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Method for preparing porous flower-shape-structured ferroferric oxide wave absorbing material

A technology of triiron tetroxide and flower-like structure, which is applied in the direction of iron oxide/iron hydroxide, ferrous iron oxide, etc., can solve the problems of toxicity, hazards, yields, etc., and achieve improved wave-absorbing performance, reduced material density, The effect of large specific surface area

Inactive Publication Date: 2015-12-30
PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods are feasible, they all require surfactant or organic solvent-assisted synthesis, which has toxicity hazards and low yields.

Method used

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  • Method for preparing porous flower-shape-structured ferroferric oxide wave absorbing material
  • Method for preparing porous flower-shape-structured ferroferric oxide wave absorbing material
  • Method for preparing porous flower-shape-structured ferroferric oxide wave absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) the anhydrous ferric chloride of 10mmol, i.e. FeCl 3 and 100mmol urea were added to 50ml of ethylene glycol solution, wherein the molar ratio of anhydrous ferric chloride and urea was 1:10, and the molar concentration of urea was 2.0mol / L, and mixed solution A was obtained after fully stirring and dissolving;

[0038](2) Put the mixed solution A described in step (1) into the reaction kettle, react at 220°C for 2 hours, wash and dry to obtain the granular precursor B;

[0039] (3) Under the protection of inert gas nitrogen, the granular precursor B obtained in step (2) is heated to 380° C. and kept for 5 hours, and then cooled to room temperature;

[0040] (4) a porous flower-like structure ferric oxide material, prepared by the above method, such as figure 2 shown.

Embodiment 2

[0042] (1) the anhydrous ferric chloride of 10mmol, i.e. FeCl 3 And 160mmol urea is joined in the ethylene glycol solution of 100ml, wherein the molar ratio of anhydrous ferric chloride and urea is 1:16, and the molar concentration of urea is 1.6mol / L, obtain mixed solution A after fully stirring and dissolving;

[0043] (2) Put the mixed solution A described in step (1) into the reaction kettle, react at 200°C for 4 hours, wash and dry to obtain the granular precursor B;

[0044] (3) Under the protection of inert gas nitrogen, the granular precursor B obtained in step (2) is heated to 400°C and kept for 1.5h, and then cooled to room temperature;

[0045] (4) a porous flower-like structure ferric oxide material, prepared by the above method, such as Figure 3~6 shown.

Embodiment 3

[0047] (1) the anhydrous ferric chloride of 15mmol, i.e. FeCl 3 And 180mmol urea is added in the ethylene glycol solution of 100ml, wherein the molar ratio of anhydrous ferric chloride and urea is 1:12, and the molar concentration of urea is 1.8mol / L, obtain mixed solution A after fully stirring and dissolving;

[0048] (2) Put the mixed solution A described in step (1) into the reaction kettle, react at 180°C for 6 hours, wash and dry to obtain the granular precursor B;

[0049] (3) Under the protection of inert gas nitrogen, the granular precursor B obtained in step (2) was heated up to 450° C. and kept for 3 hours, and then cooled to room temperature.

[0050] (4) A ferric oxide material with a porous flower-like structure, which is prepared by the above method.

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Abstract

The invention discloses a method for preparing a porous flower-shape-structured ferroferric oxide wave absorbing material. The method comprises the following specific steps: (1) adding anhydrous ferric chloride and urea into an analytically-pure ethylene glycol solution, and carrying out fully-stirred dissolution, so as to obtain a mixed solution A, wherein the mole ratio of anhydrous ferric chloride to urea is 1: (4 to 16), and the content of urea in the glycol solution is 0.5-2mol / L; (2) putting the mixed solution A obtained in the step (1) into a reactor, carrying out solvothermal reaction, i.e., carrying out reaction for 2-10 hours at the temperature of 150-220 DEG C, cooling the reaction product to room temperature, and then, cleaning and drying the reaction product, so as to obtain a granular precursor B; and (3) heating the granular precursor B obtained in the step (2) to the temperature of 350-500 DEG C under the protection of inert gas, keeping the temperature for 1-5 hours so as to decompose the granular precursor B, and then, cooling the decomposed product to room temperature, thereby obtaining the porous flower-shape-structured ferroferric oxide wave absorbing material. The method has the advantages that the method is simple, economical and environment-friendly, the morphology is controllable, and the assistance of soft and hard templates is not required.

Description

technical field [0001] The invention relates to the field of manufacturing a wave-absorbing material, in particular to a method for preparing a wave-absorbing material of iron ferric oxide with a porous flower-like structure. Background technique [0002] With the rapid development of modern science and technology such as computers and communications, technologies such as electromagnetic compatibility and electromagnetic protection have become particularly important. Wave-absorbing materials are one of the key materials in the above-mentioned technical fields. The department's electronic equipment plays an important role in preventing information leakage and preventing electromagnetic interference. The development and application of wave-absorbing material technology is also one of the key technologies in the field of stealth technology. At the same time, with the increasing pollution of electromagnetic waves, the research on absorbing materials will also play a positive ro...

Claims

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Application Information

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IPC IPC(8): C01G49/08
CPCC01G49/08C01P2002/72C01P2002/77C01P2002/85C01P2002/88C01P2004/03C01P2004/04C01P2004/20C01P2004/30C01P2004/61C01P2006/12C01P2006/17C01P2006/42
Inventor 王小亮孙宏宇王庆国白丽云曲兆明王平平王献芬李继勇
Owner PEOPLES LIBERATION ARMY ORDNANCE ENG COLLEGE
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