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Magnetic micro-nano sheet, and preparation method and application thereof

A micro-nano, magnetic technology, applied in the field of magnetic nano, to achieve the effect of broad application prospects, strong magnetic response, and strong microwave absorption performance

Active Publication Date: 2015-12-09
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent literature (CN101717122A) discloses a microwave method to prepare ferric oxide nanosheets, which is simple and efficient, but uses a surfactant, and the prepared product is a flower composed of nanosheets, rather than monodisperse ferric oxide. TriFe Nanosheets

Method used

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  • Magnetic micro-nano sheet, and preparation method and application thereof
  • Magnetic micro-nano sheet, and preparation method and application thereof
  • Magnetic micro-nano sheet, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 4mmolFeCl 3 ·6H 2O, 3.0mL distilled water and 37.0mL absolute ethanol were added to the polytetrafluoroethylene lining, and magnetically stirred for 5min to obtain a transparent solution. Add 40mmol of sodium acetate (the ratio of alkali to metal salt is 10) into the lining and mix and stir for 30min. Finally, put the lining into a stainless steel kettle and react at 180°C for 12 hours, and then wash it by centrifugation after cooling. Dry at 60°C for 6h to obtain the desired monodisperse nanosheets. The resulting product is brick red, and the phase of the product and the morphology observed under the scanning electron microscope are as follows: Figure 1-2 shown. It can be seen that the product is hexagonal α-Fe 2 o 3 The diameter of the nanosheet (which is the diameter of the circumscribed circle of the hexagon) is 121-173 nm, and the thickness is about 10 nm.

[0033] Weigh 10 mg of sample into a 100 ml small beaker, measure 50 mL of 0.02 mmol / L rhodamine B so...

Embodiment 2

[0035] The procedure is the same as in Example 1, but distilled water is 1.0 mL, and absolute ethanol is 39.0 mL. The resulting product is brick red, and the morphology observed under the scanning electron microscope is as follows: image 3 As shown, it can be seen that the reduction of the amount of water leads to α-Fe 2 o 3 The diameter of the hexagonal nanosheets increases to 355-868nm, and the thickness is about 30nm.

Embodiment 3

[0037] The procedure is the same as in Example 1, but the volume of distilled water is 4.0 mL, and that of absolute ethanol is 36.0 mL. The resulting product is brick red, and the morphology observed under the scanning electron microscope is as follows: Figure 4 As shown, it can be seen that the increase of water amount leads to α-Fe 2 o 3 The diameter of the hexagonal nanosheets is reduced to 83-120 nm, and the thickness is about 15 nm.

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Abstract

The invention discloses a magnetic micro-nano sheet, and a preparation method and an application thereof. The magnetic micro-nano sheet is a dimension-adjustable alpha-Fe2O3 or Fe3O4 micro-nano sheet with good dispersion and homogeneity. The alpha-Fe2O3 micro-nano sheet is prepared through a mixed solvent thermal technology, and the dimension and the morphology of the micro-nano sheet are regulated through changing the volume of water, the reactant concentration, a molar ratio of an alkali to a metal salt and the type of the alkali (the diameter of a hexagonal or subround nano-sheet is 60-510nm, and the thickness of the hexagonal or subrotund nano-sheet is 8-30nm; and the diameter of an irregular micro-sheet is 2-16[mu]m, and the thickness of the irregular micro-sheet is 0.35-1[mu]m). The alpha-Fe2O3 is converted into the Fe3O4 micro-nano sheet with strong magnetism and excellent microwave absorption performance through a carbon thermal reduction process. The preparation method has the advantages of no need of a surfactant, simple preparation process, cheap and easily available raw materials, low cost, high output, and easy industrial application and popularization. The micro-nano sheet provided by the invention has application prospects in fields of photocatalysis, microwave absorption, electrode materials, magnetic record materials, sensors and biomedical engineering.

Description

technical field [0001] The invention relates to the field of magnetic nanotechnology, in particular to a simple and controllable method for preparing magnetic micro-nano sheets. Background technique [0002] α-Fe 2 o 3 and Fe 3 o 4 Because of its stability, low toxicity, abundant reserves, and low price, it has become the most important two types of iron oxides. α-Fe 2 o 3 It is an n-type semiconductor material with a band gap of 2.1V, and has wide potential applications in the fields of inorganic pigments, catalysts, electrode materials, sensors, etc. Fe 3 o 4 is a traditional magnetic material, nanoscale Fe 3 o 4 It has electrical and magnetic properties related to size and shape, such as single magnetic domain characteristics, coercive force changes with size, low Curie temperature and superparamagnetism, making it suitable for magnetic recording, microwave absorption, sensors, and bioseparation , biological diagnosis, targeted drug delivery and other fields ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/06C01G49/08
CPCC01G49/06C01G49/08C01P2002/72C01P2004/03C01P2004/20C01P2004/24C01P2006/42
Inventor 童国秀刘云吕天喜吴文华
Owner ZHEJIANG NORMAL UNIVERSITY
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