Bell-shaped Fe3O4@void@SiO2 nano-chain and preparation method

A nano-chain, core-shell technology, used in the preparation of microspheres, microcapsule preparations, coatings, etc., to achieve excellent microwave absorption performance, enhance multiple absorption, and facilitate dissipation.

Active Publication Date: 2018-01-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many microwave absorbing materials with strong absorption have emerge

Method used

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  • Bell-shaped Fe3O4@void@SiO2 nano-chain and preparation method
  • Bell-shaped Fe3O4@void@SiO2 nano-chain and preparation method
  • Bell-shaped Fe3O4@void@SiO2 nano-chain and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Core-shell Fe 3 o 4 Preparation of @P(DVB-MAA) nanochains: 0.028g of Fe 3 o 4Particles, 0.26g of monomer methacrylic acid MAA, 0.08g of crosslinking agent divinylbenzene DVB were added to 80mL of acetonitrile, dispersed uniformly by ultrasound, and then added 1.6wt% of the total amount of monomer and crosslinking agent The initiator azobisisobutyronitrile (AIBN) was subjected to distillation and precipitation polymerization induced by an external magnetic field at a water bath temperature of 80 ° C. After 1 hour of reaction, the core-shell Fe 3 o 4 @P(DVB-MAA) nano chain;

[0031] Step 2, double shell Fe 3 o 4 @P(DVB-MAA)@SiO 2 Preparation of nanochains: the core-shell Fe 3 o 4 @P(DVB-MAA) nanochains were dispersed in a mixed solvent of 73mL ethanol and 7mL water; then 1.8mL of 25% ammonia water was added, and mechanically stirred for 1 hour to make the solution evenly mixed; slowly dropwise added 0.09g of orthosilicic acid Ethyl ester, react at room t...

Embodiment 2

[0038] Step 1. Core-shell Fe 3 o 4 Preparation of @P(DVB-MAA) nanochains: 0.3g of Fe 3 o 4 Particles, 0.3g of monomeric methacrylic acid MAA, 0.09g of crosslinking agent divinylbenzene DVB were added to 100mL of acetonitrile, dispersed uniformly by ultrasound, and then 1.9wt% of the total amount of monomer and crosslinking agent was added The initiator azobisisobutyronitrile (AIBN) was subjected to distillation and precipitation polymerization induced by an external magnetic field at a water bath temperature of 85 °C, and the core-shell Fe was obtained after 1.5 hours of reaction. 3 o 4 @P(DVB-MAA) nano chain;

[0039] Step 2, double shell Fe 3 o 4 @P(DVB-MAA)@SiO 2 Preparation of nanochains: the core-shell Fe 3 o 4 @P(DVB-MAA) nanochains were dispersed in a mixed solvent of 72mL ethanol and 8mL water; then 1.6mL of 28% ammonia water was added, and mechanically stirred for 1.5 hours to make the solution evenly mixed; slowly dropwise added 0.1g of methyl orthosilicate ...

Embodiment 3

[0042] Step 1. Core-shell Fe 3 o 4 Preparation of @P(DVB-MAA) nanochains: 0.026g of Fe 3 o 4 Particles, 0.3g of monomer methacrylic acid MAA, 0.08g of crosslinking agent divinylbenzene DVB were added to 90mL of acetonitrile, dispersed uniformly by ultrasound, and then added 1.6wt% of the total amount of monomer and crosslinking agent The initiator benzoyl peroxide (BPO) was subjected to distillation and precipitation polymerization induced by an external magnetic field at a water bath temperature of 80°C, and the core-shell Fe was obtained after 1 hour of reaction. 3 o 4 @P(DVB-MAA) nano chain;

[0043] Step 2, double shell Fe 3 o 4 @P(DVB-MAA)@SiO 2 Preparation of nanochains: the core-shell Fe 3 o 4 @P(DVB-MAA) nanochains were dispersed in a mixed solvent of 72mL ethanol and 8mL water; then 2.0mL of 28% ammonia water was added, and mechanically stirred for 1.5 hours to make the solution evenly mixed; Ester, react at room temperature for 6 hours; freeze-dry after mag...

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Abstract

The invention relates to a bell-shaped Fe3O4@void@SiO2 nano-chain and a preparation method. Under the induction action of an external magnetic field, magnetic Fe3O4 nano-particles are assembled and arranged, a polymer shell layer P (DVB-MAA) wraps the Fe3O4 nano-particles to form a core-shell Fe3O4@P (DVB-MAA) nano-chain, the Fe3O4@P (DVB-MAA) nano-chain is coated with a SiO2 shell layer by a sol-gel method, a double-shell-layer Fe3O4@P (DVB-MAA)@SiO2nano-chain is prepared, a structure of the Fe3O4@P (DVB-MAA)@SiO2nano-chain is effectively protected by the aid of recrystallization of salt, andpyrolysis is performed in the atmosphere of argon to obtain the bell-shaped Fe3O4@void@SiO2 nano-chain. Good microwave absorption property of materials is acquired by the aid of a special micro-nanostructure, a minimum reflection loss value of the materials is -45.03dB (13.57GHz), and an effective absorption frequency band can reach 5.5GHz or more. The nano-chain effectively solves the problem of narrow absorption frequency bands of existing wave-absorbing materials.

Description

technical field [0001] The invention belongs to the field of microwave absorption, in particular to a rattle-shaped Fe 3 o 4 @void @SiO 2 Nano chain and preparation method. Background technique [0002] With the rapid development of microwave and communication technologies, electronic devices such as mobile communications, computers, and household appliances are becoming more and more popular, bringing great convenience to people's work and life. At the same time, electronic equipment will release electromagnetic waves of different frequencies during the working process, which not only interferes with the normal operation of other electronic equipment, but also causes certain damage to human health, and causes different degrees of electromagnetic pollution to the surrounding environment. . It is urgent to solve the current electromagnetic pollution problem. Microwave absorbing materials can convert electromagnetic wave energy into heat energy or other forms of energy th...

Claims

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Application Information

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IPC IPC(8): B01J13/14C08F220/06C08F212/36C08F2/44C08K3/22C09D1/00
Inventor 张秋禹乔明涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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