CN113306059A - Terahertz modulation material with gradient modulation amplitude and preparation method thereof - Google Patents

Terahertz modulation material with gradient modulation amplitude and preparation method thereof Download PDF

Info

Publication number
CN113306059A
CN113306059A CN202110605055.5A CN202110605055A CN113306059A CN 113306059 A CN113306059 A CN 113306059A CN 202110605055 A CN202110605055 A CN 202110605055A CN 113306059 A CN113306059 A CN 113306059A
Authority
CN
China
Prior art keywords
powder
terahertz
modulation
copper
banburying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110605055.5A
Other languages
Chinese (zh)
Other versions
CN113306059B (en
Inventor
李怡俊
张桐瑞
吴振华
胡旻
钟任斌
刘頔威
周俊
刘盛纲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan University
Original Assignee
Sichuan University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan University filed Critical Sichuan University
Priority to CN202110605055.5A priority Critical patent/CN113306059B/en
Publication of CN113306059A publication Critical patent/CN113306059A/en
Application granted granted Critical
Publication of CN113306059B publication Critical patent/CN113306059B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • B22F1/054—Nanosized particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/002—Methods
    • B29B7/005—Methods for mixing in batches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5816—Measuring, controlling or regulating temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2505/00—Use of metals, their alloys or their compounds, as filler
    • B29K2505/08—Transition metals
    • B29K2505/10—Copper
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
    • C08J2491/06—Waxes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/085—Copper
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/001—Conductive additives

Abstract

The invention provides a terahertz modulation material with gradient modulation amplitude and a preparation method thereof. According to the terahertz modulation material, the gradient distribution density of the metal micro-nano powder is obtained in the preparation process, the terahertz modulation intensity of gradient distribution is realized on the same material, the terahertz modulation site with required fixed intensity can be obtained through testing in the later period, the terahertz modulation function is realized, the terahertz modulation material has the characteristics of simplicity in operation and low cost, and the prepared terahertz modulation material can achieve terahertz wave modulation with the intensity amplitude of 0.2-0.8.

