Method for preventing nano-grain from agglomeration and growth under high-temperature environment

A technology of nano-materials and high-temperature environment, which is applied in the direction of surface coating liquid devices, coatings, special surfaces, etc., can solve the problem that the aggregation and growth of nano-powders cannot be completely inhibited, the process is complex, and nano-powders have no universal significance and other problems, to achieve the effects of easy industrial implementation, simple process, and improved dispersion and thermal stability

Inactive Publication Date: 2007-09-05
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the above methods are complex in process, but only improve the dispersibility of the powder, and cannot completely inhibit the agglomeration and growth of nano-powders in high-temperature environments, and have no universal significance for nano-powders

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Anatase TiO with a particle size of 20nm is added to the container 2 Powder 2g, 2.40g NaH 2 PO 4 , 100mL of distilled water, stir well, soak for 24h, filter, wash with distilled water several times, and dry at 40°C for 24h. After the obtained powder is calcined at a high temperature of 800° C. for 6 hours, the particles still maintain a particle size of 20 nm, without sintering, agglomeration and growth.

Embodiment 2

[0017] Add 3g of ZnO powder with a particle size of 8nm, 2.94g of H 3 PO 4 , distilled water 100mL, ultrasonically dispersed for 20min, then soaked for 12h, filtered, washed several times with distilled water, and dried at 60°C for 18h. After the obtained powder is calcined at a high temperature of 600° C. for 2 hours, the particles still maintain the original particle size of 8 nm, without sintering, agglomeration and growth.

Embodiment 3

[0019] Add Fe with a particle size of 40nm to the container 2 o 3 Powder 3g, 5.44g KH 2 PO 4 , distilled water 100mL, ultrasonically dispersed for 20min, then soaked for 24h, filtered, washed several times with distilled water, and dried at 80°C for 12h. After the obtained powder is calcined at a high temperature of 400° C. for 2 hours, the particles still maintain the original particle size of 40 nm, without agglomeration and growth.

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PUM

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Abstract

A method for preventing the nanoparticles from growing and coagulating in high temp environment includes such steps as immersing the nanoparticles in the solution of phosphoric acid or phosphate for a certain time, filtering, washing, baking and calcining at 200-800 deg.C.

Description

technical field [0001] The invention relates to a method for preventing nanomaterial particles from agglomerating and growing up in a high-temperature environment, and belongs to the technical field of nanomaterial preparation. Background technique [0002] Nanomaterials refer to ultrafine materials with particle sizes ranging from 1 to 100 nm. When the particle size enters the nanometer level, it has quantum size effect, small size effect, surface effect and macroscopic quantum tunneling effect, showing many unique properties, and has great advantages in catalysis, light filtering, light absorption, medicine, magnetic media, etc. Broad application prospects. However, nanoparticles have a small particle size, high surface energy, and a tendency to spontaneously agglomerate, especially in the environment of high temperature use, where nanoparticles will have serious agglomeration and growth, and the agglomeration and growth of particles will greatly affect the advantages of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J2/30
Inventor 张艳峰魏雨李平刘敬泽
Owner HEBEI NORMAL UNIV
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