CN107502004B - Preparation method and application of microwave-absorbing diatom ooze coating - Google Patents
Preparation method and application of microwave-absorbing diatom ooze coating Download PDFInfo
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- CN107502004B CN107502004B CN201710684432.2A CN201710684432A CN107502004B CN 107502004 B CN107502004 B CN 107502004B CN 201710684432 A CN201710684432 A CN 201710684432A CN 107502004 B CN107502004 B CN 107502004B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000002310 reflectometry Methods 0.000 claims description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 9
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- 238000010438 heat treatment Methods 0.000 claims description 4
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 4
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- 238000001816 cooling Methods 0.000 claims description 3
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 claims description 3
- 229960002089 ferrous chloride Drugs 0.000 claims description 3
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 3
- 239000012279 sodium borohydride Substances 0.000 claims description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 229940010514 ammonium ferrous sulfate Drugs 0.000 claims description 2
- 239000011258 core-shell material Substances 0.000 claims description 2
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F13/00—Coverings or linings, e.g. for walls or ceilings
- E04F13/02—Coverings or linings, e.g. for walls or ceilings of plastic materials hardening after applying, e.g. plaster
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F2290/00—Specially adapted covering, lining or flooring elements not otherwise provided for
- E04F2290/04—Specially adapted covering, lining or flooring elements not otherwise provided for for insulation or surface protection, e.g. against noise, impact or fire
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Paints Or Removers (AREA)
- Aerials With Secondary Devices (AREA)
- Building Environments (AREA)
Abstract
The invention relates to a preparation method and application of a microwave absorbing diatom ooze coating, wherein the method comprises the following steps: mixing the diatom ooze dry powder, the microwave absorbent and the dispersing agent according to the mass ratio of 1:1.5 (18-25), soaking for 10-20 minutes, and electrically stirring for 30-60 minutes to obtain a microwave-absorbing diatom ooze coating; the microwave absorbent is a carbon magnetic heterogeneous structure micro-nano fiber. The specific construction method for the microwave absorbing diatom ooze coating prepared by the method during application is as follows: firstly, scraping bottom layer putty on a cleaned wall surface and grinding the putty, then uniformly dispersing the microwave-absorbing diatom ooze coating on the building wall surface for 2-3 times, then manufacturing a diatom ooze pattern, a coloring or light-collecting layer on the surface of the diatom ooze coating, and curing for 1-2 days to obtain a finished product. The invention is an ideal green environment-friendly building decoration material, has excellent microwave absorption characteristic, beautifies and decorates the environment, and can avoid electromagnetic pollution and information leakage; the electromagnetic shielding wall can be used on the walls of buildings such as electromagnetic shielding darkrooms, district power distribution rooms, military meeting rooms and security rooms, television towers, broadcasting stations, radars, satellite communication launching stations and the like.
Description
Technical Field
The invention relates to the technical field of building coatings, in particular to a preparation method and application of a microwave-absorbing diatom ooze coating.
Background
The diatom ooze material is prepared by taking diatomite as a main raw material and adding various additives such as basic powder, aggregate and the like. The chemical component of diatomite is mainly SiO2In addition, a small amount of Al2O3CaO, MgO, and the like. Has special porous structure and high ratioThe surface area reaches 65m2The decoration wall material can be used for adjusting humidity, purifying air, preventing fire and retarding fire, absorbing sound and reducing noise, protecting eyesight and customizing individuality, thereby being a green and healthy interior and exterior wall decoration wall material. In addition, electromagnetic pollution generated by widely used electronic and electric equipment is becoming serious. Therefore, the development of new, efficient and low-cost microwave absorbing and shielding materials to improve the survivability and the defense capability of weapon systems and reduce electromagnetic radiation pollution has become a popular topic of competitive research in the world military field, the world scientific and technological field, the medical and health field, the environmental protection field and the business field. China also urgently needs to independently research and develop novel high-efficiency microwave absorption building coatings to meet the requirements of military use and civil use.
The wave-absorbing loss medium is filled into building materials (such as cement and ceramic raw materials) to develop a cement-based compound or wave-absorbing ceramic tile with electromagnetic absorption and shielding functions, which is an effective way for reducing the electromagnetic radiation intensity, preventing electromagnetic radiation pollution, protecting the environment, protecting the human health and preventing information leakage. At present, many researches on cement-based building wave-absorbing materials are conducted at home and abroad, and the researches mainly focus on the modification of cement matrixes by wave-absorbing agents such as ultrafine magnetic micro powder (ferrite, iron powder, carbon-based iron/nickel powder and the like), functional fibers (carbon fibers, continuous basalt fiber cloth, iron-containing fibers and the like), carbon-based materials (coke, graphite, activated carbon, carbon black and carbon nano tubes) and the like. Although cement-based composite wave-absorbing materials have been developed rapidly, the problems of narrow frequency band, low absorption, heavy weight, easy sedimentation, high cost, poor stability, poor environmental adaptation, poor durability and the like still exist. However, no report on the microwave absorbing diatom ooze coating is found at present.
