CN103086746B - A kind of preparation method of medium substrate and Meta Materials - Google Patents
A kind of preparation method of medium substrate and Meta Materials Download PDFInfo
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- CN103086746B CN103086746B CN201110336502.8A CN201110336502A CN103086746B CN 103086746 B CN103086746 B CN 103086746B CN 201110336502 A CN201110336502 A CN 201110336502A CN 103086746 B CN103086746 B CN 103086746B
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- barium
- medium substrate
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- strontium titanate
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Abstract
The invention provides a kind of preparation method of medium substrate and apply the Meta Materials of this medium substrate, by the preparation method of medium substrate of the present invention, the barium-strontium titanate ceramic substrate that can obtain having vesicular structure is matrix, the medium substrate of aerosil is filled with in its vesicular structure, in this medium substrate, aerosil has very low specific inductivity, can close to the specific inductivity of air, barium-strontium titanate ceramic then has high specific inductivity, the present invention is by the control to barium-strontium titanate ceramic substrate porosity, control the content of aerosil, and then the adjustment realized barium-strontium titanate ceramic substrate dielectric constant, this electromagnetic performance being Meta Materials adapts to some application and provides a kind of new design approach, by controlling the mol ratio of strontium and barium in strontium-barium titanate, the adjustment to barium-strontium titanate ceramic specific inductivity can be realized.
Description
[technical field]
The present invention relates to Meta Materials field, relate to the technology of preparing of Dielectric substrate for metamaterial particularly.
[background technology]
Meta Materials refers to some artificial composite structures with the extraordinary physical properties not available for natural materials or matrix material.By the structurally ordered design on the key physical yardstick of material, the restriction of some apparent natural law can be broken through, thus obtain the meta-materials function exceeding the intrinsic common character of nature.The character of Meta Materials and function mainly come from the structure of its inside but not form their material, and therefore, be design and synthesis Meta Materials, people have carried out a lot of research work.2000, the people such as the Smith of University of California pointed out that the metal wire of periodic arrangement and the composite structure of open loop syntonizer (SRR) can realize DIELECTRIC CONSTANT ε and magnetic permeability μ is negative two negative material simultaneously, also claim LHM.They are again by achieving the two negative material of two dimension at printed circuit board (PCB) (PCB) upper making metal wire and SRR composite structure afterwards.
By medium substrate and array, the multiple man-made microstructure on medium substrate form the basic structure of Meta Materials, the multiple man-made microstructure of array on medium substrate have specific electromagnetic property, electromagnetic response can be produced to electric field or magnetic field, by carrying out to the structure of man-made microstructure and arrangement regulation effective dielectric constant and the equivalent permeability that careful design can control each elementary cell of Meta Materials, thus the electromagnetic property making Meta Materials present various general material not have, if converge, disperse and deviation hertzian wave etc.
Existing Meta Materials man-made microstructure is generally metallic substance, and medium substrate generally adopts organic resin substrate, the specific inductivity size of medium substrate is generally and is uniformly distributed, for some application of Meta Materials, the specific inductivity size of medium substrate is needed to be distribution heterogeneous, and the rule of this non-uniform Distribution needs artificially controlled, and this becomes prior art technical problem urgently to be resolved hurrily.
[summary of the invention]
The invention provides a kind of preparation method of medium substrate and have the Meta Materials of this medium substrate, is non-uniform Distribution to realize the specific inductivity size of Metamaterial dielectric substrate.
The technical scheme that the present invention realizes goal of the invention employing is that a kind of preparation method of medium substrate, comprises the following steps:
A. preparation has the barium-strontium titanate ceramic substrate of vesicular structure;
B. joined in silicon source in the mixed solvent of second alcohol and water, after mixing, adjust ph, obtains silicon dioxide gel, is injected in the vesicular structure of described barium-strontium titanate ceramic substrate before formation gel by described silicon dioxide gel;
C. leave standstill and make the aging formation gel of described silicon dioxide gel, using ethanol or acetone as displacer, remove the water in described gel;
D. ethanol or acetone are carried out drying, make described gel formation cellular silica aerogel, obtain being filled with the medium substrate of cellular silica aerogel with described barium-strontium titanate ceramic substrate for matrix.
