CN113479940A - Carbon nanotube and carbonyl iron self-assembly wave absorbing agent and preparation method thereof - Google Patents
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 114
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 97
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 97
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 68
- 238000001338 self-assembly Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 38
- 230000005611 electricity Effects 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 26
- 238000001035 drying Methods 0.000 claims abstract description 18
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 12
- 239000003093 cationic surfactant Substances 0.000 claims abstract description 12
- 238000000707 layer-by-layer assembly Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 32
- 238000000967 suction filtration Methods 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 11
- 238000009210 therapy by ultrasound Methods 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 239000011734 sodium Substances 0.000 claims description 8
- -1 sodium alkyl benzene Chemical class 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 5
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 4
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical compound CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
- 229940077388 benzenesulfonate Drugs 0.000 claims description 2
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 2
- 239000002079 double walled nanotube Substances 0.000 claims description 2
- 239000000194 fatty acid Substances 0.000 claims description 2
- 229930195729 fatty acid Natural products 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000002048 multi walled nanotube Substances 0.000 claims description 2
- 239000002109 single walled nanotube Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 18
- 238000005303 weighing Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 241000282414 Homo sapiens Species 0.000 description 4
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- 239000011358 absorbing material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 239000012188 paraffin wax Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
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- 241000656145 Thyrsites atun Species 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/16—Carbonyls
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/168—After-treatment
- C01B32/174—Derivatisation; Solubilisation; Dispersion in solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
Abstract
The invention discloses a carbon nano tube and carbonyl iron self-assembly wave absorbing agent and a preparation method thereof, wherein the carbon nano tube is treated by an anionic surfactant, so that the surface of the carbon nano tube is negatively charged; simultaneously treating carbonyl iron by using a cationic surfactant to enable the surface of the carbonyl iron to be positively charged; in an aqueous solution, the carbon nano tube with negative electricity and carbonyl iron with positive electricity are combined in an electrostatic self-assembly mode, and then the carbon nano tube and the carbonyl iron are prepared into the composite wave absorbing agent with the self-assembly of the carbon nano tube and the carbonyl iron after drying. The prepared composite wave absorbing agent has excellent electromagnetic wave absorption performance.
Description
Technical Field
The invention belongs to the field of materials, relates to a wave absorbing agent, and particularly relates to a carbon nano tube and carbonyl iron self-assembly wave absorbing agent and a preparation method thereof.
Background
With the development of social science and technology, electromagnetic waves are widely applied in the fields of communication, electrical appliances, military, medical treatment and the like, and people enjoy convenience in technological progress and are also inevitably influenced by electromagnetic wave radiation. Electromagnetic radiation can have adverse effects on the human body, and can firstly affect sensory nerve endings of the human body, thereby affecting the central nerve. Under the influence, organs such as hearts, pancreas and eyes of human bodies are easy to feel uncomfortable, and severe situations can cause palpitation, blood pressure reduction and even vision loss. Therefore, the electromagnetic wave absorbing material plays an important role in stealth technology and protection of human beings. The good wave-absorbing material is required to be thin in thickness, light in weight and excellent in electromagnetic wave absorption performance, wherein the effective absorption bandwidth is the most important index for evaluating the wave-absorbing performance of the wave-absorbing agent.
Carbonyl iron is a common typical magnetic metal wave-absorbing material and is obtained by decomposing iron pentacarbonyl, the raw material of the carbonyl iron is black powder, the particles of the carbonyl iron are spherical, the particle size of the carbonyl iron is 1-10 mu m, and the iron content of the material per se is more than 97%. In recent years, in many studies on carbonyl iron, in order to increase the width-thickness ratio and shape anisotropy thereof and achieve the purpose of breaking through the Snoek's limitation, researchers ball-mill the micro-morphology of the original carbonyl iron from a spherical shape into a flake shape. Carbonyl iron is a material which is earlier applied to the wave-absorbing field in magnetic metal, but along with the development of science and technology, the requirement on the effective absorption bandwidth of the carbonyl iron is higher and higher.
