CN105384159A - Usage of manganese dioxide coated carbon particle dielectric materials as electromagnetic wave absorption materials - Google Patents
Usage of manganese dioxide coated carbon particle dielectric materials as electromagnetic wave absorption materials Download PDFInfo
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Abstract
The invention discloses usage of manganese dioxide coated carbon particle dielectric materials as electromagnetic wave absorption materials and belongs to the technical field of wave absorption materials. A preparation method comprises the steps of adding carbon particles into a mixed solution and absolute ethyl alcohol for ultrasonic treatment, wherein the mixed solution is obtained by mixing sodium dodecyl benzene sulfonate and 10%-concentration diluted hydrochloric acid according to a mass ratio of 1 to 10; performing ultrasonic treatment for 2 hours in deionized water, adding potassium permanganate, subjecting manganese dioxide generated under the action of water bath to nucleation and growing on the surfaces of the carbon particles to form a manganese dioxide coated carbon composite structure. According to the usage, the preparation process is simple and easy to operate, and the manganese dioxide is coated evenly. The manganese dioxide coated carbon particle composite structure has outstanding conductive performance and a dielectric loss property, can be used as a dielectric loss medium and has good application prospects in the field of electromagnetic wave absorption materials.
Description
Technical field
The present invention relates to absorbing material technical field, particularly relate to the application that a kind of Manganse Dioxide carbon coated particle dielectric materials is used as electromagnetic wave absorbent material.
Background technology
The development of electronic industry makes the application of electronics more and more extensive, and the electromagnetic radiation caused thus and electromagnetic interference cause serious electromagnetic environmental pollution, have become the fourth-largest source of pollution after topsoil, sound pollution and water pollutions at present.The large measure reducing or alleviate electromagnetic pollution adopts electromagnetic wave absorbent material (abbreviation absorbing material), changes electromagnetic energy into heat energy and consume.Current absorbing material military, building and civilian etc. in greatly paid close attention to and comparatively widespread use.The absorbing material of excellent property needs to possess suitable conductivity, dielectric properties or magnetic property, and is divided into electrical loss medium, dielectric loss medium and magnetic loss medium thus.
Manganse Dioxide is a kind of transition metal oxide, due to its basic structural unit [MnO
6] octahedral on-link mode (OLM) difference, thus multiple crystalline structure form can be formed.Again in view of Manganse Dioxide preparation technology is easy, morphology controllable, has been widely used in the fields such as battery electrode material, catalyzer, oxygenant at present.Meanwhile, Manganse Dioxide is also a kind of important dielectric loss medium.But because the electroconductibility of Manganse Dioxide is poor, it mainly relies on interfacial polarization under electromagnetic field effect and interfacial polarization to electromagnetic absorption, in actual applications in order to improve its dielectric properties, often need the Manganse Dioxide being obtained special appearance by the preparation technology of complexity, or by Material claddings such as Manganse Dioxide and the better carbon black of conductivity, carbon nanotubes.
Due to the difference of the surface tissue of Manganse Dioxide and carbon black or carbon nanotube, be difficult to reach uniform effect in recombination process, thus directly affect the dielectric properties of matrix material.Carbon black or carbon nanotube are carried out the coated dispersion problem that can solve carbon material preferably of Manganse Dioxide, thus improve the performance of matrix material.The people such as Lee and Zhao finds the chemical property that can improve matrix material at carbon ball Surface coating one deck Manganse Dioxide.It is coated that carbon nanotube is carried out Manganse Dioxide by the people such as the Qin, finds the performance of its ratio capacitance considerably beyond simple Manganse Dioxide and carbon nanotube.Regrettably, report Manganse Dioxide carbon coated particle being used for dielectric loss material is not yet found that there is at present.
Summary of the invention
The object of this invention is to provide the application that a kind of Manganse Dioxide carbon coated particle dielectric materials is used as electromagnetic wave absorbent material.Preparation technology of the present invention is simple to operation, and Manganse Dioxide is evenly coated.This Manganse Dioxide carbon coated particle composite structures has excellent conductivity and dielectric loss performance, as a kind of dielectric loss medium, can have a good application prospect in electromagnetic wave absorbent material field.
