CN106241886B - A kind of Electromagnetic enhancement carbon magnetic composite and preparation method and application - Google Patents
A kind of Electromagnetic enhancement carbon magnetic composite and preparation method and application Download PDFInfo
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- C01G49/00—Compounds of iron
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Abstract
The present invention is a kind of Electromagnetic enhancement carbon magnetic composite and preparation method and application.The component of the composite is expanded graphite and spinel structure Fe3O4, carbon iron atom ratio is 22.58~95.15.The preparation of the composite includes the preparation of expanded graphite, the preparation of expanded graphite/glycolic iron nanometer sheet compound and expanded graphite/Fe3O4The preparation of nano-rings compound.The mentality of designing of material of the present invention is novel, electromagnetic parameter enhancing is notable, and gained carbon magnetic material will have broad application prospects in fields such as shielding, microwave absorption, electrode material, the removal of DBPs, Magnetic Sensor, detection, bio-separation or medical imagings；The inventive method formation mechenism is novel, process is simple, composition is easily controllable.
Description
Technical field
The present invention relates to electromagnetic functional material field, and in particular to a kind of design of Electromagnetic enhancement carbon magnetic composite, system
Standby and application method.
Background technology
It is to solve having for current microwave electromagnetic pollution problem to design and prepare new and effective electromagnetic wave shielding and absorbing material
Effect approach.The microwave absorbing material of excellent performance must meet impedance matching condition (i.e. μ '~ε ') and strong electromagnetic wave absorb (or
Decay) characteristic (i.e. high tg δE, tg δM).At present, compound and its composition, pattern, the knot of different loss-type microwave wave absorbing agents are passed through
Structure, size, distribution, surface and the regulation and control at interface can be in a wide range of interior regulation dielectric constants.Due to the limitation of the Snoek limit, greatly
It is still a world-famous puzzle that amplitude, which improves magnetic conductivity,.The research of forefathers shows there is the material of in-plane anisotropy in high frequency
Under have higher magnetic conductivity and natural resonant frequency, the limitation of the Snoek limit can be broken through.Such as, Co2Z-type plane hexad ferrite
There is the Snoek limiting value bigger than common block materials because the anisotropy in its c-axis direction is more than intra-face anisotropy
[J.Appl.Phys.,1988,64(10),6047-6049].The anisotropic film of in-plane mono-axial has higher Snoek poles
Limit value [J.Appl.Phys., 1997,81 (8), 5166-5168；J.Magn.Magn.Mater.,2003,258,195-197].
According to double anisotropic models：(Ha1And Ha2Illustrate the effective anisotropy in two vertical planes
).When system has two kinds of either further types of anisotropy or when there is the anisotropy of easy magnetization noodles type,
When this anisotropy is much larger than anisotropy field inside easy magnetization face, higher Snoek limiting values will be obtained.Current
The synthetic method of material is difficult to prepare high double anisotropic materials, and which has limited the raising of magnetic conductivity.
In the present invention, the expanded graphite and Fe of our high conductivity3O4Nano-rings are compound, by controlling Fe3O4Nano-rings
Content can in a wide range of regulation and control dielectric constant and magnetic conductivity.These materials shielding, microwave absorption, magnetic recording material,
The fields such as logical device, Magnetic Sensor, detection, bio-separation, medical imaging and targeted drug have broad application prospects.
The content of the invention
The present invention is intended to provide a kind of electromagnetic parameter enhancing, the particularly new mentality of designing of magnetic conductivity enhancing and electromagnetism increase
The preparation method of strong carbon magnetic composite.The mentality of designing of material is novel, preparation technology is simple, easily controllable.Obtained by this method
Expanded graphite/Fe3O4Nano-rings compound has significant electromagnetic parameter enhancement effect, and can be by regulating and controlling to expand stone
The electrical conductivity of ink, Fe3O4Nanometer ring content controls electromagnetic parameter.
The present invention solves its technical problem and uses following technical scheme：
Electromagnetic enhancement carbon magnetic composite provided by the invention, its component are expanded graphite and spinel structure Fe3O4, carbon
Iron atom ratio is 22.58~95.15.
Described expanded graphite is vermiform multi-layer sheet structure, a length of 120~850 μm, a width of 60~260 μm, resistivity
For 0.08~1.30m Ω cm.
