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Three-dimensional micro-nano material composed of nano CoFe2O4 and preparation method thereof
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A micro-nano material, three-dimensional technology, applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., to achieve the effect of easy mastery, low technical difficulty and good response reproducibility
Active Publication Date: 2013-05-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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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
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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 temperature is raised from room temperature to 350°C and the precursor is burned 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 ...
Embodiment 2
[0047] (1) Preparation of precursors
[0048] Add ferric trichloride and cobalt dichloride 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. 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 temperature is raised from room temperature to 350°C and the precursor is burned 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...
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Patent Type & Authority Patents(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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