CN114498068A - MOFs derived carbon-coated ferrite wave-absorbing material and preparation method and application thereof - Google Patents
MOFs derived carbon-coated ferrite wave-absorbing material and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a magnetic wave-absorbing material technology, in particular to an MOFs-derived carbon-coated ferrite wave-absorbing material and a preparation method and application thereof. The wave-absorbing material of the invention is MnFe2O4Or Mn0.5Zn0.5Fe2O4As a substrate, and MOFs as a carbon source. The core-shell structure enhances the interfacial polarization of the nano particles, the defects and functional groups in the carbon layer promote polarization relaxation loss and dipole polarization, and the impedance matching is optimized. The material still has a porous structure of MOFs after high-temperature carbonization, increases the specific surface area of the material, realizes multiple reflection of electromagnetic waves in the wave-absorbing material, and obviously improves the wave-absorbing performance of the material. As can be seen from FIG. 4, when the coating thickness is 1.64mm, MnFe of the uncoated carbon layer2O4Has a minimum loss value of-25.6 dB, and MnFe after coating the carbon layer2O4The minimum loss value of @ C can reach-41.0 dB, and the wave absorbing performance is obviously improved.
Description
Technical Field
The invention relates to a magnetic wave-absorbing material technology, in particular to an MOFs-derived carbon-coated ferrite wave-absorbing material and a preparation method and application thereof.
Background
In recent years, with the rapid development of electronic communication technology, high-frequency electronic devices are increasingly widely used in people's lives, bringing convenience and generating electromagnetic pollution. Electromagnetic radiation not only interferes with the normal operation of equipment, but also poses a threat to the natural ecological environment and the physical health of people. Therefore, how to develop a microwave absorbing material capable of minimizing electromagnetic interference is a hot problem that many researchers are trying to solve.
The wave-absorbing material plays an important role in the civil field, is one of important application fields of the wave-absorbing material in the military stealth field, and is widely applied to the fields of airplane stealth, ship stealth, flying missile stealth, Tanke stealth and the like at present. The weapon platform without electromagnetic wave stealth is easy to detect, track, strike and even destroy, and is difficult to effectively complete the battle task. In the scientific and technological war, the wave-absorbing material has a particularly prominent effect, has become a countersecret weapon and is a subject of great attention at home and abroad.
According to the types of the wave-absorbing materials, the wave-absorbing material comprises a ferrite wave-absorbing material, a metal micro powder wave-absorbing material, a wave-absorbing composite structure material, a nano wave-absorbing material and a plasma wave-absorbing material, wherein the ferrite wave-absorbing material is widely applied to the wave-absorbing field due to the advantages of high absorption rate, thin coating, wide frequency band and the like. According to the principle of the wave-absorbing material, the wave-absorbing material can be divided into a resistance type loss wave-absorbing material, a dielectric loss wave-absorbing material and a magnetic loss wave-absorbing material, and a carbon material is used as the resistance type loss wave-absorbing material and occupies an important position in the wave-absorbing field by the advantages of low density, special microstructure, excellent dielectric property, strong chemical stability, good composite property and the like.
Disclosure of Invention
The invention aims to provide an MOFs-derived carbon-coated ferrite wave-absorbing material, and a preparation method and application thereof.