The concrete preparation method of described step a is as follows:
A1, by for the preparation of the organic or inorganic barium source of strontium-barium titanate, organic or inorganic strontium source, organic or inorganic titanium source according to Ba
(1-x)sr
xtiO
3stoichiometric ratio mixing, wherein x is any real number between 0-1;
A2, in said mixture, add binding agent and pore-forming material, adopt the method for flow casting molding to obtain ceramic green;
A3, described ceramic green to be sintered with the high temperature of 1200-1500 DEG C in reducing atmosphere, obtain the barium-strontium titanate ceramic substrate with vesicular structure.
Particularly, by controlling the content of described pore-forming material, described barium-strontium titanate ceramic substrate being formed there is different porositys.
Particularly, described pore-forming material is the 10-50% of described volume of mixture ratio.
Particularly, described pore-forming material is starch or carbon dust.
Particularly, described barium source is barium carbonate, and described strontium source is Strontium carbonate powder, described titanium source is titanium dioxide.
Particularly, described binding agent is polyvinyl butyral acetal.
Particularly, the mixed-gas atmosphere of described reducing atmosphere to be air or volume fraction be 5% hydrogen and 95% nitrogen.
Particularly, in described mixture, be also added with softening agent and dispersion agent, described softening agent and dispersion agent with ethanol or toluene for solvent.
Particularly, described softening agent is polyvinyl alcohol, and described dispersion agent is phosphoric acid ester.
Particularly, in described step b, also add in described mixed sols agent and have drying control agent, described drying control agent is methane amide and ethylene glycol.
Particularly, described silicon source is tetraethoxy, methyl silicate, silicon sol or water glass.
Particularly, in described b step, adjust ph is 2-4 or 11-13.
Particularly, in described b step, also add titanium dioxide powder or glass fibre in described mixed solvent as additive.
The present invention also provides a kind of Meta Materials, comprise medium substrate and the multiple man-made microstructure of array on medium substrate, described medium substrate with barium-strontium titanate ceramic substrate for matrix, described barium-strontium titanate ceramic substrate has vesicular structure, in described vesicular structure, is filled with aerosil.
The invention has the beneficial effects as follows:
1, by the preparation method of medium substrate of the present invention, the barium-strontium titanate ceramic substrate that can obtain having vesicular structure is matrix, the medium substrate of aerosil is filled with in its vesicular structure, in this medium substrate, aerosil has very low specific inductivity, can close to the specific inductivity of air, barium-strontium titanate ceramic then has high specific inductivity, the present invention is by the control to barium-strontium titanate ceramic substrate porosity, control the content of aerosil, and then the adjustment realized barium-strontium titanate ceramic substrate dielectric constant, this electromagnetic performance being Meta Materials adapts to some application and provides a kind of new design approach,
2, by controlling the mol ratio of strontium and barium in strontium-barium titanate, the adjustment to barium-strontium titanate ceramic specific inductivity can be realized.
[accompanying drawing explanation]
Fig. 1, the two dimensional structure schematic diagram of embodiment 1 Meta Materials.
Fig. 2, the cross-sectional view of embodiment 1 Meta Materials.
Fig. 3, the two dimensional structure schematic diagram of embodiment 2 Meta Materials.
Fig. 4, the cross-sectional view of embodiment 2 Meta Materials.
[embodiment]
Below in conjunction with drawings and Examples, the present invention is described in detail.
Embodiment 1
A preparation method for medium substrate, comprises the following steps:
A. prepare barium-strontium titanate ceramic substrate, using barium carbonate as barium source, Strontium carbonate powder as strontium source, titanium dioxide is titanium source, according to Ba
0.2sr
0.8tiO
3stoichiometric ratio mixing, after ball milling drying, obtain mixture, with polyvinyl butyral acetal (PVB) for binding agent, add starch again as pore-forming material, the add-on of pore-forming material is 10% of mixture cumulative volume, obtains ceramic green by the method for flow casting molding, at 1200-1500 DEG C, at 5%H
2sinter 4-20 hour under atmosphere, at high temperature, starch is burnt volatilization, and obtaining after shaping has the strontium-barium titanate (Ba of vesicular structure
0.2sr
0.8tiO
3) ceramic substrate;
B. be silicon source with tetraethoxy, get tetraethoxy 104 grams, 31.5 grams, water, ethanol 92-460 gram mixes, mol ratio is equivalent to tetraethoxy: water: ethanol is 1: 3.5: 4-20, and dropwise add the ammoniacal liquor that concentration is 0.35mol/L, adjust ph is to 2.5-3.5, obtain silicon dioxide gel, before formation gel, silicon dioxide gel is injected in the vesicular structure of barium-strontium titanate ceramic substrate;
C. leave standstill 30 days, make the aging formation gel of silicon dioxide gel, using ethanol or acetone as displacer, remove the water in gel;
D. ethanol or acetone are carried out normal temperature and pressure drying, make gel formation aerosil, obtain being filled with the medium substrate of aerosil with barium-strontium titanate ceramic substrate for matrix.
