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Method for preparing multibasic oxide nanometer particles based on core-shell structure three-dimensional micro-solid-phase reaction.

A nanoparticle, core-shell structure technology, applied in the field of material preparation, can solve the problems of many control factors in the preparation process, no preparation method of multi-component oxide nanoparticles, and different shapes of precursor precipitates, etc., to achieve controllable preparation , reduce the phase formation temperature, and avoid the effect of powder agglomeration

Active Publication Date: 2014-05-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many methods for preparing YAG powder, such as sol-gel method, homogeneous precipitation method, co-precipitation method, hydrothermal method, etc. Although these methods can realize the preparation of powder, due to the existence of aluminum ions, its easy hydrolysis The resulting precursor precipitates usually have different shapes, and it is difficult to control the shape; in addition, there are many control factors in the preparation process, such as the concentration of the ion solution, the pH value of the reaction system, the reaction temperature and time, etc. These factors need to be coordinated with each other , is not conducive to the maturity and transfer of process methods
[0004] In order to realize the controllable preparation of the morphology of multi-component oxides and reduce the control factors in the process of precursor precipitation formation, after searching, there is no information about the preparation of multi-component oxide nanoparticles based on the three-dimensional micro-solid phase reaction of the core-shell structure. method reporting

Method used

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  • Method for preparing multibasic oxide nanometer particles based on core-shell structure three-dimensional micro-solid-phase reaction.
  • Method for preparing multibasic oxide nanometer particles based on core-shell structure three-dimensional micro-solid-phase reaction.

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Effect test

Embodiment 1

[0026] Using urea as a precipitating agent to prepare multiple oxide YAG nanopowders

[0027] (1) For prefabricated YAG powder, select α-Al with spherical shape 2 o 3 As the core structure of the preparation process, the corresponding yttrium ions need to be precipitated and uniformly coated on α-Al 2 o 3 surface. The method is: take 10ml of yttrium nitrate solution with a concentration of 0.6mol / L, mix it well with 80ml of urea with a concentration of 0.5mol / L, raise the temperature to 95°C at 5°C / min, keep it warm for 3 hours, cool down naturally, and wash with water Obtain the precursor precipitation of yttrium element;

[0028] (2) Use the zeta potential meter to test the spherical nanoparticles α-Al respectively 2 o 3 The surface electrical properties of the precursor of yttrium and yttrium element precipitated in 0.05mol / L ammonium bicarbonate solution, it is determined that the surface electrical properties of the two are opposite;

[0029] (3) Weigh 1.28g of α-A...

Embodiment 2

[0033] Using ammonium bicarbonate as precipitant to prepare YAG nanopowder

[0034] (1) For prefabricated YAG powder, select α-Al with spherical shape 2 o 3 As the core structure of the preparation process, the corresponding yttrium ions need to be precipitated and uniformly coated on α-Al 2 o 3 surface. The method is: take 10ml of yttrium nitrate solution with a concentration of 0.6mol / L, add 0.5mol / L ammonium bicarbonate dropwise into the above solution at a rate of 2ml / min, and stir vigorously at the same time until the pH value of the mixed solution reaches 7.5, stop Ammonium bicarbonate was added dropwise, and the precursor precipitation of yttrium element was obtained after washing;

[0035] (2) Use the zeta potential meter to test the spherical nanoparticles α-Al respectively 2 o 3 The surface electrical properties of the precursor of yttrium and yttrium element precipitated in 0.05mol / L ammonium bicarbonate solution, it is determined that the surface electrical p...

Embodiment 3

[0040] Using ammonia as a precipitant to prepare YAG nanopowder

[0041] (1) For the preparation of YAG powder, select α-Al with spherical shape 2 o 3 As the core structure of the preparation process, the corresponding yttrium ions need to be precipitated and uniformly coated on α-Al 2 o 3 surface. The method is: take 10ml of yttrium nitrate solution with a concentration of 0.6mol / L, add 0.5mol / L ammonia water dropwise to the above solution at a rate of 2ml / min, and stir vigorously at the same time until the pH value of the mixed solution reaches 7.5, then stop dripping Add ammonia water, obtain the precursor precipitation of yttrium element after washing;

[0042] (2) Use the zeta potential meter to test the spherical nanoparticles α-Al respectively 2 o 3 The surface electrical properties of the precursors of yttrium and yttrium element precipitated in 0.05mol / L ammonia solution, confirm that the surface electrical properties of the two are opposite;

[0043] (3) Weigh...

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Abstract

The invention discloses a method for preparing multibasic oxide nanometer particles based on a core-shell structure three-dimensional micro-solid-phase reaction. The method comprises the following steps of: with an oxide particle, which is one of prepared multibasic oxides and has easily controlled morphology, as a core, carrying out appropriate surface charge modification so that other element ions evenly wrap the oxide particle so as to form an oxide particle core-shell structure precursor; and during calcination, implementing low-temperature phase transformation and particle morphology control through the three-dimensional micro-solid-phase reaction between the shell made of the nanometer oxide or an amorphous part generated by decomposition and the wrapped nucleus, thereby obtaining the multibasic oxide nanometer particle and providing a raw material base for the preparation of corresponding ceramic.

Description

technical field [0001] The invention relates to a method for preparing oxide nanoparticles, in particular to a method for preparing multi-component oxide nanoparticles based on a three-dimensional micro-solid phase reaction of a core-shell structure, and belongs to the technical field of material preparation. Background technique [0002] The application fields of multiple oxides are very wide, such as BaCe 0.8 Y 0.2 o 3-a Used as an electrolyte for solid oxide fuel cells; Y 3 Fe 5 o 12 It is an iron oxide synthetic crystal with multiple magnetic properties. It is often used to adjust lasers, and as a microwave ferrite device, it is an important basic material for circulators, isolators, phase shifters, modulators, filters, switches and other devices; CuMnCo composite oxide can be used for the treatment of organic pollution waste gas; MgAl 2 o 4 Transparent ceramics are optical materials with important applications from ultraviolet, visible light to mid-infrared bands...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/443C04B35/40C04B35/626
Inventor 桑元华刘宏赵莉莉王亚娜秦海明冷艳华王继扬
Owner SHANDONG UNIV
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