CN100368924C - Negative magnetic permeability material in aperiodic infrared band - Google Patents
Negative magnetic permeability material in aperiodic infrared band Download PDFInfo
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- CN100368924C CN100368924C CNB2005100427421A CN200510042742A CN100368924C CN 100368924 C CN100368924 C CN 100368924C CN B2005100427421 A CNB2005100427421 A CN B2005100427421A CN 200510042742 A CN200510042742 A CN 200510042742A CN 100368924 C CN100368924 C CN 100368924C
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- negative magnetic
- magnetic permeability
- permeability material
- aperiodic
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Abstract
The present invention relates to a negative magnetic permeability material in an aperiodic branch-shaped infrared wave band. Compared with the original materials, the basic structure units of the negative magnetic permeability material of the present invention are metal copper in a branch-shaped structure, and the metal copper is prepared by adopting a chemical electro deposition method. Electrodes used for preparing the negative magnetic permeability material are annular copper electrodes and carbon fiber electrodes in micron size. The size and the microscopic structure of the prepared negative magnetic permeability material can be controlled by regulating factors in the electro deposition process, such as cathode size, voltage, electro deposition time, electrolyte concentration, etc. Thereby, the present invention has the advantages of controllable preparing process, simplicity, easy operation, wide regulating range, etc. The resonant wavelength of the branch-shaped negative magnetic permeability material shifts to the direction of long wavelength along the progressive increase of fractal dimensions.
Description
Technical field the present invention relates to a kind of negative magnetic-inductive capacity material and technology of preparing thereof, particularly a kind of negative magnetic permeability material in aperiodic infrared band and chemical preparation technology thereof.
Background technology " left-handed materials " is proposed in the sixties in 20th century theoretically by USSR (Union of Soviet Socialist Republics) scientist Veselago the earliest, and his prophesy exists a kind of specific inductive capacity and magnetic permeability to be negative material simultaneously.Though materials such as occurring in nature gold, silver and aluminium have negative specific inductive capacity in optical frequencies and infrared band, but some ferromagnetic and ferrimagnetic material can only present negative magnetic permeability much smaller than optical frequency the time, when frequency just no longer shows magnetic during near infrared band, thereby make the material that utilizes nature to exist realize that specific inductive capacity and magnetic permeability are simultaneously for unlikely negative.Propose to use artificial periodicity split ring resonator structure to realize negative magnetoconductivity up to people such as last century Mo Pendry, just make the research of left-handed materials enter a new great development period.Up to the present, the realization of negative magnetic-inductive capacity material all is to depend on artificial periodicity split ring resonator structure or its to be out of shape and to realize basically, the also methods that adopt physics of the preparation of sample more, the process complexity, involve great expense, and because the limitation of physical method itself makes negative magnetic-inductive capacity material become problem in infrared and realization optical band.If adopt chemical method preparation and the similar aperiodicity resonant structure of split ring resonator structure function, as dendritic structure, realize the effect of LC oscillator, might produce at the infrared and real material of optical frequencies with negative magnetoconductivity characteristic.
Summary of the invention the purpose of this invention is to provide a kind of negative magnetic permeability material in aperiodic infrared band that adopts the chemical method preparation, and its elementary cell is a self similarity dendritic metal structure.
Negative magnetic permeability material in aperiodic infrared band of the present invention prepare the method that adopts chemical electro-deposition, the aperiodicity dendritic structure negative magnetic-inductive capacity material of preparation is a metallic copper.
Negative magnetic permeability material in aperiodic infrared band of the present invention prepare the method that adopts chemical electro-deposition, the aperiodicity dendritic structure negative magnetic-inductive capacity material of preparation is a metallic copper.
In the preparation process of the negative magnetic permeability material in aperiodic infrared band described in the present invention, electrodeposit liquid is CuSO
45H
2O and H
2SO
4Mixed solution, used anode is the annular copper electrode, used negative electrode is the carbon fiber electrode of diameter 5 μ m.In the chemical electro-deposition process, adopt and regulate concentration of electrolyte, the voltage method in negative electrode diameter and the electrodeposition process can be prepared the dendritic metal steel structure with different size and fractal dimension.Use D.C. regulated power supply in the electrodeposition process.
Negative magnetic-inductive capacity material related among the present invention can be selected control to its resonance wavelength by the fractal dimension of the resulting dendritic structure copper of control electro-deposition.
Description of drawings
Fig. 1 electric deposition device synoptic diagram.
Fig. 2 dendritic structure negative magnetic-inductive capacity material digital photograph and infrared test synoptic diagram.
The infrared transmission spectral line of the single dendritic structure of Fig. 3 (effective dimensions is respectively 4.1mm, 1.5mm, 4.5mm and 4.7mm).
The fractal dimension of Fig. 4 sample and the relation of transmission peak wavelength.
