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A controlled synthesis method of uranium oxide micro/nano crystals

A synthesis method and nanocrystal technology, applied in uranium dioxide, uranium oxide/hydroxide, nanotechnology, etc., can solve the problems of lack of high quality, limitation of micro-nano materials, etc., and achieve uniform size, good crystallinity, high yield effect

Active Publication Date: 2020-05-08
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the development of micro-nanocrystalline nuclear fuel is limited due to the lack of high-quality uranium oxide micro-nano materials

Method used

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  • A controlled synthesis method of uranium oxide micro/nano crystals
  • A controlled synthesis method of uranium oxide micro/nano crystals
  • A controlled synthesis method of uranium oxide micro/nano crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1a. Under slow electromagnetic stirring, dissolve uranyl acetate into a mixed solution of acetone and water, the volume percentage of acetone is 50%, to obtain solution I, and the concentration of uranyl ion in solution I is 1 mmol / L;

[0022] 1b. Add ammonia water to solution I, adjust the pH value to 9.5~11.0, and obtain solution II;

[0023] 1c. Transfer the solution II to a polytetrafluoroethylene reactor, react at 200°C for 72 hours, and naturally cool to room temperature to obtain a precipitate;

[0024] 1d. The precipitate is centrifuged and separated, and then washed with ethanol and acetone to obtain the product.

[0025] The phase of the product can be identified as pure UO2 by X-ray diffraction, and the crystallinity is >95%.

Embodiment 2

[0027] 2a. Under slow electromagnetic stirring, dissolve uranyl nitrate into a mixed solution of acetone and water, the volume percentage of acetone is 20%, to obtain solution I, and the concentration of uranyl ions in solution I is 10 mmol / L;

[0028] 2b. Adjust the pH value of solution I to 4.5 with ammonia water to obtain solution II;

[0029] 2c. Transfer the solution II to a polytetrafluoroethylene reactor, react at 160°C for 24 hours, and naturally cool to room temperature to obtain a yellow precipitate;

[0030] 2d. The precipitate is centrifuged and separated, and then washed with ethanol and acetone to obtain the product.

[0031] The phase of the product can be identified by X-ray diffraction as pure UO3·0.8H2O with a crystallinity of >95%. The shape of hexagonal microflakes was observed by scanning electron microscopy.

Embodiment 3

[0033] 3a. Under slow electromagnetic stirring, dissolve uranyl acetate into a mixed solution of acetone and water, the volume percentage of acetone is 50%, to obtain solution I, and the concentration of uranyl ion in solution I is 10mmol / L;

[0034] 3b. Add ammonia water to solution I, adjust the pH value to 7.5~8.5, and obtain solution II;

[0035] 3c. Transfer the solution II to a polytetrafluoroethylene reactor, react at 200°C for 20 hours, and naturally cool to room temperature to obtain a precipitate;

[0036] 3d. The precipitate is centrifuged and separated, and then washed with ethanol and acetone to obtain a product.

[0037] The phase of the product can be identified by X-ray diffraction as pure U3O8 with crystallinity>95%. Scanning electron microscope observed such as figure 1 The shape shown.

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Abstract

The invention discloses a controlled synthesis method of a uranium oxide microcrystal / nanocrystal. According to the controlled synthesis method, a hydrothermal synthesis method is utilized to preparea pure substance of the uranium oxide microcrystal / nanocrystal, and the components of the uranium oxide microcrystal / nanocrystal comprise but are not limited to UO3.xH2O, U3O8, U4O9, UO2, and UO2.34.The microcrystal / nanocrystal prepared by means of the controlled synthesis method is high in yield which is larger than 98%, good in crystallinity which is larger than 95%, and good in controllability. The controlled synthesis method is simple, efficient and capable of regulating and controlling the components, the shape and the size simultaneously, and has great significance. Uranium oxide has wide application value, and the uranium oxide microcrystal / nanocrystal can be applied to an advanced nuclear fuel system in the future. Meanwhile, U3O8, UO3.xH2O, U4O9, UO2, UO2.34 and the like can be expanded and applied to the field of catalysis and the field of semiconductor devices.

Description

technical field [0001] The invention belongs to the field of nanometer material preparation, and in particular relates to a controlled synthesis method of uranium oxide micro / nano crystals. Background technique [0002] Uranium oxide is widely used in the field of nuclear science, and it is also an excellent catalyst and semiconductor material. The morphology, size composition and performance of uranium oxide materials are closely related. [0003] Inside the nuclear reactor, the environment is very harsh, high temperature and high pressure, corrosion, strong radiation, etc. After the uranium oxide nuclear fuel is burned, the pellets will swell and rupture, the fission gas will be released, and the cladding will be deformed and damaged, which will affect the safety and economy of the nuclear reactor. In order to improve the performance of nuclear fuel, improve safety and economy, it is necessary to increase the thermal conductivity of the pellet, the ability to resist radi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G43/025C01G43/01B82Y40/00
CPCB82Y40/00C01G43/01C01G43/025C01P2004/01C01P2004/62C01P2004/64C01P2006/80
Inventor 严强毛义武彭述明梁建华周晓松叶民友
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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