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Preparation method of carbon-cladded magnetic metal nanometer material

A magnetic metal nano and carbon-coated technology, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as difficulty in large-scale production, high preparation temperature, and complex equipment, and achieve easy control of reaction parameters , low energy consumption, low temperature effect

Inactive Publication Date: 2007-04-25
ANHUI NORMAL UNIV
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Problems solved by technology

[0003] The traditional preparation of carbon-coated magnetic metal nanomaterials is the use of physical means such as arc discharge technology, ion beam sputtering, electron beam irradiation, laser evaporation, plasma evaporation, vapor deposition, pyrolysis, metal-containing Carbon gel explosion method, etc. These methods use complex equipment, high energy consumption, high cost, cumbersome operation, high preparation temperature, violent reaction, and many by-products, so it is difficult to achieve large-scale production

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  • Preparation method of carbon-cladded magnetic metal nanometer material

Examples

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Effect test

Embodiment 1

[0021] Under argon protection, 1.9568g CoCl 2 ·6H 2 O is completely dissolved in 20mL of absolute ethanol, and a reducing agent is added while stirring, and the reducing agent is composed of 85% weight concentration of NH 2 -NH 2 ·H 2 O aqueous solution 12mL and 2.0382g NaOH composition. After reacting at 35°C for 30 minutes, the obtained product was centrifuged and washed twice with water and ethanol in sequence to obtain 340 mg of dendritic metal cobalt.

[0022] 40 mg of the obtained cobalt metal was placed in 40 mL of 0.13 M aqueous glucose solution. Sonicate for 15 minutes and place the mixture in a polytetrafluoroethylene reactor. React at 160°C for 16 hours. Cool naturally at room temperature, centrifuge, wash with water and acetone twice in sequence, and dry in vacuum at room temperature. The carbon-coated dendritic cobalt material can be obtained, and the thickness of the carbon coating is about 250 nanometers.

Embodiment 2

[0024] Take 160 mg of the dendritic metal cobalt obtained in Example 1 and place it in 40 mL of 0.13 M glucose deoxygenated aqueous solution. After ultrasonication for 15 minutes, place the mixture in a polytetrafluoroethylene reactor and react at 180° C. for 16 hours. Cool, centrifuge, wash with water and acetone in turn, and dry under vacuum at room temperature. A carbon-coated dendritic cobalt material can be obtained, and the thickness of the carbon coating is about 100 nanometers.

[0025] In Examples 1 and 2, different carbon coating thicknesses can be obtained by controlling the weights of glucose and metal cobalt.

Embodiment 3

[0027] Under argon protection, 0.1396g FeSO 4 ·7H 2 O and 0.1492g NiSO 4 ·6H 2 O was completely dissolved in 10 mL of water, then 1.3601 g of polyethylene glycol (Mw=20000) and 0.5 mL of cyclohexane were added, ultrasonicated at room temperature for 80 minutes, then the mixture was heated to 78 °C, and a reducing agent was added. Consisting of 85% by weight NH 2 -NH 2 ·H 2 O aqueous solution 5mL and 1.0352g NaOH, reacted for 30 minutes to obtain a black sample, centrifuged, washed with water and ethanol twice to obtain 50 mg of iron-nickel alloy nanoparticles with a diameter of about 35 nanometers.

[0028] 19.6 mg of the obtained iron-nickel alloy nanoparticles were placed in 38 mL of deoxygenated water, and then dissolved in 3.0159 g of glucose. After ultrasonication for 15 minutes, the mixture was placed in a polytetrafluoroethylene reactor and reacted at 170° C. for 3.5 hours. Cool naturally at room temperature, centrifuge, wash with water and acetone twice in sequen...

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Abstract

The invention relates to a method for preparing carbon packed magnetic metal nanometer materials. Wherein, it comprises that magnetic metal nanometer particle preparation and carbon package; in the second step, it adds the product of first step into the water solution of carbohydrate, mixing and increasing temperature to 160Deg. C, for 2h, separating, washing and drying. Compared with present technique, the invention has worm liquid carbonization condition, low temperature, the state of metal nanometer particles will not change, and the invention can obtain variable particles. And it can control the ratio between carbohydrate and magnetic metal nanometer particles, to control the carbon layer thickness. The invention has simple structure and short time.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of magnetic metal materials, in particular to the technical field of carbon-coated magnetic metal nanometer materials. Background technique [0002] Magnetic metal nanomaterials have very important applications in the fields of high-density magnetic recording devices, magnetic fluids, magnetic refrigeration systems, magnetic effect imaging, targeted drug carriers, and catalysts. However, due to their high surface energy and strong interparticle interactions, magnetic metal nanoparticles are very easy to oxidize and agglomerate. Without protective measures, magnetic metal nanoparticles will immediately oxidize or even "spontaneously ignite" when exposed to air. This has become an important link affecting its application. An effective measure to prevent its oxidation and agglomeration is to coat the nanoparticles with a carbon shell. Since the carbon shell can imprison metal substance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02H01F41/00
Inventor 魏先文朱国兴
Owner ANHUI NORMAL UNIV
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