Above-mentioned obtained medium substrate covers copper, on medium substrate, artificial metal's copper microstructure with definite shape and arrangement rule is produced by the method for etching or laser sculpture, obtain Meta Materials, the medium substrate 1 of the Meta Materials that the present embodiment obtains is gone into battle and is shown I shape man-made microstructure 2, medium substrate 1 with barium-strontium titanate ceramic substrate 11 for matrix, vesicular structure is distributed with in barium-strontium titanate ceramic substrate 11, aerosil 12 is filled with in vesicular structure, the two dimensional structure schematic diagram of Meta Materials is referring to accompanying drawing 1, the cross-sectional view of Meta Materials is referring to accompanying drawing 2.
Embodiment 2
A preparation method for medium substrate, comprises the following steps:
A. prepare barium-strontium titanate ceramic substrate, using barium carbonate as barium source, Strontium carbonate powder as strontium source, titanium dioxide is titanium source, according to Ba
0.5sr
0.5tiO
3stoichiometric ratio mixing, after ball milling drying, obtain mixture, with polyvinyl butyral acetal (PVB) for binding agent, then add the carbon dust of volume of mixture than 50% as pore-forming material, in mixture, be also added with softening agent polyvinyl alcohol and dispersion agent phosphoric acid ester, polyvinyl alcohol and phosphoric acid ester with ethanol or toluene for solvent, then ceramic green is obtained by the method for flow casting molding, at 1200-1500 DEG C, at 5%H
2sinter 4-20 hour under atmosphere, at high temperature, carbon dust is burnt rear volatilization, and obtaining after shaping has the strontium-barium titanate (Ba of vesicular structure
0.5sr
0.5tiO
3) ceramic substrate;
B. by methyl silicate: water: ethanol: HCl is by 1: 3.5: 8: 8.4 × 10
-4mixed in molar ratio obtain mixing solutions, add appropriate titanium dioxide powder or glass fibre as additive, for improving void content, also can add methane amide or ethylene glycol as drying control agent, 60 DEG C of waters bath with thermostatic control are incubated 2 hours, and instillation massfraction is the hydrochloric acid of 1.5%, and adjust ph is to 11-12, obtain silicon dioxide gel, before formation gel, silicon dioxide gel is injected in the vesicular structure of barium-strontium titanate ceramic substrate;
C. leave standstill 30 days, make the aging formation gel of silicon dioxide gel, using ethanol or acetone as displacer, remove the water in gel;
D. ethanol or acetone are carried out normal temperature and pressure drying, make gel formation aerosil, obtain being filled with the medium substrate of aerosil with barium-strontium titanate ceramic substrate for matrix.
Above-mentioned obtained medium substrate covers copper, on medium substrate, artificial metal's copper microstructure with definite shape and arrangement rule is produced by the method for etching or laser sculpture, obtain Meta Materials, the medium substrate 1 of the Meta Materials that the present embodiment obtains is gone into battle and is shown the ring-like man-made microstructure 2 of opening, medium substrate 1 with barium-strontium titanate ceramic substrate 11 for matrix, aerosil 12 is filled with in the vesicular structure of barium-strontium titanate ceramic substrate 11, the two dimensional structure schematic diagram of Meta Materials is referring to accompanying drawing 3, and the cross-sectional view of Meta Materials is referring to accompanying drawing 4.
Comparison diagram 2 and Fig. 4, can find out, because the addition of pore-forming material is different, the porosity formed in medium substrate is also different, pore-forming material addition is few, the porosity formed is also little, pore-forming material addition is large, the porosity formed is large, the difference of porosity causes the content of the aerosil in vesicular structure also different, in whole medium substrate, the content of aerosil is different and then can affect the size of medium substrate overall dielectric constant, therefore, according to the requirement of medium substrate to specific inductivity, can be controlled by the addition of pore-forming material.
