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Preparation of surface load magnetic alloy particle carbon nano-tube composite material

A carbon nanotube and magnetic alloy technology, applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., can solve the problem of no nano-alloy particles, and achieve simple preparation methods, excellent magnetic properties, and complete alloy crystals. Effect

Inactive Publication Date: 2009-08-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical co-precipitation is the most widely used method for liquid-phase chemical synthesis of high-purity nanoparticles. It has a wide range of applications. In addition to preparing various insoluble metal hydroxides and oxides, it can also be used to prepare carbonates. , oxalate, sulfate and phosphate [Xu Li, Zhang Hongtao, Hong Jianmin, etc., Journal of Inorganic Chemistry, 2005, 21(5): 741-743], but there is no report on the preparation of nano-alloy particles

Method used

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  • Preparation of surface load magnetic alloy particle carbon nano-tube composite material
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  • Preparation of surface load magnetic alloy particle carbon nano-tube composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 0.36 g of multi-walled carbon nanotubes for pretreatment. The treatment process is: (a) ultrasonically disperse the carbon nanotubes into concentrated sulfuric acid (60%wt) and concentrated nitric acid (67%wt) (volume ratio 1:1) (b) reflux heating the mixed solution for 2 to 4 hours; (c) stop heating, dilute the solution to take out the carbon nanotubes, rinse with deionized water until neutral, and dry for later use;

[0026] The pretreated carbon nanotubes were placed in 1500 ml of deionized water, and dispersed evenly by ultrasonic. Take by weighing 3.569 grams of analytically pure cobalt chloride hexahydrate (CoCl 2 ·6H 2 O), 4.054 grams of ferric chloride hexahydrate (FeCl 3 ·6H 2 O), dissolved in the carbon nanotube solution that has been configured. In addition, 4 grams of sodium hydroxide was dissolved in 1 liter of deionized water to make an alkaline solution, which was slowly added dropwise to the above-mentioned carbon nanotube mixed solution, and at...

Embodiment 2

[0030] Take 0.72 g of multi-walled carbon nanotubes for pretreatment. The treatment process is: (a) ultrasonically disperse the carbon nanotubes into concentrated sulfuric acid (60%wt) and concentrated nitric acid (67%wt) (volume ratio 1:1) (b) reflux heating the mixed solution for 2 to 4 hours; (c) stop heating, dilute the solution to take out the carbon nanotubes, rinse with deionized water until neutral, and dry for later use;

[0031] The pretreated carbon nanotubes were placed in 1000 ml of deionized water, and dispersed uniformly by ultrasonic. Weigh 2.379 grams of analytically pure cobalt chloride hexahydrate (CoCl 2 ·6H 2 O), 2.703 grams of ferric chloride hexahydrate (FeCl 3 ·6H 2 O), dissolved in the carbon nanotube solution that has been configured. In addition, 4 grams of sodium hydroxide was dissolved in 1 liter of deionized water to form an alkaline solution, which was added dropwise to the above mixed solution with a peristaltic pump at a rate of 2ml / min, whil...

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Abstract

The invention discloses a preparation method for carbon nano tube surface loaded magnetic alloy nano particle composite material, which belongs to the field of electromagnetic wave absorbing material preparation. The preparation method comprises the following steps: after purifying and activating a carbon nano tube, evenly dispersing the carbon nano tube to chloride salt solution of iron, cobalt and nickel, slowing adding an alkali solution dropwise into the solution in the fierce agitation process, and regulating the pH value of the solution and making iron ions, cobalt ions and nickel ions be coprecipitated onto the surface of the carbon nano pipe in the form of hydroxide according to the alloy proportion set when the solution is prepared; taking out a deposit by centrifugation or filtering; and after drying the deposit, carrying out the heat treatment of the deposit in the reducing atmosphere to obtain the carbon nano tube composite material loaded with magnetic alloy particles. The preparation method adopts a simple process. As no impurity element is introduced into the preparation process, the obtained magnetic alloy particles have high degree of crystallinity and excellent magnetic properties. In addition, the method has easy regulation of the alloy components. The composite material prepared by the method is significantly applied in the fields of electromagnetic interference resistance, stealth, microwave darkrooms, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, in particular to a preparation method of a composite material in which magnetic alloy particles are loaded on the surface of carbon nanotubes. Background technique [0002] With the development of science and technology, various electronic devices are widely used, which brings a lot of convenience to people, but electromagnetic radiation also has some negative effects, which has become an invisible environmental pollution. On the one hand, electromagnetic radiation causes electromagnetic interference to surrounding electronic instruments and equipment, which causes their working procedures to be disordered and produces wrong actions; on the other hand, electromagnetic radiation also leaks information, making computers and other instruments lack information security; Electromagnetic radiation can also threaten people's health. Therefore, electromagnetic radiat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/00C09C3/04C09C3/06C09K3/00C22C19/03C22C19/07C22C30/00C22C38/08C22C38/10
Inventor 康飞宇李祯王晨吕瑞涛桂许春顾家琳王昆林吴德海
Owner TSINGHUA UNIV
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