The technical scheme of the invention is as follows:
an MOFs-derived carbon-coated ferrite wave-absorbing material comprises an MOFs-derived carbon-coated manganese ferrite wave-absorbing material and an MOFs-derived carbon-coated manganese zinc ferrite wave-absorbing material; is MnFe2O4Or Mn0.5Zn0.5Fe2O4The MOFs providing a carbon source is a zinc-based framework material ZIF-8, and the unit molecular formula of the ZIF-8 is C8H10N4Zn; and 93-97 wt.% of MnFe2O43-7 wt.% ZIF-8 or 93-97 wt.% Mn0.5Zn0.5Fe2O4、3-7wt.％ZIF-8。
A preparation method of MOFs derived carbon-coated ferrite wave-absorbing material comprises the following steps:
step 1, preparing manganese ferrite or manganese zinc ferrite powder by using a hydrothermal method in the prior art: FeCl is added3·6H2O、MnCl2·4H2O or FeCl3·6H2O、MnCl2·4H2O、Zn(NO3)2·6H2Fully dissolving the O III in ethylene glycol, and uniformly stirring at room temperature to form solution A; adding sodium acetate and polyethylene glycol into the solution A, and magnetically stirring for 30min to form a solution B; transferring the solution B into a 100ml polytetrafluoroethylene lining, putting the lining filled with the solution B into a stainless steel reaction kettle, screwing, sealing and putting the stainless steel reaction kettle into an oven for hydrothermal reaction; then cooling to room temperature along with the furnace, and carrying out centrifugal separation to obtain brown precipitate; washing the brown precipitate with anhydrous ethanol and deionized water sequentially, and repeating for 3 times; drying the brown precipitate in a vacuum drying oven at 60 deg.C for 12h, taking out, and grinding to obtain dried manganese ferrite (MnFe)2O4) Powder or manganese-zinc ferrite (Mn)0.5Zn0.5Fe2O4) Powder;
step 3, MnFe2O4@ MOFs core-shell powder material or Mn0.5Zn0.5Fe2O4Synthesis of @ MOFs core-shell powder material: first, taking Zn (NO)3)2·6H2Dissolving O and the manganese ferrite powder or the manganese zinc ferrite powder obtained in the step 2 in methanol to form a solution D; dissolving dimethyl imidazole in a methanol solution to form an E solution; secondly, adding the solution E into the solution D under mechanical stirring to form a solution F, and mechanically stirring for 2 hours at room temperature; then, MnFe is separated from the F solution by means of an external magnet2O4@ MOFs core-shell particles or Mn0.5Zn0.5Fe2O4@ MOFs core-shell particles, separation of MnFe with methanol2O4@ MOFs core-shell particles or Mn0.5Zn0.5Fe2O4Washing the @ MOFs core-shell particles for three times, drying the washed @ MOFs core-shell particles for 12 hours in a vacuum drying oven at the temperature of 60 ℃, taking out the washed @ MOFs core-shell particles and grinding the dried @ MOFs core-shell particles to obtain MnFe2O4@ MOFs core-shell powder material or Mn0.5Zn0.5Fe2O4@ MOFs core-shell powder material;
and 4, carbonizing treatment: the MnFe synthesized in the step 3 is added2O4@ MOFs core-shell powder material or Mn0.5Zn0.5Fe2O4And calcining the @ MOFs core-shell powder material in Ar atmosphere to obtain the black MOFs derivative carbon-coated manganese ferrite wave-absorbing material or the MOFs derivative carbon-coated manganese zinc ferrite wave-absorbing material.
FeCl in step 13·6H2O：MnCl2·4H2O: sodium acetate: polyethylene glycol: the mass-volume ratio of the ethylene glycol is 3-5 g: 1-2 g: 10-20 g: 3-5 g: 120-300ml or FeCl3·6H2O：MnCl2·4H2O： Zn(NO3)2·6H2O, sodium acetate: polyethylene glycol: the mass volume ratio of the ethylene glycol is 3-5 g: 1-2 g: 0.5-1 g: 10-20 g: 3-5 g: 120-300 ml; wherein polyethylene glycol is used as a dispersing agent.
The hydrothermal reaction temperature in the step 1 is 200 ℃, and the reaction time is 12 h.
The centrifugal rotation speed in the step 1 is 2500-.
The surfactant used in the step 2 is sodium polystyrene sulfonate, and the volume concentration of the prepared sodium polystyrene sulfonate is 1-2%.
MnFe in step 32O4With Zn (NO)3)2·6H2O and Mn0.5Zn0.5Fe2O4With Zn (NO)3)2·6H2The mass ratio of O is 1.5-2.5: 0.05-0.3; dimethyl imidazole: zn (NO)3)2·6H2The mass ratio of O is 0.1-0.5: 0.05-0.3.
In the step 4, the heating rate is 3-8 ℃/min, the calcining temperature is 600-.
A MOFs derived carbon-coated ferrite wave-absorbing material is applied to mobile phones and computers, and is rolled into a sheet and attached to the inner parts of cavities of the mobile phones and the computers so as to reduce radiation and interference of electronic components.
The invention has the beneficial effects that:
(1) carbon-coated MnFe of the invention2O4Core-shell nano wave-absorbing material or Mn0.5Zn0.5Fe2O4The core-shell nano wave-absorbing material is MnFe2O4Or Mn0.5Zn0.5Fe2O4As a substrate, and MOFs as a carbon source. The interface polarization of the nano particles is enhanced by the core-shell structure, the polarization relaxation loss and dipole polarization are promoted by the defects and functional groups in the carbon layer, and the impedance matching is optimized. The material still has a porous structure of MOFs after high-temperature carbonization, increases the specific surface area of the material, and realizes multiple electromagnetic waves in the wave-absorbing materialReflection, the wave absorbing performance of the material is obviously improved. As can be seen from FIG. 4, when the coating thickness is 1.64mm, MnFe of the uncoated carbon layer2O4Has a minimum loss value of-25.6 dB, and MnFe after coating the carbon layer2O4The minimum loss value of @ C can reach-41.0 dB, and the wave absorbing performance is obviously improved.
