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Monodisperse ferrite micro-nano sheet and preparation method thereof

A ferrite, micro-nano technology, applied in the field of nano-composite, to achieve the effect of uniform particles, easy industrial application and promotion, and high efficiency

Active Publication Date: 2017-11-24
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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  • Monodisperse ferrite micro-nano sheet and preparation method thereof
  • Monodisperse ferrite micro-nano sheet and preparation method thereof
  • Monodisperse ferrite micro-nano sheet and preparation method thereof

Examples

Experimental program
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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 transition metal element doped ferrite or ferric oxide is used as the component of the micro-nano sheet; a bismuth doped ferrite micro-nano sheet is of normal square shape, the side length thereof is 0.26-1.85mu m, the thickness is 20-240nm and the percent of the bismuth doped atoms is 0-14.2%; and a barium or strontium doped ferric oxide micro-nano sheet is of circular shape, the diameter is 1.48mu m-18.32mu m, the thickness is 0.16-3.54mu m and the percent of barium or strontium doped atoms is 0.3.3%. A coprecipitation-hydrothermal method is adopted for preparing the micro-nano sheet; the composition, shape and size of the particles can be regulated and controlled in the manner of adjusting the proportion of the transition metal salt; the method has the characteristics of low-cost easily acquired raw materials, low cost, simple process, low requirement for equipment, high efficiency and easiness in popularization; and the magnetic microchip has the characteristics of high monodispersity and uniformity, adjustable morphology and composition, and the like, and has wide application prospect in catalyst, electrode materials, pigments, microwave absorption or high-density magnetic recording materials.

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 Applications(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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