The present invention adopts following technical scheme:
Manganse Dioxide carbon coated particle dielectric materials of the present invention is used as the application of electromagnetic wave absorbent material, and Manganse Dioxide carbon coated particulate composite has good dielectric properties; Its dielectric properties regulate and control by the size and reaction times adjusting carbon granule.
The concrete steps of the preparation method of Manganse Dioxide carbon coated particle dielectric materials of the present invention are as follows:
(1) carbon granule to be joined in mixed acid solution supersound process 1 ~ 2 hour, then 3 times are respectively cleaned with dehydrated alcohol and deionized water, deionized water for ultrasonic is joined 1 ~ 2 hour after filtration, form suspension liquid, the weightmeasurement ratio of carbon granule and deionized water is 0.05 ~ 0.1:50 ~ 100g/ml;
(2) by being 1:3 ~ 10 with carbon granule mass ratio, potassium permanganate is added in the carbon containing suspension liquid of step (1), magnetic agitation 3 ~ 6 hours;
(3) mixing solutions of step (2) is transferred in 60 ~ 100 DEG C of waters bath with thermostatic control and is incubated 6 ~ 12 hours;
(4) by the product deionized water of step (3) and dehydrated alcohol centrifugal, washing repeatedly, in 100 DEG C of dryings 8 hours, Manganse Dioxide carbon coated particulate composite is obtained.
In step (1), the diameter of carbon granule is 50 ~ 300nm.
In step (1), mixing acid is the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid, and its mass ratio is 1:10.
In step (1), the weightmeasurement ratio of further carbon granule and deionized water is 0.1:100g/ml.
In step (1), the weightmeasurement ratio of further carbon granule and deionized water is 0.1:50g/ml.
In step (2), further carbon granule and potassium permanganate mass ratio are 1:3 ~ 1:6.
In step (3), further water bath with thermostatic control temperature is 80 ~ 90 DEG C, and the reaction times is 6 ~ 12 hours.
The present invention uses mixing acid process carbon granule and the object of ultrasonic 1 ~ 2 hour is impurity in order to remove carbon granule surface and group, to improve carbon granule dispersing uniformity in deionized water.
Principle involved in the present invention is: in the whipping process in potassium permanganate and carbon aqueous suspension, high manganese ion is adsorbed on carbon granule surface, and generate Manganse Dioxide die attach on carbon granule surface by redox reaction, Manganse Dioxide is grown up gradually on carbon granule surface, thus forms carbon coated grain pattern.
Because Manganse Dioxide specific conductivity is lower, when electromagnetic wave incident is to composite structure surface, Manganse Dioxide coating layer can play the effect of surface impedance coupling, and guide electromagnetic waves arrives carbon granule surface, by the carbon granule institute loss that specific conductivity is higher; The hertzian wave be not depleted, also can partly by the loss of Manganse Dioxide coating layer institute in reflection process at carbon granule surface reflection; Meanwhile, because Manganse Dioxide coating layer particle is less, specific surface area is comparatively large, also can play certain loss effect to incident electromagnetic wave.
Positively effect of the present invention is as follows:
Preparation method of the present invention is simple and easy to operate, low production cost; Manganse Dioxide is even at carbon granule Surface coating, adds the specific surface area of Manganse Dioxide; Manganse Dioxide specific conductivity is lower, improves the surface impedance coupling of composite structure, greatly improves the drain performance of matrix material to incident electromagnetic wave.
