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Preparation method of open tin dioxide hollow spheres

A tin dioxide, open-type technology, applied in tin oxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of increased contact resistance, poor wettability, large contact angle, etc. Large contact area, low cost, uniform size effect

Inactive Publication Date: 2015-09-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also shortcomings and deficiencies: 1. Ag / SnO 2 SnO in composites 2 The density of SnO is small, and it is easy to enrich on the surface of the material under the action of the arc, which increases the contact resistance and thus the temperature rises; 2. SnO 2 The contact angle between particles and silver is large, the wettability is poor, and the combination between the two is not strong

Method used

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  • Preparation method of open tin dioxide hollow spheres
  • Preparation method of open tin dioxide hollow spheres
  • Preparation method of open tin dioxide hollow spheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Prepare mixed solvent (EtOH / H 2 O): the volume ratio of alcohol (EtOH) and deionized water is V EtOH / V H2O =37.5% proportioning preparation mixed solvent.

[0027] (2) Weigh 2.12g of sodium stannate and dissolve it in the above mixed solution, and form a tin salt solution with a concentration of 0.2mol / L after fully stirring; weigh according to the ratio of 1:0.33 in the molar ratio of sodium stannate to urea 0.2g of urea, placed in the prepared above-mentioned tin salt solution under the condition of sufficient stirring, stirred for 15 minutes at the same time, and then ultrasonicated for 15 minutes;

[0028] (3) Transfer the completely dissolved above-mentioned solution to a stainless steel reactor lined with polytetrafluoroethylene, react at a temperature of 180°C for 24h, and then naturally cool to room temperature;

[0029] (4) Centrifuge or filter the hydrothermal reaction product, then wash repeatedly with deionized water and absolute ethanol until there ...

Embodiment 2

[0031] (1) Prepare mixed solvent (EtOH / H 2 O): Alcohol (EtOH) and deionized water are prepared in a proportion of 50% by volume as a mixed solvent.

[0032] (2) Weigh 2.12g of sodium stannate and dissolve it in the above mixed solution, and form a tin salt solution with a concentration of 0.25mol / L after fully stirring; weigh according to the ratio of 1:0.66 in the molar ratio of sodium stannate to urea 0.4g urea, placed in the prepared above-mentioned tin salt solution under the condition of sufficient stirring, stirred for 20 minutes at the same time, and then ultrasonicated for 15 minutes;

[0033] (3) Transfer the completely dissolved above-mentioned solution to a stainless steel reactor lined with polytetrafluoroethylene, react at a temperature of 120°C for 12h, and then naturally cool to room temperature;

[0034] (4) Centrifuge or filter the hydrothermal reaction product, then wash repeatedly with deionized water and absolute ethanol until there are no soluble ions in ...

Embodiment 3

[0036] (1) Prepare mixed solvent (EtOH / H 2 O): Alcohol (EtOH) and deionized water are prepared in a proportion of 15% by volume as a mixed solvent.

[0037] (2) Weigh 2.12g of sodium stannate and dissolve it into the above mixed solution, and form a tin salt solution with a concentration of 1mol / L after fully stirring; weigh 0.2 g of sodium stannate according to the molar ratio of urea to 1:0.33. g urea, placed in the above-mentioned tin salt solution prepared under the condition of sufficient stirring, while stirring for 15 minutes, and then ultrasonically ultrasonicated for 15 minutes;

[0038] (3) Transfer the completely dissolved above-mentioned solution to a stainless steel reaction kettle lined with polytetrafluoroethylene, react at 200°C for 5 hours, and then cool naturally to room temperature;

[0039] (4) Centrifuge or filter the hydrothermal reaction product, then wash repeatedly with deionized water and absolute ethanol until there are no soluble ions in the soluti...

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Abstract

The invention relates to the field of nanomaterial preparation and aims at providing a preparation method of open tin dioxide hollow spheres. The preparation method of open tin dioxide hollow spheres comprises the following steps: mixing absolute ethyl alcohol with deionized water to obtain a solvent, next, dissolving sodium stannate in a solvent and thoroughly stirring to obtain a tin salt solution; next, weighing urea and adding the urea to the tin salt solution, stirring and performing ultrasonic treatment to obtain a mixed solution; next, transferring the mixed solution to a polytetrafluoroethylene lined stainless steel reaction kettle, performing a hydrothermal reaction, naturally cooling and then centrifugally separating or filtering the product of the hydrothermal reaction to obtain precipitate, and finally, washing and drying the precipitate to obtain the high-purity open hollow sphere tin dioxide powder. The tin dioxide powder prepared by use of the method is capable of avoiding floating and enrichment of SnO2 in use, improving the stability of an Ag / SnO2 and prolonging the service life of the material, and then suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of preparation of nanometer materials, in particular to a method for preparing open-shaped tin dioxide hollow spheres. Background technique [0002] Electrical contacts are the key components of electrical switches, instruments and meters, etc., and are widely used in relays, contactors and circuit breakers, and their performance directly affects the on-off capacity, service life and operational feasibility of the complete equipment. Since the 1950s, Ag / CdO electrical contact composites have been widely used due to their advantages of arc resistance, welding resistance, corrosion resistance, low contact resistance and good processing performance. [0003] With the requirements and development trend of the whole international society and the environment on the environmental protection, long life and high reliability of electrical contact materials. Especially after the promulgation of the RoHS Act of the European Unio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82Y30/00
Inventor 沈涛张玲洁杨辉樊先平陈乐生申乾宏
Owner ZHEJIANG UNIV
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