Described Fe3O4For polycrystalline Nano ring, a length of 60 ± 20~200 ± 20nm of its major axis, major axis and short axle ratio are 1.2
~1.7, ring thickness is 10~25nm；
Described Electromagnetic enhancement carbon magnetic composite, its saturation magnetization range are 7.12~23.61emug–1。
In 2~18GHz frequency ranges, the real part of permittivity and imaginary part of the Electromagnetic enhancement carbon magnetic composite relative to
Expanded graphite increases by 0.1~70 and 0.1~450 times respectively, the magnetic conductivity real and imaginary parts of the Electromagnetic enhancement carbon magnetic composite
Relative to Fe3O4Nano-rings increase by 0.8~4.5 and 0.5~136 times respectively.
Above-mentioned Electromagnetic enhancement carbon magnetic composite provided by the invention, its preparation method comprise the steps：
(1) preparation of expanded graphite：
Expanded graphite is prepared using ball milling-thermal expansion technique：First by expansible graphite 0~5h of ball milling, then 500~
800 DEG C of 15~60min of expansion, obtain expanded graphite；
(2) preparation of expanded graphite/glycolic iron nanometer sheet compound：
Expanded graphite/glycolic iron nanometer sheet compound is prepared using absorption method, is specifically：First by surfactant 0.5
12h is stirred at room temperature in~2.0g, expanded graphite 0.5g, water 100mL and glycolic iron nanometer sheet, then filters separation, obtains
Required expanded graphite/glycolic iron nanometer sheet compound；Glycolic iron nanometer sheet and the mass ratio of expanded graphite be 0.2~
0.8；
(3) expanded graphite/Fe3O4The preparation of nano-rings compound：
Expanded graphite/Fe is prepared using sintering process3O4Nano-rings compound, it is specifically：First loaded and expanded with ceramic Noah's ark
Graphite/glycolic iron nanometer sheet compound, then Noah's ark is placed in single warm tube furnace, under nitrogen or argon, in 300
By 1~2h of carbothermic reduction reaction at~500 DEG C, furnace cooling to room temperature, expanded graphite/Fe is finally obtained3O4Nano-rings are compound
Thing, it is described Electromagnetic enhancement carbon magnetic composite.
In the above method, described surfactant is PVP (PVP), CTAB (cetyl front threes
Base ammonium bromide).
Electromagnetic enhancement carbon magnetic composite provided by the invention, its shielding, microwave absorption, DBPs removal,
Application in magnetic recording material, logical device, Magnetic Sensor, detection, bio-separation, medical imaging or targeted drug field.
Electromagnetic enhancement carbon magnetic composite provided by the invention, it has significant microwave electromagnetic enhancement effect, the effect
It is the double anisotropy and spinel structure Fe by the ultra-thin carbon-coating of expanded graphite3O4Plasma resonance enhancing synergy
Lower realization.
The present invention utilizes the double anisotropy and Fe of the ultra-thin carbon-coating of expanded graphite3O4The plasma resonance enhancing effect of nano-rings
Dielectric constant and magnetic conductivity should be improved.
Expanded graphite and Fe of the present invention as a result of high conductivity3O4Nano-rings are compound to prepare high Electromagnetic enhancement function
Material, with existing Co2Z-type plane hexad ferrite is compared with thin-film material, is had the following advantages that and good effect：
(1) preparation process is simple, formation mechenism is novel；
(2) electromagnetic parameter enhancing is notable, and Electromagnetic enhancement mechanism is novel；
(3) carbon magnetic compound composition is easy to regulate and control, and electromagnetic parameter is adjustable；
(4) raw material is cheap and easy to get, and preparation cost is low, efficiency high, is easy to commercial Application popularization.
Brief description of the drawings
Fig. 1 is the XRD phase structure collection of illustrative plates of embodiment 1-3.
Fig. 2-3 be embodiment 1 observed under scanning nuclear microprobe pattern, structure.
Fig. 4 is embodiment 1,4-6 elementary analysis energy spectrum diagram.
Fig. 5 is embodiment 1,4-6 electrostatic theory curve.
Fig. 6-7 is embodiment 1,4-6 electromagnetic parameter figure.
Fig. 8 is the XRD phase structure collection of illustrative plates of embodiment 2-3.
Fig. 9-10 is the electromagnetic parameter figure of embodiment 2-3.
Figure 11-13 is the pattern observed under ESEM of the products therefrom of embodiment 4-6 respectively.
Figure 14-17 is the electromagnetic parameter figure of embodiment 7-10.
