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A kind of amine-directed method for synthesizing thermally stable layered nanocrystalline zirconia

A layered nanotechnology and thermal stability technology, applied in zirconia, nanotechnology and other directions, can solve the problems of disordered arrangement of zirconia nanocrystals, high cost, low thermal stability, etc. The effect of environmental protection and good thermal stability

Inactive Publication Date: 2017-11-17
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention is simple in process, environment-friendly, high in efficiency and low in cost, so as to overcome the shortcomings of existing nano-zirconia powder preparation methods such as complex process, harsh conditions, high cost, low thermal stability, and disordered arrangement of zirconia nanocrystals.

Method used

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  • A kind of amine-directed method for synthesizing thermally stable layered nanocrystalline zirconia
  • A kind of amine-directed method for synthesizing thermally stable layered nanocrystalline zirconia

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] (1) Take 0.0021mol of ZrOCl 2 ·8H 2 O is poured into the flask with a reflux device, then add 35mL of deionized water, stir it with a glass rod to dissolve it, then add 0.126g of octadecylamine to the flask; under stirring, heat up to reflux temperature and maintain reflux for 0.5 hours, Obtain mixed solution A;

[0024] (2) Dissolve 0.0126mol of NaOH in a beaker filled with 35mL of water to prepare a sodium hydroxide solution, then add it to the flask in step (1), and continue to reflux for 2 hours to obtain a solid-liquid mixture B;

[0025] (3) Move the mixture B obtained in step (2) into a high-pressure reactor, seal it, put the reactor into an oven that has been heated to 150°C in advance, and perform a hydrothermal reaction under autogenous pressure for 13 hours to obtain a solid-liquid mixture C;

[0026] (4) The mixture C was washed 5 times with water, and then centrifuged, and the resulting precipitate was dried at 70°C to obtain a white powder; the powder wa...

Embodiment 2

[0030] The reflux time in the step (1) in the embodiment 1 is set as 1 hour, and other steps are with embodiment 1. Obtain product with embodiment 1.

Embodiment 3

[0032] The reflux reaction time in the step (2) in the embodiment 1 is set as 5 hours, and other steps are with embodiment 1. Obtain product with embodiment 1.

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Abstract

The invention discloses a method for amine-oriented synthesis of thermal-stability layered nanocrystalline zirconium oxide. The method comprises the steps of (1) adding amine to a zirconium oxychloride solution and refluxing to obtain mixed liquid A; (2) adding the sodium hydroxide solution into the mixed liquid A and further keeping reflux reaction for 2-5 hours; (3) heating the mixed liquid A to 120-150 DEG C and carrying out hydrothermal reaction for 13-15 hours; and (4) washing, carrying out centrifugal separation and drying to obtain white powder, burning the powder in an air atmosphere at 550 DEG C for 2 hours to obtain the product which is thermal-stability layered nanocrystalline zirconium oxide. By adopting the method of combining 'refluxing, precipitation and hydrothermal treating', the order degree of the product is improved and the good thermal stability of the product is also ensured.

Description

technical field [0001] The invention relates to the technical synthesis field of thermally stable and ordered layered nanostructure materials, in particular to an amine-directed method for synthesizing thermally stable layered nanocrystalline zirconia. Background technique [0002] High-purity zirconia (ZrO 2 ) is a white powder with a density of 5.68g / cm 3 , with a melting point of about 2700°C, relatively pure ZrO 2 It is yellow or gray. Zirconia has high hardness, Mohs hardness exceeds 7, has both oxidizing and reducing properties, is easy to generate oxygen vacancies (and is classified as a P-type semiconductor), and can uniquely interact with the active phase. Zirconia has attracted much attention due to its superior mechanical, dielectric and catalytic properties, and is often used in sensors, solid oxide fuel cells (SOFC), ceramics, piezoelectric materials, catalysts, and catalyst supports. [0003] In recent years, superstructured zirconia has attracted much atte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02B82Y40/00
CPCB82Y40/00C01G25/02C01P2002/72C01P2004/04C01P2006/32C01P2006/80
Inventor 刘超吴芳芳纪秀杰李颖谭宏亮赵阳阳
Owner HEBEI UNIV OF TECH