Accompanying drawing explanation
Fig. 1 is the TEM image of the coated carbon black pellet of Manganse Dioxide prepared by embodiment 1;
Fig. 2 is the dielectric properties image of the coated carbon black pellet of Manganse Dioxide prepared by embodiment 1;
Fig. 3 is the TEM image of the coated carbon black pellet of Manganse Dioxide prepared by embodiment 2;
Fig. 4 is the dielectric properties image of the coated carbon black pellet of Manganse Dioxide prepared by embodiment 2;
Fig. 5 is the TEM image of Manganse Dioxide carbon coated ball particle prepared by embodiment 3;
Fig. 6 is the dielectric properties image of Manganse Dioxide carbon coated ball particle prepared by embodiment 3.
Embodiment
The following examples describe in further detail of the present invention.
Embodiment 1
Be that the carbon black pellet 0.1g of 50nm to join in the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid 1:10 in mass ratio supersound process 1 hour by diameter, then respectively clean 3 times with dehydrated alcohol and deionized water.Join 50ml deionized water for ultrasonic 2 hours after being filtered by carbon black, form suspension liquid;
Getting potassium permanganate 0.3g adds in the suspension liquid of above-mentioned carbon black, stirs 6 hours;
Above-mentioned mixing solutions is transferred in water bath with thermostatic control, 80 DEG C of insulations 6 hours;
After having reacted, gained precipitate with deionized water and dehydrated alcohol respectively filtered, clean 3 times, then 100 DEG C of dryings 8 hours, obtain the coated carbon black composite powder of Manganse Dioxide.
Mixed with paraffin with the mass ratio of 1:1 by coated for above-mentioned Manganse Dioxide carbon black composite powder, be made into internal diameter 3.04mm, external diameter is the annular thin slice of 7.00mm, tests its specific inductivity in 2 ~ 18GHz range of frequency and dielectric loss.
The transmission electron microscope photo of gained powder as shown in Figure 1.
The dielectric properties of gained powder in 2 ~ 18GHz range of frequency as shown in Figure 2.
As seen from Figure 1, Manganse Dioxide particles coat, on carbon granule surface, forms the uniform coating layer of one deck.As seen from Figure 2, the dielectric loss of the coated carbon black composite powder of Manganse Dioxide in 2 ~ 18GHz frequency range can reach 0.4 ~ 0.5, is obviously better than pure manganese bioxide material.
Embodiment 2
Be that the carbon black pellet 0.1g of 100nm to join in the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid 1:10 in mass ratio supersound process 2 hours by diameter, then 3 times are respectively cleaned with dehydrated alcohol and deionized water, 100ml deionized water for ultrasonic is joined 2 hours after filtration, make carbon black pellet be dispersed in water, form stable suspension liquid;
Getting potassium permanganate 0.6g joins in the suspension liquid of above-mentioned carbon black, stirs 3 hours;
Above-mentioned mixing solutions is transferred in water bath with thermostatic control, 80 DEG C of insulations 12 hours;
After having reacted, gained precipitate with deionized water and dehydrated alcohol respectively filtered, clean 3 times, then 100 DEG C of dryings 8 hours, obtain the coated carbon black composite powder of Manganse Dioxide.
Mixed with paraffin with the mass ratio of 1:1 by coated for above-mentioned Manganse Dioxide carbon black composite powder, be made into internal diameter 3.04mm, external diameter is the annular thin slice of 7.00mm, tests its specific inductivity in 2 ~ 18GHz range of frequency and dielectric loss.
The transmission electron microscope photo of gained powder as shown in Figure 3.
The dielectric properties of gained powder in 2 ~ 18GHz range of frequency as shown in Figure 4.
As seen from Figure 3, sheet Manganse Dioxide particles coat, on carbon granule surface, defines the complete coating layer of one deck at carbon blacksurface.Along with the reaction times extended to 12 hours by 6 hours, covered effect comparatively Fig. 1 obtains obvious lifting.Fig. 4 can find out, the dielectric properties of composite powder are largely increased, and real part of permittivity reaches 15 ~ 45, and dielectric loss can reach 0.75 ~ 1.05, is far superior to pure manganese bioxide material.