Description

Terahertz modulation material with gradient modulation amplitude and preparation method thereof
Technical Field
The invention belongs to the technical field of terahertz modulation, and relates to a terahertz modulation material with gradient modulation amplitude and a preparation method thereof.
Background
The terahertz wave covers the wide bandwidth from microwave to infrared spectrum region (30-3000 μm), and has great application prospect in the fields of imaging, high bandwidth communication, radar and the like. The development of the dynamic terahertz device is the basis of application, including switching, modulation, phase shift and the like. These functions are typically achieved by doping functional materials with controllable optical or electrical parameters, such as semiconductors, liquid crystals, two-dimensional materials, perovskites, and phase change materials.
The terahertz intensity modulator is used as a key component for operating a terahertz signal transmission system, and related research of the terahertz intensity modulator has great significance for further application of terahertz science and technology. Because the electromagnetic response of natural materials to terahertz wave bands is very weak, the natural materials are difficult to be practically applied to modulating terahertz waves, and compared with the rapid development of terahertz emission and detection technologies, the terahertz modulation technology is slow in progress. The research on various functional devices such as terahertz filters, modulators, switches and the like required in the transmission process of terahertz waves is still weak.
The existing terahertz intensity modulators mainly comprise two types, namely an electric control modulator and a light control modulator. At present, electronic control and light control terahertz intensity modulators based on semiconductors such as silicon and the like and phase change materials such as vanadium dioxide and the like have more defects: firstly, a resonance loop of the electronic control terahertz intensity modulator has large capacitance and series resistance, and certain time delay is needed for electrifying and discharging, so that the modulation speed of the modulator is relatively slow; and conductive electrodes (such as conductive silicon and the like) are needed on the upper surface and the lower surface of the electric control terahertz wave modulator to realize the electric control modulator. The electrodes have free electrons and can absorb terahertz waves, so that insertion loss is introduced, and terahertz modulation efficiency is influenced; secondly, the mobility rate of photogenerated carriers in the silicon semiconductor and vanadium dioxide materials is low, and the service life of the photogenerated carriers is long (about microsecond level), so that the modulation speed of terahertz waves is limited by the electronic control and light control modulator based on the silicon semiconductor and the vanadium dioxide materials, and the modulation speed is low; and thirdly, the modulation bandwidth of the modulators such as silicon semiconductor and vanadium dioxide is narrow. In summary, the modulation speed and modulation bandwidth of the existing terahertz intensity modulator cannot meet the requirements of terahertz research, and need to be improved.
The high polymer is used as a widely applied base material, has the advantages of strong mechanical property, long service life and the like, and the conductivity of the composite material is dynamically tuned by filling materials with higher conductivity, such as gold, silver, metal or nickel, and the like into the high polymer base material to change the conductive network of the high polymer. Because the terahertz waves are very sensitive to the conductivity of the medium, the terahertz transmission amplitude of the conductive polymer composite material can be dynamically adjusted. Therefore, it can provide great potential for flexible terahertz smart devices without the need to integrate additional metal structures.
However, for the terahertz intensity modulator, how to stably obtain the terahertz modulation wave with the required fixed intensity is the fundamental purpose, although the metal/high polymer-based mixed material also has the terahertz modulation function, the accuracy and consistency of the modulation intensity are very poor, and even if the same process is adopted, the modulation intensity of the metal/high polymer-based modulation plates prepared in different batches can be deviated due to errors and natural random factors in the preparation process. On the other hand, the modulation intensity of the terahertz modulation material is usually the test data of the finished product which cannot be obtained through preparation, so that the preparation process conditions of other modulation intensities can be obtained through reverse reasoning, a large number of repeated process condition experimental operations are needed to obtain the terahertz modulation effect with fixed intensity, and although the material cost is low, the cost for exploring the process conditions is too high, so that no relevant report of preparing the terahertz modulation material by using a metal/high polymer-based mixed material exists in the prior art.
If the above problem can be solved, it is expected that the production cost of the terahertz wave modulator will be greatly reduced, and the research and development related to terahertz waves will be greatly promoted.
Disclosure of Invention
The terahertz modulation material realizes the terahertz modulation intensity of gradient distribution on the same material through the gradient distribution density of metal micro-nano powder in the preparation process, and a terahertz modulation site with required fixed intensity can be obtained through later testing, so that the terahertz modulation function is realized, and meanwhile, the terahertz modulation material has the characteristics of simple operation and low cost, and can achieve terahertz wave modulation with the intensity amplitude of 0.2-0.8.
In order to achieve the purpose, the invention adopts the technical scheme formed by the following technical measures.
A preparation method of a terahertz modulation material with gradient modulation amplitude comprises the following steps in parts by weight:
(1) preparing high-conductivity metal micro-nano powder with the average particle size of 50-500 mu m;
(2) mixing and mixing 100 parts of high-conductivity metal micro-nano powder and 5-50 parts of low-viscosity polymer powder, and banburying to obtain a metal/low-viscosity polymer composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 3-10 minutes, the rotating speed is 10-40 r/min, and the banburying temperature is 90-150 ℃;
wherein the low-viscosity polymer is a polymer with the viscosity of 10-500 CPS at 140 ℃;
(3) crushing the metal/low-viscosity polymer composite material obtained in the step (2) to obtain metal/low-viscosity polymer composite powder with the average particle size not less than that of the high-conductivity metal micro-nano powder and not more than 600 mu m;
