is realized, the wave-absorbing metamaterial structural part has smaller thickness, meanwhile, the wave-absorbing medium characteristics in the micro-channel can be accurately regulated and controlled in real time, and high-efficiency wave-absorbing performance is obtained.
Description
Technical Field
The disclosure relates to the technical field of micro-fluidic and wave-absorbing metamaterials, in particular to a medium-adjustable wave-absorbing metamaterial based on a micro-fluidic technology and a performance regulating and controlling device thereof.
Background
The microfluidic technology is also called lab-on-a-chip technology, the minimum size of the channel and the component can reach dozens of micrometers, and the micro-volume fluid can be flexibly controlled to flow in the channel or the component. The microfluidic technology is an important emerging means for realizing the design and preparation and performance regulation of novel functional materials with precisely controllable microstructures, and is expanding from the drug analysis and detection of a chemical platform to multiple fields.
The electromagnetic wave-absorbing metamaterial is composed of periodic repeating units, can effectively absorb and attenuate electromagnetic radiation, achieves the aim of eliminating electromagnetic radiation pollution, and is widely applied to various fields such as stealth technology, electromagnetic radiation pollution elimination, antennas and the like. However, most wave-absorbing metamaterials cannot regulate and control dielectric constant and magnetic permeability after being manufactured and molded, so that the application of the wave-absorbing metamaterials in the field is limited. The regulation and control of the electromagnetic parameters of the metamaterial are realized through a special mode, the adjustability of the performance of the wave-absorbing metamaterial is realized, and the application range of the wave-absorbing metamaterial is favorably expanded. At present, the regulation and control methods of the adjustable wave-absorbing metamaterial mainly comprise four methods of voltage, magnetic field, heat and machinery, and the metamaterial is designed by adding voltage, magnetic field, heat source, mechanical device and the like besides the functional structure with variable electromagnetic parameters, which directly results in the increase of the thickness and volume of the metamaterial. Therefore, the thickness of the wave-absorbing metamaterial is reduced as much as possible while the functional characteristics of the adjustable wave-absorbing metamaterial are realized, and the method has important significance for the practical application of the adjustable wave-absorbing metamaterial.
Through inquiry, the prior art which has higher relevance with the microfluidic technology and the adjustable wave-absorbing metamaterial and is disclosed at present comprises the following steps: firstly, a mechanically adjustable electromagnetic wave-absorbing metamaterial filled with water and used for adjusting and controlling the wave-absorbing performance of the metamaterial is realized in a mechanically adjustable mode; secondly, the medium-based broadband adjustable metamaterial wave absorber for regulating and controlling the dielectric constant by changing the water content in the sandy soil is difficult to realize accurate and real-time regulation and control of the wave absorption performance; thirdly, the adjustable-frequency intelligent wave-absorbing metamaterial changes the shape and the wave-absorbing performance of the structural unit of the microfluid metamaterial by sensing the shape change of the external environment temperature and belongs to a thermal control or temperature control mechanism; fourthly, designing a metamaterial structure convenient for packaging based on the microfluid metamaterial structure of the PDMS packaging technology, but not regulating and controlling the wave absorbing performance of the metamaterial; and fifthly, the tunable optical transparent broadband metamaterial wave absorber based on the water layer is characterized in that wave absorbing performance regulation is realized by regulating and controlling the thickness of the water layer.
At present, a wave-absorbing metamaterial and a performance regulating device for realizing adjustable liquid media by adopting a microfluidic technology are not disclosed.
Disclosure of Invention
In view of this, the main object of the present disclosure is to provide a medium adjustable wave-absorbing metamaterial based on a microfluidic technology and a performance regulating device thereof, so as to implement the liquid medium adjustable wave-absorbing metamaterial by using the microfluidic technology, accurately regulate and control the wave-absorbing medium characteristics in a micro channel, and obtain high-efficiency wave-absorbing performance.
In order to achieve the above object, according to one aspect of the present disclosure, a performance control apparatus for a medium adjustable wave-absorbing metamaterial based on a microfluidic technology is provided, the apparatus includes a liquid medium pushing component 2, a liquid medium mixing component 4, a medium adjustable wave-absorbing metamaterial 6 and a liquid medium recoverer 8, which are sequentially communicated with each other along a liquid medium flow direction by a liquid conveying pipeline, wherein:
the liquid medium pushing assembly 2 is used for pushing a plurality of liquid media with different dielectric constants to the liquid medium mixing assembly 4 through a liquid conveying pipeline;
the liquid medium mixing component 4 is used for mixing a plurality of liquid media with different dielectric constants and sending the mixed liquid media into the medium adjustable wave-absorbing metamaterial 6 through a liquid conveying pipeline;
the medium adjustable wave-absorbing metamaterial 6 is used for realizing the wave-absorbing performance of the metamaterial from two aspects of materials and structures;
and the liquid medium recoverer 8 is used for collecting and recycling the redundant solution discharged from the medium adjustable wave-absorbing metamaterial 6.