The carbon nano tube has light weight and high conductivity, and has been widely applied to the wave absorbing field as a dielectric loss type wave absorbing agent. However, when the carbon nanotube is used as a wave absorbing agent alone, the loss mechanism is still limited to the resistance type loss related to the conductivity, and the defects of poor impedance matching, weak absorption strength, narrow wave absorbing frequency band and the like still exist.
Disclosure of Invention
Aiming at the defects, the invention provides a preparation method of a carbon nano tube and carbonyl iron self-assembly wave-absorbing agent, the carbon nano tube and the carbonyl iron are effectively combined together in an electrostatic self-assembly mode, and the finally prepared composite wave-absorbing agent has wider effective absorption bandwidth and wide application prospect in the wave-absorbing field
In order to achieve the above object, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which comprises the following steps: treating the carbon nano tube by using an anionic surfactant to make the surface of the carbon nano tube carry negative charges; simultaneously treating carbonyl iron by using a cationic surfactant to enable the surface of the carbonyl iron to be positively charged; in an aqueous solution, the carbon nano tube with negative electricity and carbonyl iron with positive electricity are combined in an electrostatic self-assembly mode, and then the carbon nano tube and the carbonyl iron are prepared into the composite wave absorbing agent with the self-assembly of the carbon nano tube and the carbonyl iron after drying.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: the method comprises the following steps:
step one, preparing a carbon nano tube with negative electricity: preparing an anionic surfactant aqueous solution; adding the carbon nano tube into an anionic surfactant aqueous solution, and carrying out ultrasonic treatment for 2-3 hours; filtering and drying to obtain the carbon nano tube with negative electricity;
step two, preparing sheet carbonyl iron with positive charges: preparing a cationic surfactant aqueous solution; adding carbonyl iron into a cationic surfactant aqueous solution, and carrying out ultrasonic treatment for 2-3 hours; carrying out suction filtration and drying to obtain positively charged carbonyl iron;
step three, preparing the carbon nano tube and carbonyl iron self-assembly composite wave absorbing agent: preparing a carbon nano tube with negative electricity and carbonyl iron with positive electricity into an aqueous solution; stirring for 30min, and standing the mixed solution for 30 min; and (4) carrying out suction filtration and drying to obtain the composite wave absorbing agent formed by self-assembling the carbon nano tube and the carbonyl iron.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the carbon nano tube is one or more of a single-wall carbon nano tube, a double-wall carbon nano tube and a multi-wall carbon nano tube.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the carbonyl iron is one or more of spherical carbonyl iron or flaky carbonyl iron.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the anionic surfactant is one or more of sodium alkyl benzene sulfonate, sodium alkyl sulfate, sodium alkyl polyoxyethylene ether sulfate and sodium fatty acid.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the cationic surfactant is one or more of cetyl trimethyl ammonium bromide, octadecyl trimethyl ammonium chloride and dodecyl dimethyl amine oxide.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the concentration of the anionic surfactant aqueous solution is 0.05-20 g/L. The dosage ratio of the carbon nano tube to the anionic surfactant aqueous solution is 5 g: 500 mL.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the concentration of the cationic surfactant aqueous solution is 0.05-20 g/L. The dosage ratio of the carbonyl iron to the cationic surfactant aqueous solution is 5 g: 500 mL.
Further, the present invention provides a method for preparing a carbon nanotube and carbonyl iron self-assembled wave absorber, which may further have the following characteristics: wherein the mass ratio of the carbon nano tube with negative electricity to the carbonyl iron with positive electricity is 1:100-20: 100. The concentration of the aqueous solution of the negatively charged carbon nanotubes and the positively charged carbonyl iron was 1.1g/250 mL.
The invention also protects the carbon nano tube and carbonyl iron self-assembly wave absorbing agent prepared by the preparation method.