(2) MOFs-derived carbon-coated MnFe of the present invention2O4Or Mn0.5Zn0.5Fe2O4The core-shell nano wave-absorbing material is simple to prepare, short in synthesis period, good in crystallinity and narrow in size distribution.
(3) MOFs-derived carbon-coated MnFe of the present invention2O4Or Mn0.5Zn0.5Fe2O4The shell thickness of the core-shell nano wave-absorbing material can be regulated and controlled through the content of MOFs.
(4) The compounding of the carbonaceous material reduces the density of the material. Meanwhile, the carbon-coated structural material has good chemical stability and composite characteristics, and allows the material to be used in more extreme environments.
Drawings
FIG. 1 is an X-ray diffraction diagram of a wave-absorbing material in example 2 of the invention;
FIG. 2 is a scanning electron microscope image of the wave-absorbing material in example 2 of the present invention;
FIG. 3 is a spectrum diagram of carbon in the wave-absorbing material in example 2 of the present invention;
FIG. 4 is a comparison graph of the wave-absorbing properties of the wave-absorbing material before and after carbon coating in example 2 of the present invention.
Detailed Description
In the following examples, the experimental procedures used, if not indicated, were carried out by conventional methods and the reagents used were purchased commercially.
Example detection characterization:
the phase composition of the wave-absorbing material obtained in the example is characterized by means of an X-ray diffractometer of D8 Advance type;
characterizing the carbon element of the wave-absorbing material obtained in the embodiment by an energy spectrometer attached to a FEI MLA650F type scanning electron microscope;
electromagnetic parameters of the material were tested by means of a 3672B-S, CETC vector network analyzer and reflection loss values were calculated. ZIF-8-DERIVED CARBON-COATED MnFe obtained in the examples2O4Or Mn0.5Zn0.5Fe2O4The mass ratio of the wave-absorbing material to the paraffin is 3: 2, heating to melt, placing in a mould, and making into circular rings with outer diameter and inner diameter of 7mm and 3mm respectively and thickness of 1.5-2.0 mm; measuring the complex permeability and the complex dielectric constant of the circular ring on a 2-18GHz frequency band, wherein the reflectivity RL of the wave-absorbing material is calculated by adopting the following formula:
in the formula (2), epsilonr、μrAnd d is the complex dielectric constant, complex permeability and thickness of the wave-absorbing material, f is the frequency of the electromagnetic wave, c is the propagation speed of the electromagnetic wave in vacuum, and j is an imaginary unit.
Example 1: ZIF-8 (the unit molecular formula of ZIF-8 is C) of the present example8H10N4Zn) derived carbon coated MnFe2O4Preparing a wave-absorbing material:
(1) the formula is as follows:
97wt.％MnFe2O43 wt.% ZIF-8 (wt.% is mass percent)
(2) The preparation process comprises the following steps:
step 1, 3.60g FeCl3·6H2O and 1.32g MnCl2·4H2Fully dissolving O in 160ml of ethylene glycol, and uniformly stirring at room temperature to form solution A; adding 14.4g of sodium acetate and 4.0g of polyethylene glycol into the solution A to form a solution B, and magnetically stirring for 30min by using a HJ-6 magnetic heating stirrer; transferring the solution B into a 100ml polytetrafluoroethylene lining, and then putting the polytetrafluoroethylene lining filled with the solution B into stainless steel for reactionThe kettle is screwed and sealed, and is placed in an oven for hydrothermal reaction at the temperature of 200 ℃ for 12 hours. Cooling to a greenhouse along with the furnace, and performing centrifugal separation at the centrifugal speed of 3000rpm for 10min to obtain brown precipitate. Washing the obtained brown precipitate with anhydrous ethanol and deionized water sequentially, and repeating for 3 times; finally, drying for 12h at 60 ℃ in a vacuum drying oven, taking out and grinding to obtain dried MnFe2O4And (3) powder.
