Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing m-phase vanadium dioxide nano-powder by salt-assisted ultrasonic pyrolysis

A technology of vanadium dioxide nanometer and pyrolysis method, which is applied in the field of preparation of inorganic functional materials, can solve the problems of unfavorable large-scale production and high cost, and achieve the effect of low cost, easy operation, continuous and rapid production

Active Publication Date: 2022-07-29
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
View PDF18 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has strict requirements on the experimental atmosphere and high cost, which is not conducive to 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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] In order to obtain a better preparation effect, the following scheme is preferred in step a: 1. In step a, the purity of the tetravalent vanadium salt is greater than or equal to 99.0%; 2. In step a, the molar concentration of the precursor solution is 0.01-1 mol 3. In step a, ultrasonic dispersion is performed for 15-30 min; 4. In step a, the auxiliary salt is: sodium nitrate, potassium nitrate, sodium acetate, potassium chloride, lithium chloride, potassium chloride or a combination thereof molten mixture; 5. In step a, the vanadium salt is: vanadyl sulfate, vanadyl oxalate or vanadyl dichloride; 6. In step a, the molar ratio of auxiliary salt to vanadium salt: 2:1~10:1 . Through the above-mentioned more precise control, the quality of preparation can be effectively improved, thereby obtaining better products.

[0019] Similarly, in order to obtain a better preparation effect, the following scheme is preferred in step b: 1. In step b, the ultrasonic frequency of the ...

Embodiment 1

[0022] a. Prepare 1000ml of 0.2mol / L vanadium oxychloride solution, add 1mol of sodium acetate at the same time, and ultrasonicate for 1h to obtain a blue and transparent precursor solution;

[0023] b. The precursor solution prepared in step a is placed in an ultrasonic atomizer with an ultrasonic frequency of 3MHz to be atomized to generate droplets, and the droplets are passed through a vertical tube furnace with a heating temperature of 550°C by 5L / min nitrogen gas, Collected through a high-voltage electrostatic collector, reacted for 1 hour, placed the collected powder in deionized water, ultrasonicated for 1 hour, filtered, and vacuum-dried at 80 °C to obtain blue-black M-phase vanadium dioxide nano-powder with a particle size of 40-50 nm. .

Embodiment 2

[0025] a. Configure 1000ml of 0.2mol / L vanadium oxychloride solution, add 1mol potassium chloride / lithium chloride (molar ratio 0.59 / 0.41) at the same time, and ultrasonicate for 1h to obtain a blue and transparent precursor solution;

[0026] b. The precursor solution prepared in step a is placed in an ultrasonic atomizer with an ultrasonic frequency of 3MHz for atomization to generate droplets, and the droplets are passed through a vertical tube furnace with a heating temperature of 600°C by 5L / min nitrogen gas, Collected with a high-voltage electrostatic collector, reacted for 1 hour, placed the collected powder in deionized water, ultrasonicated for 1 hour, filtered, and vacuum-dried at 80°C to obtain blue-black M-phase vanadium dioxide nanopowder with a particle size of 50-70 nm.

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to the field of preparation methods for inorganic functional materials, in particular to a salt-assisted ultrasonic pyrolysis method for preparing M-phase dioxide with a simple synthesis process and a short process, which can efficiently prepare monodisperse, high-purity nanometer vanadium dioxide powders The method for vanadium nano-powder includes the following steps: a. Preparing a precursor solution: dissolving auxiliary salt and tetravalent vanadium salt in deionized water, configuring into a precursor solution of vanadium source, and ultrasonically dispersing; b. preparing M Phase vanadium dioxide nano-powder: put the precursor solution prepared in step a in an ultrasonic atomizer and atomize to generate droplets, which are carried by the carrier gas through a vertical tube furnace and through a high-voltage electrostatic collector Collect, then put the collected powder in deionized water, carry out ultrasonic treatment and filtration, and obtain M-phase vanadium dioxide nano-powder after vacuum drying. The invention is especially suitable for the preparation process for preparing M-phase vanadium dioxide nano-powder.

Description

technical field [0001] The invention relates to the field of preparation methods for inorganic functional materials, in particular to a method for preparing M-phase vanadium dioxide nano-powder by a salt-assisted ultrasonic pyrolysis method. Background technique [0002] Vanadium dioxide (VO 2 ) is currently the most reported and widely used vanadium oxide, with VO 2 (A), VO 2 (B), VO 2 (C), VO 2 (D), VO 2 (M), VO 2 (R), VO 2 (T) and VO 2 (P) and other allotropes. where VO 2 (M) is the M-phase vanadium dioxide is the most studied phase. Since Morin F.J. first discovered that it has a semiconductor-metal phase transition in 1959, it has been confirmed that light, heat, electricity, stress, etc. can induce VO 2 (M) A phase transition occurs, accompanied by dramatic changes in properties such as crystal structure, resistivity, and optics. Due to VO 2 The unique phase change properties and excellent performance have been used in smart glass, optical storage, laser ra...

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): C01G31/02B82Y40/00B01J19/10
CPCC01G31/02B82Y40/00B01J19/10C01P2004/64C01P2004/62
Inventor 辛亚男彭穗刘波李道玉
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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