(4) mixing the metal/low-viscosity polymer composite powder obtained in the step (3) and the high-viscosity polymer superfine powder for thermoplasticity processing according to the mass ratio of 1: (0.5-3), adding the mixture into a mold, and performing thermosetting molding on the mold under the standing condition that the inclination angle of the mold is 0.5-10 degrees relative to the horizontal plane, wherein the molded inclination length is not less than 20mm, and the thickness is not more than 1cm, so as to obtain the terahertz modulation material with the gradient modulation amplitude;
wherein the high-viscosity polymer superfine powder for thermoplasticity processing is a polymer with the viscosity of 500-1000 CPS under the environment condition of 140 ℃.
The terahertz modulation material with the gradient modulation amplitude prepared by the preparation method has the modulation intensity amplitude of 0.2 at the lowest and 0.8 at the highest, and the intensity amplitude difference of 0.1 at the lowest and 0.6 at the highest.
The terahertz modulation material with the gradient modulation amplitude is tested and marked with the position point with the required fixed strength amplitude, and different positions of the same material can be used as materials or components of the terahertz strength debugger.
The invention is based on the principle that in the thermosetting molding process, the arrangement of the inclination angle of a mold compared with the horizontal plane is utilized, so that the metal/low-viscosity polymer composite powder presents the gradient-type distribution density in the high-viscosity polymer matrix under the influence of gravity factors, the prepared terahertz modulation material presents the gradient modulation amplitude on the inclination length, the marking position point of the required fixed strength amplitude is determined through later-stage test, and the terahertz modulation material with high precision and consistency is finally obtained.
Generally, the high-conductivity metal in step (1) is a high-conductivity raw material known in the art, and mainly includes any one of gold, silver, copper, nickel, titanium and iron, or any one of the above metals. For cost reasons, copper or copper alloys are preferred.
The high-conductivity metal micro-nano powder in the step (1) can be selected from commercially available metal powder with the average particle size of 50-500 microns, or can be subjected to crushing treatment to form metal micro-nano powder with the average particle size of 50-500 microns. If necessary, the preparation process also comprises the pretreatment of the prior art such as cleaning, drying and the like. In order to better illustrate the invention and provide a technical scheme for reference, when the high-conductivity metal is copper, pre-crushing commercially available copper metal foil into single copper metal foil with the thickness not greater than 2cm multiplied by 2cm, and then crushing the single copper metal foil by a high-speed crusher to obtain the high-conductivity metal micro-nano powder, wherein the process parameters of the crushing treatment of the high-speed crusher are as follows: the temperature is 5-25 ℃, the rotating speed is 200-350 r/m, and the grinding is circulated for 3-7 times.
It is worth to be noted that, in the step (2), the high-conductivity metal micro-nano powder and the low-viscosity polymer powder are firstly prepared into the metal/low-viscosity polymer composite material through banburying, so that the high-conductivity metal is firstly wrapped by the low-viscosity polymer, and thus the metal/low-viscosity polymer composite material has certain mechanical properties, and meanwhile, the interface compatibility and the fluidity between the high-conductivity metal and the high polymer which is added subsequently are improved, so that the metal/low-viscosity polymer composite material can have uniform gradient modulation amplitude distribution when being subjected to thermosetting molding under an inclined condition.
Wherein, the low-viscosity polymer powder in the step (2) is preferably polyethylene wax powder, solid paraffin wax powder, etc.
Further, the low viscosity polymer powder in step (2) is preferably polyethylene wax powder, typically, the polyvinyl alcohol is commercially available, and the polyethylene wax is under the grade of RLC-657.
Generally speaking, the particle size of the low-viscosity polymer powder in the step (2) can be selected to be consistent with that of the high-conductivity metal micro-nano powder, or the low-viscosity polymer powder with the commercially available particle size of 0.1-500 μm or mesh number of 100-2000 is selected, so as to ensure the distribution uniformity of the high-conductivity metal.
Generally, in the step (2), the high-conductivity metal micro-nano powder and the low-viscosity polymer powder are mixed, and in order to fully disperse the high-conductivity metal micro-nano powder in the low-viscosity polymer, in order to better explain the invention, a technical scheme for reference is provided: under the condition of a laboratory, when the addition amount of the high-conductivity metal micro-nano powder is not higher than 500g, the mixing is mechanical stirring mixing, wherein the process parameters of the mechanical stirring mixing are as follows: the stirring speed is 30-100 r/min, and the stirring time is 5-30 min. In the actual industrial production, the mixing mode and parameters can be adjusted by those skilled in the art according to the addition amount and considering the industrial amplification effect.
It is worth to be noted that the adding amount of the low-viscosity polymer powder in the step (2) is limited to 5-50 parts, because if the adding amount of the low-viscosity polymer is too low, the high-conductivity metal micro-nano powder and the low-viscosity polymer are not high in adhesion, and the interface interaction with a high polymer base material added later is poor; if the addition amount of the low-viscosity polymer is too high, the concentration of the high-conductivity metal micro-nano powder is reduced, so that the construction of a conductive network of a material is influenced, and the accuracy and gradient difference of the terahertz modulation intensity of a final product are influenced. In the actual operation process, the specific ratio of the low-viscosity polymer powder to the high-conductivity metal micro-nano powder can be reasonably adjusted according to the performance requirement on the terahertz modulation material, so as to obtain the required terahertz modulation material. Preferably, the low-viscosity polymer powder is added in an amount of 10 to 30 parts.
And (3) crushing the metal/low-viscosity polymer composite material in the step (3) to obtain metal/low-viscosity polymer composite powder with the average particle size not less than that of the high-conductivity metal micro-nano powder and the average particle size not more than 600 mu m, wherein the crushing method of the high-conductivity metal micro-nano powder can be referred to. In order to better illustrate the invention and to provide a technical solution for reference: the crushing treatment is carried out through a high-speed crusher, wherein the technological parameters of the crushing treatment of the high-speed crusher are as follows: the temperature is 5-30 ℃, the rotating speed is 200-400 r/min, and the grinding is circulated for 1-9 times.