Embodiment 3
Be that the carbon ball particle 0.1g of 300nm to join in the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid 1:10 in mass ratio supersound process 1 hour by diameter, then respectively clean 3 times with dehydrated alcohol and deionized water.Join 50ml deionized water for ultrasonic 2 hours after being filtered by carbon ball, form suspension liquid;
Getting potassium permanganate 0.6g adds in above-mentioned suspension liquid, stirs 6 hours;
Above-mentioned mixing solutions is transferred in water bath with thermostatic control, 90 DEG C of insulations 6 hours;
After having reacted, gained precipitate with deionized water and dehydrated alcohol respectively filtered, clean 3 times, then 100 DEG C of dryings 8 hours, obtain Manganse Dioxide carbon coated ball composite powder.
Mixed with paraffin with the mass ratio of 1:1 by coated for above-mentioned Manganse Dioxide carbon black composite powder, be made into internal diameter 3.04mm, external diameter is the annular thin slice of 7.00mm, tests its specific inductivity in 2 ~ 18GHz range of frequency and dielectric loss.
The transmission electron microscope photo of gained powder as shown in Figure 5.
The dielectric properties of gained powder in 2 ~ 18GHz range of frequency as shown in Figure 6.
As seen from Figure 5, sheet manganese dioxide nano particles coat is on carbon ball particle surface, and form the uniform coating layer of one deck, Manganse Dioxide particle size is about 10nm.Fig. 6 can find out, the real part of permittivity of composite powder in 2 ~ 18GHz frequency range is about 20 ~ 50, and imaginary part is about 20 ~ 90, and dielectric loss can reach 1.3 ~ 1.7, exceedes currently reported pure manganese bioxide material.
Embodiment 4
Be that the carbon ball particle 0.05g of 300nm to join in the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid 1:10 in mass ratio supersound process 1 hour by diameter, then respectively clean 3 times with dehydrated alcohol and deionized water.Join 50ml deionized water for ultrasonic 2 hours after being filtered by carbon ball, form suspension liquid;
Getting potassium permanganate 0.6g adds in above-mentioned suspension liquid, stirs 6 hours;
Above-mentioned mixing solutions is transferred in water bath with thermostatic control, 100 DEG C of insulations 6 hours;
After having reacted, gained precipitate with deionized water and dehydrated alcohol respectively filtered, clean 3 times, then 100 DEG C of dryings 8 hours, obtain Manganse Dioxide carbon coated ball composite powder.
Embodiment 5
Be that the carbon black pellet 0.1g of 100nm to join in the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid 1:10 in mass ratio supersound process 2 hours by diameter, then 3 times are respectively cleaned with dehydrated alcohol and deionized water, 100ml deionized water for ultrasonic is joined 2 hours after filtration, make carbon black pellet be dispersed in water, form stable suspension liquid;
Getting potassium permanganate 1g joins in the suspension liquid of above-mentioned carbon black, stirs 3 hours;
Above-mentioned mixing solutions is transferred in water bath with thermostatic control, 70 DEG C of insulations 6 hours;
After having reacted, gained precipitate with deionized water and dehydrated alcohol respectively filtered, clean 3 times, then 100 DEG C of dryings 8 hours, obtain the coated carbon black composite powder of Manganse Dioxide.
Embodiment 6
Be that the carbon black pellet 0.1g of 50nm to join in the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid 1:10 in mass ratio supersound process 1 hour by diameter, then respectively clean 3 times with dehydrated alcohol and deionized water.Join 50ml deionized water for ultrasonic 2 hours after being filtered by carbon black, form suspension liquid;
Getting potassium permanganate 0.3g adds in the suspension liquid of above-mentioned carbon black, stirs 6 hours;
Above-mentioned mixing solutions is transferred in water bath with thermostatic control, 60 DEG C of insulations 12 hours;
After having reacted, gained precipitate with deionized water and dehydrated alcohol respectively filtered, clean 3 times, then 100 DEG C of dryings 8 hours, obtain the coated carbon black composite powder of Manganse Dioxide.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (8)
1. Manganse Dioxide carbon coated particle dielectric materials is used as an application for electromagnetic wave absorbent material, it is characterized in that: Manganse Dioxide carbon coated particulate composite has good dielectric properties; Its dielectric properties regulate and control by the size and reaction times adjusting carbon granule.