Step 3, 0.08g of Zn (NO) is taken3)2·6H2O and the surface-modified MnFe obtained in the step 22O42.0g of the powder was dissolved in 40ml of methanol to form a D solution; then, 0.13g of dimethylimidazole is dissolved in 40mL of methanol solution to form an E solution; adding the solution E into the solution D under the condition of mechanical stirring, and stirring the mixed solution at room temperature for 2 hours to form the solution containing MnFe2O4@ MOFs core-shell particle solution F; by means of external magnets to convert MnFe2O4@ ZIF-8 core-shell particles were separated from the F solution and washed repeatedly with methanol three times; drying at 60 deg.C for 12h in a vacuum drying oven, taking out, and grinding to obtain dried MnFe2O4@ ZIF-8 core-shell particles.
Example 2: ZIF-8 (the unit molecular formula of ZIF-8 is C) of the present example8H10N4Zn) derived carbon coated MnFe2O4Preparing a wave-absorbing material:
(1) the formula is as follows:
95wt.％MnFe2O45 wt.% ZIF-8 (wt.% in mass.)
(2) The preparation process comprises the following steps:
example 2 differs from example 1 in that Zn (NO) in step 33)2·6H2The mass of O was adjusted to 0.13g, and that of dimethylimidazole was adjusted to 0.22g, in the same manner as in example 1.
Example 3: ZIF-8 (the unit molecular formula of ZIF-8 is C) of the present example8H10N4Zn) derived carbon coated MnFe2O4Preparing a wave-absorbing material:
(1) the formula is as follows:
93wt.％MnFe2O47 wt.% ZIF-8 (wt.% in mass percent)
(2) The preparation process comprises the following steps:
example 3 differs from example 1 in the Zn (NO) in step 33)2·6H2The same procedures as in example 1 were repeated except that O was adjusted to 0.19g and dimethylimidazole was adjusted to 0.32 g.
Example 4: ZIF-8 (the unit molecular formula of ZIF-8 is C) of the present example8H10N4Zn) derived carbon coated Mn0.5Zn0.5Fe2O4Preparing a wave-absorbing material:
(1) the formula is as follows:
95wt.％Mn0.5Zn0.5Fe2O45 wt.% ZIF-8 (wt.% in mass.)
(2) The preparation process comprises the following steps:
step 1, 3.60g FeCl3·6H2O、0.66g MnCl2·4H2O and 0.99g Zn (NO)3)2·6H2Fully dissolving O in 160ml of ethylene glycol, and uniformly stirring at room temperature to form solution A; adding 14.4g of sodium acetate and 4.0g of polyethylene glycol into the solution A to form a solution B, and magnetically stirring for 30min by using a HJ-6 magnetic heating stirrer; transfer the B solution to 100ml of poly-tetraAnd (3) putting the polytetrafluoroethylene lining filled with the solution B into a stainless steel reaction kettle, screwing up and sealing, and putting the stainless steel reaction kettle into an oven for hydrothermal reaction at the reaction temperature of 200 ℃ for 12 hours. Cooling to a greenhouse along with the furnace, and performing centrifugal separation at the centrifugal speed of 3000rpm for 10min to obtain brown precipitate. Washing the obtained brown precipitate with anhydrous ethanol and deionized water sequentially, and repeating for 3 times; finally, drying in a vacuum drying oven at 60 ℃ for 12h, taking out and grinding to obtain dried Mn0.5Zn0.5Fe2O4And (3) powder.
Step 3, 0.08g of Zn (NO) is taken3)2·6H2O and the surface-modified Mn obtained in step 20.5Zn0.5Fe2O42.0g of the powder was dissolved in 40ml of methanol to form a D solution; then, 0.13g of dimethylimidazole is dissolved in 40mL of methanol solution to form an E solution; adding the solution E into the solution D under the condition of mechanical stirring, and stirring the mixed solution at room temperature for 2 hours to form a mixed solution containing Mn0.5Zn0.5Fe2O4@ MOFs core-shell particle solution F; mn by means of external magnets0.5Zn0.5Fe2O4@ ZIF-8 core-shell particles were separated from the F solution and washed repeatedly with methanol three times; drying in a vacuum drying oven at 60 deg.C for 12 hr, taking out, and grinding to obtain dried Mn0.5Zn0.5Fe2O4@ ZIF-8 core-shell particles.