The high-viscosity polymer superfine powder for thermoplasticity processing in the step (4) is usually polymer superfine powder which can be subjected to thermoplasticity processing in the prior art and has the viscosity of 500-1000 CPS under the environment condition of 140 ℃, and the polymer superfine powder comprises LDPE superfine powder, HDPE superfine powder, PVDF superfine powder and the like.
Generally, the high viscosity polymer superfine powder for thermoplastic processing in step (4) is prepared by pulverizing to a particle size of 50-500 μm, or selecting a commercially available high viscosity polymer superfine powder with a particle size of 50-500 μm or a mesh size of 30-300 meshes.
It is worth to be noted that, in order to better enable the terahertz modulation material to have a gradient modulation amplitude, the inventor of the present invention finds, based on experimental facts, that when the average particle size of the highly conductive metal micro-nano powder in step (1) is selected to be 50-500 μm, a better gradient modulation amplitude distribution effect is achieved, and if the particle size of the highly conductive metal micro-nano powder is less than 1 μm, namely, the highly conductive metal micro-nano powder is a nano-scale powder, because the nano-scale material has better dispersibility and stronger fluidity than that of the micron-scale material, a gradient is not easily formed; if the particle size of the high-conductivity metal micro-nano powder is larger than 600 μm, the formed material is easy to cause phase separation, and the continuity of gradient modulation is greatly influenced. The inventor of the present invention finds, through comparative experiments, that when the average particle size of the highly conductive metal micro-nano powder in step (1) is preferably selected to be 50 to 100 μm, a better gradient modulation amplitude distribution effect is further obtained.
Similarly, after the metal/low-viscosity polymer composite material is prepared by banburying in the step (2), the high-conductivity metal micro-nano powder is wrapped by the low-viscosity polymer, the average particle size is not less than that of the high-conductivity metal micro-nano powder, and the average particle size of the obtained metal/low-viscosity polymer composite powder is not more than 600 mu m according to the crushing treatment mode.
It is worth noting that the thickness of the formed metal/low viscosity polymer composite powder is limited to be not more than 1cm in the step (4), because the metal/low viscosity polymer composite powder has good compatibility and flowability in the high viscosity polymer matrix, and if the thickness of the formed metal/low viscosity polymer composite powder is too large, the metal/low viscosity polymer composite powder is concentrated at the bottom of the formed mould, so that a product or a material with modulated amplitude uniform gradient distribution cannot be obtained. However, if the compatibility and the fluidity between the two are reduced, the gradient distribution phenomenon cannot be more uniform under the inclined condition. Therefore, the invention is based on experimental facts, and the molding thickness of the prepared terahertz debugging material is limited to be not higher than 1cm, and the terahertz debugging material is generally molded into a plate on the basis of the condition. In addition, due to the thickness limitation, on the basis of referring to the conventional process, those skilled in the art try to obtain the gradient change mold molding of the modulation amplitude by making the thickness change in a trapezoid shape, for example, the manner of molding the special-shaped mold such as a trapezoid shape, a triangular shape, etc., because the thickness needs to be greater than 1cm, the gradient distribution of the modulation amplitude is not good, or because the thickness is not greater than 1cm, the fixed intensity amplitude required by the test is difficult. Meanwhile, too low thickness can cause the requirement on the accuracy of the die to be too high, and the prepared modulation material has limited mechanical properties, which affects the practicability of the modulation material, so that the thickness is preferably 1-10 mm.
Wherein, the thermosetting molding in the step (4) is defined as a thermosetting molding process without shearing action, and mainly comprises a flat vulcanization press plate method, vacuum molding, matched die thermoforming and the like. In order to better illustrate the invention and provide a preferable technical scheme, the thermosetting molding is a flat vulcanization pressing plate method, and the technological parameters of the flat vulcanization pressing plate method are as follows: the hot pressing temperature is 140-180 ℃, the hot pressing pressure is 7-20 MPa, the hot pressing time is 4-15 minutes, the cold pressing pressure is 7-20 MPa, and the cold pressing time is 5-20 minutes.
It is worth noting that, in the above process parameters, the hot pressing time greatly affects the distribution density of the metal/low viscosity polymer composite powder in a gradient form in the thermosetting polymer matrix, and the inventors of the present invention found through practical comparison experiments that, when the inclination angle of the mold is 3 ° and the inclination length is 10cm, the hot pressing time is close to 4 minutes, and the distribution gradient difference of the metal/low viscosity polymer composite powder in the prepared terahertz modulation material reaches the maximum.
In order to better illustrate the invention and provide a most preferred technical solution:
in order to prepare the terahertz modulation material with the modulation intensity amplitude of 0.2 at the lowest and the modulation amplitude of 0.8 at the highest, the preparation method comprises the following steps in parts by weight:
(1) preparing copper micro-nano powder with the average particle size of 50-500 mu m;
(2) mixing and banburying 100 parts of copper micro-nano powder and 15-30 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 3-7 minutes, the rotating speed is 15-35 r/min, and the banburying temperature is 110-140 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 10-25 ℃, the rotating speed is 250 r/min, and the grinding is circulated for 3-7 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: (1-2), adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is not less than 10cm, and the thickness is not more than 1cm, so as to obtain the terahertz modulation material with gradient modulation amplitude; wherein, the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 150-180 ℃, the hot pressing pressure is 7-15 MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 7-15 MPa, and the cold pressing time is 5-20 minutes.
The main innovation point of the invention is that the inventor accidentally finds that the prepared gradient terahertz modulation material has good terahertz modulation performance and mechanical performance by compounding the metal micro-nano powder with the low-viscosity polymer and then adding the compounded metal micro-nano powder into a polymer matrix. The inventor finds that the interaction between the micro-nano metal powder and the low-viscosity polymer is fully utilized to improve the interface acting force between the metal and the polymer matrix, then the metal/low-viscosity polymer composite material is filled in the polymer matrix to construct a conductive network, and meanwhile, the characteristics of a gradient flat vulcanization pressing plate are utilized to prepare the novel terahertz modulation material with excellent mechanical properties.