According to the invention, water is used as a dispersing agent, the carbon-magnetic heterogeneous structure micro-nano fiber is used as a microwave absorbent, and diatom ooze is used as a substrate material, so that the microwave-absorbing diatom ooze coating is prepared. The obtained microwave-absorbing diatom ooze coating has excellent microwave-absorbing characteristic and is an ideal green and environment-friendly building decoration material. The material can be used as a wall material of buildings seriously polluted by electromagnetism, such as electromagnetic shielding darkrooms, district power distribution rooms, military meeting rooms, security rooms, television towers, broadcasting stations, radars, satellite communication launching stations and the like, can beautify and decorate the environment, can absorb the electromagnetic waves released by electronic equipment, household appliances, communication equipment and the like, protects the human body from being damaged by the electromagnetic waves, and prevents electromagnetic interference and information leakage.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a preparation method and application of a microwave absorbing diatom ooze coating. The preparation method has the advantages of simple preparation flow, low cost, high yield and easy application and popularization; the obtained microwave absorbing diatom ooze coating has excellent microwave absorbing characteristic, is a healthy functional environment-friendly material, and can be used as the decorative wall material of the inner and outer walls of civil and military buildings.
The invention adopts the following technical scheme for solving the technical problems:
a preparation method of a microwave-absorbing diatom ooze coating is characterized in that diatom ooze dry powder and a microwave absorbent are soaked in a dispersing agent for 10-20 minutes, and then are electrically stirred for 30-60 minutes to obtain the microwave-absorbing diatom ooze coating; the mass ratio of the diatom ooze dry powder to the microwave absorbent to the dispersing agent is 1:1.5 (18-25); the microwave absorbent is a carbon magnetic heterogeneous structure micro-nano fiber; the dispersant is water.
The microwave-absorbing diatom ooze coating has excellent microwave-absorbing characteristics, wherein the reflectivity is less than-10 dB within the frequency band range of 2.0-18.0 GHz, and the maximum reflection loss is-41.6-44.0 dB; the reflectivity is less than-20 dB in the frequency band range of 2.0-15.9 GHz, and the effective bandwidth less than-10 dB is 4-4.75 GHz.
The microwave absorbing diatom ooze coating comprises Fe and Fe3O4，Fe3C and C; the morphology is polycrystal Fe, Fe3O4As a nucleus, Fe3C and C are heterostructure micro-nano fibers of the shell, the diameter of the fibers is 0.06-0.30 mu m, and the length-diameter ratio is 5.2-23.3. The saturation magnetization range is 54.92-80.63 emu g-1。
The microwave absorbent is prepared by adopting a precursor template sintering process, and specifically, the newly prepared iron fiber and organic matter are loaded by using a ceramic square boat according to the mass and volume ratio of 0.3g (1-4 m L), the ceramic square boat is placed in a single-temperature tube furnace, the reaction is carried out for 2 hours at 400 ℃ under the protection of high-purity argon or high-purity nitrogen, the furnace is cooled to room temperature under the protection of high-purity argon or high-purity nitrogen after the reaction is finished, and finally, the product is ground to obtain the carbon-magnetic heterogeneous structure micro-nano fiber.
In the method, a one-step heating method is adopted, the heating rate is 6 ℃/min, the gas flow of inert gas is 0.5-1L/min, and the organic matter is one or more of benzene, toluene and acetone.
The iron fiber in the method is prepared by adopting a liquid phase reduction method, and the method specifically comprises the following steps: preparing soluble ferrous salt and water into a solution with a certain concentration according to a certain stoichiometric ratio, quickly adding sodium borohydride into the solution, and magnetically stirring and reacting at room temperature to 50 ℃ for 30-60 min; then centrifugally washing the obtained product by using water and absolute ethyl alcohol, and finally drying the obtained product in vacuum at low temperature to obtain the iron fiber with good dispersibility.