Experimental results for example 2:
ZIF-8 (the unit molecular formula of ZIF-8 is C)8H10N4Zn) as carbon source, and black MnFe obtained by high-temperature carbonization2O4The @ C core-shell nano wave-absorbing material has the advantages that the core-shell structure enhances the interface polarization of nano particles, the defects and functional groups in the carbon layer promote the polarization relaxation loss and dipole polarization, and the impedance matching is optimized. And the sample still has a ZIF-8 porous structure after high-temperature carbonization, so that the specific surface area of the material is increased, multiple reflection of electromagnetic waves in the sample is realized, and the wave absorbing performance of the material is remarkably improved.
MnFe is obtained through analysis and test of a D8 advanced X-ray diffractometer2O4The data of the phase composition of @ C, as shown in FIG. 1, the main phase composition in the XRD pattern is MnFe2O4The diffraction peak of carbon is not obvious, which may be because the addition amount of ZIF-8 is low and carbon formed after high-temperature carbonization is less, so that XRD cannot obviously detect the characteristic peak of ordered carbon;
the surface topography of the sample was characterized by a FEI MLA650F scanning electron microscope, as shown in fig. 2, it can be seen in fig. 2 that after carbon coating, the particles were irregular in shape and had a distinct carbon layer on the surface;
characterizing the carbon element of the sample by an energy spectrometer attached to a FEI MLA650F type scanning electron microscope, and detecting the existence of the C element as shown in FIG. 3;
the electromagnetic parameters of the circular ring are tested by a 3672B-S CETC vector network analyzer, and the reflectivity RL of the wave-absorbing material is calculated by adopting the following formula according to the complex permeability and the complex dielectric constant of the circular ring measured in the 2-18GHz frequency band:
in the formula (2), epsilonr、μrAnd d is the complex dielectric constant, complex permeability and thickness of the wave-absorbing material, f is the frequency of the electromagnetic wave, c is the propagation speed of the electromagnetic wave in vacuum, and j is an imaginary unit. Respectively calculating to obtain an uncoated carbon layer and MnFe coated by carbon2O4The reflection loss ratio of the core-shell nano-material is shown in fig. 4. As can be seen from FIG. 4, when the coating thickness is 1.64mm, MnFe of the uncoated carbon layer2O4Has a minimum loss value of-25.6 dB, and MnFe after coating the carbon layer2O4The minimum loss value of @ C can reach-41.0 dB, and the wave absorption performance is obviously improved.
Claims (9)
1. An MOFs-derived carbon-coated ferrite wave-absorbing material is characterized in that: the composite material comprises an MOFs derived carbon-coated manganese ferrite wave-absorbing material and an MOFs derived carbon-coated manganese zinc ferrite wave-absorbing material; is MnFe2O4Or Mn0.5Zn0.5Fe2O4The MOFs providing a carbon source is a zinc-based framework material ZIF-8, and the unit molecular formula of the ZIF-8 is C8H10N4Zn; and 93-97 wt.% of MnFe2O43-7 wt.% ZIF-8 or 93-97 wt.% Mn0.5Zn0.5Fe2O4、3-7wt.％ZIF-8。
2. A method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material of claim 1, comprising the steps of:
step 1, preparing manganese ferrite or manganese zinc ferrite powder by using a hydrothermal method in the prior art: FeCl is added3·6H2O、MnCl2·4H2O or FeCl3·6H2O、MnCl2·4H2O、Zn(NO3)2·6H2The three components are fully dissolved in the glycol and stirred evenly at room temperature,forming a solution A; adding sodium acetate and polyethylene glycol into the solution A, and magnetically stirring for 30min to form a solution B; transferring the solution B into a 100ml polytetrafluoroethylene lining, putting the lining filled with the solution B into a stainless steel reaction kettle, screwing and sealing, and putting the stainless steel reaction kettle into an oven for hydrothermal reaction; then cooling to room temperature along with the furnace, and carrying out centrifugal separation to obtain brown precipitate; washing the brown precipitate with anhydrous ethanol and deionized water sequentially, and repeating for 3 times; drying the brown precipitate in a vacuum drying oven at 60 ℃ for 12h, taking out and grinding to obtain dry manganese ferrite powder or manganese zinc ferrite powder;