The invention has the beneficial effects that: the invention provides a carbon nano tube and carbonyl iron self-assembly wave absorbing agent and a preparation method thereof. The strong electrostatic combination is beneficial to generating interface polarization, thereby increasing the wave absorbing performance after compounding. The composite wave absorbing agent combines the advantages of two materials, has a double wave absorbing mechanism of dielectric loss and magnetic loss, has excellent electromagnetic wave absorption performance, and has wide application prospect in the field of electromagnetic wave absorption.
Drawings
FIG. 1 is a wave-absorbing performance diagram of the carbon nanotube and carbonyl iron self-assembled wave-absorbing agent of example 1;
FIG. 2 is a wave-absorbing property diagram of the mixed powder wave-absorbing agent of comparative example 1;
FIG. 3 is a wave-absorbing property diagram of carbonyl iron of comparative example 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a carbon nanotube and carbonyl iron self-assembly wave absorber, and the preparation method comprises the following steps:
step one, preparing a carbon nano tube with negative electricity:
500mL of sodium dodecyl benzene sulfonate aqueous solution with the concentration of 10g/L is prepared;
weighing 5g of carbon nano tube, adding the carbon nano tube into sodium dodecyl benzene sulfonate aqueous solution, and carrying out ultrasonic treatment for 2 hours;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in a 60 ℃ oven for 24 hours to obtain the carbon nano tube with negative charges.
Step two, preparing sheet carbonyl iron with positive charges:
500mL of hexadecyl trimethyl ammonium bromide aqueous solution with the concentration of 10g/L is prepared;
weighing 5g of sheet carbonyl iron, adding the sheet carbonyl iron into a hexadecyl trimethyl ammonium bromide aqueous solution, and carrying out ultrasonic treatment for 2 hours;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in an oven at 60 ℃ for 24h to obtain the sheet carbonyl iron with positive charges.
Step three, preparing the carbon nano tube and carbonyl iron self-assembly composite wave absorbing agent:
preparing a carbon nano tube with negative electricity and carbonyl iron with positive electricity into an aqueous solution;
weighing 0.1g of carbon nano tube with negative charge and 1g of sheet carbonyl iron with positive charge, and preparing into 250ml of aqueous solution;
stirring the solution at the speed of 50rpm for 30min, standing for 30min, and combining the carbon nano tube with negative charge and carbonyl iron with positive charge in an electrostatic self-assembly manner;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in a 60 ℃ oven for 24h to obtain the composite wave absorbing agent with the self-assembled carbon nano tube and carbonyl iron.
The composite wave absorbing agent and paraffin are pressed according to the mass ratio of 7:3, the wave absorbing performance is tested by using a coaxial method, when the thickness of the composite wave absorbing agent is 1.5mm, the effective absorption bandwidth within 2-18GHz is 9.5GHz (8.5-18 GHz), and the test chart of the wave absorbing performance is shown in figure 1, so that the ultra-wideband absorption under the ultra-thin thickness is realized.
Example 2
The embodiment provides a carbon nanotube and carbonyl iron self-assembly wave absorber, and the preparation method comprises the following steps:
step one, preparing a carbon nano tube with negative electricity:
500mL of alkyl sodium sulfate aqueous solution with the concentration of 0.05g/L is prepared;
weighing 5g of carbon nano tube, adding the carbon nano tube into an alkyl sodium sulfate aqueous solution, and carrying out ultrasonic treatment for 3 hours;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in a 60 ℃ oven for 24 hours to obtain the carbon nano tube with negative charges.
Step two, preparing sheet carbonyl iron with positive charges:
preparing 500mL of dodecyl dimethyl amine oxide aqueous solution with the concentration of 0.05 g/L;
weighing 5g of spherical carbonyl iron, adding the spherical carbonyl iron into a dodecyl dimethyl amine oxide aqueous solution, and carrying out ultrasonic treatment for 3 hours;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in an oven at 60 ℃ for 24h to obtain the sheet carbonyl iron with positive charges.