The interaction transmission spectral line of two dendritic structures of Fig. 5 (effective dimensions is about 4.0mm).
Embodiment
1. the preparation of electrolytic solution: take by weighing 2.5～12.5gCuSO
45H
2O is dissolved in the distilled water, and adds the dense H of 5.34mL
2SO
4, fixed molten to 100mL at last, compound concentration is 0.1M～0.5M CuSO
45H
2O and 1M H
2SO
4Blue clear solution as electrodeposit liquid.
2. the preparation of electrode: anode is traditional annular copper electrode, according to the size of the internal diameter of used double dish in the experiment, the internal diameter 45mm of employed annular copper electrode among the present invention, external diameter 48mm, thickness 2mm.It is the carbon fiber of 5 μ m that negative electrode among the present invention adopts diameter, and its preparation process is to take out the negative electrode point of the carbon fiber of diameter 5 μ m as electro-deposition under optical microscope from a branch of carbon fiber.
3. the preparation of aperiodic structure infrared band negative magnetic-inductive capacity material: get the diameter size qualitative filter paper close by placement shown in the accompanying drawing 1, and add CuSO with the annular copper electrode
4Solution, the solution amount that control adds makes filter paper just be dipped into but is not covered fully.Adjust the voltage of stabilized voltage supply, and connect circuit.Dark excessively for guaranteeing that in experimentation negative electrode is unlikely to embed filter paper, the height of first fixed negative pole among the present invention, the height that has adopted a step device to regulate double dish makes filter paper contact with negative electrode, and adding one reometer contacts with filter paper just to guarantee negative electrode in the loop.The size of controlling prepared sample by the time of control electro-deposition among the present invention 1.5 in the scope of 5.0mm.
The performance of implementation procedure of the present invention and material is by embodiment and description of drawings:
Embodiment one: used electrolytic solution is 0.1M CuSO
45H
2O and 1.0M H
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.The voltage of regulating D.C. regulated power supply is 10V, connects the loop and begins electro-deposition, and current in loop is about 1.0mA.The 2 hours time of control electro-deposition, obtain the negative magnetic permeability material in aperiodic infrared band that effective dimensions is 4.1mm.The infrared transmission spectrometry of sample is carried out on FT/IR-470Plus Fourier transformation infrared spectrometer (spot diameter is 4.0mm), the modes of emplacement of sample as shown in Figure 2, measurement result is seen accompanying drawing 3 curve a.
Embodiment two: used electrolytic solution is 0.2M CuSO
45H
2O and 1.0MH
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.The voltage of regulating D.C. regulated power supply is 12V, connects the loop and begins electro-deposition, and current in loop is about 1.3mA.The 1 hour time of electro-deposition, obtain the negative magnetic permeability material in aperiodic infrared band that effective dimensions is 1.5mm.The infrared transmission spectrometry of sample is carried out on FT/IR-470Plus Fourier transformation infrared spectrometer (spot diameter is 4.0mm), the modes of emplacement of sample as shown in Figure 2, measurement result is seen accompanying drawing 3 curve b.
Embodiment three: used electrolytic solution is 0.4M CuSO
45H
2O and 1.0MH
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.The voltage of regulating D.C. regulated power supply is 15V, connects the loop and begins electro-deposition, and current in loop is about 1.5mA.The 1.5 hours time of electro-deposition, obtain the negative magnetic permeability material in aperiodic infrared band that effective dimensions is 4.5mm.The infrared transmission spectrometry of sample is carried out on FT/IR-470Plus Fourier transformation infrared spectrometer (spot diameter is 4.0mm), the modes of emplacement of sample as shown in Figure 2, measurement result is seen accompanying drawing 3 curve c.
Embodiment four: used electrolytic solution is 0.5M CuSO
45H
2O and 1.0MH
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.The voltage of regulating D.C. regulated power supply is 25V, connects the loop and begins electro-deposition, and current in loop is about 2.0mA.The 0.5 hour time of electro-deposition, obtain the negative magnetic permeability material in aperiodic infrared band that effective dimensions is 4.7mm.The infrared transmission spectrometry of sample is carried out on FT/IR-470Plus Fourier transformation infrared spectrometer (spot diameter is 4.0mm), the modes of emplacement of sample as shown in Figure 2, measurement result is seen accompanying drawing 3 curve d.
Embodiment five: used electrolytic solution is 0.2M CuSO
45H
2O and 1.0MH
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.The voltage of regulating D.C. regulated power supply is respectively 5,10, and 12,15 and 20V, to connect the loop and begin electro-deposition, current in loop control is respectively 0.6,1.0,1.3,1.5 and 1.8mA.The time of electro-deposition is respectively 3.5,3.2,2.5,2.0 and 1.5 hours, obtains effective dimensions and is respectively 2.6,4.0,4.2,3.8 and the negative magnetic permeability material in aperiodic infrared band of 5.0mm.Use branch's dimension software for calculation of downloading can obtain the fractal dimension of each sample, the infrared transmission spectrometry of sample is carried out on FT/IR-470Plus Fourier transformation infrared spectrometer (spot diameter is 4.0mm), the modes of emplacement of sample as shown in Figure 2, the relation of fractal dimension and transmission curve minimum value is seen accompanying drawing 4.