In the above scheme, the liquid medium pushing assembly 2 is further connected with a pressure control assembly 1, and is configured to control pushing pressures of a plurality of liquid media with different dielectric constants in the liquid medium pushing assembly 2 in a pneumatic pressure control mode or an electric pressure control mode.
In the scheme, the pneumatic pressure control mode realizes pressure regulation by combining an air pump pressure supply module, an air valve pressure regulation module and a program control module, and regulates and controls the pushing speed of the liquid medium by the air pressure; the electric pressure control mode drives a lead screw to operate through a motor, the lead screw is connected with a liquid medium pushing rod, the rotating speed of the motor is controlled by a program, and the pushing speed of the liquid medium is further controlled.
In the above scheme, the liquid medium pushing assembly 2 pushes a plurality of liquid media with different dielectric constants to the liquid medium mixing assembly 4 through a liquid conveying pipeline in the pneumatic pressure control mode or the electric pressure control mode, wherein: in the pneumatic pressure control mode, the liquid medium pushing assembly 2 adopts a plurality of dispensing syringes, liquid media are filled in the syringes, and pistons in the dispensing syringes are pushed by air pressure to push the liquid media; in the electric pressure control mode, the liquid medium pushing assembly 2 adopts a plurality of injectors, the injectors at least comprise piston rods, pistons and needle cylinders, and the lead screw pushes the piston rods and the pistons through the conversion assembly, so that the pushing of the liquid medium is realized.
In the above scheme, the dispensing needle cylinder and the injector are both made of polypropylene or stainless steel; the liquid medium is at least one of water, alcohols, esters and ketones; the liquid medium is added with intrinsic conductive polymer, carbon nano tubes, graphene oxide or conductive carbon black to improve the dielectric constant and dielectric loss tangent of the liquid medium, or added with materials which are easily dissolved in corresponding solvents to improve or reduce the dielectric constant of the liquid medium.
In the above scheme, the alcohol comprises at least one of methanol, ethanol and isopropanol; the esters comprise at least one of ethyl acetate and butyl acetate; the ketones include at least one of acetone and butanone; the corresponding solvent is nontoxic, slightly toxic or low-toxic solvent, and at least comprises water and ethanol.
In the above scheme, the number of dispensing syringes or injectors in the liquid medium pushing assembly 2 is at least two; the liquid media with different dielectric constants filled in different dispensing syringes or injectors in the liquid medium pushing assembly 2 meet the condition of mixing and dissolving.
In the above solution, the liquid medium mixing component 4 is a liquid mixing tube having a tubular structure with a certain diameter, and the liquid mixing tube includes a plurality of layers of spiral fan-shaped baffles arranged along the axial direction of the tube.
In the above scheme, the liquid medium is pushed by the liquid medium pushing component 2 and enters the liquid medium mixing component 4 through a liquid conveying pipeline, the liquid medium is mixed once every time the liquid medium flows through a layer of spiral baffle inside the liquid medium mixing component 4, the other end of the liquid medium mixing component 4 reaches a degree of complete mixing, and the mixed liquid medium enters the medium adjustable wave-absorbing metamaterial 6 through the liquid conveying pipeline.
In the above scheme, the medium-adjustable wave-absorbing metamaterial 6 includes: a total reflection layer; and at least one metamaterial layer containing micro-channels and arranged on the total reflection layer.
In the above scheme, the total reflection layer is made of a metal material or a non-metal material with high reflection performance. Wherein the metal material at least comprises a copper foil and an aluminum foil; the non-metallic material comprises at least one of a carbon fiber surfacing mat, a continuous carbon fiber composite material, a graphite film and a carbon nanotube film.
In the above scheme, the at least one metamaterial layer containing the micro flow channel is made of at least one of polymethyl methacrylate, silicone rubber, epoxy resin, phenolic resin and light-cured resin.
In the scheme, the micro-channel adopts a design of repeated reciprocating and longitudinal and transverse overlapping, and comprises at least one of a spiral line type micro-channel, an omega type micro-channel or an I-shaped micro-channel. Wherein the micro-channels in the metamaterial layers are of the same or different structures, and the micro-channels in the metamaterial layers are communicated with each other.
In the above scheme, the total reflection layer and the metamaterial layer are bonded by resin, and the resin includes at least one of epoxy resin, phenolic resin, light-cured resin and polyacrylate.
In the scheme, resin containing high-conductivity filler is adopted between the total reflection layer and the metamaterial layer. The resin containing the high-conductivity filler is conductive silver adhesive, and after the conductive silver adhesive is cured, the high-efficiency bonding of the total reflection layer and the metamaterial layer can be realized, and the high-efficiency reflection of electromagnetic waves can also be realized.
In the above scheme, the liquid medium recoverer 8 is connected to the medium adjustable wave-absorbing metamaterial 6 through a liquid conveying pipeline, collects the excess solution discharged from the medium adjustable wave-absorbing metamaterial 6, separates the collected excess solution, and recycles the solution after recovery. Wherein the separation is at least one of extraction and distillation.
