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ZnFe2O4@SiO2@RGO wave absorbent and preparation process thereof

A preparation process, znfe2o4 technology, applied in other chemical processes, magnetic/electric field shielding, electrical components, etc., can solve problems such as reinforced composites, achieve great application prospects, mild preparation conditions, and simple methods

Inactive Publication Date: 2017-06-20
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Good wave-transmitting properties are also indispensable for excellent wave-absorbing agents. Ceramics, glass and fibers are the most popular wave-transmitting materials, among which SiO 2 The most widely used; if SiO 2 As a bridge between ferrite and graphene, it can not only greatly enhance the wave-transmitting performance of the composite, but also increase the magnetic core and SiO 2 Between, SiO 2 The interface interaction with the RGO shell further improves the electromagnetic wave absorption performance of the composite, and its related reports are rare

Method used

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  • ZnFe2O4@SiO2@RGO wave absorbent and preparation process thereof
  • ZnFe2O4@SiO2@RGO wave absorbent and preparation process thereof
  • ZnFe2O4@SiO2@RGO wave absorbent and preparation process thereof

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Weigh 1.352g FeCl 3 ·6H 2 O and 0.341g ZnCl 2 Dissolve in 40 mL of ethylene glycol solution, then add 0.500 g of trisodium citrate and 3.600 g of anhydrous NaAc, and stir ultrasonically for 0.5 hours. The obtained yellow clear liquid was transferred into a stainless steel reaction kettle, reacted at 150° C. for 8 hours, cooled naturally to room temperature, and filtered. The solid phase was washed three times with deionized water and ethanol respectively, and the solid phase was dispersed in 50 mL of ethanol-water mixed solvent (volume ratio of deionized water and absolute ethanol was 1:1), and 1 mL of NH 3 ·H 2 O, stir evenly, and record it as mixed solution A; take another 0.4mL tetraethyl orthosilicate (TEOS) solution and disperse it in 20mL absolute ethanol, and record the obtained solution as B. The solution B was added dropwise to the mixture A using a constant pressure dropping funnel, and the mixture was continuously stirred at room temperature for 8 hou...

Embodiment 2

[0034] (1) Weigh 2.702g FeCl 3 ·6H 2 O and 0.682g ZnCl 2 Dissolve in 60 mL of ethylene glycol solution, then add 1.000 g of trisodium citrate and 7.200 g of anhydrous NaAc, and stir ultrasonically for 1 hour. Prepare mixed solution A according to the method of step (1) of Example 1 (in 100mL ethanol-water mixed solvent (deionized water and absolute ethanol volume ratio 1:1), 2mL NH 3 ·H 2 O); Another 0.4mL tetraethyl orthosilicate (TEOS) solution was dispersed in 40mL absolute ethanol, and the resulting solution was denoted as B. Prepare ZnFe by the method of the step (1) of embodiment 1 2 o 4 @SiO 2 binary complex.

[0035] (2) Weigh 0.6g expandable graphite (EG) and 6.0g KMnO 4 Place in a 500mL three-necked flask, stir and mix evenly, slowly add 100mL of concentrated H 2 SO 4 and 15 mL concentrated H 3 PO 4 The mixed solution, prepare suspension A (RGO content is about 2mg / mL) by the method for embodiment 1 step (2); 0.4g ZnFe 2 o 4 @SiO 2 The complex was diss...

Embodiment 3

[0039] (1) Weigh 4.055g FeCl 3 ·6H 2 O and 1.023g ZnCl 2 Dissolve in 90mL ethylene glycol solution, then add 1.500g trisodium citrate and 10.800g anhydrous NaAc, and stir ultrasonically for 1 hour. Prepare mixed solution A according to the method of step (1) of Example 1 (in 150mL ethanol-water mixed solvent (deionized water and absolute ethanol volume ratio 1:1), 3mL NH 3 ·H 2 O); Another 0.4mL tetraethyl orthosilicate (TEOS) solution was dispersed in 40mL absolute ethanol, and the resulting solution was denoted as B. Prepare ZnFe by the method of the step (1) of embodiment 1 2 o 4 @SiO 2 binary complex.

[0040] (2) Weigh 0.9g expandable graphite (EG) and 9.0g KMnO 4 Place in a 500mL three-necked flask, stir and mix evenly, slowly add 150mL concentrated H 2 SO 4 and 20 mL concentrated H 3 PO 4 The mixed solution, prepare suspension A (RGO content is about 3mg / mL) by the method for embodiment 1 step (2); The ZnFe of 0.6g 2 o 4 @SiO 2 The complex was dissolved i...

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Abstract

A ZnFe2O4@SiO2@RGO wave absorbent is obtained by compounding a ZnFe2O4@SiO2@RGO ternary complex and paraffin, wherein the ZnFe2O4@SiO2@RGO ternary complex is obtained by compounding magnetic loss zinc ferrite (ZnFe2O4), conductive and dielectric loss graphene (RGO) and SiO2 with favorable wave transmissivity. The wave absorbent has the minimum reflection loss of -43.9 dB within the range of 2-18 GHz, and the absorption bandwidth of smaller than 10 dB exceeds 6 GHz. The ZnFe2O4@SiO2@RGO wave absorbent is simple in preparation method, mild in preparation condition, pollution-free in preparation process and easy for realizing batch production, and therefore, has a good application prospect in such fields as electromagnetic wave shielding and absorption and stealth materials.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and specifically refers to the composition and preparation process of an electromagnetic wave absorber with an anti-electromagnetic interference effect. Background technique [0002] With the rapid development of modern science and electronic technology, the problem of electromagnetic radiation has become another major pollution problem after water pollution and air pollution. Electromagnetic wave absorber (wave absorber) is a functional material that can effectively solve electromagnetic pollution, absorb electromagnetic waves, and reduce electromagnetic wave reflection and transmission. An ideal electromagnetic wave absorbing material must have the characteristics of light weight, small thickness, wide absorption frequency band and stable chemical properties. Among various electromagnetic wave absorbing materials, ferrite has always been the focus of scientists because of its abundant raw mat...

Claims

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Application Information

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IPC IPC(8): C08L91/06C08K9/10C08K3/24C08K3/36C08K7/24C08K3/04C09K3/00H05K9/00
CPCC08L91/06C08K3/04C08K3/24C08K3/36C08K7/24C08K9/10C09K3/00H05K9/0081
Inventor 李良超冯建涛侯艳辉
Owner ZHEJIANG NORMAL UNIVERSITY
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