Step three, preparing the carbon nano tube and carbonyl iron self-assembly composite wave absorbing agent:
preparing a carbon nano tube with negative electricity and carbonyl iron with positive electricity into an aqueous solution;
weighing 0.1g of carbon nano tube with negative charge and 10g of sheet carbonyl iron with positive charge, and preparing into 250ml of aqueous solution;
stirring the solution at the speed of 50rpm for 30min, standing for 30min, and combining the carbon nano tube with negative charge and carbonyl iron with positive charge in an electrostatic self-assembly manner;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in a 60 ℃ oven for 24h to obtain the composite wave absorbing agent with the self-assembled carbon nano tube and carbonyl iron.
Example 3
The embodiment provides a carbon nanotube and carbonyl iron self-assembly wave absorber, and the preparation method comprises the following steps:
step one, preparing a carbon nano tube with negative electricity:
500mL of an alkyl polyoxyethylene ether sodium sulfate aqueous solution with the concentration of 20g/L is prepared;
weighing 5g of carbon nano tube, adding the carbon nano tube into an alkyl polyoxyethylene ether sodium sulfate aqueous solution, and carrying out ultrasonic treatment for 2.5 hours;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in a 60 ℃ oven for 24 hours to obtain the carbon nano tube with negative charges.
Step two, preparing sheet carbonyl iron with positive charges:
500mL of octadecyl trimethyl ammonium chloride aqueous solution with the concentration of 20g/L is prepared;
weighing 5g of spherical carbonyl iron, adding the spherical carbonyl iron into an aqueous solution of octadecyl trimethyl ammonium chloride, and carrying out ultrasonic treatment for 2.5 hours;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in an oven at 60 ℃ for 24h to obtain the sheet carbonyl iron with positive charges.
Step three, preparing the carbon nano tube and carbonyl iron self-assembly composite wave absorbing agent:
preparing a carbon nano tube with negative electricity and carbonyl iron with positive electricity into an aqueous solution;
weighing 0.2g of carbon nano tube with negative charge and 1g of sheet carbonyl iron with positive charge, and preparing into 250ml of aqueous solution;
stirring the solution at the speed of 50rpm for 30min, standing for 30min, and combining the carbon nano tube with negative charge and carbonyl iron with positive charge in an electrostatic self-assembly manner;
and carrying out suction filtration treatment on the mixed solution, and drying the obtained paste in a 60 ℃ oven for 24h to obtain the composite wave absorbing agent with the self-assembled carbon nano tube and carbonyl iron.
Comparative example 1
This comparative example provides a mixed powder wave absorber, which is prepared by a method different from that of example 1: the carbon nano tube and the carbonyl iron are not modified and are simply and mechanically blended.
Specifically, the carbon nanotubes in example 1 and the sheet carbonyl iron were mechanically blended in a mass ratio of 1: 10.
The mixed powder wave absorbing agent and paraffin are pressed according to the mass ratio of 7:3, the wave absorbing performance is tested by using a coaxial method, the effective absorption bandwidth of the composite wave absorbing agent in 2-18GHz is only 7.5GHz (10.5-18 GHz) when the thickness of the composite wave absorbing agent is 1.5mm, the test graph of the wave absorbing performance is shown in figure 2, and the effective absorption bandwidth is greatly reduced compared with that of the composite wave absorbing agent in the embodiment 1.
Comparative example 2
According to the comparative example, carbonyl iron is used as a wave absorbing agent, a sheet carbonyl iron and paraffin are subjected to compression ring according to the mass ratio of 7:3, the wave absorbing performance is tested by using a coaxial method, the effective absorption bandwidth of the composite wave absorbing agent in the range of 2-18GHz is only 6.2GHz (9.1-15.3 GHz) when the thickness of the composite wave absorbing agent is 1.5mm, the test chart of the wave absorbing performance is shown in figure 3, and the effective absorption bandwidth is greatly reduced compared with that of the composite wave absorbing agent in example 1.