2. apply as claimed in claim 1, it is characterized in that: the concrete steps of the preparation method of described Manganse Dioxide carbon coated particle dielectric materials are as follows:
(1) carbon granule to be joined in mixed acid solution supersound process 1 ~ 2 hour, then 3 times are respectively cleaned with dehydrated alcohol and deionized water, deionized water for ultrasonic is joined 1 ~ 2 hour after filtration, form suspension liquid, the weightmeasurement ratio of carbon granule and deionized water is 0.05 ~ 0.1:50 ~ 100g/ml;
(2) by being 1:3 ~ 10 with carbon granule mass ratio, potassium permanganate is added in the carbon containing suspension liquid of step (1), magnetic agitation 3 ~ 6 hours;
(3) mixing solutions of step (2) is transferred in 60 ~ 100 DEG C of waters bath with thermostatic control and is incubated 6 ~ 12 hours;
(4) by the product deionized water of step (3) and dehydrated alcohol centrifugal, washing repeatedly, in 100 DEG C of dryings 8 hours, Manganse Dioxide carbon coated particulate composite is obtained.
3. apply as claimed in claim 2, it is characterized in that: in step (1), the diameter of carbon granule is 50 ~ 300nm.
4. apply as claimed in claim 2, it is characterized in that: in step (1), mixing acid is the mixing solutions of Sodium dodecylbenzene sulfonate and 10% concentration dilute hydrochloric acid, its mass ratio 1:10.
5. apply as claimed in claim 2, it is characterized in that: in step (1), the weightmeasurement ratio of carbon granule and deionized water is 0.1:100g/ml.
6. apply as claimed in claim 2, it is characterized in that: in step (1), the weightmeasurement ratio of carbon granule and deionized water is 0.1:50g/ml.
7. apply as claimed in claim 2, it is characterized in that: in step (2), carbon granule and potassium permanganate mass ratio are 1:3 ~ 1:6.
8. apply as claimed in claim 2, it is characterized in that: in step (3), water bath with thermostatic control temperature is 80 ~ 90 DEG C, and the reaction times is 6 ~ 12 hours.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854802A (en) * | 2016-05-17 | 2016-08-17 | 遵义师范学院 | Cadmium-containing sewage treatment nano-composite material and preparing method thereof |
| CN107708396A (en) * | 2017-09-29 | 2018-02-16 | 横店集团东磁股份有限公司 | A kind of hierarchical structure wave absorbing agent and preparation method thereof |
| CN109699165A (en) * | 2019-01-29 | 2019-04-30 | 山东大学 | Three-dimensional porous manganese oxide-cobalt composite electromagnetic absorption material and the preparation method and application thereof |
| CN113373553A (en) * | 2021-07-07 | 2021-09-10 | 上海圣石生物医学科技有限公司 | Carbon-based microwave absorbing material, preparation method and health-care product |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854802A (en) * | 2016-05-17 | 2016-08-17 | 遵义师范学院 | Cadmium-containing sewage treatment nano-composite material and preparing method thereof |
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| CN109699165A (en) * | 2019-01-29 | 2019-04-30 | 山东大学 | Three-dimensional porous manganese oxide-cobalt composite electromagnetic absorption material and the preparation method and application thereof |
| CN109699165B (en) * | 2019-01-29 | 2020-01-17 | 山东大学 | Three-dimensional porous manganese oxide-cobalt composite electromagnetic wave absorption material and preparation method and application thereof |
| CN113373553A (en) * | 2021-07-07 | 2021-09-10 | 上海圣石生物医学科技有限公司 | Carbon-based microwave absorbing material, preparation method and health-care product |
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Application publication date: 20160309 |