Figure 18 is the dielectric constant figure of embodiment 11-13.
Figure 19 is the electromagnetic parameter figure of embodiment 14.
Figure 20 is the electromagnetic parameter figure of embodiment 15.
Figure 21 is the electromagnetic parameter figure of embodiment 16.
Embodiment
For a better understanding of the present invention, with reference to embodiment and the accompanying drawing content that the present invention is furture elucidated, but this
The content of invention is not limited solely to the following examples.
Embodiment 1：
First 700 DEG C are expanded obtained expanded graphite (500mg), PVP (2g), water (150mL) to be added in 250mL beakers
Stir 12h, the expanded graphite being modified, then by the expanded graphite being modified and glycolic iron nanometer sheet (200mg), water
(100mL) mixes 2h in beaker.Products therefrom after suction filtration is dried into 5h in 60 DEG C of vacuum drying chambers, finally sample existed
N2Lower 400 DEG C of sintering 2h is protected, obtains Electromagnetic enhancement carbon magnetic composite.
Gained Electromagnetic enhancement carbon magnetic composite, its thing phase, the pattern observed under ESEM and transmission electron microscope and
Structure is distinguished as shown in Figures 1 to 3, product Fe3O4With the compound of expanded graphite, expanded graphite grow 120~850 μm, a width of 60
~260 μm, it is uniformly dispersed with oval Fe3O4Nano-rings, its long 145 ± 20nm of axial length；Its major axis and short axle ratio are
1.2~1.7；Ring major axis boss ratio is 0.3~0.7.
Gained Electromagnetic enhancement carbon magnetic composite, as shown in figure 4, carbon iron atom ratio is 38.84, resistivity is its power spectrum
0.18mΩ·cm；Its electrostatic theory is as shown in figure 5, saturation magnetization is 15.07emug-1, coercivity 28.82Oe；Its
Electromagnetic parameter as shown in figs. 6-7, relative to expanded graphite distinguish in 2~18GHz frequency ranges by real part of permittivity and imaginary part
7~45 and 5~327 times of increase, its magnetic conductivity real and imaginary parts is relative to Fe3O4Nano-rings increase by 4~4.5 and 6.5~28 respectively
Times.
Embodiment 2：
It is identical with the step of embodiment 1, but calcining heat is 300 DEG C.Gained Electromagnetic enhancement carbon magnetic composite, its thing phase is such as
Shown in Fig. 1, product Fe3O4With the compound of expanded graphite；Its electrostatic theory is as shown in figure 8, saturation magnetization is
12.01emu·g-1, coercivity 40.57Oe；Its electromagnetic parameter is as shown in Fig. 9~10, the dielectric in 2~18GHz frequency ranges
Constant real and imaginary parts increase by 0.5~22 and 6.5~90 times relative to expanded graphite respectively, and its magnetic conductivity real and imaginary parts is relative
In Fe3O4Nano-rings increase by 3~4 and 2.5~19.5 times respectively.
Embodiment 3：
It is identical with the step of embodiment 1, but calcining heat is 500 DEG C.Gained Electromagnetic enhancement carbon magnetic composite, its thing phase is such as
Shown in Fig. 1, product Fe3O4With the compound of expanded graphite.Its electrostatic theory is as shown in figure 8, saturation magnetization is
10.88emu·g-1, coercivity 63.57Oe；Its electromagnetic parameter is as shown in Fig. 9~10, the dielectric in 2~18GHz frequency ranges
Constant real and imaginary parts increase by 0.5~7 and 4.5~160 times relative to expanded graphite respectively, and its magnetic conductivity real and imaginary parts is relative
In Fe3O4Nano-rings increase by 2~2.5 and 3~7.5 times respectively.
Embodiment 4：
It is identical with the step of embodiment 1, but the quality for adding glycolic ferrisodium rice piece is 100mg.Gained Electromagnetic enhancement carbon magnetic
Composite, the pattern that it is observed under ESEM are as shown in figure 11, it is seen that glycolic ferrisodium rice piece is in expanded graphite table
The distribution density in face is smaller than embodiment 1；Its power spectrum is as shown in figure 4, carbon iron atom ratio is 95.15；Its electrostatic theory such as Fig. 5 institutes
Show, saturation magnetization 7.12emug-1, coercivity 15.44Oe；Its electromagnetic parameter as shown in figs. 6-7,2~
Real part of permittivity and imaginary part increase by 3~24 and 4~205 times relative to expanded graphite respectively in 18GHz frequency ranges, its magnetic conductance
Rate real and imaginary parts are relative to Fe3O4Nano-rings increase by 1.8~2 and 10~12.5 times respectively.
