Preparation method of cesium tungsten oxide ultrafine powder

A technology of cesium tungsten oxide and ultrafine powder, which is applied in the nano field, can solve problems such as being unfavorable to industrialized production, low efficiency, long reaction period, etc., and achieve the effects of short reaction preparation period, saving reaction raw materials, and saving preparation cost.

Active Publication Date: 2014-05-28
烟台佳隆纳米产业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method has a long reaction cycle and low efficiency, which is unfavorable for industrialized production

Method used

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  • Preparation method of cesium tungsten oxide ultrafine powder
  • Preparation method of cesium tungsten oxide ultrafine powder
  • Preparation method of cesium tungsten oxide ultrafine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of cesium tungsten oxide ultrafine powder, comprising the following steps:

[0028] (1) Take 5.07g of ammonium tungstate, 1.95g of cesium nitrate and 14.6g of EDTA, add 50ml of ethylene glycol, and react at 170°C for 3h;

[0029] (2) Put the mixed solution obtained in step (1) into a p-polystyrene pressure vessel for reaction, and react at 270°C for 5 hours;

[0030] (3) The reactant obtained in step (2) is washed with alcohol, centrifuged, and vacuum-dried at 80°C to obtain cesium tungsten powder with complete crystallinity.

[0031] The cesium tungsten powder prepared in this embodiment is dark blue. from figure 1 , figure 2 It can be seen that the cesium tungsten powder prepared in this example has high crystallinity, and the crystal phase composition is Cs 0.3 WO 3 or Cs 0.32 WO 3 , the particle size is 119nm, the powder resistance is 1.2×10 4 Ω.

Embodiment 2

[0033] A preparation method of cesium tungsten oxide ultrafine powder, comprising the following steps:

[0034] (1) Take 7.6g of ammonium paratungstate, 3.25g of cesium hydroxide and 17.5g of EDTA, add 50ml of ethylene glycol, and react at 170°C for 3h;

[0035] (2) Put the mixed solution obtained in step (1) into a p-polystyrene pressure vessel for reaction, and react at 270°C for 5 hours;

[0036] (3) The reactant obtained in step (2) is washed with alcohol, centrifuged, and vacuum-dried at 80°C to obtain cesium tungsten powder with complete crystallinity.

[0037] The cesium tungsten powder prepared in this embodiment is dark blue. from image 3 , Figure 4 It can be seen that the cesium tungsten powder prepared in this example has high crystallinity, and the crystal phase composition is Cs 0.3 WO 3 or Cs 0.32 WO 3 , the medium particle size is 119nm, and the powder resistance is 5.2×10 4 Ω.

Embodiment 3

[0039] A preparation method of cesium tungsten oxide ultrafine powder, comprising the following steps:

[0040] (1) Take 3.1g of ammonium metatungstate, 0.83g of cesium hydroxide and 5.1g of tartaric acid, add 50ml of propylene glycol, and react at 170°C for 3h;

[0041] (2) Put the mixed solution obtained in step (1) into a p-polystyrene pressure vessel for reaction, and react at 260°C for 8 hours;

[0042] (3) The reactant obtained in step (2) is washed with alcohol, centrifuged, and vacuum-dried at 80°C to obtain cesium tungsten powder with complete crystallinity.

[0043] The cesium tungsten powder prepared in this embodiment is dark blue. from Figure 5 , Image 6 It can be seen that the cesium tungsten powder prepared in this example has high crystallinity, and the crystal phase composition is Cs 0.3 WO 3 or Cs 0.32 WO 3 , the medium particle size is 119nm, and the powder resistance is 6.4×10 4 Ω.

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Abstract

The invention belongs to the field of nanotechnology, and particularly relates to a preparation method of cesium tungsten oxide ultrafine powder. The preparation method of the cesium tungsten oxide ultrafine powder comprises the following steps: weighing cesium salt and tungsten salt according to Cs/ W molar ratio of 1: (1.5-2.8), adding a chelating agent and an alcohol reagent, and reacting for 3 h at 170 DEG C; filling obtained mixed liquid into a pressure vessel, and reacting for 5-8 h at 260-270 DEG C; washing a reaction product with alcohol, centrifugating the reaction product, and performing vacuum drying at a temperature of 80 DEG C to obtain the cesium tungsten powder with complete crystallinity. Through the preparation method, reaction raw materials can be saved, so that the preparation cost; the preparation reaction period is short, so that industrial production is facilitated; the cesium tungsten oxide powder prepared through the preparation method is dark blue ultrafine powder with the particle size of 119 nm and the resistance of (1.2-6.4)*104 omega.

Description

technical field [0001] The invention belongs to the field of nanotechnology, in particular to a preparation method of cesium tungsten oxide ultrafine powder. Background technique [0002] WO 3 It has excellent performance in electrochromism, catalysis, gas sensitivity, etc. Its composite oxide - tungsten bronze generally refers to a metal oxide with a darker metallic luster, and is usually a metal conductor or metal semiconductor, tungsten bronze The general formula is AxWO 3 , However, with the different types and moles of cations—the values ​​of A and x, the structure and color of the compound will be different (J Analytical and Pyrolysis, 2000, 56:23-31). At present, there are more potassium cesium tungsten bronze and cesium tungsten bronze. Because of its low resistance, excellent visible light transmittance and near-infrared shielding performance, cesium tungsten bronze is widely used to prepare conductive films, and is used in glass transparent insulation. Used as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00
Inventor 盛振宏李宁施建军刘力娜冯志强王晓梅刘静徐斌王晓华王茂智陈鑫
Owner 烟台佳隆纳米产业有限公司
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