Preparation method of polyaniline/sliver-coated/cobalt ferrite composite material

A technology of cobalt ferrite and composite materials, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of narrow microwave absorption frequency band and single absorption mechanism.

Active Publication Date: 2013-12-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of a single filler often has a single absorption mechanism and a narrow microwave absorption frequency band. In order to solve these problems, the above-mentioned va

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of CoFe 2 o 4 : Weigh 5.8210g of cobalt nitrate, 16.16g of ferric nitrate, and 16.8112g of citric acid, add them into distilled water to dissolve, then mix, add ammonia water to adjust the pH value of the solution to 7, heat it in a water bath at 90°C until the solution is colloidal, and then add The colloidal product is dried in an oven at 130°C for 5 hours, taken out and calcined in a muffle furnace at 850°C for 3 hours, and cooled naturally to obtain CoFe 2 o 4 .

[0026] to CoFe 2 o 4 For electroless silver plating: CoFe 2 o 4 Add 10% HNO by volume 3 The solution was ultrasonically treated for 5 minutes, filtered and washed with water until neutral; SnCl with a concentration of 45g / L was used 2 +HCl solution was ultrasonically treated for 5min, filtered and washed with water until neutral; 0.5g / L PdCl was used 2 The solution was sonicated for 15 minutes, filtered and washed with water until neutral. Weigh 0.01mol AgNO 3 , adding deionized wate...

Embodiment 2

[0029] CoFe 2 o 4 The preparation and electroless silver plating process are the same as embodiment 1.

[0030] PANI / Ag / CoFe 2 o 4 Preparation: Add 3ml of aniline monomer into a three-necked flask filled with 100ml of 0.1mol / L HCl solution, and stir evenly. Add 1.2g Ag / CoFe 2 o 4 and 0.2gCTAB, ultrasonically dispersed for 30min, then slowly dropwise added 50ml of HCl (0.1mol / L) solution containing 9gAPS under ice bath conditions, reacted in ice bath for 6h, washed with acetone and deionized water for 15min respectively after the reaction, Then dope again with 0.1mol / L HCl solution for 1.5h. Finally, it was vacuum-dried at 80°C for 24 hours.

Embodiment 3

[0032] CoFe 2 o 4 The preparation and electroless silver plating process are the same as embodiment 1.

[0033] PANI / Ag / CoFe 2 o 4 Preparation: Add 3ml of aniline monomer into a three-necked flask filled with 100ml of 0.1mol / L HCl solution, and stir evenly. Add 1.8g Ag / CoFe 2 o 4 and 0.2gCTAB, ultrasonically dispersed for 30min, and then slowly dropwise added 50ml of HCl (0.1mol / L) solution containing 9gAPS under ice bath conditions, reacted in ice bath for 6h, washed with acetone and deionized water for 15min respectively after the reaction, Then dope again with 0.1mol / L HCl solution for 1.5h. Finally, it was vacuum-dried at 80°C for 24 hours.

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Abstract

The invention discloses a preparation method of a polyaniline/sliver-coated/cobalt ferrite composite material. The preparation method comprises the following steps: respectively weighing three substances according to a stoichiometric ratio of cobalt nitrate to ferric nitrate to citric acid of 1:2:4: preparing cobalt ferrite (CoFe2O4) by adopting a sol-gel process; carrying out chemical silver-plating onto the prepared CoFe2O4 to obtain wave-absorbing filler with excellent electromagnetic performances; and preparing PANI (Polyaniline)/Ag/CoFe2O4 composite material by using aniline monomer and Ag/CoFe2O4 as raw materials through a chemical in-situ polymerization method. The composite material is combined with the excellent electrical performance of metal single substance Ag, the good magnetic performance of CoFe2O4 as well as good processability, stability and electrical performance of the conductive high polymer polyaniline, is a good microwave-absorbing material, and has an important application value in the microwave-absorbing field. The Ag/CoFe2O4 composite filler obtained by the preparation method disclosed by the invention is combined with the excellent electrical performance of the Ag and the good magnetic performance of the CoFe2O4, and is a good electromagnetic composite material; the PANI/Ag/CoFe2O4 prepared by using the composite material as the filler has good microwave-absorbing performance.

Description

technical field [0001] The invention relates to a preparation method of a polyaniline / silver-plated / cobalt ferrite composite material, and the prepared composite material can be used in the field of microwave absorption. Background technique [0002] Commonly used microwave absorbing materials include ferrite, conductive polymers, carbon nanomaterials, etc. Ferrite has high saturation magnetization and magnetic loss, and is the most commonly used wave-absorbing filler. Cobalt ferrite with a spinel structure has high saturation magnetization and coercive force, and is an excellent magnetic material. . Conductive polymers are mainly composed of polyaniline, polypyrrole, polythiophene, etc. Polyaniline has attracted much attention due to its low cost, simple synthesis, high electrical conductivity, and good environmental stability. [0003] The basic requirements for absorbing materials are "thin, light, wide, and high", that is, thin thickness, light weight, wide frequency b...

Claims

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Application Information

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IPC IPC(8): C08L79/02C08G73/02C08K9/02C08K3/22C08K3/08C09K3/00
Inventor 齐暑华张欣欣钟晓兰何征邱华黄英
Owner NORTHWESTERN POLYTECHNICAL UNIV
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