Embodiment 5：
It is identical with the step of embodiment 1, but the quality for adding glycolic ferrisodium rice piece is 400mg, surfactant CTAB.
Gained Electromagnetic enhancement carbon magnetic composite, the pattern that it is observed under ESEM are as shown in figure 12, it is seen that glycolic ferrisodium
Distribution density of the rice piece on expanded graphite surface is bigger than embodiment 1；Its power spectrum is as shown in figure 4, carbon iron atom ratio is 22.58；Its
Electrostatic theory is as shown in figure 5, saturation magnetization is 23.61emug-1, coercivity 34.79Oe, its electromagnetic parameter such as Fig. 6
Shown in~7, real part of permittivity and imaginary part increase by 3~68.5 Hes relative to expanded graphite respectively in 2~18GHz frequency ranges
4~330 times, its magnetic conductivity real and imaginary parts is relative to Fe3O4Nano-rings increase by 3~3.5 and 2.5~30 times respectively.
Embodiment 6：
It is identical with the step of embodiment 1, but the quality for adding glycolic ferrisodium rice piece is 600mg.Gained Electromagnetic enhancement carbon magnetic
Composite, the pattern that it is observed under ESEM is as shown in figure 13, and glycolic ferrisodium rice piece is on expanded graphite surface
Distribution density is bigger than embodiment 1；Its power spectrum is as shown in figure 4, carbon iron atom ratio is 15.10；Its electrostatic theory is as shown in figure 5, full
It is 34.63emug with the intensity of magnetization-1, coercivity 44.53Oe；Its electromagnetic parameter as shown in figs. 6-7,2~18GHz frequency
Real part of permittivity and imaginary part increase by 0.6~18 and 0.2~26 times relative to expanded graphite respectively in the range of rate, and its magnetic conductivity is real
Portion and imaginary part are relative to Fe3O4Nano-rings increase by 1~1.1 and 1.3~2 times respectively.
Embodiment 7：
It is identical with the step of embodiment 1, but expanded graphite has ground 5h before high-temperature expansion with ball mill.Gained Electromagnetic enhancement
Carbon magnetic composite, its resistivity are 2.10m Ω cm；Its electromagnetic parameter is as shown in Figure 14~15, in 2~18GHz frequency models
Enclose interior real part of permittivity and imaginary part increases by 0.5~20 and 0.5~7.5 times relative to expanded graphite respectively, its magnetic conductivity real part
With imaginary part relative to Fe3O4Nano-rings increase by 0.8~1.2 and 0.7~6 times respectively.
Embodiment 8：
It is identical with the step of embodiment 1, but expanded graphite has ground 10h before high-temperature expansion with ball mill.Gained electromagnetism increases
Strong carbon magnetic composite, its resistivity is 40.70m Ω cm；Its electromagnetic parameter is as shown in Figure 14~15, in 2~18GHz frequencies
In the range of real part of permittivity and imaginary part increase by 0.1~3.5 and 0.1~4 times respectively relative to expanded graphite, its magnetic conductivity real part
With imaginary part relative to Fe3O4Nano-rings increase by 1~1.1 and 0.5~1.5 times respectively.
Embodiment 9：
It is identical with the step of embodiment 1, but expanded graphite high-temperature expansion at 500 DEG C obtains.Gained Electromagnetic enhancement carbon
Magnetic composite, its electromagnetic parameter is as shown in Figure 16~17, real part of permittivity and imaginary part phase in 2~18GHz frequency ranges
Increase by 0.5~46 and 3~450 times respectively for expanded graphite, its magnetic conductivity real and imaginary parts is relative to Fe3O4Nano-rings are distinguished
1~2.5 and 5.5~80 times of increase.
Embodiment 10：
It is identical with the step of embodiment 1, but expanded graphite high-temperature expansion at 800 DEG C obtains.Gained Electromagnetic enhancement carbon
Magnetic composite, its electromagnetic parameter is as shown in Figure 16~17, real part of permittivity and imaginary part phase in 2~18GHz frequency ranges
Increase by 1.5~70 and 2.5~275 times respectively for expanded graphite, its magnetic conductivity real and imaginary parts is relative to Fe3O4Nano-rings point
Zeng Jia not be 2.5~3.5 and 3~136 times.
