Synthesis method of metallic oxide coated dissimilar metal 'core/shell'nano-particles

A technology of heterogeneous metals and oxides, applied in the direction of coating, etc., can solve the problems of high cost, complicated process, environmental pollution, etc., and achieve the effect of low cost and simple process

Inactive Publication Date: 2009-02-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Solve the problems of complex process, high cost and environmental pollution in the preparation of nanocomposite particles with "core / shell" structure at present, endow the nanocomposite particles with various characteristics such as electricity, magnetism, light and heat, and realize electromagnetic wave absorption / shielding materials, Applications in magnetic media, catalysts, biomedicine, magnetic / electrorheological materials, optoelectronic materials, etc.

Method used

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  • Synthesis method of metallic oxide coated dissimilar metal 'core/shell'nano-particles
  • Synthesis method of metallic oxide coated dissimilar metal 'core/shell'nano-particles
  • Synthesis method of metallic oxide coated dissimilar metal 'core/shell'nano-particles

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Experimental program
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Effect test

Embodiment 1

[0035] The raw materials of nickel micron powder and alumina micron powder are uniformly mixed according to the mass ratio of 5:1, and pressed into blocks. The mixed sample block was used as the anode, and the tungsten electrode was used as the cathode. Evacuate the reaction chamber to a vacuum of 10 -3 About Torr, 350 Torr of hydrogen and 350 Torr of argon are introduced, and the discharge evaporation is carried out in the DC arc plasma device. The discharge current is 150-200 amperes; the voltage is 20-40 volts. After the reaction is over, after the floating powder is deposited on the wall of the reaction chamber, the hydrogen and argon are pumped out to 10 -1~1.0 Torr, let stand for 6~12 hours to complete passivation. A large amount of black powder is deposited on the inner wall of the reaction chamber, and the powder is collected.

Embodiment 2

[0037] The raw materials of iron micron powder and manganese oxide micron powder are uniformly mixed according to the mass ratio of 5:1, and pressed into blocks. The mixed sample block was used as the anode, and the tungsten electrode was used as the cathode. Evacuate the reaction chamber to a vacuum of 10 -3 About Torr, 350 Torr of hydrogen and 350 Torr of argon are introduced, and the discharge evaporation is carried out in the DC arc plasma device. The discharge current is 150-200 amperes; the voltage is 20-40 volts. After the reaction is over, after the floating powder is deposited on the wall of the reaction chamber, the hydrogen and argon are pumped out to 10 -1 ~1.0 Torr, let stand for 6-12 hours to complete passivation. A large amount of black powder is deposited on the inner wall of the reaction chamber, and the powder is collected.

Embodiment 3

[0039] The raw materials of nickel micron powder and titanium oxide micron powder are uniformly mixed according to the mass ratio of 5:1, and pressed into blocks. The mixed sample block was used as the anode, and the tungsten electrode was used as the cathode. Evacuate the reaction chamber to a vacuum of 10 -3 About Torr, 350 Torr of hydrogen and 350 Torr of argon are introduced, and the discharge evaporation is carried out in the DC arc plasma device. The discharge current is 150-200 amperes; the voltage is 20-40 volts. After the reaction is over, after the floating powder is deposited on the wall of the reaction chamber, the hydrogen and argon are pumped out to 10 -1 ~1.0 Torr, let stand for 6~12 hours to complete passivation. A large amount of black powder is deposited on the inner wall of the reaction chamber, and the powder is collected.

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Abstract

The invention relates to a method for synthesizing a metal oxide-coated heterogeneous metal core-shell type nanometer particle, which belongs to the technical field of synthesizing nanometer composite material. The method is characterized in that metal and heterogeneous metal oxide micron powder is used as raw material and evenly mixed and pressed into block target material to be used as an anode. Hydrogen plasma is utilized as the heat source; the block target material is evaporated, and the core-shell type nanometer composite particle material is formed after the transformation of gaseous state-liquid state-solid state. The effect and advantage of the invention lies in that the root position-coating of the metal oxide pottery material to heterogeneous metal is realized in the process of evaporation and condensation; the invention is characterized by a simple method, low cost, little impurity, regular shape of the particle, and application to large scale production. The method can be used for preparing the core-shell type nanometer composite particles of a large variety of matters, and has wide application prospect in the fields of electromagnetic absorption / shielding, biomedicine, optoelectronic material, magnetic material, electrorheological fluid, and functional paint, etc.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nanocomposite materials. It uses metal oxide micron powder and heterogeneous metal micron powder as raw materials, presses it into a composite block target material, utilizes DC arc discharge to evaporate, and undergoes gas-liquid-solid phase transition. Mechanism, a method of synthesizing "core / shell" type metal oxide ceramics coated heterogeneous metal nanocomposite particle materials. Background technique [0002] Nanoparticles usually refer to ultrafine particles with a size distribution between 1-100nm, which have surface interface effects, small size effects and quantum size effects that are completely different from bulk materials. The special properties of nanoparticles make them useful in catalysis, optoelectronics, It has very important application prospects in medicine, magnetic media, and electromagnetic wave absorbing materials. The research and development of metal nanoparticle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 董星龙张雪峰黄昊吕波俞快王登科雷军鹏
Owner DALIAN UNIV OF TECH
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