According to the terahertz modulation material prepared by the invention, through the test of the inventor of the invention, under the experimental condition that the frequency of the terahertz modulation material is 0.5-1.5THz terahertz waves in a laboratory, the terahertz modulation capacity can achieve the modulation of the amplitude of 0.2-0.8.
The invention has the following beneficial effects:
1. the technical scheme of the invention introduces the polymer base material as the main raw material of the terahertz modulation material for the first time, realizes the efficient modulation of terahertz, and provides a new way for utilizing the polymer compound.
2. The method is mature in process method, has the characteristics of simplicity in operation and low cost, and the modulation capacity of the prepared gradient terahertz modulation material can be up to the modulation of the amplitude of 0.2-0.8.
3. According to the invention, the high polymer matrix provides a framework for the gradient terahertz modulation material, so that the dimensional stability and the scouring resistance stability of the material can be ensured, and the service life of the material is prolonged. The gradient terahertz modulation material prepared by the invention has obvious advantages in terahertz modulation characteristics, and meanwhile, the gradient structure enables the material to be easily used for parts of other products, various product shapes can be realized through different dies, and the gradient terahertz modulation material has potential favorable application in the fields of imaging, high-bandwidth communication, radar and the like.
Drawings
Fig. 1 is a photomicrograph of a terahertz modulating material prepared in example 1 of the present invention. The modulation amplitudes of the upper, middle and lower three point positions are respectively measured to be 0.2, 0.4 and 0.8.
Fig. 2 is a gradient terahertz modulation diagram of the terahertz modulation material prepared in embodiment 1 of the present invention. Wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.8.
Fig. 3 is a photograph of the terahertz modulation material prepared in embodiment 1 of the present invention during the terahertz test.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings. It should be noted that the examples given are not to be construed as limiting the scope of the invention, and that those skilled in the art will be able to make numerous insubstantial modifications and adaptations of the invention in light of the teachings herein.
After the material sample is manufactured, the following experimental steps are implemented to perform terahertz wave modulation test on the sample:
experimental equipment: the terahertz time-domain spectroscopy system comprises a THz-TDS (terahertz-time domain spectroscopy) transmission light path, a two-dimensional electric displacement platform, a computer (LabVIEW scanning acquisition program) and an air drying compressor.
The experimental environment is as follows: humidity < 7.5%.
The experimental contents and steps are as follows:
a terahertz time-domain spectroscopy system transmission light path is well established, terahertz waves are emitted from a light guide antenna, the terahertz waves are converged within the range of 2mm in diameter through an optical reflector and a lens, the terahertz waves pass through a test area and then are incident on the light guide antenna through the lens and the reflector for measurement, when the test area is vacuum or atmosphere, transmitted terahertz light beams are not attenuated, the data are stored as reference in a system, when a sample exists in the test area, the terahertz waves are modulated, the amplitude of the terahertz waves is attenuated, the detected terahertz waves are different from a reference value, and the terahertz waves are pulse signals, so that an ultra-wide band of 0.1-5 THz can be obtained after the frequency domain is expanded, and the absorption characteristics of the sample on the frequency band can be obtained.
In order to measure the modulation characteristics of the terahertz waves on different gradients on a gradient material sample, a displacement system is built in a measurement area, and during measurement, the displacement system drives the sample to move, so that the gradient characteristics of different points are obtained.
Because water has stronger absorption to terahertz wave, use ya keli safety cover, cover whole test platform to use air drying compressor to input dry air in the cover, guarantee that the humidity in test space is below 7.5%.
Through the measurement of the sample, the sample realizes the density change with one-dimensional linear characteristic on the same sample wafer through a special technical means, namely the linear density gradient change is realized, and due to the metal doping, the sample has certain absorption characteristic for terahertz waves, and different metal doping densities have different absorption characteristics, so that the modulation function for terahertz waves is realized on the same sample wafer. The test result is shown in fig. 2 of the attached drawing of the specification, and from the spatial position 0, the samples at different positions have linearly changing absorption characteristics for terahertz waves of different frequency bands.
Polyethylene wax is selected as a commercial grade of RLC-657.
LDPE is chosen for commercial designation LD 615.
Example 1
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.8.
Example 2
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 8 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.6.
Example 3
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 12 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.5.
Example 4
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 15 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.4.
Example 5
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 5 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.6.
Example 6
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 7 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.4.
Example 7
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 9 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
Performing a terahertz wave modulation test by using the terahertz modulation material as a sample, wherein the modulation terahertz frequency width is 0.5-1.5 THz; the modulation amplitude is 0.2-0.3.
Example 8
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into a single copper foil with the specification of 2cm multiplied by 2cm, then adding the single copper foil into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 5 ℃ and the rotating speed to be 350 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 5 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 3 minutes, the rotating speed is 40 r/min, and the banburying temperature is 90 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 400 r/m, and the grinding is circulated for 1 time;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 0.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the condition that the inclination angle of the mold is 0.5 degrees compared with the horizontal plane, wherein the molded inclination length is 5cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 140 ℃, the hot pressing pressure is 7MPa, the hot pressing time is 10 minutes, the cold pressing pressure is 7MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 50 multiplied by 1 (mm).