step 2, surface modification of manganese ferrite powder or manganese zinc ferrite powder: adding the manganese ferrite powder or manganese zinc ferrite powder obtained in the step 1 into deionized water diluted with a surfactant to form a solution C, and carrying out ultrasonic treatment on the solution C at room temperature for 30 min; then separating the manganese ferrite powder or the manganese zinc ferrite powder from the solution C by an external magnet, washing the manganese ferrite powder or the manganese zinc ferrite powder by ethanol and deionized water in sequence, and repeating the washing for 3 times; then drying the powder in a vacuum drying oven at 60 ℃ for 12 hours, taking out and grinding the powder to obtain manganese ferrite powder or manganese zinc ferrite powder with modified surface;
step 3, MnFe2O4@ MOFs core-shell powder material or Mn0.5Zn0.5Fe2O4Synthesis of @ MOFs core-shell powder material: first, taking Zn (NO)3)2·6H2Dissolving O and the manganese ferrite powder or the manganese zinc ferrite powder obtained in the step 2 in methanol to form a solution D; dissolving dimethyl imidazole in a methanol solution to form an E solution; secondly, adding the solution E into the solution D under mechanical stirring to form a solution F, and mechanically stirring for 2 hours at room temperature; then, MnFe is separated from the F solution by means of an external magnet2O4@ MOFs core-shell particles or Mn0.5Zn0.5Fe2O4@ MOFs core-shell particles, separation of MnFe with methanol2O4@ MOFs core-shell particles or Mn0.5Zn0.5Fe2O4After washing the @ MOFs core-shell particles three times, inDrying in a vacuum drying oven at 60 ℃ for 12h, taking out and grinding to obtain MnFe2O4@ MOFs core-shell powder material or Mn0.5Zn0.5Fe2O4@ MOFs core-shell powder material;
and 4, carbonizing treatment: the MnFe synthesized in the step 3 is added2O4@ MOFs core-shell powder material or Mn0.5Zn0.5Fe2O4And calcining the @ MOFs core-shell powder material in Ar atmosphere to obtain the black MOFs derivative carbon-coated manganese ferrite wave-absorbing material or the MOFs derivative carbon-coated manganese zinc ferrite wave-absorbing material.
3. The method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material according to claim 2, wherein the method comprises the following steps: FeCl in step 13·6H2O：MnCl2·4H2O: sodium acetate: polyethylene glycol: the mass volume ratio of the ethylene glycol is 3-5 g: 1-2 g: 10-20 g: 3-5 g: 120-300ml or FeCl3·6H2O：MnCl2·4H2O：Zn(NO3)2·6H2O, sodium acetate: polyethylene glycol: the mass volume ratio of the ethylene glycol is 3-5 g: 1-2 g: 0.5-1 g: 10-20 g: 3-5 g: 120-300 ml; wherein polyethylene glycol is used as a dispersing agent.
4. The method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material according to claim 2, wherein the method comprises the following steps: the hydrothermal reaction temperature in the step 1 is 200 ℃, and the reaction time is 12 h.
5. The method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material according to claim 2, wherein the method comprises the following steps: in the step 1, the centrifugal rotation speed is 2500-.
6. The method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material according to claim 2, wherein the method comprises the following steps: the surfactant used in the step 2 is sodium polystyrene sulfonate, and the volume concentration of the prepared sodium polystyrene sulfonate is 1-2%.
7. The method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material according to claim 2, wherein the method comprises the following steps: MnFe in step 32O4With Zn (NO)3)2·6H2O and Mn0.5Zn0.5Fe2O4With Zn (NO)3)2·6H2The mass ratio of O is 1.5-2.5: 0.05-0.3; dimethyl imidazole: zn (NO)3)2·6H2The mass ratio of O is 0.1-0.5: 0.05-0.3.
8. The method for preparing the MOFs-derived carbon-coated ferrite wave-absorbing material according to claim 2, wherein the method comprises the following steps: in the step 4, the heating rate is 3-8 ℃/min, the calcining temperature is 600-.
9. The MOFs-derived carbon-coated ferrite wave-absorbing material of claim 1, which is applied to mobile phones and computers, and is rolled into a sheet and attached to the inner parts of cavities of the mobile phones and the computers so as to reduce radiation and interference of electronic components.
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| CN116948206A (en) * | 2023-09-16 | 2023-10-27 | 山东海化集团有限公司 | Novel method for accurately regulating and controlling morphology of ZIF-8 material |
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| CN116948206A (en) * | 2023-09-16 | 2023-10-27 | 山东海化集团有限公司 | Novel method for accurately regulating and controlling morphology of ZIF-8 material |
| CN116948206B (en) * | 2023-09-16 | 2023-12-29 | 山东海化集团有限公司 | Method for accurately regulating and controlling morphology of ZIF-8 material |
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