CN1139449C - Graphite arc discharge method for synthesizing carbon-clad nm ferromagnetic metal particles - Google Patents
Graphite arc discharge method for synthesizing carbon-clad nm ferromagnetic metal particles Download PDFInfo
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- CN1139449C CN1139449C CNB011277181A CN01127718A CN1139449C CN 1139449 C CN1139449 C CN 1139449C CN B011277181 A CNB011277181 A CN B011277181A CN 01127718 A CN01127718 A CN 01127718A CN 1139449 C CN1139449 C CN 1139449C
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Abstract
The present invention relates to a graphite arc discharge method for synthesizing carbon wrapped nanometer ferromagnetic metal particles, which comprises: (1), a low voltage high current graphite electrode discharge device is used; (2), a composite anode rod is manufactured, and a pure graphite cathode rod is used; (3) the anode rod and the cathode rod discharge in a reaction chamber in inert gas; (4) the carbon wrapped nanometer magnetic metal particles are synthesized. The carbon wrapped nanometer ferromagnetic metal particles synthesized by the present invention have a greatly improved oxidation resistance property, are difficult to be oxidized, and have more extensive application.
Description
The present invention is the graphite arc discharge method of synthesizing carbon-clad nm ferromagnetic metal particles, the technology of preparing of metal nanometer material.
The ferromagnetic metal nano particle is owing to have the characteristics such as small-size effect, quantum size effect and skin effect that nano material has, and makes it have the not available good magnetic characteristic of conventional coarse grain material of the same race and obtains extensive use in high-technology field.For example they have single domain structure, have very high coercivity, thereby can improve during as magnetic record material and believe/make an uproar ratio, improve picture quality; They can also be controlled light transmission capacity by change magnetic field and be applied to optical shutter, light regulator; Also can be used as magnetic carrier, cell magnetic separating medium material, the duplicator ink powder material of cancer therapy drug in addition and be used for multiple uses such as magnetic printing.But,, influenced the application of such nano particle because the surface-active height of nanoparticle has also caused the ferromagnetic metal nano particle to have oxidized shortcoming easily.
Purpose of the present invention be exactly for overcome and solve the ferromagnetic metal nano particle that prior art makes oxidized easily, influence its shortcoming that is widely used and problem, the research invention is a kind of can make the ferromagnetic metal nano particle be difficult to oxidized, non-oxidizability improves greatly, make it use the graphite arc discharge method of synthesizing carbon-clad nm ferromagnetic metal particles widely.
The present invention realizes by following technical proposals: (1) selects electric discharge device for use: the low-voltage, high-current graphite electrode electric discharge device of selecting voltage 19V～30V, electric current 45A～100A for use; (2) make composite anode: ferromagnetic metal micro mist with 5～40% and 95～60% graphite powder are mixed and made into the composite anode rod, the pure graphite rod of negative electrode; (3) down discharge of inert gas: after reative cell vacuumized, feeding pressure was helium (He) gas or neon (Ne) gas or argon (Ar) gas of 80～700 millimetress of mercury, and maintained and discharge under this pressure; (4) the ferromagnetic metal nano particle of synthetic carbon parcel: the powder that obtains after the discharge is carbon-clad nm ferromagnetic metal particles, and the diameter of metal nanoparticle is 5～50nm, and is different with the difference of above-mentioned process conditions.
The present invention compared with prior art has following advantage and beneficial effect: the ferromagnetic metal nano particle that makes with the inventive method, because the ferromagnetic metal nano particle is after carbon coats, its non-oxidizability improves greatly.For instance, it is oxidation very easily that Fe nanometer particles places air, but through the Fe nanometer particles of carbon parcel is placed the several months in air after, detect through X-ray diffraction analysis, still do not contain oxide in the powder, this has just proved the non-oxidizability that has increased Fe nanometer particles with the synthetic carbon-clad nm ferromagnetic metal particles of the inventive method after carbon coats.