Embodiment 11：
Muffle furnace is first risen to 400 DEG C, then loads 100g expansible graphites with aluminum alloy container and is quickly put into Muffle
Taken out after being incubated 60min in stove, obtain required expanded graphite.Its resistivity is 5.80m Ω cm.Electromagnetic parameter such as Figure 18 institutes
Show.
Embodiment 12：
It is identical with the step of embodiment 11, but graphite expansion temperature is 500 DEG C, Bulking Time 30min.Gained expanded graphite,
Its resistivity is 1.2m Ω cm；Its electromagnetic parameter is as shown in figure 18.
Embodiment 13：
It is identical with the step of embodiment 12, but graphite expansion temperature is 800 DEG C, Bulking Time 15min.Gained expanded graphite,
Its resistivity is 1.30m Ω cm；Its electromagnetic parameter is as shown in figure 18.
Embodiment 14：
First by FeCl3·6H2O (5mmol), ethylene glycol (40mL) and polyethylene glycol 2000 (0.5g) are added to polytetrafluoroethyl-ne
In alkene liner, magnetic agitation 30min.Ethylenediamine (10mmol) (the ratio between amount of alkali and metal salt material is 2) is added to again interior
2.0h is mixed in lining.Finally liner is put into stainless steel kettle and reacts 6h, centrifuge washing after cooling at 200 DEG C.60 DEG C dry
Dry 6h obtains required single dispersing glycolic iron nanometer sheet.By it, 400 DEG C are burnt 2h under nitrogen protection, obtain Fe3O4Nano-rings.Body
Fraction is 20% Fe3O4The electromagnetic parameter of nano-rings is as shown in figure 19, the Fe in 2~18GHz frequency ranges3O4Nano-rings
Real part of permittivity and imaginary part be respectively 4.8~6.4 and 1.1~1.6, the real and imaginary parts of its magnetic conductivity are respectively 1.0~
1.05 and -0.1~0.1.This is significantly lower than expanded graphite/Fe3O4Nanometer ring carbon magnetic compound (see embodiment 1).
Embodiment 15：
700 DEG C are expanded obtained expanded graphite (500mg), PVP (2g), water (150mL) to be first added in 250mL beakers
12h is stirred, then by the expanded graphite being modified, FeSO4·7H2O(0.001mol)、Fe(NO3)3·9H2O (0.001mol), water
(150mL) mixes 20min in beaker.NaOH solution (0.002mol), water-bath are added dropwise after water-bath is warming up into 70 DEG C
React 10min.Wash, filter after cooling, products therefrom dries 5h in 60 DEG C of vacuum drying chambers.Finally by sample in N2Under protection
400 DEG C of sintering 2h, obtain expanded graphite/Fe3O4Nano-particle carbon magnetic compound.The electromagnetic parameter that volume fraction is 20% is as schemed
Shown in 20, expanded graphite/Fe in 2~18GHz frequency ranges3O4The real part of permittivity and void of nano-particle carbon magnetic compound
Portion is respectively 24.5~55 and 46.5~83.5, and the real and imaginary parts of its magnetic conductivity are respectively 1.01~1.05 and 0.14~1.3.
This is also significantly lower than expanded graphite/Fe3O4Nanometer ring carbon magnetic compound (see embodiment 1).
Embodiment 16：
It is identical with the step of embodiment 1, but the size for adding glycolic ferrisodium rice piece is 60 ± 20nm.Gained Electromagnetic enhancement carbon
Magnetic composite, its electromagnetic parameter is as shown in figure 21, in 2~18GHz frequency ranges real part of permittivity and imaginary part relative to
Expanded graphite increases by 0.5~23.7 and 0.4~145 times respectively, and its magnetic conductivity real and imaginary parts is relative to Fe3O4Nano-rings are distinguished
0.9~1 and 2.4~12 times of increase.
Electrical conductivity is measured using RTS-8 types four-point probe.Electrostatic theory is using the production of LakeShore companies of the U.S.
