A kind of monodisperse ferrite micro-nano sheet and preparation method thereof

A ferrite, micro-nano technology, applied in the field of nanocomposite, achieves the effects of good dispersion, high efficiency, and easy industrial application and promotion

Active Publication Date: 2022-05-06
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is currently possible to effectively prepare two-dimensional Fe with monodispersity and good uniformity. 3 o 4 There are few methods for nanomaterials, so the development of green, simple and low-cost methods to prepare Fe with good dispersion and adjustable size 3 o 4 Nanosheets have important research significance

Method used

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  • A kind of monodisperse ferrite micro-nano sheet and preparation method thereof
  • A kind of monodisperse ferrite micro-nano sheet and preparation method thereof
  • A kind of monodisperse ferrite micro-nano sheet and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 50mL ethylene glycol, 2.425g (0.1mol / L) Bi(NO 3 ) 3 ·6H 2 O, 1.352g (0.1mol / L) FeCl 3 ·6H 2 O was added to the beaker one by one and stirred for 30 minutes. Add 200 mL of distilled water to the beaker and stir for 10 minutes, then add 5.5 mL of concentrated ammonia water dropwise, collect the precipitate by centrifugation, transfer the precipitate to the inner liner, add 40 mL of distilled water (concentration is 0.125 mol / L) and 8 g of NaOH (alkali and iron The ratio of the amount of salt to substance is 40) mixing and stirring for 0.5h. Finally, the lining was put into a stainless steel kettle to react at 140°C for 24 hours, cooled, washed by centrifugation, and dried at 80°C for 2 hours to obtain the desired monodisperse micro-nanosheets. The phase, elemental composition and morphology of the obtained product observed under the scanning electron microscope are as follows: Figure 1-3 shown. The product is Bi 2 Fe 4 o 9 、BiFeO 3 and Bi 46 Fe 2 o 72 , the...

Embodiment 2

[0030] Same step as Example 1, but the hydrothermal reaction time is 12h. The atomic ratio of Fe:Bi:O is 43:9:48, and the morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 4 As shown, the obtained product is a quadrilateral micro-nano sheet with a side length of 530-890 nm and a thickness of 40-100 nm.

Embodiment 3

[0032] Same step as Example 1, but the hydrothermal reaction time is 48h. The atomic ratio of Fe:Bi:O is 37.3:14.2:48.5, and the morphology of the obtained product observed under the scanning electron microscope is as follows: Figure 5 As shown, the obtained product is a quadrilateral micro-nano sheet with a side length of 0.46-1.02 μm and a thickness of 40-120 nm.

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Abstract

The invention relates to a monodisperse ferrite micro-nano sheet and a preparation method thereof. The composition of the micro-nano sheet is transition metal element-doped ferrite or iron oxide; the bismuth-doped ferrite micro-nano sheet is a regular quadrilateral with a side length of 0.26-1.85 μm and a thickness of 20-240 nm, bismuth element The doping atomic percentage is 0-14.2%; the barium or strontium element-doped iron oxide micro-nano sheet is circular, with a diameter of 1.48μm-18.32μm and a thickness of 0.16-3.54μm, barium or strontium element doping The atomic percentage is 0 to 3.3%. The micro-nano sheet is prepared by co-precipitation-hydrothermal method, and the composition, morphology and size of the particle can be regulated by adjusting the ratio of the transition metal salt. The method has the advantages of cheap and easy-to-obtain raw materials, low cost, simple process, low requirements on equipment, high efficiency, and easy promotion; magnetic microchips have the characteristics of monodispersity and uniformity, and adjustable morphology and composition. , electrode materials, pigments, microwave absorption or high-density magnetic recording materials have broad application prospects.

Description

technical field [0001] The invention relates to the field of nanocomposite technology, in particular to a simple method for preparing monodisperse ferrite micro-nano sheets. Background technique [0002] Ferrite is an important non-metallic magnetic material, which has developed rapidly since the 1940s, and has been widely used in the fields of magnetic fluid, electronic devices, drug delivery technology, information storage, magnetic resonance imaging, and protein adsorption There are a wide range of applications. From a magnetic point of view, the lowest energy state of a magnetic nanomaterial mainly depends on its size, shape, strength, and anisotropy characteristics, which in turn determine its magnetic properties. [0003] Two-dimensional micro-nanosheets have novel optical, electrical, and magnetic properties due to their unique shape anisotropy. The methods for synthesizing flake ferrite mainly include high temperature pyrolysis, ball milling, co-precipitation, micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G49/00C01P2006/42C01P2004/62C01P2004/04C01P2004/03C01P2002/72
Inventor 童国秀刘琳何茹徍程锦绣胡潘斌宫培军乔儒吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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