The concentration of the ferric salt is 0.002-0.20 mol. L–1The ratio of the amount of the metal salt to the amount of the reducing agent is 1 (1-2); the soluble ferrous salt is one or more of ferrous chloride hexahydrate, ferrous sulfate heptahydrate and ammonium ferrous sulfate.
The microwave absorbing diatom ooze coating is constructed in multiple steps. The method comprises the following steps: firstly, scraping bottom layer putty on a cleaned wall surface and grinding the putty, then uniformly dispersing the microwave-absorbing diatom ooze coating on the building wall surface for 2-3 times, then manufacturing a diatom ooze pattern, a coloring or light-collecting layer on the surface of the diatom ooze coating, and curing for 1-2 days to obtain a finished product.
The construction environment requirement of the microwave absorption diatom ooze coating is as follows: the water content of the wall surface bottom layer putty is less than or equal to 10 percent, the temperature of the wall body is between 5 and 40 ℃, the pH value is less than 10, the relative humidity of air is not more than 80 percent, and the direct solarization and the too fast drying of sunlight are avoided in the construction process.
The microwave absorbing diatom ooze coating prepared by the method is applied to electromagnetic pollution serious building walls such as electromagnetic shielding darkrooms, district power distribution rooms, military meeting rooms, security rooms, television towers, broadcasting stations, radars or satellite communication launching pads and the like.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
(1) the microwave absorbent provided by the method is a carbon-magnetic heterogeneous structure micro-nano fiber, and has good dispersibility and wide size range (the diameter is 0.06-0.30 mu m, and the length-diameter ratio is 5.2-23.3); the magnetic response is strong, and the saturation magnetization range is 54.92-80.63 emu g-1And the like.
(2) The carbon-magnetic heterogeneous structure micro-nano fiber provided by the method has excellent microwave absorption characteristics, wherein the reflectivity is less than-10 dB in a frequency band range of 2.0-18.0 GHz, and the maximum reflection loss is-41.6-44.0 dB; the reflectivity is less than-20 dB in the frequency band range of 2.0-15.9 GHz, and the effective bandwidth less than-10 dB is 4-4.75 GHz.
(3) The method does not need a surfactant, and is green and efficient. The raw materials are cheap and easy to obtain, and the preparation cost is low. The method has simple and easy preparation process and good repeatability.
(4) The application is wide: the provided microwave absorbing diatom ooze coating is an ideal green environment-friendly building decoration material, has excellent microwave absorbing characteristic, beautifies and decorates the environment, and can avoid electromagnetic pollution and information leakage. The electromagnetic shielding wall can be used on the walls of buildings such as electromagnetic shielding darkrooms, district power distribution rooms, military meeting rooms and security rooms, television towers, broadcasting stations, radars, satellite communication launching stations and the like.
Drawings
FIG. 1 shows the morphology and structure of example 1 observed under a scanning electron microscope.
Figure 2 is the XRD phase structure pattern of example 1.
FIG. 3 shows the morphology and structure of the sample 1 observed under a transmission electron microscope.
FIG. 4 is a selected area electron diffraction pattern of example 1.
FIG. 5 is a Raman spectrum of example 1.
FIG. 6 shows the morphology and structure of example 2 observed under a scanning electron microscope.
FIG. 7 is a static magnetic property curve of examples 2, 4 and 6.
FIG. 8 is a schematic construction view of example 3.
Fig. 9 is a reflectance chart of example 3.
FIG. 10 shows the morphology and structure of example 4 observed under a scanning electron microscope.
Fig. 11 is a reflectance chart of example 5.
FIG. 12 shows the morphology and structure of example 6 observed under a scanning electron microscope.
Fig. 13 is a reflectance chart of example 7.
Detailed Description
The invention will be further described with reference to the following examples and drawings, but is not limited to the following examples.
Example 1:
0.01mol (0.05 mol. L) was added to a 400m L beaker-1)FeSO4·7H2O and 200m L of water, magnetically stirring at room temperature to obtain a light green solution, adding 0.02mol (0.1 mol. L)-1)KBH4Adding the mixture into a beaker, magnetically stirring for 30min, cooling after complete reaction, carrying out magnetic separation, washing, drying at 60 ℃ for 6h to obtain the required iron fiber, loading 0.3g of the iron fiber by using a ceramic square boat with the length of 6cm × 3cm × 1.5.5 cm, adding 2m L benzene into the square boat, placing the square boat in a single-temperature tube furnace, reacting for 2h (the temperature rise time is 1h) at 400 ℃ under the protection of nitrogen, and cooling to room temperature along with the furnace under the protection of nitrogen after the reaction is finished.