7404 type vibrating specimen magnetometers measure.Formed with the element of EX-250 power spectrum survey meter quantitative analysis carbon magnetic nano-rings.Microwave
Electromagnetic property is tested using Agilent 5230A network vectors analyzer, then with formula RL(dB)=20log | (Zin-Z0)/(Zin+
Z0) | andCalculate microwave reflection rate (Z in formulainAnd Z0Respectively absorbing material and freedom
Space impedance, μ and ε are respectively magnetic conductivity and dielectric constant, and f is frequency, and d is coating layer thickness, and c is the light velocity), and with following formula
Calculate microwave reflection rate：
In above-described embodiment, used glycolic iron nanometer sheet can use Chinese patent literature 201510175533.8
It is prepared by the method for announcement.
Claims (7)
1. a kind of Electromagnetic enhancement carbon magnetic composite, it is characterised in that its component is expanded graphite and spinel structure Fe3O4, carbon
Iron atom ratio is 22.58 ~ 95.15；Described expanded graphite is vermiform multi-layer sheet structure, a length of 120 ~ 850 μm, wide
For 60 ~ 260 μm, resistivity is 0.08 ~ 1.30 m Ω cm；Described Fe3O4For polycrystalline Nano ring, its major axis a length of 60
The nm of ± 20 nm ~ 200 ± 20, major axis and short axle ratio are 1.2 ~ 1.7, and ring thickness is 10 ~ 25 nm.
2. Electromagnetic enhancement carbon magnetic composite as claimed in claim 1, it is characterised in that the saturation magnetic of the carbon magnetic composite
Change strength range is 7.12 ~ 23.61 emug–1。
3. Electromagnetic enhancement carbon magnetic composite as claimed in claim 1, it is characterized in that in 2 ~ 18 gigahertz frequency ranges,
The real part of permittivity and imaginary part of the carbon magnetic composite increase by 0.1 ~ 70 and 0.1 ~ 450 respectively relative to expanded graphite
Times, the magnetic conductivity real and imaginary parts of the carbon magnetic composite are relative to Fe3O4Nano-rings increase by 0.8 ~ 4.5 and 0.5 respectively ~
136 times.
A kind of 4. preparation method of Electromagnetic enhancement carbon magnetic composite, it is characterized in that preparing claims 1 to 3 using following methods
In any described Electromagnetic enhancement carbon magnetic composite, this method comprises the steps：
（1）The preparation of expanded graphite：
Expanded graphite is prepared using ball milling-thermal expansion technique：First by the h of expansible graphite ball milling 0 ~ 5, then 500 ~ 800
15 ~ 60 min are expanded at DEG C, obtain expanded graphite；
（2）The preparation of expanded graphite/glycolic iron nanometer sheet compound：
Expanded graphite/glycolic iron nanometer sheet compound is prepared using absorption method, is specifically：First by surfactant 0.5 ~
12 h are stirred at room temperature in 2.0 g, the g of expanded graphite 0.5, the mL of water 100 and glycolic iron nanometer sheet, then filter separation, obtain
To required expanded graphite/glycolic iron nanometer sheet compound；Glycolic iron nanometer sheet and the mass ratio of expanded graphite be 0.2 ~
0.8；
（3）Expanded graphite/Fe3O4The preparation of nano-rings compound：
Expanded graphite/Fe is prepared using sintering process3O4Nano-rings compound, it is specifically：First expansion stone is loaded with ceramic Noah's ark
Ink/glycolic iron nanometer sheet compound, then Noah's ark is placed in single warm tube furnace, under nitrogen or argon, in 300 ~
By the h of carbothermic reduction reaction 1 ~ 2 at 500 DEG C, furnace cooling to room temperature, expanded graphite/Fe is finally obtained3O4Nano-rings are answered
Compound, it is described Electromagnetic enhancement carbon magnetic composite.
5. the preparation method of Electromagnetic enhancement carbon magnetic composite as claimed in claim 4, it is characterised in that live on described surface
Property agent is PVP or CTAB.
6. the application of any Electromagnetic enhancement carbon magnetic composite in claims 1 to 3, it is characterized in that the material shielding,
Microwave absorption, the removal of DBPs, magnetic recording material, logical device, Magnetic Sensor, detection, bio-separation, medical imaging
Or the application in targeted drug field.
7. application according to claim 6, it is characterized in that the material has significant microwave electromagnetic enhancement effect, the effect
It is the double anisotropy and spinel structure Fe by the ultra-thin carbon-coating of expanded graphite3O4Plasma resonance enhancing synergy
Lower realization.
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| CN108620577B (en) * | 2018-04-11 | 2020-08-07 | 浙江师范大学 | Plasma resonance electromagnetic enhancement bimetal-medium heterogeneous material and preparation and application thereof |
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