Example 9
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 25 ℃ and the rotating speed to be 200 r/min, and circularly crushing for 7 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 50 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 10 minutes, the rotating speed is 10 r/min, and the banburying temperature is 150 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 30 ℃, the rotating speed is 200 r/min, and the grinding is circulated for 9 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 3, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 10 degrees compared with the horizontal plane, wherein the molded inclination length is 20cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 180 ℃, the hot pressing pressure is 20MPa, the hot pressing time is 10 minutes, the cold pressing pressure is 20MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 200 multiplied by 1 (mm).
Example 10
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing commercially available silver foil into single silver foil with the specification of 1cm multiplied by 1cm, then adding the single silver foil into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 15 ℃ and the rotating speed to be 280 r/min, and circularly crushing for 5 times to obtain silver micro-nano powder;
(2) mixing and banburying 100 parts of silver micro-nano powder and 40 parts of solid paraffin powder to obtain a silver/solid paraffin composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 8 minutes, the rotating speed is 25 r/min, and the banburying temperature is 130 ℃;
(3) crushing the silver/solid paraffin composite material obtained in the step (2) to obtain silver/solid paraffin composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 15 ℃, the rotating speed is 300 r/min, and the grinding is circulated for 6 times;
(4) mixing the silver/solid paraffin composite powder obtained in the step (3) and LDPE superfine powder in a mass ratio of 1: 2, adding the mixture into a mold, and molding the mold by a flat vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 2 degrees compared with the horizontal plane, wherein the molded inclination length is 3cm, and the thickness is 5mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 15MPa, the hot pressing time is 12 minutes, the cold pressing pressure is 18MPa, and the cold pressing time is 16 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 30 multiplied by 5 (mm).
Example 11
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing commercially available silver foil into single silver foil with the specification of 1cm multiplied by 1cm, then adding the single silver foil into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 15 ℃ and the rotating speed to be 280 r/min, and circularly crushing for 5 times to obtain silver micro-nano powder;
(2) mixing and banburying 100 parts of silver micro-nano powder and 25 parts of polyethylene wax powder to obtain a silver/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 8 minutes, the rotating speed is 25 r/min, and the banburying temperature is 130 ℃;
(3) crushing the silver/polyethylene wax composite material obtained in the step (2) to obtain silver/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 15 ℃, the rotating speed is 300 r/min, and the grinding is circulated for 6 times;
(4) mixing the silver/polyethylene wax composite powder obtained in the step (3) and HDPE superfine powder according to a mass ratio of 1: 1, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 4 degrees compared with the horizontal plane, wherein the molded inclination length is 5cm, and the thickness is 2mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 150 ℃, the hot pressing pressure is 12MPa, the hot pressing time is 10 minutes, the cold pressing pressure is 16MPa, and the cold pressing time is 12 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 50 multiplied by 2 (mm).
Comparative example 1
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the molded thickness is 2cm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 20 (mm).
The terahertz modulation material prepared by the comparative example can directly observe that a large amount of copper/polyethylene wax composite powder is enriched at the bottom of the inclined end due to overlarge thickness, and cannot obtain a product with uniform modulation amplitude and gradient distribution.
Comparative example 2
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 15 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
The terahertz modulation material prepared by the comparative example can directly observe that the copper/polyethylene wax composite powder is enriched at the bottom of the inclined end due to the overlarge inclination angle, and the modulation amplitude gradient difference is less than 0.1 through tests, so that the terahertz modulation material has no practicability.
Comparative example 3
The preparation method of the terahertz modulation material with the gradient modulation amplitude comprises the following steps in parts by weight:
(1) crushing a commercially available copper foil into single copper foils with the specification of 2cm multiplied by 2cm, then adding the single copper foils into a high-speed crusher for grinding, controlling the temperature of the high-speed crusher to be 10 ℃ and the rotating speed to be 300 r/min, and circularly crushing for 3 times to obtain copper micro-nano powder;
(2) mixing and banburying 100 parts of copper micro-nano powder and 20 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 5 minutes, the rotating speed is 30 r/min, and the banburying temperature is 130 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, shredding is through high-speed rubbing crusher shredding, and high-speed rubbing crusher shredding's technological parameter is: the temperature is 5 ℃, the rotating speed is 300 r/min, and the milling is circulated for 5 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: 1.5, adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the placing condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is 10cm, and the thickness is 1mm, so as to obtain the terahertz modulation material with the gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 160 ℃, the hot pressing pressure is 10MPa, the hot pressing time is 20 minutes, the cold pressing pressure is 10MPa, and the cold pressing time is 10 minutes.
The terahertz modulation material prepared finally is a rectangular plate with the specification of 100 multiplied by 1 (mm).
The terahertz modulation material prepared by the comparative example can directly observe that the copper/polyethylene wax composite powder is enriched at the bottom of the inclined end due to overlong hot pressing time, and the modulation amplitude gradient difference is less than 0.1 through tests, so that the terahertz modulation material has no practicability.

