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Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof

A micro-nano material, three-dimensional technology, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., to achieve the effect of simple and easy process, easy to master, and good reaction reproducibility

Active Publication Date: 2011-09-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to assemble low-dimensional nanostructure units into three-dimensional (3D) advanced micro-nanostructures, especially for composite metal oxides, is currently a great challenge

Method used

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  • Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof
  • Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof
  • Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0035] 1. Preparation of precursors

[0036] Add ferric salt and divalent cobalt salt with a total concentration of 25-35mM and a molar ratio of 2:1 to ethylene glycol, stir it electromagnetically to become a transparent liquid, heat the oil bath to 200-230°C, and react for 50-70 minutes , cooled to room temperature, and collected the precipitate. The precipitate is centrifuged and washed four times with ethanol, and dried at 60-80° C. for 6-8 hours to obtain a cobalt ferrite precursor.

[0037] 2. Target product

[0038] The precursor is heated from room temperature to 350°C for 2-3 hours in a tube furnace with an air flow rate of 50-60ml / min at a heating rate of 20-30°C / min to obtain the target product.

Embodiment 1

[0040] (1) Preparation of precursors

[0041] Add iron and cobalt nitrates with a total concentration of 30 mM into 180 mL of ethylene glycol at a molar ratio of 2:1, stir electromagnetically, heat the oil bath to 230° C., and stop the reaction after 60 minutes. Cool to room temperature, centrifuge and wash the precipitate 4 times with absolute ethanol, and dry it in a drying oven at 80°C for 6 hours to obtain the precursor, the CoFe 2 o 4 Large-scale SEM photographs of precursors such as figure 1 As shown, its high-resolution SEM photos are shown as figure 2 shown.

[0042] (2)CoFe 2 o 4 preparation of

[0043] The air in the tube furnace is 60ml / min, and at a heating rate of 30°C / min, the precursor is burned from room temperature to 350°C for 2 hours to obtain the monodisperse target product CoFe 2 o 4 , the CoFe 2 o 4 The side and front TEM photographs of image 3 and Figure 4 shown.

[0044] The CoFe prepared in this embodiment 2 o 4 The XRD pattern of F...

Embodiment 2

[0047] (1) Preparation of precursors

[0048] Add ferric trichloride and cobalt dichloride with a total concentration of 30 mM to 180 mL of ethylene glycol at a molar ratio of 2:1, stir electromagnetically, heat the oil bath to 230° C., and stop the reaction after 60 minutes. After cooling to room temperature, the precipitate was centrifuged and washed 4 times with absolute ethanol, and dried in a drying oven at 80° C. for 6 hours to obtain the precursor.

[0049] (2)CoFe 2 o 4 preparation of

[0050] The air in the tube furnace is 60ml / min, and at a heating rate of 30°C / min, the precursor is burned from room temperature to 350°C for 2 hours to obtain the monodisperse target product CoFe 2 o 4 .

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Abstract

The invention discloses a three-dimensional micro-nano material composed of nano CoFe2O4 and a preparation method thereof. The three-dimensional micro-nano material is of a double-hexagon flower dumbbell type opposite-connected structure and is obtained by the following steps: 1) adding tervalent iron salt and divalent cobalt salt in polyol, stirring to obtain transparent liquid, heating for reacting, and then cooling to room temperature and collecting precipitates; 2) centrifugally washing the precipitates with ethanol, and drying so as to obtain a yellow green cobalt ferrite precursor; and 3) firing the precursor so as to obtain the CoFe2O4 micro-nano structure with the double-hexagon flower dumbbell type opposite-connected structure. According to the invention, the process is simple and practicable, the distribution range of the obtain material particle is narrow, and the micro-nano material has the advantages of single dispersibility, single product phase and good reaction repeatability; and the synthesized material simultaneously has characteristics and advantages of a micro-nano structure and a nano structure.

Description

technical field [0001] The invention belongs to the field of preparation of magnetic metal oxide micro / nano structure materials, and relates to a 2 o 4 The formed three-dimensional micro-nano material and its preparation method are specifically a kind of micro / nano structure material and preparation method of magnetic cobalt ferrite self-assembled double hexagonal flower dumbbell couplet. Background technique [0002] AB 2 o 4 As one of the representatives of the cubic crystal system, type iron-based spinel is a kind of composite oxide mainly composed of Fe(III) oxide, in which the divalent cation A fills 1 / 8 of the tetrahedral voids. The trivalent Iron ions fill in 1 / 2 of the octahedral gaps, the octahedrons share edges, and the octahedrons share the tops with the tetrahedrons. This unique structure has achieved many superior properties of ferrite. [0003] Studies have shown that CoFe 2 o 4 It has high saturation magnetization and magnetocrystalline anisotropy, exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/32H01F1/34B81C1/00B82B3/00
Inventor 苏贵金贾漫珂郑明辉刘文彬
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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