Embodiments of the present invention are fairly simple, as long as progressively operate by described method step of top explanation and process conditions, just can implement the present invention preferably.The inventor passes through years of researches, tests, has various successful embodiment, only is shown in table 1 for 3 embodiment below.Table 1:
Claims (1)
1, a kind of graphite arc discharge method of synthesizing carbon-clad nm ferromagnetic metal particles is characterized in that: (1) selects electric discharge device for use: the low-voltage, high-current graphite electrode electric discharge device of selecting voltage 19V～30V, electric current 45A～100A for use; (2) make composite anode: ferromagnetic metal micro mist with 5～40% and 95～60% graphite powder are mixed and made into the composite anode rod, the pure graphite rod of negative electrode; (3) down discharge of inert gas: after reative cell vacuumized, feeding pressure was helium (He) gas or neon (Ne) gas or argon (Ar) gas of 80～700 millimetress of mercury, and maintained and discharge under this pressure; (4) the ferromagnetic metal nano particle of synthetic carbon parcel: the powder that obtains after the discharge is carbon-clad nm ferromagnetic metal particles, and the about 5～50nm of the diameter of metal nanoparticle is different with the difference of above-mentioned process conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011277181A CN1139449C (en) | 2001-08-09 | 2001-08-09 | Graphite arc discharge method for synthesizing carbon-clad nm ferromagnetic metal particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011277181A CN1139449C (en) | 2001-08-09 | 2001-08-09 | Graphite arc discharge method for synthesizing carbon-clad nm ferromagnetic metal particles |
Publications (2)
| Publication Number | Publication Date |
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| CN1334160A CN1334160A (en) | 2002-02-06 |
| CN1139449C true CN1139449C (en) | 2004-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011277181A Expired - Fee Related CN1139449C (en) | 2001-08-09 | 2001-08-09 | Graphite arc discharge method for synthesizing carbon-clad nm ferromagnetic metal particles |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441342C (en) * | 2005-10-21 | 2008-12-10 | 安徽师范大学 | Preparation method of carbon-cladded magnetic metal nanometer material |
| CN101853727A (en) * | 2010-05-21 | 2010-10-06 | 山东大学 | Iron-carbon nano composite electromagnetic wave absorption material and preparation method thereof |
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| CN100384475C (en) * | 2002-10-29 | 2008-04-30 | 德州科隆载体研究所 | Preparation method of magnetic guiding anticancer medicine |
| CN100515615C (en) * | 2005-09-23 | 2009-07-22 | 上海华明高技术（集团）有限公司 | Carbon-coated magnetic superfine iron particle and its manufacturing method |
| CN100455383C (en) * | 2006-11-03 | 2009-01-28 | 大连理工大学 | Method for preparing carbon-coated metal nano material whose particle diameter is controllable |
| EP2383374A1 (en) * | 2010-04-29 | 2011-11-02 | BASF Corporation | Nano-particles containing carbon and a ferromagnetic metal or alloy |
| CN102784913A (en) * | 2012-07-26 | 2012-11-21 | 天津大学 | Hydrothermal preparation method of carbon-coated iron nanoparticles |
| CN104588671B (en) * | 2015-01-09 | 2017-04-05 | 中国久远高新技术装备公司 | The metal powder preparation method and device of contactless melting are heated based on straight resistance |
| CN108480623B (en) * | 2018-04-25 | 2020-12-15 | 北京化工大学 | Macroscopic preparation method of carbon-coated metal nanoparticles |
| CN109126719A (en) * | 2018-11-06 | 2019-01-04 | 肖志宇 | A kind of cyanobacteria agent for capturing and preparation method thereof containing the magnetic rice husk that is carbonized |
| CN112432983B (en) * | 2020-12-09 | 2022-11-18 | 杭州电子科技大学 | Aptamer sensor for detecting tetracycline and preparation method and application thereof |
| CN113695588B (en) * | 2021-08-30 | 2023-12-26 | 炭索未来(广东)生态环境科技有限公司 | High-activity zero-valent iron composite material and preparation method and application thereof |
-
2001
- 2001-08-09 CN CNB011277181A patent/CN1139449C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441342C (en) * | 2005-10-21 | 2008-12-10 | 安徽师范大学 | Preparation method of carbon-cladded magnetic metal nanometer material |
| CN101853727A (en) * | 2010-05-21 | 2010-10-06 | 山东大学 | Iron-carbon nano composite electromagnetic wave absorption material and preparation method thereof |
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| Publication number | Publication date |
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| CN1334160A (en) | 2002-02-06 |
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