Claims (10)

1. A preparation method of a terahertz modulation material with gradient modulation amplitude is characterized by comprising the following steps in parts by weight:
(1) preparing high-conductivity metal micro-nano powder with the average particle size of 50-500 mu m;
(2) mixing and banburying 100 parts of high-conductivity metal micro-nano powder and 5-50 parts of low-viscosity polymer powder to obtain a metal/low-viscosity polymer composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 3-10 minutes, the rotating speed is 10-40 r/min, and the banburying temperature is 90-150 ℃;
wherein the low-viscosity polymer is a polymer with the viscosity of 10-500 CPS at 140 ℃;
(3) crushing the metal/low-viscosity polymer composite material obtained in the step (2) to obtain metal/low-viscosity polymer composite powder with the average particle size not less than that of the high-conductivity metal micro-nano powder and the average particle size not more than 600 mu m;
(4) mixing the metal/low-viscosity polymer composite powder obtained in the step (3) and the high-viscosity polymer superfine powder for thermoplasticity processing according to the mass ratio of 1: (0.5-3), adding the mixture into a mold, and performing thermosetting molding on the mold under the standing condition that the inclination angle of the mold is 0.5-10 degrees relative to the horizontal plane, wherein the molded inclination length is not less than 20mm, and the thickness is not more than 1cm, so as to obtain the terahertz modulation material with the gradient modulation amplitude;
wherein the high-viscosity polymer superfine powder for thermoplasticity processing is a polymer with the viscosity of 500-1000 CPS at 140 ℃.
2. The method of claim 1, wherein: the high-conductivity metal in the step (1) comprises any one of gold, silver, copper, nickel, titanium and iron or any alloy of the metals.
3. The method of claim 2, wherein: when the high-conductivity metal in the step (1) is selected as copper, pre-crushing commercially available copper metal foil into a single copper metal foil with the thickness not greater than 2cm multiplied by 2cm, and then crushing the single copper metal foil by a high-speed crusher to obtain the high-conductivity metal micro-nano powder, wherein the technological parameters of the crushing treatment of the high-speed crusher are as follows: the temperature is 5-25 ℃, the rotating speed is 200-350 r/m, and the grinding is circulated for 3-7 times.
4. The method of claim 1, wherein: the low-viscosity polymer powder in the step (2) is polyethylene wax powder or solid paraffin wax powder.
5. The method according to claim 4, wherein: the addition amount of the low-viscosity polymer powder in the step (2) is 10-30 parts.
6. The method of claim 1, wherein: the crushing treatment in the step (3) is crushing treatment by a high-speed crusher, wherein the technological parameters of the crushing treatment by the high-speed crusher are as follows: the temperature is 5-30 ℃, the rotating speed is 200-400 r/min, and the grinding is circulated for 1-9 times.
7. The method of claim 1, wherein: the high-viscosity polymer superfine powder for thermoplasticity processing in the step (4) is selected from any one of LDPE superfine powder, HDPE superfine powder and PVDF superfine powder.
8. The method of claim 1, wherein: the thermosetting molding in the step (4) is a plate vulcanization pressing plate method, and the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 140-180 ℃, the hot pressing pressure is 7-20 MPa, the hot pressing time is 4-15 minutes, the cold pressing pressure is 7-20 MPa, and the cold pressing time is 5-20 minutes.
9. The preparation method according to claim 1, which is characterized by comprising the following steps in parts by weight:
(1) preparing copper micro-nano powder with the average particle size of 50-500 mu m;
(2) mixing and banburying 100 parts of copper micro-nano powder and 15-30 parts of polyethylene wax powder to obtain a copper/polyethylene wax composite material; wherein, the technological parameters of banburying treatment are as follows: banburying time is 3-7 minutes, the rotating speed is 15-35 r/min, and the banburying temperature is 110-140 ℃;
(3) crushing the copper/polyethylene wax composite material obtained in the step (2) to obtain copper/polyethylene wax composite powder; wherein, the crushing treatment is the crushing treatment by a high-speed crusher, and the technological parameters of the crushing treatment by the high-speed crusher are as follows: the temperature is 10-25 ℃, the rotating speed is 250 r/min, and the grinding is circulated for 3-7 times;
(4) and (3) mixing the copper/polyethylene wax composite powder obtained in the step (3) with LDPE superfine powder according to a mass ratio of 1: (1-2), adding the mixture into a mold, and molding the mold by a plate vulcanization pressing plate method under the condition that the inclination angle of the mold is 3 degrees compared with the horizontal plane, wherein the molded inclination length is not less than 10cm, and the thickness is not more than 1cm, so as to obtain the terahertz modulation material with gradient modulation amplitude; the technological parameters of the plate vulcanization pressing plate method are as follows: the hot pressing temperature is 150-180 ℃, the hot pressing pressure is 7-15 MPa, the hot pressing time is 4 minutes, the cold pressing pressure is 7-15 MPa, and the cold pressing time is 5-20 minutes.
10. The terahertz modulation material prepared by the preparation method according to any one of claims 1 to 9.
CN202110605055.5A 2021-05-31 2021-05-31 Terahertz modulation material with gradient modulation amplitude and preparation method thereof Active CN113306059B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110605055.5A CN113306059B (en) 2021-05-31 2021-05-31 Terahertz modulation material with gradient modulation amplitude and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110605055.5A CN113306059B (en) 2021-05-31 2021-05-31 Terahertz modulation material with gradient modulation amplitude and preparation method thereof

