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Method for Direct Preparation of m-phase Vanadium Dioxide Nanopowder by Ultrasonic Spray Pyrolysis

A technology of vanadium dioxide nanometer and ultrasonic spray pyrolysis, which is applied in the direction of vanadium oxide and nanotechnology, can solve the problems of unfavorable large-scale production and high cost, and achieve the effect of low cost, short process and continuous rapid production

Active Publication Date: 2022-05-24
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
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  • 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

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]A. 1000ml of 0.2mol / L vanadium dichlorooxygen solution was prepared to obtain a blue transparent precursor solution;

[0022] b, the precursor solution prepared in step a is placed in an ultrasonic frequency of 3MHz ultrasonic nebulizer atomized to produce droplets, by 5 L / min nitrogen the small droplets through the heating temperature of 700 ° C vertical tube furnace, collected by a high-pressure electrostatic collector, reaction 1h, the collected powder is placed in deionized water, ultrasonic 1h, filtering, 80 °C vacuum drying will be given after the blue-black M phase vanadium dioxide nano powder, particle size 60 ~ 100nm.

Embodiment 2

[0024] A. Configure 0.5mol / L vanadium dichlorooxymetryl solution of 1000m to obtain a blue transparent precursor solution;

[0025] b, the precursor solution prepared in step a is placed in an ultrasonic frequency of 3MHz ultrasonic nebulizer atomized to produce droplets, by 5 L / min nitrogen the small droplets through the heating temperature of 600 °C vertical tubular furnace, collected by high-pressure electrostatic collector, reaction 1h, the collected powder is placed in deionized water, ultrasonic 1h, filtering, 80 °C vacuum drying after the blue-black M phase vanadium dioxide nano powder, particle size 80 ~ 110nm.

Embodiment 3

[0027] A. Configure 0.5mol / L vanadium dichlorooxymetry solution of 1000ml to obtain a blue transparent precursor solution;

[0028] b, the precursor solution prepared in step a is placed in an ultrasonic frequency of 3MHz ultrasonic nebulizer atomized to produce droplets, by 2L / min nitrogen the small droplets through the heating temperature of 700 ° C vertical tube furnace, collected by high-pressure electrostatic collector, reaction 1h, the collected powder is placed in deionized water, ultrasonic 1h, filtering, 80 °C vacuum drying will be given after the blue-black M phase vanadium dioxide nano powder, particle size 30-150nm, median particle size 70nm.

[0029] The present invention is based on ultrasonic spray pyrolysis to directly prepare M phase vanadium dioxide nano powder, can be prepared uniform morphology, narrow distribution, good dispersibility of nano powder. Compared with the existing technology, it has advantages and competitiveness in the manufacture of high-quali...

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Abstract

The invention relates to the field of vanadium dioxide powder preparation, in particular to an ultrasonic spray pyrolysis method for directly preparing monodisperse and high-purity nano-vanadium dioxide powder with simple synthesis process and short flow process, which can directly prepare M phase. The method of vanadium dioxide nanopowder: a, dissolve vanadyl sulfate in deionized water, configure the vanadyl sulfate solution of vanadium source, and ultrasonically disperse, then add equimolar barium chloride to the vanadyl sulfate solution, After fully reacting, filter out the barium sulfate precipitation that generates, obtain the vanadyl dichloride precursor solution; b, the precursor solution prepared in step a is placed in the ultrasonic nebulizer and atomized to produce mist droplets, carried by the carrier gas The above-mentioned small droplets are collected by a vertical tube furnace and a high-voltage electrostatic collector, and then the collected powder is placed in deionized water, and subjected to ultrasonic treatment and filtration, and the M-phase vanadium dioxide nano-powder is obtained after vacuum drying body. The invention is especially suitable for preparing M-phase vanadium dioxide nanometer powder.

Description

Technical field [0001] The present invention relates to the field of vanadium dioxide powder preparation, in particular a method of direct preparation of M-phase vanadium dioxide nano-powder by ultrasonic spray pyrolysis. Background [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 isomers. where VO 2 (M) that is, M phase vanadium dioxide is currently the most studied phase, and it has been confirmed that light, heat, electricity, stress, etc. can induce VO 2 (M) A phase transition occurs, accompanied by a huge change in crystal structure, resistivity, optics, and other characteristics. When the phase transition occurs, its crystal structure changes from a single oblique phase to a quadrangular rutile phase, and the resistivity undergoes a mutation of more than 3 orders of magnitude, from the semiconductor before the phase change to a metal; in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02B82Y40/00
CPCC01G31/02B82Y40/00C01P2004/64
Inventor 辛亚男彭穗刘波姚洁
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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