In order to achieve the above object, according to another aspect of the present disclosure, there is provided a dielectric tunable wave-absorbing metamaterial based on a microfluidic technology, including: a total reflection layer; and at least one metamaterial layer containing micro-channels and arranged on the total reflection layer.
In the above scheme, the total reflection layer is made of a metal material or a non-metal material with high reflection performance. Wherein the metal material at least comprises a copper foil and an aluminum foil; the non-metallic material comprises at least one of a carbon fiber surfacing mat, a continuous carbon fiber composite material, a graphite film and a carbon nanotube film.
In the above scheme, the at least one metamaterial layer containing the micro flow channel is made of at least one of polymethyl methacrylate, silicone rubber, epoxy resin, phenolic resin and light-cured resin.
In the scheme, the micro-channel adopts a design of repeated reciprocating and longitudinal and transverse overlapping, and comprises at least one of a spiral line type micro-channel, an omega type micro-channel or an I-shaped micro-channel. The micro-channels in the metamaterial layers are of the same or different structures, and the micro-channels in the metamaterial layers are communicated with one another.
In the above scheme, the total reflection layer and the metamaterial layer are bonded by resin, and the resin includes at least one of epoxy resin, phenolic resin, light-cured resin and polyacrylate.
In the scheme, resin containing high-conductivity filler is adopted between the total reflection layer and the metamaterial layer. The resin containing the high-conductivity filler is conductive silver adhesive, and after the conductive silver adhesive is cured, the high-efficiency bonding of the total reflection layer and the metamaterial layer can be realized, and the high-efficiency reflection of electromagnetic waves can also be realized.
According to the technical scheme, the medium adjustable wave-absorbing metamaterial based on the microfluidic technology and the performance regulating and controlling device thereof have the following beneficial effects:
1. the adjustable microwave absorbing metamaterial based on the microfluidic technology and the performance regulating device thereof are designed from two aspects of materials and structures, so that the functional module of the microwave absorbing metamaterial is separated from the microwave absorbing performance regulating module, the overall thickness of the metamaterial is effectively reduced, the structural part of the microwave absorbing metamaterial has smaller thickness, and meanwhile, the characteristic of the microwave absorbing medium in a micro-channel can be accurately regulated and controlled in real time by adopting the design scheme of adjustable liquid medium, and high-efficiency microwave absorbing performance is obtained.
2. According to the medium adjustable wave-absorbing metamaterial based on the microfluidic technology and the performance regulating device thereof, the medium adjustable wave-absorbing metamaterial structure is designed and prepared as an independent module, and the module can be conveniently replaced in actual use so as to meet different use conditions.
3. The medium-adjustable wave-absorbing metamaterial based on the microfluidic technology and the performance regulating and controlling device thereof adopt a pneumatic control scheme and an electric control scheme, and can realize accurate regulation and control of the wave-absorbing performance of the metamaterial.
4. The medium adjustable wave-absorbing metamaterial based on the microfluidic technology and the performance regulating device thereof can be used for designing one-layer or multi-layer structures according to actual use requirements, have high designability and can meet various wave-absorbing requirements. In the design of a multilayer structure, the filling medium types of different wave-absorbing metamaterial layers and whether liquid media are filled can be regulated and controlled according to wave-absorbing performance requirements, and the cooperative regulation and control of the plurality of layers of different types of metamaterials are realized.
5. The micro-channel design scheme is not limited to a certain forming technology, and can be realized by various forming technologies such as photocuring 3D printing forming, numerical control cutting forming, laser cutting forming, photoetching forming and the like.
6. According to the medium adjustable wave-absorbing metamaterial based on the micro-fluidic technology and the performance regulating and controlling device thereof, the medium adjustable wave-absorbing metamaterial can be prepared by flexible resin, has good shaping performance and sticking performance, and meets the use requirements of different modeling structures.
7. According to the micro-fluidic technology-based medium adjustable wave-absorbing metamaterial and the performance regulating and controlling device thereof, the obtained medium adjustable wave-absorbing metamaterial can be applied to a plurality of fields such as square cabins, microwave dark chambers and stealth equipment, and has a good application prospect.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments of the present disclosure with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a performance regulation and control device of a medium-adjustable wave-absorbing metamaterial based on a microfluidic technology according to an embodiment of the disclosure.
Fig. 2 is a schematic diagram of a unit structure design of a medium-tunable wave-absorbing metamaterial according to an embodiment of the disclosure.
FIG. 3 is a schematic diagram of a multilayer medium adjustable wave-absorbing metamaterial according to an embodiment of the disclosure.
Fig. 4 shows microwave absorption rate test results of intrinsic conductive polymer solutions (Pedotpss), pure Water (Water), and Ethanol (Ethanol) in different mass ratios in the X band according to an embodiment of the disclosure, including: pedotpss: Water (P: W) ═ 1: 0, 1: 1, 1: 3; ethanol: Water (E: W) ═ 1: 4, 1: 10, and the microwave absorptance of pure Water W and unfilled liquid medium samples.
