Method for producing nano-scale aluminum oxide particle with porous alumina film

A technology of porous alumina and alumina particles, applied in alumina/aluminum hydroxide, chemical instruments and methods, luminescent materials, etc., can solve the problems of complex preparation process of alumina particles, unsatisfactory products, high cost, and achieve blue light The effect of emission, small size and simple preparation method

Inactive Publication Date: 2011-01-19
NANJING UNIV
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Problems solved by technology

[0005] The problem to be solved by the present invention is: the preparation process of the existing alumina particles is complicated, the product is not ideal, and the cost is high, so a simple, cheap method for preparing alumina nanoparticles that can emit strong blue light is needed

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  • Method for producing nano-scale aluminum oxide particle with porous alumina film
  • Method for producing nano-scale aluminum oxide particle with porous alumina film
  • Method for producing nano-scale aluminum oxide particle with porous alumina film

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Embodiment Construction

[0011] The present invention is illustrated below with specific examples.

[0012] Use a 99.99% high-purity aluminum sheet with a thickness of 0.1mm, and electrochemically corrode it in an oxalic acid solution for 12 to 14 hours at a voltage of 40V to prepare a porous alumina film; place the porous alumina film in CuCl 2 In the saturated solution of porous anodized aluminum film, remove the remaining metal aluminum on the back of the porous anodized aluminum film, and then wash it repeatedly with deionized water, and after ultrasonic vibration treatment in a deionized water bath, remove the impurities on the surface of the film and in the pores, and dry it in the air , put the dried alumina film into a mortar and grind it into alumina powder; finally, place the collected alumina powder in deionized water and undergo ultrasonic vibration treatment for 1-2 hours to further crush the alumina powder , after standing and stratifying, the supernatant was taken to obtain a colloidal ...

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Abstract

The invention relates to a method for preparing alumina nanoparticles from a porous alumina film. The method comprises the following steps: grinding the porous alumina film into alumina powder, placing the alumina powder into deionized water, performing ultrasonic oscillation, performing delamination after keeping the solution stand, taking supernatant, and obtaining a colloidal solution in whichthe alumina nanoparticles are suspended, wherein the dimension of the alumina nanoparticles is less than 5 nanometers. The preparation method is simple and does not need complex experimental facilities; experimental materials are cheap and easily obtained; the dimension of the alumina nanoparticles is small; the blue-light emission of the alumina nanoparticles is strong and stable; and the optical properties of nano alumina are better known on the basis. A high-resolution electron micrograph indicates that the dimension of the alumina nanoparticles prepared by the method is less than 5.0 nanometers, and the average dimension of the alumina nanoparticles is 2.5 nanometers; and the measurement of a photoluminescent spectrum indicates that the peak position of emitted light moves from 380 nanometers to 480 nanometers when the wavelength of exciting light is increased from 280 nanometers to 400 nanometers.

Description

technical field [0001] The invention relates to a simple and cheap method for preparing aluminum oxide nanoparticles capable of emitting strong blue light, which is a method for preparing nano-scale aluminum oxide particles with a porous aluminum oxide film. Background technique [0002] Nano-alumina particles show strong volume effect / small size effect, quantum size effect, surface effect and macroscopic quantum tunneling effect because the ratio of surface atoms to bulk atoms increases sharply with the decrease of particle size. , thus exhibiting excellent performance in many aspects such as light, electricity, thermodynamics, and chemistry, and can be widely used in various important fields. For example, due to the characteristics of ultrafine, uniform composition and single dispersion of nano-alumina powder, it can be used in the electronics industry to improve the electrochemical properties of materials; nano-alumina powder has a large specific surface area, which can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C09K11/64
Inventor 王玲丽励星星吴兴龙沈剑沧
Owner NANJING UNIV
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