Application the present invention, can obtain being filled with the medium substrate of aerosil with barium-strontium titanate ceramic substrate for matrix, in this medium substrate, aerosil is owing to having lower specific inductivity, can close to the specific inductivity of air, barium-strontium titanate ceramic then has high specific inductivity, and this makes the specific inductivity of medium substrate can be advantageously controlled on the whole, and this is that the electromagnetic performance of Meta Materials adapts to some application and provides a kind of new design approach;
Meanwhile, by controlling the mol ratio of strontium and barium in strontium-barium titanate, the adjustment to barium-strontium titanate ceramic specific inductivity can also be realized.
In the above-described embodiments, only to invention has been exemplary description, but those skilled in the art can carry out various amendment to the present invention without departing from the spirit and scope of the present invention after reading present patent application.
Claims (13)
1. a preparation method for medium substrate, is characterized in that, comprises the following steps:
A. by for the preparation of the organic or inorganic barium source of strontium-barium titanate, organic or inorganic strontium source, organic or inorganic titanium source according to Ba
(1-x)sr
xtiO
3stoichiometric ratio mixing; In said mixture, add binding agent and pore-forming material, adopt the method for flow casting molding to obtain ceramic green; Described ceramic green is sintered with the high temperature of 1200-1500 DEG C in reducing atmosphere, obtains the barium-strontium titanate ceramic substrate with vesicular structure; Wherein, x is any real number between 0-1; Pore-forming material is the 10-50% of described volume of mixture ratio;
B. joined in silicon source in the mixed solvent of second alcohol and water, after mixing, adjust ph, obtains silicon dioxide gel, is injected in the vesicular structure of described barium-strontium titanate ceramic substrate before formation gel by described silicon dioxide gel;
C. leave standstill and make the aging formation gel of described silicon dioxide gel, using ethanol or acetone as displacer, remove the water in described gel;
D. ethanol or acetone are carried out drying, make described gel formation cellular silica aerogel, obtain being filled with the medium substrate of cellular silica aerogel with described barium-strontium titanate ceramic substrate for matrix.
2. the preparation method of medium substrate according to claim 1, is characterized in that, by controlling the content of described pore-forming material, described barium-strontium titanate ceramic substrate being formed and has different porositys.
3. the preparation method of medium substrate according to claim 1, is characterized in that, described pore-forming material is starch or carbon dust.
4. the preparation method of medium substrate according to claim 1, is characterized in that, described barium source is barium carbonate, and described strontium source is Strontium carbonate powder, described titanium source is titanium dioxide.
5. the preparation method of medium substrate according to claim 1, is characterized in that, described binding agent is polyvinyl butyral acetal.
6. the preparation method of medium substrate according to claim 1, is characterized in that, the mixed-gas atmosphere of described reducing atmosphere to be volume fraction be 5% hydrogen and 95% nitrogen.
7. the preparation method of medium substrate according to claim 1, is characterized in that, is also added with softening agent and dispersion agent in described mixture, described softening agent and dispersion agent with ethanol or toluene for solvent.
8. the preparation method of medium substrate according to claim 7, is characterized in that, described softening agent is polyvinyl alcohol, and described dispersion agent is phosphoric acid ester.
9. the preparation method of medium substrate according to claim 1, is characterized in that, in described step b, also add and have drying control agent in described mixed solvent, described drying control agent is methane amide and ethylene glycol.
10. the preparation method of medium substrate according to claim 1, is characterized in that, described silicon source is tetraethoxy, methyl silicate, silicon sol or water glass.
The preparation method of 11. medium substrates according to claim 1, is characterized in that, in described b step, adjust ph is 2-4 or 11-13.
The preparation method of 12. medium substrates according to claim 1, is characterized in that, in described b step, also adds titanium dioxide powder or glass fibre as additive in described mixed solvent.
13. 1 kinds of Meta Materials, comprise medium substrate and the multiple man-made microstructure of array on medium substrate prepared by the preparation method as described in claim 1 to 12 any one, it is characterized in that: described medium substrate with barium-strontium titanate ceramic substrate for matrix, described barium-strontium titanate ceramic substrate has vesicular structure, in described vesicular structure, is filled with aerosil.
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