Hollow core-shell structure Fe3O4@SiO2@PANI wave-absorbing agent and preparation method

A technology of core-shell structure and wave absorbing agent, which is applied in the field of hollow core-shell structure Fe3O4@SiO2@PANI wave absorbing agent and preparation, which can solve the problems of poor stability, high density, and easy corrosion of conductive polymer materials, and achieve hollow core Clear shell structure, reduced experimental steps, and controllable experimental conditions

Inactive Publication Date: 2021-10-22
ZHONGYUAN ENGINEERING COLLEGE
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it can be seen from the retrieved literature that the relatively mature absorbing materials include magnetic materials, carbon materials, and conductive polymer materials. Although single-component absorbing materials have certain advantages, they are not used alone as absorbing materials. There are some disadvantages: magnetic materials mainly have disadvantages such as high density, high processing cost, and easy corrosion; carbon materials have poor impedance matching and weak absorption performance; conductive polymer materials have poor stability, and it is difficult to meet the requirements of the current era for wave absorption. The performance requirements of "bandwidth, low density, strong absorption, good heat resistance, and oxidation resistance" of materials, therefore, compounding different types of materials is the development direction of electromagnetic wave absorbing materials

Method used

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  • Hollow core-shell structure Fe3O4@SiO2@PANI wave-absorbing agent and preparation method
  • Hollow core-shell structure Fe3O4@SiO2@PANI wave-absorbing agent and preparation method
  • Hollow core-shell structure Fe3O4@SiO2@PANI wave-absorbing agent and preparation method

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preparation example Construction

[0023] The invention provides a hollow core-shell structure Fe 3 o 4 @SiO 2 The preparation method of @PANI wave absorbing agent, comprises the following steps:

[0024] Step 1: Fe 3 o 4 Preparation of nanospheres: FeCl 3 ·6H 2 O was dissolved in 40 mL of ethylene glycol, and CH was added 3 COONa and 1.0000g polyethylene glycol 2000, where FeCl 3 ·6H 2 O and CH 3 The molar ratio of COONa is 1:5~6. After mixing evenly, adopt a one-step hydrothermal method to react at 200°C for 8 hours, separate the product by magnetic separation, wash with water and alcohol for many times, and obtain a magnetic black powder after vacuum drying. 3 o 4 nanospheres.

[0025] Step 2: Fe 3 o 4 Activation of nanospheres: the Fe obtained in the above step 1 3 o 4 The molar ratio of nanospheres and PVP is 1:1~2, dispersed in deionized water and stirred evenly, and then the product is separated by magnetic separation, and the obtained activated Fe 3 o 4 The nanospheres were washed repea...

Embodiment 1

[0030] Step 1: Add 1.3500g FeCl 3 ·6H 2 O was dissolved in 40 mL of ethylene glycol, and 3.6000 g of CH was added 3 COONa·3H 2 O and 1.0000g polyethylene glycol 2000, mixed evenly, reacted at 200°C for 8 hours by one-step hydrothermal method, separated the product by magnetic separation, washed with water and alcohol for many times, and obtained a magnetic black powder after vacuum drying, namely Fe3O4 nanospheres.

[0031] Step 2: the 0.5gFe obtained in the above step 1 3 o 4 Nanospheres and 1gPVP were dispersed in 200mL deionized water and stirred evenly, and then the product was separated by magnetic separation, and the obtained activated Fe 3 o 4 The nanospheres were washed repeatedly with deionized water and absolute ethanol, and dried at 60 °C for 24 h.

[0032] Step 3: First prepare a mixed solution of 80mL of absolute ethanol, 20mL of deionized water and 2mL of ammonia water, and then add 0.2g of activated Fe 3 o 4 The nanospheres were dispersed in the above m...

Embodiment 2

[0036] Step 1: Add 1.3500g FeCl 3 ·6H 2 O was dissolved in 40 mL of ethylene glycol, and 3.6000 g of CH was added 3 COONa·3H 2 O and 1.0000g polyethylene glycol 2000, after mixing evenly, adopt one-step hydrothermal method to react at 200°C for 8 hours, separate the product by magnetic separation, wash with water and alcohol for many times, and obtain a magnetic black powder after vacuum drying. 3 o 4 nanospheres.

[0037] Step 2: the 0.5gFe obtained in the above step 1 3 o 4 Nanospheres and 1gPVP were dispersed in 200mL deionized water and stirred evenly, and then the product was separated by magnetic separation, and the obtained activated Fe 3 o 4 The nanospheres were washed repeatedly with deionized water and absolute ethanol, and dried at 60 °C for 24 h.

[0038] Step 3: First prepare a mixed solution of 80mL of absolute ethanol, 20mL of deionized water and 2mL of ammonia water, and then add 0.2g of activated Fe 3 o 4 The nanospheres were dispersed in the above m...

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Abstract

The invention relates to the field of new materials, in particular to a hollow core-shell structure Fe3O4@SiO2@PANI wave-absorbing agent and a preparation method. The preparation method comprises the following steps of 1, preparing Fe3O4 nanospheres, 2, activating the Fe3O4 nanospheres, 3, preparing Fe3O4@SiO2 with a core-shell structure, 4, purifying aniline monomers, and 5, preparing a Fe3O4@SiO2@PANI composite material. The preparation method provided by the invention is simple and convenient to operate, controllable in experimental condition, low in cost and suitable for various core-shell structure materials, experimental steps are reduced, the preparation method can be widely applied to preparation of multi-component core-shell structure wave-absorbing materials, the obtained Fe3O4@SiO2 / PANI composite material is clear in hollow core-shell structure, and nanoparticles are spherical.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a hollow core-shell structure Fe 3 o 4 @SiO 2 @PANI wave absorbing agent and its preparation method. Background technique [0002] The rapid development of electronic information technology has brought great convenience to people's production and life with electronic equipment such as satellite communications, mobile phones, and radars. However, electromagnetic pollution caused by electromagnetic wave radiation and interference has greatly endangered the living environment of human beings. . Therefore, absorbing materials are widely used in both military and civilian applications. In the military, the wide application of radar survey technology has greatly threatened national security. Therefore, stealth technology can be used to defend against radar identification, positioning and tracking, and improve the survivability of weapons and equipment on the battlefield. For civil use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00H01Q17/00B01J13/02
CPCH05K9/0081H01Q17/00B01J13/02
Inventor 丁娟程立刚吴宝龙庄昕
Owner ZHONGYUAN ENGINEERING COLLEGE
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