Publications (2)

Publication Number Publication Date
CN113306059A true CN113306059A (en) 2021-08-27
CN113306059B CN113306059B (en) 2022-01-28

Family

ID=77376696

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110605055.5A Active CN113306059B (en) 2021-05-31 2021-05-31 Terahertz modulation material with gradient modulation amplitude and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113306059B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124198A (en) * 1989-01-23 1992-06-23 Minnesota Mining And Manufacturing Company Metal fiber mat/polymer composite
CN1331729A (en) * 1998-10-22 2002-01-16 宇部日东化成株式会社 Organic-inorganic composite graded material, method for prepn. thereof and use thereof
US20060003152A1 (en) * 2003-11-25 2006-01-05 Youngs Ian J Composite materials
WO2010102731A1 (en) * 2009-03-13 2010-09-16 Bayer Materialscience Ag Mould consisting of carbon nanoparticle polymer blends having the gradient property of electric volume conductivity
CN102115558A (en) * 2010-12-29 2011-07-06 四川大学 High-conductivity polymer carbon nanotube composite material and micro-processing method thereof
CN106671386A (en) * 2016-12-27 2017-05-17 四川大学 Conductive polymer tube with controllable axial conductivity and radial conductivity, and preparation method thereof
CN110344968A (en) * 2019-06-03 2019-10-18 黑龙江睿雨能量子科技有限公司 A kind of manufacturing method of the strong magnetic fuel-economizing stick of Terahertz anion
CN111154264A (en) * 2020-01-06 2020-05-15 四川大学 Flexible terahertz dynamic regulation and control material based on stress driving and preparation method thereof
CN111730924A (en) * 2020-06-28 2020-10-02 电子科技大学 Terahertz wave-absorbing material with gradient aperture structure and preparation method thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5124198A (en) * 1989-01-23 1992-06-23 Minnesota Mining And Manufacturing Company Metal fiber mat/polymer composite
CN1331729A (en) * 1998-10-22 2002-01-16 宇部日东化成株式会社 Organic-inorganic composite graded material, method for prepn. thereof and use thereof
US20060003152A1 (en) * 2003-11-25 2006-01-05 Youngs Ian J Composite materials
WO2010102731A1 (en) * 2009-03-13 2010-09-16 Bayer Materialscience Ag Mould consisting of carbon nanoparticle polymer blends having the gradient property of electric volume conductivity
CN102115558A (en) * 2010-12-29 2011-07-06 四川大学 High-conductivity polymer carbon nanotube composite material and micro-processing method thereof
CN106671386A (en) * 2016-12-27 2017-05-17 四川大学 Conductive polymer tube with controllable axial conductivity and radial conductivity, and preparation method thereof
CN110344968A (en) * 2019-06-03 2019-10-18 黑龙江睿雨能量子科技有限公司 A kind of manufacturing method of the strong magnetic fuel-economizing stick of Terahertz anion
CN111154264A (en) * 2020-01-06 2020-05-15 四川大学 Flexible terahertz dynamic regulation and control material based on stress driving and preparation method thereof
CN111730924A (en) * 2020-06-28 2020-10-02 电子科技大学 Terahertz wave-absorbing material with gradient aperture structure and preparation method thereof

Also Published As

Publication number Publication date
CN113306059B (en) 2022-01-28

Similar Documents

Publication Publication Date Title
Gou et al. Wheat straw-derived magnetic carbon foams: In-situ preparation and tunable high-performance microwave absorption
Dong et al. Microwave-synthesized poly (ionic liquid) particles: a new material with high electrorheological activity
Padilla et al. Dynamical electric and magnetic metamaterial response at terahertz frequencies
US3951904A (en) Electromagnetic wave absorbing material containing carbon microspheres
Wu et al. Effect of carbon black content on electrical and microwave absorbing properties of polyaniline/carbon black nanocomposites
CN113306059B (en) Terahertz modulation material with gradient modulation amplitude and preparation method thereof
CN109768393A (en) A kind of broadband Terahertz asymmetric transmission device based on Meta Materials
Weldon et al. A wideband microwave double-negative metamaterial with non-Foster loading
CN112292015A (en) MXene/PPy composite wave absorbing agent and preparation method thereof
Mohan et al. Development of cost-effective carbon nanofiber epoxy nanocomposites for lightweight wideband EMI shielding application
Mishra et al. Ultrasonically synthesized dielectric microwave absorbing material from coconut coir dust
Xiang et al. Modification of graphene by polypyrrole and ionic liquids for dual-band electromagnetic interference shielding hydrogels
CN113321930B (en) Method for 3D printing of terahertz modulation material with gradient modulation amplitude based on laser sintering
CN103387704A (en) Ceramic-polymer composite microwave material as well as preparation method and application methods thereof
Faruque et al. Architecture of left-handed metamaterial absorber for absorbing electromagnetic hazards
Yang et al. Electromagnetic characteristics and 3D-printing realization of a lightweight hierarchical wave-absorbing metastructure for low-frequency broadband absorption
Zhu et al. A low-cost stereolithography printed X-band antenna with metallic-plated surface
Wang et al. Design of BCNO@ PPy composites for efficient microwave absorption and thermal management
Pereira et al. Characterization of Dielectric Properties of Graphene and Graphite Using the Resonant Cavity in 5G Test Band
Jiu-sheng et al. Terahertz modulator using 4-N, N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST)/Si hybrid structure
CN106832522B (en) A kind of electromagnetic shielding composite material and preparation method thereof with orientation isolation structure
Meli et al. The effects of SLS on structural and complex permittivity of SLS-HDPE composites
Gul et al. Effect of the improved bulk modulus on dielectric properties of poly (methyl methacrylate)/borax hybrid composite at radar frequencies
Cai et al. Magnetic field vertically aligned Co-MOF-74 derivatives/polyacrylamide hydrogels with bifunction of excellent electromagnetic wave absorption and efficient thermal conduction performances
Ghaderi et al. 3D printing of transparent pH-mediated high-water-content hydrogels for electromagnetic interference (EMI) shielding

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant