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Method for preparing nano complex particle for highly conductive and magnetic electro-magnetic screen

A nanocomposite particle and electromagnetic shielding technology, which is applied in the field of functional inorganic materials and nanoscience, can solve the problems of poor conductivity, anti-oxidation and acid and alkali resistance, low saturation magnetization, and poor frequency shielding performance, and achieve magnetic conduction and conduction Excellent performance, improved magnetic performance, and low production cost

Inactive Publication Date: 2011-01-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to Schelkunoff's electromagnetic shielding theory, an ideal electromagnetic shielding material should have high electrical conductivity and magnetic permeability to better realize the reflection loss and absorption loss of electromagnetic waves respectively. However, this cannot be directly found in actual materials. ideal material
[0003] FeNi alloy magnetic nanoparticles have unique soft magnetic material properties such as high magnetic permeability, high use frequency, high Curie temperature, low coercive force, high saturation magnetization and low magnetic anisotropy constant. ) has excellent wave-absorbing performance, but its conductivity, oxidation resistance and acid and alkali resistance are poor, and its frequency shielding performance in the high frequency band (above 1GHz) is poor

Method used

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  • Method for preparing nano complex particle for highly conductive and magnetic electro-magnetic screen
  • Method for preparing nano complex particle for highly conductive and magnetic electro-magnetic screen
  • Method for preparing nano complex particle for highly conductive and magnetic electro-magnetic screen

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Get the ferrous salt and nickel salt that the total molar number is 0.005mol, wherein the molar number of ferrous salt accounts for 50%, that is, 0.72gFeSO 4 ·7H 2 O, 0.64g NiCl 2 ·6H 2 O, take another 0.017mol polyethylene glycol (PEG400) and 0.8ml cyclohexane, add water to 50ml, heat to 80°C after dispersion, add 20ml hydrazine hydrate (0.30mol) and 2.47 under ultrasonic conditions (100w, 40kHz) gNaOH mixed solution (use NaOH to adjust the pH value to 9-13), react for 30min, cool to room temperature, centrifuge wash three times, absolute ethanol wash twice, and vacuum dry at room temperature for 4h to obtain FeNi alloy nanoparticles, the morphology of which is shown in figure 1 , it can be seen that it is a spherical particle with a particle size of about 50nm and a relatively uniform particle size distribution. Hysteresis loop of FeNi alloy nanoparticles see Figure 9 ,Depend on Figure 9It can be seen that the magnetic saturation intensity is 86.7emu / g, and the...

Embodiment 2

[0043] Get the ferrous salt and nickel salt that the total molar number is 0.005mol, wherein the molar number of ferrous salt accounts for 50%, that is, 0.72gFeSO 4 ·7H 2 O, 0.64g NiCl 2 ·6H 2 O, take another 0.017mol polyethylene glycol (PEG400) and 0.8ml cyclohexane, add water to 50ml, disperse and heat to 80°C, add 20ml hydrazine hydrate (0.30mol) and 2.47g NaOH under the condition of mechanical stirring (400rpm) (adjust the pH value to 9-13 with NaOH), react for 1 hour, mature for 30 minutes, wash three times with centrifugal water, wash twice with absolute ethanol, and then vacuum-dry at room temperature for 4 hours to obtain FeNi alloy nanoparticles, the morphology of which is shown in figure 2 , it can be seen that it is a spherical particle with a particle size of about 50 nm and a uniform particle size distribution.

[0044] Take 0.2g of FeNi alloy nanoparticles obtained above, 0.4g of glucose, add 50ml of absolute ethanol, ultrasonically disperse for 30min, add 5...

Embodiment 3

[0046] Get the ferrous salt and nickel salt that the total molar number is 0.005mol, wherein the molar number of ferrous salt accounts for 20%, that is 0.28gFeSO 4 ·7H 2 O, 0.95gNiCl 2 ·6H 2 O, take another 0.017mol polyethylene glycol (PEG400) and 0.8ml cyclohexane, add water to 50ml, disperse and heat to 80°C, add 20ml hydrazine hydrate (0.30mol) and 2.47g NaOH under the condition of mechanical stirring (400rpm) The mixed solution was reacted for 1 h, matured for 30 min, washed three times with centrifugation, washed twice with absolute ethanol, and then vacuum-dried at room temperature for 4 h to obtain FeNi alloy nanoparticles, the morphology of which is shown in image 3 , it can be seen that it is a spherical particle with a particle size between 50 and 100 nm and a uniform particle size distribution. Hysteresis loop of FeNi alloy nanoparticles see Figure 10 ,Depend on Figure 10 It can be seen that the magnetic saturation intensity is 71.9emu / g, and the hysteresis...

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Abstract

The invention relates to a method for preparing a nanometer composite particle for electromagnetic shielding. The method for preparing the high electric and magnetic conduction nanometer composite particle for electromagnetic shielding is characterized in that the method comprises the following steps: 1) material selection; 2) ferrite and nickel salt are mixed, added with polyethylene glycol and cyclohexane, then added with water and are stirred and dispersed to obtain a mixed solution; 3) the mixed solution is added with a strong reducer at a temperature of between 25 and 90 DEG C, reacts for 5 to 60 minutes under alkali condition with PH value of between 9 and 13, is cooled to normal temperature, and is washed and dried to obtain FeNi alloy nanometer particles; and 4) the FeNi alloy nanometer particles are added into anhydrous ethyl ethanol, added with a weak reducer, subjected to ultrasonic dispersion for 30 to 60 minutes, then added with a silver ammonia solution, stirred at a temperature of between 25 and 90 DEG C, react for 0.5 to 2 hours, cooled to normal temperature and are washed and dried to obtain the high electric and magnetic conduction nanometer composite particle for electromagnetic shielding. The method has the advantages of simple process, environmental protection, low production cost and high yield; and the product has excellent magnetic and electric conduction performances.

Description

technical field [0001] The invention relates to a preparation method of nanocomposite particles for electromagnetic shielding, which belongs to the field of functional inorganic materials and also belongs to the field of nano science and technology. Background technique [0002] With the rapid development of the electronic industry, especially computers and mobile phones, and the wide application of electronic and electrical equipment, the problem of electromagnetic interference (EMI) is becoming more and more serious. It has become a new pollution and has attracted widespread attention from all over the world. In order to solve the problem of electromagnetic interference (EMI), electromagnetic shielding materials have been developed rapidly. According to Schelkunoff's electromagnetic shielding theory, an ideal electromagnetic shielding material should have high electrical conductivity and magnetic permeability to better realize the reflection loss and absorption loss of ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24
Inventor 章桥新周少锋黄进冯良东
Owner WUHAN UNIV OF TECH
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