Comparing example 1 with comparative examples 1 and 2, it can be seen that the carbon nanotubes and carbonyl iron are effectively combined together by the electrostatic self-assembly method used in the invention, and a composite wave absorbing agent with self-assembled carbon nanotubes and carbonyl iron is prepared. After the composite wave absorbing agent is combined in the electrostatic self-assembly mode, the effective absorption bandwidth of the wave absorbing agent can be greatly improved, the ultra-wide-band absorption is really realized, and the wave absorbing agent has wide application prospect in the field of electromagnetic wave absorption. Meanwhile, the electrostatic self-assembly mode also provides a new idea for compounding the wave absorber and widening the effective absorption bandwidth, and has certain guiding significance for preparing the novel carbon material wave absorber.
Claims (10)
1. A preparation method of a carbon nano tube and carbonyl iron self-assembly wave absorbing agent is characterized by comprising the following steps:
treating the carbon nano tube by using an anionic surfactant to make the surface of the carbon nano tube carry negative charges; simultaneously treating carbonyl iron by using a cationic surfactant to enable the surface of the carbonyl iron to be positively charged;
in an aqueous solution, the carbon nano tube with negative electricity and carbonyl iron with positive electricity are combined in an electrostatic self-assembly mode, and then the carbon nano tube and the carbonyl iron are prepared into the composite wave absorbing agent with the self-assembly of the carbon nano tube and the carbonyl iron after drying.
2. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 1, wherein the method comprises the following steps:
the method comprises the following steps:
step one, preparing a carbon nano tube with negative electricity: preparing an anionic surfactant aqueous solution; adding the carbon nano tube into an anionic surfactant aqueous solution, and carrying out ultrasonic treatment for 2-3 hours; filtering and drying to obtain the carbon nano tube with negative electricity;
step two, preparing sheet carbonyl iron with positive charges: preparing a cationic surfactant aqueous solution; adding carbonyl iron into a cationic surfactant aqueous solution, and carrying out ultrasonic treatment for 2-3 hours; carrying out suction filtration and drying to obtain positively charged carbonyl iron;
step three, preparing the carbon nano tube and carbonyl iron self-assembly composite wave absorbing agent: preparing a carbon nano tube with negative electricity and carbonyl iron with positive electricity into an aqueous solution; stirring for 30min, and standing the mixed solution for 30 min; and (4) carrying out suction filtration and drying to obtain the composite wave absorbing agent formed by self-assembling the carbon nano tube and the carbonyl iron.
3. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 1, wherein the method comprises the following steps:
wherein the carbon nano tube is one or more of a single-wall carbon nano tube, a double-wall carbon nano tube and a multi-wall carbon nano tube.
4. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 1, wherein the method comprises the following steps:
wherein the carbonyl iron is one or more of spherical carbonyl iron or flaky carbonyl iron.
5. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 1, wherein the method comprises the following steps:
wherein the anionic surfactant is one or more of sodium alkyl benzene sulfonate, sodium alkyl sulfate, sodium alkyl polyoxyethylene ether sulfate and sodium fatty acid.
6. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 1, wherein the method comprises the following steps:
wherein the cationic surfactant is one or more of cetyl trimethyl ammonium bromide, octadecyl trimethyl ammonium chloride and dodecyl dimethyl amine oxide.
7. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 2, wherein the method comprises the following steps:
wherein the concentration of the anionic surfactant aqueous solution is 0.05-20 g/L.
8. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 2, wherein the method comprises the following steps:
wherein the concentration of the cationic surfactant aqueous solution is 0.05-20 g/L.
9. The method for preparing the carbon nanotube and carbonyl iron self-assembly wave absorber according to claim 1, wherein the method comprises the following steps:
wherein the mass ratio of the carbon nano tube with negative electricity to the carbonyl iron with positive electricity is 1:100-20: 100.
10. The carbon nanotube and carbonyl iron self-assembly wave absorber prepared by the preparation method of any one of claims 1 to 9.
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| CN114518453A (en) * | 2022-01-26 | 2022-05-20 | 东北农业大学 | Multi-walled carbon nanotube compound and preparation method and application thereof |
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