FIG. 5 shows the spacing d between adjacent microchannels according to an embodiment of the disclosure 2 The microwave absorptance test results of the samples of 0.3mm, 0.5mm, 0.75mm, 1.0mm, 1.5mm, and 1.75mm in the X band, respectively.
Reference numerals:
1 pressure control Assembly
2 liquid medium pushing assembly
3 first liquid conveying pipeline
4 liquid medium mixing assembly
5 second liquid conveying pipeline
6-medium adjustable wave-absorbing metamaterial
7 third liquid conveying pipeline
8, a liquid medium recoverer.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
And the shapes and sizes of the respective components in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The wave-absorbing characteristics and structural parameters of the material can directly influence the performance of the wave-absorbing metamaterial, and the medium adjustable wave-absorbing metamaterial and the performance regulating and controlling device thereof based on the microfluidic technology are designed from two aspects of the material and the structure respectively according to the influence mechanism of the dielectric constant on the wave-absorbing performance. From the aspect of materials, the dielectric property of the mixed solution is regulated and controlled by adopting a real-time mixing method of solutions with different conductivities, the exchange of liquid media in a micro-flow channel is realized by a micro-fluidic technology, and the regulation and control of the wave absorption performance are finally realized. The structure of the micro-channel which is repeatedly reciprocated and overlapped vertically and horizontally is designed, a specially designed wave absorbing structure is constructed by designing the parameters of the shape, distribution, size and the like of the micro-channel, and the regulation and control of the wave absorbing performance of the metamaterial are realized by changing corresponding structural parameters, so that the separation of the wave absorbing metamaterial functional module and the wave absorbing performance regulation and control module is realized, the wave absorbing metamaterial structural part has smaller thickness, meanwhile, the wave absorbing medium characteristics in the micro-channel can be accurately regulated and controlled in real time, and high-efficiency wave absorbing performance is obtained.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a performance regulating device of a medium adjustable wave-absorbing metamaterial based on a microfluidic technology according to an embodiment of the present disclosure, and the device includes a liquid medium pushing component 2, a liquid medium mixing component 4, a medium adjustable wave-absorbing metamaterial 6, and a liquid medium recoverer 8, which are sequentially communicated with each other along a liquid medium flow direction by a liquid conveying pipeline. The liquid medium pushing assembly 2 is used for pushing a plurality of liquid media with different dielectric constants to the liquid medium mixing assembly 4 through a liquid conveying pipeline; the liquid medium mixing component 4 is used for mixing a plurality of liquid media with different dielectric constants and sending the mixed liquid media into the medium adjustable wave-absorbing metamaterial 6 through a liquid conveying pipeline; the medium adjustable wave-absorbing metamaterial 6 is used for realizing the wave-absorbing performance of the metamaterial from two aspects of materials and structures; and the liquid medium recoverer 8 is used for collecting and recycling the redundant solution discharged from the medium adjustable wave-absorbing metamaterial 6.
Referring to fig. 1, the liquid medium pushing assembly 2 is further connected to a pressure control assembly 1, which is used for controlling pushing pressures of a plurality of liquid media with different dielectric constants in the liquid medium pushing assembly 2 in a pneumatic pressure control mode or an electric pressure control mode. The pneumatic pressure control mode realizes pressure regulation by combining an air pump pressure supply module, an air valve pressure regulation module and a program control module, and regulates the pushing speed of the liquid medium by the air pressure; the electric pressure control mode drives a lead screw to operate through a motor, the lead screw is connected with a liquid medium pushing rod, the rotating speed of the motor is controlled by a program, and the pushing speed of the liquid medium is further controlled.
In the disclosed embodiment, the liquid medium pushing assembly 2 pushes a plurality of liquid media with different dielectric constants to the liquid medium mixing assembly 4 through the first liquid conveying pipeline 3 in the pneumatic pressure control mode or the electric pressure control mode, wherein: in the pneumatic pressure control mode, the liquid medium pushing assembly 2 adopts a plurality of dispensing syringes, liquid media are filled in the syringes, and pistons in the dispensing syringes are pushed by air pressure to push the liquid media; in the electric pressure control mode, the liquid medium pushing assembly 2 adopts a plurality of injectors, the injectors at least comprise piston rods, pistons and syringes, and the screw rod pushes the piston rods and the pistons through the conversion assembly, so that the pushing of the liquid medium is realized.
In the embodiment of the present disclosure, the dispensing syringe and the injector are made of polypropylene or stainless steel, and other materials may be selected according to the special requirement of the liquid medium. The liquid medium is water, alcohols (methanol, ethanol, isopropanol and the like), esters (ethyl acetate, butyl acetate and the like), ketones (acetone, butanone and the like) and other organic and inorganic liquids, the intrinsic conductive polymer, the carbon nano tubes, the graphene oxide, the conductive carbon black and other conductive fillers can be added into the liquid medium to improve the dielectric constant and the dielectric loss tangent of the liquid, and other materials which can be easily dissolved in corresponding solvents can also be added to improve or reduce the dielectric constant; the selected corresponding solvent can be nontoxic, slightly toxic or low-toxic solvent such as water, ethanol, etc.
In the embodiment of the present disclosure, the number of dispensing syringes or syringes in the liquid medium pushing assembly 2 is at least two; the liquid media with different dielectric constants filled in different dispensing syringes or injectors in the liquid medium pushing assembly 2 meet the condition of mixing and dissolving.
In the embodiment of the present disclosure, the liquid medium mixing component 4 is a liquid mixing tube having a tubular structure with a certain diameter, and the inside of the liquid mixing tube includes a plurality of layers of spiral fan-shaped structure baffles arranged along the axial direction of the tube. The liquid medium is pushed by the liquid medium pushing component 2 and enters the liquid medium mixing component 4 through the first liquid conveying pipeline 3, the liquid medium is mixed once when flowing through one layer of spiral baffle in the liquid medium mixing component 4, the other end of the liquid medium mixing component 4 is completely mixed, and the mixed liquid medium enters the medium adjustable wave-absorbing metamaterial 6 through the second liquid conveying pipeline 5.
In the embodiment of the present disclosure, the medium-adjustable wave-absorbing metamaterial 6 includes: a total reflection layer; and at least one metamaterial layer containing micro-channels and arranged on the total reflection layer. The total reflection layer can be made of metal materials such as copper foil and aluminum foil, and can also be made of non-metal materials with high reflection performance such as carbon fiber surface felts, continuous carbon fiber composite materials, graphite films and carbon nanotube films. The at least one metamaterial layer containing the micro-channels is made of at least one of polymethyl methacrylate, silicon rubber, epoxy resin, phenolic resin and light-cured resin, and specific material selection needs to be comprehensively considered in combination with a preparation method of the metamaterial layer.
In the disclosed embodiment, the micro flow channel adopts a design of multiple reciprocating and longitudinal and transverse overlapping, and comprises at least one of a spiral micro flow channel, an omega-shaped micro flow channel or an I-shaped micro flow channel. The micro-channels in the metamaterial layers are of the same or different structures, and the micro-channels in the metamaterial layers are communicated with each other.
In the embodiment of the disclosure, the total reflection layer and the metamaterial layer are bonded by using resin, and the resin includes at least one of epoxy resin, phenolic resin, light-cured resin and polyacrylate. The resin containing the high-conductivity filler is adopted between the total reflection layer and the metamaterial layer, the resin containing the high-conductivity filler is conductive silver adhesive, and after the conductive silver adhesive is solidified, the total reflection layer can be efficiently bonded with the metamaterial layer, and the electromagnetic waves can be efficiently reflected.
In the embodiment of the present disclosure, the liquid medium recoverer 8 is connected to the medium-adjustable wave-absorbing metamaterial 6 through a third liquid conveying pipeline 7, collects excess solution discharged from the medium-adjustable wave-absorbing metamaterial 6, and separates the collected excess solution in various manners such as extraction and distillation according to characteristics of different solutions, and recycles the solution.
Based on the disclosure shown in figure 1The structure schematic diagram of the performance regulating device of the medium adjustable wave-absorbing metamaterial based on the microfluidic technology is shown in the embodiment, and fig. 2 is a schematic diagram of a unit structure design of the medium adjustable wave-absorbing metamaterial according to the embodiment of the disclosure. In FIG. 2, the thickness of the medium adjustable wave-absorbing metamaterial 6 is t, the side length of the section of the micro channel is d 1 Square of (2), the distance between adjacent microchannels is d 2 . The micro-channel is designed into two layers of Layer A/B, and the layers of Layer A and Layer B are arranged vertically. The liquid medium flows in from the inlet 1, flows through the whole unit structure and then flows out from the outlet 2. For convenience of illustration, the inlet and outlet shown in fig. 2 is on the right side of the schematic diagram of the sample, and the actual design is designed according to the distribution of the micro flow channels. The design of a specific wave absorbing structure is realized by designing the parameters such as the shape, the distribution, the size and the like of the micro flow channel, and the regulation and control of the wave absorbing performance of the metamaterial are realized by regulating and controlling corresponding structural parameters.
In the embodiment of the disclosure, reference numeral 6 in fig. 1 shows a macroscopic schematic view of a distribution form of micro channels in a medium-adjustable wave-absorbing metamaterial according to the embodiment of the disclosure, and fig. 2 shows that a chip unit containing longitudinally and transversely overlapped micro channels according to the embodiment of the disclosure is defined as a layer of wave-absorbing metamaterial structure. The design of the micro flow channel in FIG. 2 is characterized by multiple reciprocations and overlapping in length and breadth, and the schematic view of the structure of the micro unit is shown in FIG. 2. Regarding the shape and distribution of the micro flow channel, the design scheme of the micro flow channel is not limited to the one drawn in the schematic diagram, and other various design schemes, such as spiral micro flow channel, omega micro flow channel, i-shaped micro flow channel, etc. may be adopted.
In fig. 2, the metamaterial layer containing the micro flow channel may be made of materials such as polymethyl methacrylate, silicone rubber, epoxy resin, phenolic resin, and photo-curing resin, and specific material selection needs to be comprehensively considered in combination with a preparation method of the metamaterial layer.
When the medium adjustable wave-absorbing metamaterial is designed, the metamaterial can be designed into one layer or a plurality of layers of structures according to actual needs, fig. 2 shows that a chip unit containing longitudinal and transverse overlapped micro channels is defined as a layer of wave-absorbing metamaterial structure according to the embodiment of the disclosure, and fig. 3 shows a schematic diagram of the multi-layer medium adjustable wave-absorbing metamaterial according to the embodiment of the disclosure. In FIG. 3, 9-1 represents a first layer of wave-absorbing metamaterial structure, 9-2 represents a second layer of wave-absorbing metamaterial structure, 9-n represents an nth layer of wave-absorbing metamaterial structure, and 10 represents a total reflection layer. For the different wave-absorbing metamaterial layers of 9-1, 9-2, … … and 9-n, different design schemes can be selected for micro channels of different layers so as to achieve the design target of the actual wave-absorbing metamaterial. Moreover, the filling medium types of different wave-absorbing metamaterial layers and whether liquid media are filled can be regulated and controlled in the multilayer structure design according to actual use requirements, and the wave-absorbing performance regulation of the multiple layers of different types of metamaterials can be realized through comprehensive regulation and control.
The micro-fluidic technology-based medium adjustable wave-absorbing metamaterial and the performance regulating device thereof according to the embodiment of the disclosure are explained in detail above, and the preparation method of the medium adjustable wave-absorbing metamaterial 6 can adopt various molding technologies such as photocuring 3D printing molding, numerical control cutting molding, laser cutting molding, photoetching molding and the like.
The 3D printing and forming technology is the most direct and convenient forming technology among the technologies, firstly, slicing software is adopted to slice a designed three-dimensional drawing model, then, a photocuring 3D printer meeting the printing precision and size requirements is adopted to print, and cleaning and post-curing treatment are carried out after a sample is printed, so that the three-dimensional drawing model can be used.
The numerical control cutting forming technology mainly adopts the numerical control cutting technology to cut micro channels on plastic sheets with certain thickness to obtain sheets with micro-flow channel structures, then the sheets with certain thickness are pasted on the upper and lower surfaces of the sheets to carry out channel sealing treatment, and proper adhesive is selected to realize pasting of multiple layers of sheets, so that the final medium adjustable wave-absorbing metamaterial structure can be obtained.
Similarly, the thin sheet containing the micro-flow channel structure is obtained by adopting laser cutting forming and photoetching forming technologies, and the subsequent pasting processing process is the same as the post-processing process of the numerical control cutting forming technology.
Example 1
In this example, the thickness t of the printed sample was 2.4mm, and the cross-sectional shape of the micro flow channel was square，d 1 0.6mm, and the distance d between adjacent microchannels 2 The thickness of the micro-fluidic chip is 1.0mm, and the micro-fluidic chip is prepared by adopting a photocuring 3D printing technology.
Three different solutions were selected for this example: the conductive polymer comprises Pedotpss intrinsic conductive polymer solution, pure water and ethanol. Adopt waveguide method test sample's absorbing performance, obtained intrinsic conductive polymer solution (Pedotpss), pure Water (Water), Ethanol (Ethanol) of different mass proportions microwave Absorption rate (Absorption) test result at the X wave band, included: pedotpss: Water (P: W) ═ 1: 0, 1: 1, 1: 3; ethanol: Water (E: W) ═ 1: 4, 1: 10, and the microwave absorptance of pure Water W and unfilled liquid medium samples.
As shown in fig. 4, fig. 4 shows the microwave absorption rate test results of intrinsic conductive polymer solutions (Pedotpss), pure Water (Water), and Ethanol (Ethanol) with different mass ratios in the X band according to the embodiment of the disclosure, which includes: pedotpss: Water (P: W) ═ 1: 0, 1: 1, 1: 3; ethanol: Water (E: W) ═ 1: 4, 1: 10, and the microwave absorptance of pure Water W and unfilled liquid medium samples. As can be seen from fig. 4, the absorption rate of the chip without the injected aqueous solution to the electromagnetic wave of the X-band is less than 10%. After the water solution is injected into the chip, the micro-fluidic chip obtains excellent wave-absorbing performance, and the high-efficiency wave-absorbing performance with the microwave absorption rate of more than 99 percent in the X wave band is obtained along with the change of the mass fraction and the proportion of the solution.
The embodiment shows that the purpose of regulating the wave absorption performance of the medium adjustable wave-absorbing metamaterial can be realized by regulating the type of the liquid medium.
Example 2
The thickness t of a printed sample in the embodiment is 2.4 mm; the cross section of the micro flow channel is square, d 1 0.6mm, and the distance d between adjacent microchannels 2 0.3mm, 0.5mm, 0.75mm, 1.0mm, 1.5mm, and 1.75mm, respectively. The micro-fluidic chip is prepared by adopting a photocuring 3D printing technology. Pure water was injected as a microwave loss medium into all samples of this example. The wave-absorbing performance of the sample is tested by the waveguide method, the experimental result is shown in figure 5, and figure 5 shows the distance d between adjacent microchannels according to the embodiment of the disclosure 2 Respectively 0.3mm, 0.5mm, 0.75mm, 1.0mm, 1 mmResults of microwave absorptance test in the X band for samples of 5mm, and 1.75 mm. The result shows that the movement of the microwave absorption peak value of the microfluidic chip in the whole X wave band can be realized by regulating and controlling the distance between adjacent micro channels, and the high-efficiency wave absorption performance of the microwave absorption rate of more than 99 percent in the whole wave band range can be realized.
The embodiment shows that the aim of regulating and controlling the wave absorbing performance of the medium adjustable wave absorbing metamaterial can be achieved by changing the structural parameters of the micro-channel.
The present disclosure has been described in detail so far with reference to the accompanying drawings. From the above description, one skilled in the art should clearly recognize the present disclosure.
Implementations not shown or described in the drawings or in the specification are all forms known to those of ordinary skill in the art and are not described in detail. In addition, the above definitions of the respective elements are not limited to the specific structures, shapes or modes mentioned in the embodiments, and those skilled in the art may easily modify or replace them.
Of course, the present disclosure may also include other parts according to actual needs, and since the parts are not related to the innovation of the present disclosure, the details are not described herein.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
Further, in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Features in various embodiments illustrated in the description may be freely combined to form a new scheme without conflict, and in addition, each claim may be taken alone as an embodiment or the features in various claims may be combined to form a new embodiment. Further, elements or implementations not shown or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, although examples may be provided herein of parameters including particular values, it should be appreciated that the parameters need not be exactly equal to the respective values, but may approximate the respective values within acceptable error margins or design constraints.
Unless a technical obstacle or contradiction exists, the above-described various embodiments of the present disclosure may be freely combined to form further embodiments, which are all within the scope of protection of the present disclosure.
While the present disclosure has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of the preferred embodiments of the disclosure, and should not be construed as limiting the disclosure. The dimensional proportions in the drawings are merely illustrative and are not to be construed as limiting the disclosure.
Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (19)
1. The utility model provides a device is regulated and control to adjustable ripples metamaterial of medium based on micro-fluidic technique which characterized in that, the device includes liquid medium propelling movement subassembly (2), liquid medium hybrid module (4), adjustable ripples metamaterial of inhaling of medium (6) and liquid medium recoverer (8) that communicate in proper order by liquid conveying pipeline along the liquid medium flow direction, wherein:
the liquid medium pushing assembly (2) is used for pushing a plurality of liquid media with different dielectric constants to the liquid medium mixing assembly (4) through a liquid conveying pipeline;
the liquid medium mixing assembly (4) is used for mixing a plurality of liquid media with different dielectric constants and sending the mixed liquid media into the medium adjustable wave-absorbing metamaterial (6) through a liquid conveying pipeline;
the medium adjustable wave-absorbing metamaterial (6) is used for realizing the wave-absorbing performance of the metamaterial from two aspects of materials and structures;
the liquid medium recoverer (8) is used for collecting and recycling redundant solution discharged from the medium adjustable wave-absorbing metamaterial (6);
wherein, the liquid medium adopts at least one of water, alcohols, esters and ketones;
the medium adjustable wave-absorbing metamaterial (6) comprises: a total reflection layer; and at least one metamaterial layer containing a micro-channel and arranged on the total reflection layer.
2. The device for regulating and controlling the performance of the medium-adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 1, wherein the liquid medium pushing assembly (2) is further connected with a pressure control assembly (1) for controlling the pushing pressure of a plurality of liquid media with different dielectric constants in the liquid medium pushing assembly (2) in a pneumatic pressure control mode or an electric pressure control mode.
3. The device for regulating and controlling the performance of the medium adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 2,
the pneumatic pressure control mode realizes pressure regulation by combining an air pump pressure supply module, an air valve pressure regulation module and a program control module, and regulates the pushing speed of the liquid medium by the air pressure;
the electric pressure control mode drives a lead screw to operate through a motor, the lead screw is connected with a liquid medium pushing rod, the rotating speed of the motor is controlled by a program, and the pushing speed of the liquid medium is further controlled.