The obtained product is black, and the appearance, the phase, the structure observed under a transmission electron microscope, the selected area electron diffraction pattern and the Raman spectrum of the product are respectively shown in figures 1-5. It can be seen that the product is polycrystalline Fe/Fe3The C/C core-shell heterostructure fiber has the fiber diameter of 0.06-0.18 mu m and the length-diameter ratio of 7.70-15.50.
Example 2:
the same procedure as in example 1 was repeated, except that the iron fiber was prepared by using ferrous ammonium sulfate as the iron salt and having an iron ion concentration of 0.2 mol. L-1The organic matter is toluene, the volume of the organic matter is 1m L, the obtained product is black, the appearance observed under a scanning electron microscope is shown in figure 6, the product is a fiber, the diameter of the fiber is 0.13-0.27 mu m, the length-diameter ratio is 12.20-23.30, the magnetostatic performance is shown in figure 7, and the saturation magnetization is 80.63emu·g-1。
Example 3:
taking the product in the example 2 as a microwave absorbent, soaking the diatom ooze dry powder and the microwave absorbent in water for 10 minutes, and then stirring the diatom ooze dry powder and the microwave absorbent for 30 minutes electrically to obtain a microwave-absorbing diatom ooze coating, wherein the mass ratio of the diatom ooze dry powder to the microwave absorbent to the water is 1:1.5:18, the diatom ooze dry powder and the microwave absorbent are distributed on a 180cm × 180cm metal plate by adopting blade coating (the construction schematic diagram is shown in figure 8), for measuring the performance, the diatom ooze dry powder and the microwave absorbent are distributed on the 180cm × cm metal plate to prepare a wave-absorbing coating plate with the thickness of 1.55-8.0 mm, a coloring layer and a light-absorbing layer with the surface of 0.3-0.5 mm, and after curing for 2 days, the microwave-absorbing performance is shown in figure 9, the maximum reflection loss is visible and is less than-10 dB within the frequency band range of 2-18 GHz, the reflection rate is less than-20 dB within the frequency band of 2..
Example 4:
the same procedure as in example 1, except that the organic substance was acetone, the volume was 4m L, the obtained product was black, and the morphology observed under a scanning electron microscope is shown in FIG. 10, in which the product was a fiber, the fiber diameter was 0.13 to 0.30 μm, the aspect ratio was 10.5 to 15.5, the magnetostatic properties are shown in FIG. 7, and the saturation magnetization was 70.92emu g-1。
Example 5:
taking the product in the embodiment 4 as a microwave absorbent, soaking the diatom ooze dry powder and the microwave absorbent in water for 20 minutes, and then stirring the diatom ooze dry powder and the microwave absorbent for 60 minutes electrically to obtain a microwave-absorbing diatom ooze coating, wherein the mass ratio of the diatom ooze dry powder to the microwave absorbent to the water is 1:1.5:25, in order to measure the performance, the diatom ooze dry powder and the microwave absorbent are distributed on a 180cm × 180cm metal plate by brushing, a wave-absorbing coating plate with the thickness of 1.2-8.0 mm is prepared, and the microwave absorption performance is measured after curing for 2 days and shown in a figure 11, wherein the reflectivity is less than-10 dB in a 2.5-18 GHz frequency band range, the maximum reflection loss is-41.6 dB, the reflectivity is less than-20 dB in a 5.2-15.9 GHz frequency band range, and the effective bandwidth is less than-10 dB.
Example 6:
the same procedure as in example 1, except that the iron fiber was prepared by using iron salt of ferrous chloride hexahydrate, which isThe concentration of iron ions is 0.002 mol. L-1. The obtained product is black, the appearance observed under a scanning electron microscope is shown in figure 12, and the product is a fiber, the diameter of the fiber is 0.14-0.19 mu m, and the length-diameter ratio is 5.20-12.90. As shown in FIG. 7, the static magnetic property was that the saturation magnetization was 54.92 cmu. multidot.g-1emu·g-1。
Example 7:
taking the product in the example 6 as a microwave absorbent, soaking the diatom ooze dry powder and the microwave absorbent in water for 20 minutes, and then stirring the diatom ooze dry powder and the microwave absorbent for 60 minutes electrically to obtain a microwave-absorbing diatom ooze coating, wherein the mass ratio of the diatom ooze dry powder to the microwave absorbent to the water is 1:1.5:20, the diatom ooze dry powder and the microwave absorbent are distributed on a 180cm × 180cm metal plate by brush coating to prepare a wave-absorbing coating plate with the thickness of 1.55-8.0 mm, and after curing for 2 days, the microwave absorption performance is shown in figure 13, the reflectivity is less than-10 dB in the frequency band range of 7.5-18 GHz, the maximum reflection loss is-44.0 dB, the reflectivity is less than-20 dB in the frequency band range of 8.0-12.0 GHz, and the effective bandwidth less than-10 dB is 4.0 GHz.
