Method for preparing C-SiO2-Fe/M magnetic mesoporous composite material for electromagnetic wave adsorption coating

A technology of c-sio2-fe and composite materials, applied in radiation-absorbing coatings, magnetic properties of inorganic materials, etc., can solve problems such as difficult dispersion of carbon nanotubes

Active Publication Date: 2010-09-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to disperse carbon nanotubes in polymer binders is still a big problem

Method used

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  • Method for preparing C-SiO2-Fe/M magnetic mesoporous composite material for electromagnetic wave adsorption coating
  • Method for preparing C-SiO2-Fe/M magnetic mesoporous composite material for electromagnetic wave adsorption coating
  • Method for preparing C-SiO2-Fe/M magnetic mesoporous composite material for electromagnetic wave adsorption coating

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0022] (1) On the basis of the soft template self-assembly method, mix 1g of surfactant F127, 0.5mL of furfuryl alcohol, 0.001mol of ferric chloride and 1g of ethyl orthosilicate;

[0023] (2) Transfer the mixture to a flat-bottomed evaporating dish, evaporate the solvent overnight at room temperature, put it in an oven at 70°C for thermal polymerization for 24 hours, and form a tan film;

[0024] (3) Scrape it off and put it into a porcelain boat for carbonization. Carbonization is carried out in an atmosphere tube furnace with a nitrogen gas flow, and the temperature is kept at 350°C for 3 hours, and at 500°C for 2 hours, and the heating rate is strictly controlled at 1°C / min;

[0025] (4) Label the product in the form of CS-xFe-y, ​​wherein x represents the amount of the substance added with iron salt (mmol), and y represents the calcination temperature, and the sample is named CS-Fe-500.

[0026] The method is simple and easy, and the preparation cost is low. In the obtaine...

specific Embodiment 2

[0027] (1) On the basis of the soft template self-assembly method, mix 1g of surfactant F127, 0.5mL of furfuryl alcohol, 0.001mol of ferric chloride and 1g of ethyl orthosilicate;

[0028] (2) Transfer the mixture to a flat-bottomed evaporating dish, evaporate the solvent overnight at room temperature, put it in an oven at 70°C for thermal polymerization for 24 hours, and form a tan film;

[0029] (3) Scrape it off and put it into a porcelain boat for carbonization. Carbonization is carried out in an atmosphere tube furnace with a nitrogen gas flow, and the temperature is kept at 350°C for 3 hours, and at 700°C for 2 hours, and the heating rate is strictly controlled at 1°C / min;

[0030] (4) Label the product in the form of CS-xFe-y, ​​where x represents the amount of the substance added with iron salt (mmol), and y represents the calcination temperature. The sample is named CS-Fe-700.

[0031] The method is simple and easy, and the preparation cost is low. In the obtained CS...

specific Embodiment 3

[0032] (1) On the basis of the soft template self-assembly method, mix 1g of surfactant F127, 0.5mL of furfuryl alcohol, 0.002mol of ferric chloride and 1g of ethyl orthosilicate;

[0033] (2) Transfer the mixture to a flat-bottomed evaporating dish, evaporate the solvent overnight at room temperature, put it in an oven at 120°C for thermal polymerization for 24 hours, and form a tan film;

[0034] (3) Scrape it off and put it into a porcelain boat for carbonization. Carbonization is carried out in an atmosphere tube furnace with a nitrogen gas flow, and the temperature is kept at 350°C for 3 hours, and at 700°C for 2 hours, and the heating rate is strictly controlled at 1°C / min;

[0035] (4) Label the product in the form of CS-xFe-y, ​​wherein x represents the amount of the substance added with iron salt (mmol), and y represents the calcination temperature. The sample is named CS-2Fe-700.

[0036] This method is simple and easy to implement, and the preparation cost is low. ...

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Abstract

The invention relates to a method for preparing a C-SiO2-Fe / M magnetic mesoporous composite material for an electromagnetic wave adsorption coating and belongs to the method for preparing the electromagnetic wave adsorption coating. In the method, magnetic metals are introduced into an ordered mesoporous carbon-silicon oxide compound by combining a solvent evaporation induced self-assembly method with in-situ carbothermic reduction technology, wherein triblock copolymer F127 serves as a structure directing agent; furfuryl alcohol serves as a carbon source; TEOS serves as a silicon source, ferric chloride and M salt serve as metal sources. Metal ions are reduced into metal particles in the carbonation process and the metal particles are highly dispersed in a carbon matrix, so that the ordered mesoporous structure of the compound does not be damaged. Therefore, in the preparation method, the operation of inducing the magnetic components and forming holes can be simultaneously completed, effective adsorption of the electromagnetic wave is ensured, the adsorption frequency range is convenient to expand, the aim of the 'thin, light, wide and strong' composite material is fulfilled, and the method can be widely applied to civilian and military and is more practical.

Description

technical field [0001] This invention is a kind of C-SiO2 for electromagnetic wave absorbing coating 2 - The preparation method of Fe / M magnetic mesoporous composite material belongs to the technical field of preparation of electromagnetic wave absorbing coatings. technical background [0002] With the explosive development of information technology and electromagnetic wave communication, the problem of electromagnetic interference in the gigahertz frequency band has become increasingly prominent. Electromagnetic interference pollution can lead to failure of electronic equipment and systems in medical, industrial, commercial, military and other fields. When organisms are exposed to electromagnetic radiation for a long time, it will also cause potential harm. Electromagnetic interference shielding or electromagnetic wave absorbing materials are used to attenuate these excess electromagnetic energy, which is very important for both civilian and military applications. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/12H01F1/33C09D5/32
Inventor 周建华何建平王涛李国显郭云霞赵建庆吴士超丁晓春
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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