Method for separating different sizes of alpha aluminum oxide nano-particles

A technology of α-alumina and nano-particles, applied in chemical instruments and methods, solid separation, wet separation, etc., can solve the problems of difficult particle separation, easy introduction of impurities, complicated operation, etc., and achieve easy recycling and simple methods , the effect of high repetition rate

Active Publication Date: 2014-11-12
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the operation of these two separation technologies is quite complicated, it is easy to introduce impurities, and it is difficult to achieve large-scale particle separation

Method used

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  • Method for separating different sizes of alpha aluminum oxide nano-particles
  • Method for separating different sizes of alpha aluminum oxide nano-particles
  • Method for separating different sizes of alpha aluminum oxide nano-particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weighing α-Al obtained by high energy ball milling method with electronic balance 2 o 3 For 0.4 g of nanoparticle powder, use a 10 mL graduated cylinder to take 4 mL of 1.25 M hydrochloric acid solution, put it into a centrifuge tube, and disperse the weighed alumina powder into it, and sonicate for 0.5 h. After sonication, centrifuge at 10,000 rpm for 5 min. Use a straw to draw the supernatant into another centrifuge tube, and adjust its concentration to 4.0 M with concentrated hydrochloric acid. It can be found that the originally clear solution has turned into a white emulsion, and then continue to centrifuge the white emulsion at 15,000 rpm for 5 min After centrifugation, suck out the supernatant with a pipette, and the precipitate in the centrifuge tube is the first step of separating the product.

[0028] pass image 3 It can be seen from the TEM photos that the size distribution of the α-alumina nanoparticles separated in the first step is very uniform, the s...

Embodiment 2

[0030] Take 4 mL of 0.75 M hydrochloric acid solution in a 10 mL graduated cylinder, and disperse the precipitate obtained by centrifuging at 10,000 rpm for 5 min in Example 1 into it, and ultrasonicate for half an hour. The centrifuge tubes were then placed in a centrifuge and centrifuged at 10,000 rpm for 5 min. Use a straw to draw the supernatant into another centrifuge tube, and adjust its concentration to 4.0 M with concentrated hydrochloric acid. It can be found that the originally clear solution has turned into a white emulsion, and then continue to centrifuge the white emulsion at 15,000 rpm for 5 min After centrifugation, suck out the supernatant with a straw, and the precipitate in the centrifuge tube is the product of the second step of separation.

[0031] pass Figure 4 It can be seen from the TEM photos that the size distribution of α-alumina nanoparticles separated in the second step is mainly concentrated between 6.1-17.2 nm, and the average particle size is ...

Embodiment 3

[0033] Take 4 mL of 0.1 M hydrochloric acid solution in a 10 mL graduated cylinder, and disperse the precipitate obtained by centrifuging at 10,000 rpm for 5 min in Example 3 into it, and ultrasonicate for half an hour. The centrifuge tubes were then placed in a centrifuge and centrifuged at 10,000 rpm for 5 min. Use a straw to draw the supernatant into another centrifuge tube, and adjust its concentration to 4.0 M with concentrated hydrochloric acid. It can be found that the originally clear solution has turned into a white emulsion, and then continue to centrifuge the white emulsion at 15,000 rpm for 5 min After centrifugation, suck out the supernatant with a straw, and the precipitate in the centrifuge tube is the product of the third step separation.

[0034] pass Figure 5 It can be seen from the TEM photos that the size distribution of α-alumina nanoparticles separated in the third step is mainly concentrated between 8.8-30.7 nm, and the average particle size is 17.7 nm...

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Abstract

The invention discloses a technology for separating different sizes of alpha aluminum oxide nano-particles. The separation method adopts mineral acid solutions, most preferably hydrochloric acid, with different concentrations to separate different sizes of alpha aluminum oxide nano-particles. The method comprises the steps as follows: the alpha aluminum oxide nano-particles are dispersed in hydrochloric acid with different concentrations to obtain different sizes of alpha aluminum oxide nano-particles through separation, wherein during separation processing, the concentration of the used diluted hydrochloric acid is 0-1.25 M; the ratio of the amount of the diluted hydrochloric acid to the to-be-processed alpha aluminum oxide nano-particles is 0.5-4.0 ml / g; and during separation of the particles in supernatant, the concentration of the hydrochloric acid in the supernatant is required to be adjusted to 2.0-10.0 M by concentrated hydrochloric acid. The method is quite simple, can separate alpha aluminum oxide nano-particle powder according to different sizes very conveniently, cannot introduce impurities in a separation process, cannot produce pollution, and can be applied widely in the industry.

Description

technical field [0001] The present invention relates to separation technology of alpha alumina nanoparticles of different sizes. Background technique [0002] Alpha alumina is the stable phase of alumina. Alpha alumina nanoparticles have a wide range of applications. Adding 5% alumina nanoparticles to conventional alumina ceramics can improve the toughness of the ceramics and reduce the sintering temperature. For alumina structural materials, if the particle diameter is reduced from 10 μm to 10 nm, the diffusion rate will increase to 10 9 ~10 12 times, the sintering temperature can be reduced by hundreds of degrees. Alpha alumina nanoparticles have good electrical insulation, chemical durability, heat resistance, strong radiation resistance, high dielectric constant, flat and uniform surface, and low cost. They can be used as substrate materials for semiconductor devices and large-scale integrated circuits , which are widely used in microelectronics, electronics and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B5/32
Inventor 李建功蒲三旭李璐马骥沈利亚
Owner LANZHOU UNIVERSITY
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