Claims (4)
1. A preparation method of a microwave-absorbing diatom ooze coating is characterized in that diatom ooze dry powder and a microwave absorbent are soaked in a dispersing agent for 10-20 minutes, and then are electrically stirred for 30-60 minutes to obtain the microwave-absorbing diatom ooze coating; the mass ratio of the diatom ooze dry powder to the microwave absorbent to the dispersing agent is 1:1.5 (18-25); the microwave absorbent is a carbon magnetic heterogeneous structure micro-nano fiber; the dispersant is water;
the composition of the microwave absorbent is Fe3C and C; the shape of the alloy is polycrystalline Fe/Fe3The C/C core-shell heterostructure fiber has the fiber diameter of 0.06-0.30 mu m and the length-diameter ratio of 5.2-23.3; the saturation magnetization range is 54.92-80.63 emu g-1；
The microwave-absorbing diatom ooze coating has excellent microwave-absorbing characteristics, wherein the reflectivity is less than-10 dB within the frequency band range of 2.0-18.0 GHz, and the maximum reflection loss is-41.6-44.0 dB; the reflectivity is less than-20 dB in the frequency band range of 2.0-15.9 GHz, and the effective bandwidth less than-10 dB is 4-4.75 GHz;
the microwave absorbent is prepared by adopting a precursor template sintering process, and is specifically prepared by loading newly prepared iron fibers and organic matters into a ceramic square boat according to the mass and volume ratio of 0.3g (1-4 m L), placing the ceramic square boat into a single-temperature tube furnace, reacting for 2 hours at 400 ℃ under the protection of high-purity argon or high-purity nitrogen, cooling to room temperature along with the furnace, and finally grinding the product to obtain the carbon-magnetic heterogeneous structure micro-nano fiber, wherein in the method, a one-step heating method is adopted, the heating rate is 6 ℃/min, the flow rate of the high-purity argon or high-purity nitrogen is 0.5-1L/min, and the organic matters are one of benzene, toluene and acetone;
the iron fiber is prepared by adopting a liquid phase reduction method, and specifically comprises the following steps: preparing soluble ferrous salt and water into a solution with a certain concentration according to a certain stoichiometric ratio, quickly adding sodium borohydride into the solution, and magnetically stirring and reacting at room temperature to 50 ℃ for 30-60 min; then centrifugally washing with water and absolute ethyl alcohol, and finally drying in vacuum at low temperature to obtain the iron fiber with good dispersibility;
the concentration of the soluble ferrite solution is 0.002-0.20 mol. L–1The amount ratio of the soluble ferrite to the sodium borohydride is 1 (1-2); the soluble ferrous salt is one or more of ferrous chloride hexahydrate and ammonium ferrous sulfate.
2. The application of the microwave absorbing diatom ooze coating prepared by the method of claim 1, wherein the microwave absorbing diatom ooze coating is applied in multiple steps, specifically: firstly, scraping bottom layer putty on a cleaned wall surface and grinding the putty, then uniformly dispersing the microwave-absorbing diatom ooze coating on the building wall surface for 2-3 times, then manufacturing a diatom ooze pattern, a coloring or light-collecting layer on the surface of the diatom ooze coating, and curing for 1-2 days to obtain a finished product.
3. The use of the microwave absorbing diatom ooze coating of claim 2, wherein the construction environment requires: the water content of the wall surface bottom layer putty is less than or equal to 10 percent, the temperature of the wall body is between 5 and 40 ℃, the pH value is less than 10, the relative humidity of air is not more than 80 percent, and the direct solarization and the too fast drying of sunlight are avoided in the construction process.
4. The microwave absorbing diatom ooze coating made by the method of claim 1, which is used on building walls with severe electromagnetic pollution in electromagnetically shielded dark rooms, residential distribution rooms, military meeting and security rooms, television towers, broadcasting stations, radar or satellite communication transmitter stations.
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| Porous Fe3O4/Carbon Core/Shell Nanorods:Synthesis and Electromagnetic Properties;Yu-Jin Chen,et al;《The Journal of Physical Chemistry C》;20110623;第115卷(第28期);13603-13608 * |
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