Preparation method of hollow Fe/Fe3O4@SiO2 nanostructure with adjustable wave-absorbing property

A technology with wave absorbing properties and nanostructures is applied in the field of preparation of hollow Fe/Fe3O4SiO2 nanostructures to achieve the effects of low cost and simple process operation.

Inactive Publication Date: 2013-08-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many ways to synthesize Fe 3 o 4 SiO 2 Core-shell structure, but hollow Fe/

Method used

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  • Preparation method of hollow Fe/Fe3O4@SiO2 nanostructure with adjustable wave-absorbing property
  • Preparation method of hollow Fe/Fe3O4@SiO2 nanostructure with adjustable wave-absorbing property
  • Preparation method of hollow Fe/Fe3O4@SiO2 nanostructure with adjustable wave-absorbing property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1), hollow Fe 3 o 4 Preparation and pretreatment of nanoparticles

[0029] Ferric chloride hexahydrate as raw material, ethylene glycol as solvent and reducing agent, NH 4 Ac was used as a structure-directing agent, and a hollow Fe with a size of about 340 nm was prepared by solvothermal reaction at 200 °C for 12 h 3 o 4 nanoparticles, 0.2 g of Fe 3 o 4 Nanoparticles were sonicated in 0.1 mol / L hydrochloric acid solution for 10 min, then separated and washed;

[0030] 2), using the improved St?ber method to prepare Fe 3 o 4 SiO 2 nanocomposite particles

[0031] Fe treated with hydrochloric acid solution 3 o 4 Nanoparticles were dispersed in 100 mL of a mixed solution of absolute ethanol and water at a ratio of 4:1, the pH of the solution was adjusted to 10, and 2 mL of ethyl orthosilicate was added dropwise under mechanical stirring at room temperature. ester (TEOS), stirred for 12 h, after the reaction, washed with distilled water and dried in vacuum to ob...

Embodiment 2

[0035] 1), hollow Fe 3 o 4 Preparation and pretreatment of nanoparticles (same as Example 1)

[0036] 2), using the improved Stäber method to prepare Fe 3 o 4 SiO 2 nanocomposite particles

[0037] Fe treated with hydrochloric acid solution 3 o 4 Nanoparticles were dispersed in 100 mL of a mixed solution of absolute ethanol and water at a ratio of 4:1, the pH of the solution was adjusted to 10, and 2 mL of ethyl orthosilicate was added dropwise under mechanical stirring at room temperature. ester (TEOS), stirred for 8 h, after the reaction, washed with distilled water and dried in vacuum to obtain hollow Fe with core-shell structure 3 o 4 / SiO 2 nanocomposites;

[0038] 3) Preparation of Fe / Fe by high temperature reduction method 3 o 4 SiO 2 Nano composite material (same as embodiment 1)

Embodiment 3

[0040] 1), hollow Fe 3 o 4 Preparation and pretreatment of nanoparticles (same as Example 1)

[0041] 2), using the improved Stäber method to prepare Fe 3 o 4 SiO 2 nanocomposite particles

[0042] Fe treated with hydrochloric acid solution 3 o 4 Nanoparticles were dispersed in 100 mL of a 4:1 mixed solution of absolute ethanol and water, and the pH of the solution was adjusted to 10. At room temperature, 4 mL of ethyl orthosilicate was added dropwise under mechanical stirring. ester (TEOS), stirred for 12 h, after the reaction, washed with distilled water and dried in vacuum to obtain hollow Fe with core-shell structure 3 o 4 / SiO 2 nanocomposites;

[0043] 3) Preparation of Fe / Fe by high temperature reduction method 3 o 4 SiO 2 Nano composite material (same as embodiment 1)

[0044] Hollow Fe / Fe of the present invention 3 o 4 SiO 2 Reflection loss of nanostructured tunable material at low and high frequencies, SiO 2 The thickness of the shell can be control...

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Abstract

The invention discloses a preparation method of a hollow Fe/Fe3O4@SiO2 nanostructure with adjustable wave-absorbing property. The preparation method comprises the following steps of: preparing 340-nanometer hollow Fe3O4 nanoparticles by a simple solvothermal method; performing ultrasonic treatment on Fe3O4 in hydrochloric acid, and separating and washing; dispersing the Fe3O4, which is treated with hydrochloric acid, into absolute ethanol and aqueous solution, adjusting the pH value to 10, dropwise adding ethyl orthosilicate step by step at room temperature, reacting while stirring, washing with distilled water and performing vacuum drying to obtain a Fe3O4/SiO2 nanocomposite material with a core-shell structure; and heating the Fe3O4/SiO2 composite material in a tube furnace to 723 K, reducing for 6 hours under heat insulating condition, and cooling to room temperature to obtain the hollow Fe/Fe3O4@SiO2 nanostructure with adjustable wave-absorbing property. Equipment required by the method is simple, easy to operate, suitable for industrial production and convenient to recover.

Description

technical field [0001] The invention belongs to the field of magnetic wave-absorbing materials, in particular to hollow Fe / Fe with adjustable wave-absorbing properties 3 o 4 SiO 2 Preparation methods of nanostructures. Background technique [0002] Absorbing materials are an important part of functional materials. With the continuous development of electromagnetic wave detection technology, how to effectively reduce the enemy's electromagnetic detection signal and improve the survivability of the weapon system itself has become an important issue in the development of weapons. The current development of absorbing materials The main body of ferrite is still magnetic material. As a traditional magnetic material, ferrite is cheap and has good chemical stability. It is the earliest and relatively mature absorbing material. The ferrite absorber has a high resistivity, which can avoid the skin effect of metal conductors at high frequencies, and can effectively enter electromagn...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 姬广斌郑晶林小慧
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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