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Method for preparing cubic crystal system cerium oxide nanocrystal

A technology of cubic crystal system and cerium oxide, which is applied in the direction of chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of uniform mixing, inferior raw materials, and long time required to achieve high sample purity, similar shape, even size effect

Active Publication Date: 2014-03-12
常熟紫金知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also some shortcomings in the preparation of cerium oxide nanoparticles by these methods, mainly in: (1) the solid-phase method is simple to operate, but the raw materials used are not as uniform as the liquid-phase method, and it is difficult to obtain nanoparticles at high temperatures
(2) The process of the liquid phase method is relatively complicated, the cost is high, and the time required is long, so it is difficult to meet the requirements of industrialization
(3) The liquid phase method is easy to introduce impurities, and the purity of the obtained product is relatively poor

Method used

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  • Method for preparing cubic crystal system cerium oxide nanocrystal
  • Method for preparing cubic crystal system cerium oxide nanocrystal
  • Method for preparing cubic crystal system cerium oxide nanocrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 0.5g of gelatin and dissolve it in 49.5g of hot water at 70°C to prepare an aqueous solution of gelatin with a mass fraction of 1%;

[0028] (2) Weigh 2.1711g Ce(NO 3 ) 3 ?6H 2 O is dissolved in the aqueous gelatin solution to prepare a 0.1mol / L cerous nitrate solution;

[0029] (3) Weigh 1.6987g of hydrogen peroxide solution with a mass fraction of 30% (containing H 2 o 2 0.5096g, combined 0.015mol), add in the cerous nitrate solution, stir, until the flocculent insoluble matter is formed in the liquid, obtain the solution containing the flocculent insoluble matter; The ratio of the amount of the cerous nitrate to the hydrogen peroxide substance is 1:3.

[0030] (4) dripping ammonia water with a mass concentration of 28% into the solution containing flocculent insolubles described in step (3), until the pH of the solution is 10, forming a large amount of insolubles;

[0031] (5) Collecting a large amount of insoluble matter described in step (4) by fil...

Embodiment 2

[0036] (1) Weigh 1.0g of gelatin and dissolve it in 49.0g of hot water at 70°C to prepare an aqueous gelatin solution with a mass fraction of 2%;

[0037] (2) Weigh 2.1711g Ce(NO 3 ) 3 ?6H 2 O is dissolved in the aqueous gelatin solution to prepare a 0.1mol / L cerous nitrate solution;

[0038] (3) Weigh 1.6987g of hydrogen peroxide solution with a mass fraction of 30% (containing H 2 o 2 0.5096g, combined 0.015mol), add in the cerous nitrate solution, stir, until the flocculent insoluble matter is formed in the liquid, obtain the solution containing the flocculent insoluble matter; The ratio of the amount of the cerous nitrate to the hydrogen peroxide substance is 1:3.

[0039] (4) dripping ammonia water with a mass concentration of 28% into the solution containing flocculent insolubles described in step (3), until the pH of the solution is 10, forming a large amount of insolubles;

[0040] (5) Collecting a large amount of insoluble matter described in step (4) by filtra...

Embodiment 3

[0044] (1) Weigh 2.5g of gelatin and dissolve it in 47.5g of hot water at 70°C to prepare an aqueous gelatin solution with a mass fraction of 5%;

[0045] (2) Weigh 2.1711g Ce(NO 3 ) 3 ?6H 2 O is dissolved in the aqueous gelatin solution to prepare a 0.1mol / L cerous nitrate solution;

[0046] (3) Weigh 1.6987g of hydrogen peroxide solution with a mass fraction of 30% (containing H 2 o 2 0.5096g, combined 0.015mol), add in the cerous nitrate solution, stir, until the flocculent insoluble matter is formed in the liquid, obtain the solution containing the flocculent insoluble matter; The ratio of the amount of the cerous nitrate to the hydrogen peroxide substance is 1:3.

[0047] (4) dripping ammonia water with a mass concentration of 28% into the solution containing flocculent insolubles described in step (3), until the pH of the solution is 10, forming a large amount of insolubles;

[0048] (5) Collecting a large amount of insoluble matter described in step (4) by filtrati...

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Abstract

The invention provides a method for preparing cubic crystal system cerium oxide nanocrystal, belonging to the field of preparation technology of nanometer materials. The method comprises the steps of: dissolving gelatin in hot water to prepare 1-5% of gelatin water solution; dissolving Ce(NO3)3.6H2O into the gelatin water solution to prepare 0.01-0.2mol / L of cerous nitrate solution; adding hydrogen peroxide solution into the cerous nitrate solution according to the molar ratio of cerous nitrate to hydrogen peroxide being 1: 1-6, and stirring until flocculent insoluble substance is formed; dripping ammonia water into the mixed solution until the pH value of the solution is 9-12, and forming a great deal of insoluble substance; and filtering, collecting, drying and roasting to obtain the cubic crystal system cerium oxide nanocrystal. The method is simple in technology and low in cost; the size of the product cubic crystal system cerium oxide nanocrystal can be controlled by adjusting the preparation conditions; and the obtained cubic crystal system cerium oxide nanocrystal is high in purity, even in nano-particle size and similar in morphology.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing cubic cerium oxide nanocrystals. Background technique [0002] Due to their unique surface effects, quantum size effects, volume effects and macroscopic tunnel effects, nanomaterials exhibit special properties different from conventional materials, and thus are widely used in various fields. As a member of new materials—research on rare earth nanomaterials has also become one of the hotspots of scientists from all over the world. Nano ceria has the advantages of single crystal form, good electrical and optical properties, so it is widely used in solid oxide fuel cell electrodes, photocatalysts, anti-corrosion coatings, gas sensors, fuel cells, ion films, polishing materials, etc. . [0003] There are many methods for preparing cerium oxide, mainly including solid-phase method and liquid-phase method. The preparation of cerium oxide by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00B82Y30/00
Inventor 沈国柱程国生刘斌姚义俊
Owner 常熟紫金知识产权服务有限公司
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