4. The device for regulating and controlling the performance of the medium-adjustable wave-absorbing metamaterial according to the claim 3, wherein the liquid medium pushing assembly (2) pushes a plurality of liquid media with different dielectric constants to the liquid medium mixing assembly (4) through a liquid conveying pipeline in the pneumatic pressure control mode or the electric pressure control mode, wherein:
in the pneumatic pressure control mode, the liquid medium pushing assembly (2) adopts a plurality of dispensing syringes, liquid media are filled in the syringes, and pistons in the dispensing syringes are pushed by air pressure to push the liquid media;
under the electric pressure control mode, the liquid medium pushing assembly (2) adopts a plurality of injectors, each injector at least comprises a piston rod, a piston and a needle cylinder, and the lead screw pushes the piston rod and the piston through the conversion assembly, so that the pushing of the liquid medium is realized.
5. The device for regulating and controlling the performance of the medium adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 4,
the dispensing needle cylinder and the injector are both made of polypropylene or stainless steel;
the liquid medium is added with intrinsic conductive polymer, carbon nano tubes, graphene oxide or conductive carbon black to improve the dielectric constant and dielectric loss tangent of the liquid medium, or is added with a material which is easily dissolved in a corresponding solvent to improve or reduce the dielectric constant of the liquid medium.
6. The device for regulating and controlling the performance of the medium adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 4,
the number of dispensing syringes or injectors in the liquid medium pushing assembly (2) is at least two;
and a plurality of liquid media with different dielectric constants filled in different dispensing syringes or injectors in the liquid medium pushing assembly (2) meet the condition of mixing and dissolving.
7. The device for regulating and controlling the performance of the dielectric adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 5,
the alcohol comprises at least one of methanol, ethanol and isopropanol;
the esters comprise at least one of ethyl acetate and butyl acetate;
the ketones include at least one of acetone and butanone;
the corresponding solvent is nontoxic, slightly toxic or low toxic solvent, and at least comprises water and ethanol.
8. The device for regulating and controlling the performance of the medium-adjustable wave-absorbing metamaterial according to the claim 1, wherein the liquid medium mixing component (4) is a liquid mixing tube having a tubular structure and containing a plurality of layers of spiral fan-shaped structure baffles arranged axially along the tube.
9. The device for regulating and controlling the performance of the medium adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 8, wherein the liquid medium is pushed by the liquid medium pushing assembly (2) and enters the liquid medium mixing assembly (4) through a liquid conveying pipeline, the liquid medium is mixed once when passing through a spiral baffle in the liquid medium mixing assembly (4), the other end of the liquid medium mixing assembly (4) is completely mixed, and the mixed liquid medium enters the medium adjustable wave-absorbing metamaterial (6) through the liquid conveying pipeline.
10. The device for regulating and controlling the performance of the dielectric adjustable wave-absorbing metamaterial according to claim 1, wherein the total reflection layer is made of a metal material or a non-metal material with high reflection performance.
11. The device for regulating and controlling the performance of the dielectric tunable wave-absorbing metamaterial according to the claim 10, wherein,
the metal material at least comprises a copper foil and an aluminum foil;
the non-metallic material comprises at least one of a carbon fiber surfacing mat, a continuous carbon fiber composite material, a graphite film and a carbon nanotube film.
12. The device for regulating and controlling the performance of the dielectric adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 1, wherein the at least one metamaterial layer containing the micro channels is at least one of polymethyl methacrylate, silicone rubber, epoxy resin, phenolic resin and light-cured resin.
13. The device for regulating and controlling the performance of the dielectric adjustable wave-absorbing metamaterial according to claim 12, wherein the micro channel is designed to reciprocate repeatedly and to overlap vertically and horizontally, and comprises at least one of a spiral micro channel, an omega micro channel or an I-shaped micro channel.
14. The device for regulating and controlling the performance of the dielectric adjustable wave-absorbing metamaterial according to claim 13, wherein the microchannels in each metamaterial layer have the same or different structures and are communicated with each other.
15. The device for regulating and controlling the performance of the dielectric tunable wave-absorbing metamaterial according to claim 1, wherein the total reflection layer is bonded to the metamaterial layer by using resin, and the resin comprises at least one of epoxy resin, phenolic resin, light-cured resin and polyacrylate.
16. The device for regulating and controlling the performance of the dielectric tunable wave-absorbing metamaterial according to claim 1, wherein a resin containing a highly conductive filler is used between the total reflection layer and the metamaterial layer.
17. The device for regulating and controlling the performance of the dielectric tunable wave-absorbing metamaterial according to claim 16, wherein the resin containing the highly conductive filler is conductive silver paste, and the conductive silver paste can be cured to realize both efficient bonding of the total reflection layer and the metamaterial layer and efficient reflection of electromagnetic waves.
18. The device for regulating and controlling the performance of the medium-adjustable wave-absorbing metamaterial based on the microfluidic technology as claimed in claim 1, wherein the liquid medium recoverer (8) is connected to the medium-adjustable wave-absorbing metamaterial (6) through a liquid conveying pipeline, and excess solution discharged from the medium-adjustable wave-absorbing metamaterial (6) is collected, separated and recycled.
19. The device for regulating and controlling the performance of the dielectric tunable wave-absorbing metamaterial according to claim 18, wherein the separation is performed by at least one of extraction and distillation.
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