Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for preparing vanadium dioxide and doping powder thereof by combustion method

A technology of vanadium dioxide and combustion method, which is applied in the direction of vanadium oxide, etc., can solve the problems that it is difficult to obtain VO2 pure phase, difficult to control the valence state of vanadium, difficult to scale production, etc., to achieve superior intelligent energy-saving cycle performance, easy to The effect of enlarging mass production and low cost

Inactive Publication Date: 2010-12-08
UNIV OF SCI & TECH OF CHINA
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires expensive cost and it is difficult to control the valence state of vanadium in it, and it is difficult to obtain VO 2 pure phase
This makes the monoclinic and tetragonal rutile vanadium dioxide (VO2(M) and VO 2 (R)) The preparation cost of the powder is greatly increased, and it is difficult to achieve large-scale production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing vanadium dioxide and doping powder thereof by combustion method
  • Method for preparing vanadium dioxide and doping powder thereof by combustion method
  • Method for preparing vanadium dioxide and doping powder thereof by combustion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Monoclinic VO 2 (VO 2 (M)) Realization of powder material: add 1mmol ammonium metavanadate (NH 4 VO 3 ) into 100 mL of organic solvent cyclohexane, and ultrasonically disperse. The combustion ambient temperature is around 25°C. Then directly ignite it with an open flame for about half an hour and the reaction is complete. The resulting sample was washed with pure water. The remaining inorganic ions in the filtrate washed with pure water are obtained by evaporation, and these ions can be reacted in the next step, so that the utilization rate of raw materials reaches 100%. This is convenient to get VO 2 (M) Powder material. Such as figure 1 As shown, all X-ray powder diffraction peaks can be indexed as VO 2 (M) powder and no other impurity peaks appear, so the powder material synthesized by this method is high-purity VO 2 (M) Powder material. figure 2 According to the ordinary FE-SEM photos of the obtained products, it can be seen from the photos that the prod...

Embodiment 2

[0035] Nano-sized monoclinic VO 2 (VO 2 (M)) Realization of solid spheres of powder materials: Add 1mmol sodium orthovanadate powder into 100mL organic solvent methanol in a 250mL glass jar, and the combustion environment temperature is around 25°C. Then directly ignite it with an open flame for about half an hour and the reaction is complete. The obtained sample can be washed with pure water. The remaining inorganic ions in the filtrate washed with pure water are obtained by evaporation, and these ions can be reacted in the next step, so that the utilization rate of raw materials reaches 100%. Figure 4 It is the FE-SEM photo of the nano-solid spheres of the product obtained according to this embodiment.

Embodiment 3

[0037] Nano-sized monoclinic VO 2 (VO 2 (M)) Realization of powder material nanoribbons: add 1mmol VOSO to a 250mL glass jar 4 The powder is added to 100mL organic solvent toluene, and the combustion environment temperature is around 25°C. Then directly ignite it with an open flame for about half an hour and the reaction is complete. The obtained sample can be washed with pure water. Figure 5 It is a nanobelt FE-SEM photo of the product obtained according to this embodiment.

[0038] From the photographs of the nanonized products obtained in Examples 2 and 3, the particle shape of the obtained products is regular, the size range is small, and it can have better industrial applications.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
phase transition temperatureaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for preparing vanadium dioxide and doping powder thereof by a combustion method. The method comprises the following steps: vanadium source is added into a combustion device filled with proper quantity of flammable organic solvent, reaction is conducted in the combustion device at the temperature of -5-40 DEG C to ensure the complete combustion of reactant, and vanadium dioxide is collected. The preparation method has simple technique, low cost and high yield and is applicable to large-batch production and the purity of obtained vanadium dioxide powder with intelligent energy-saving property is good. Furthermore, in the invention, the vanadium dioxide doping powder is obtained by adding compound containing wolfram, molybdenum or titanium into organic solvent,thus being suitable for wider industrial purpose. The nano-products of the vanadium dioxide powder can be obtained by controlling the vanadium source and the category of the organic solvent.

Description

technical field [0001] The invention relates to the preparation of monoclinic phase and tetragonal rutile phase vanadium dioxide powder, in particular to a method for preparing the powder, nanometer powder and doped powder based on a combustion method. Background technique [0002] Vanadyl oxide is a very important class of materials with intelligent properties. Changes in ambient temperature will cause changes in the crystal structure, electric domain structure, and magnetic structure of the material, resulting in large changes in optical properties. Especially vanadium dioxide (VO 2 ) has received special attention. [0003] Monoclinic VO 2 (VO 2 (M)) and tetragonal rutile phase VO 2 (VO 2 (R)) powder can be intelligently regulated to the outside world, such as the infrared part of sunlight, through phase change to achieve intelligent energy saving. Single crystal VO 2 The metal-insulator phase transition temperature is about 68 °C. At this temperature, VO 2 The c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
Inventor 谢毅吴长征
Owner UNIV OF SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com