Embodiment six: used electrolytic solution is 0.1M CuSO
45H
2O and 1.0M H
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.The voltage of regulating D.C. regulated power supply is 10V, connects the loop and begins electro-deposition, and current in loop is about 1.0mA.The 2 hours time of control electro-deposition, obtain two negative magnetic permeability material in aperiodic infrared band that effective dimensions all is about 4.0mm.Two samples are stacked by different order, go up its infrared transmission interaction behavior of measurement at FT/IR-470Plus Fourier transformation infrared spectrometer (spot diameter is 4.0mm), the modes of emplacement of sample is identical with embodiment one, and measurement result is seen accompanying drawing 5.
Claims (3)
1. an aperiodic structure infrared band negative magnetic-inductive capacity material is made up of metallic copper and lignin fibre film, and its principal character is the aperiodicity dendritic structure that the elementary cell of this material is made up of metallic copper.
2. aperiodic structure infrared band negative magnetic-inductive capacity material according to claim 1, the electrodeposit liquid that it is characterized in that preparing the aperiodicity dendritic structure is CuSO
45H
2O and H
2SO
4Mixed solution, anode is the annular copper electrode, negative electrode is a carbon fiber electrode.
3. aperiodic structure infrared band negative magnetic-inductive capacity material according to claim 1 is characterized in that in preparation process as follows:
1) takes by weighing 2.5～12.5gCuSO
45H
2O is dissolved in the distilled water, and adds the dense H of 5.34mL
2SO
4, fixed molten to 100mL at last, configuration concentration is 0.1M～0.5M CuSO
45H
2O and 1M H
2SO
4Mixed solution as electrodeposit liquid;
2) anode that uses in the electrodeposition process is the annular copper electrode, its internal diameter 45mm, and external diameter 48mm, thickness 2mm reaches micron and nanoscale for guaranteeing the resulting dendritic structure of electro-deposition, and it is the carbon fiber electrode of 5 μ m that negative electrode is selected diameter for use;
3) adopt D.C. regulated power supply in the electrolytic process, decomposition voltage is between 5～25V, and Current Control is between 0.6～2.0mA, and electrodeposition time is 30～210 minutes;
4) effective dimensions of gained material changes between the 5.0mm at 1.5mm, fractal dimension is 1.73～1.81, and the resonance wavelength that adopts Fourier transformation infrared spectrometer to record sample moves to the increasing progressively to long wavelength's direction of fractal dimension with structure between the 6.0 μ m at 1.5 μ m.
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| CNB2005100427421A CN100368924C (en) | 2005-05-31 | 2005-05-31 | Negative magnetic permeability material in aperiodic infrared band |
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| CNB2005100427421A CN100368924C (en) | 2005-05-31 | 2005-05-31 | Negative magnetic permeability material in aperiodic infrared band |
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| CN100368924C true CN100368924C (en) | 2008-02-13 |
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| CN101487131B (en) * | 2008-01-18 | 2010-08-25 | 西北工业大学 | Visible light frequency band left handed material |
| CN101602577B (en) * | 2008-06-11 | 2011-11-30 | 西北工业大学 | Multicolor visible light left-handed material based on silver dendritic structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071774A2 (en) * | 2000-03-17 | 2001-09-27 | The Regents Of The University Of California | Left handed composite media |
| EP1408141A1 (en) * | 2002-10-11 | 2004-04-14 | Enthone Inc. | Process for galvanic deposition of bronze |
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2005
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071774A2 (en) * | 2000-03-17 | 2001-09-27 | The Regents Of The University Of California | Left handed composite media |
| US20010038325A1 (en) * | 2000-03-17 | 2001-11-08 | The Regents Of The Uinversity Of California | Left handed composite media |
| EP1408141A1 (en) * | 2002-10-11 | 2004-04-14 | Enthone Inc. | Process for galvanic deposition of bronze |
Non-Patent Citations (3)
| Title |
|---|
| Copper electrodeposits in paper support. D.B.Hibbert,J.R.Melrose.Physical Review A,Vol.38 No.2. 1988 * |
| 用于构成左手材料（LHMs）的开口谐振环的研究. 张富利，赵乾，刘亚红 等.北京广播学院学报（自然科学版）增刊，第10卷第4期. 2003 * |
| 负介电常数和负磁导率微波媒质的实验. 隋强，李廉林，李芳.中国科学，第33卷第5期. 2003 * |
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