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A kind of preparation method of microwave plasma modified vanadium dioxide powder

A microwave plasma, vanadium dioxide technology, applied in vanadium oxide and other directions, can solve the problems of heat loss, increased heating energy consumption, increased cooling energy consumption, etc., and achieves the effects of excellent thermochromic performance and high energy saving and cost-effectiveness.

Inactive Publication Date: 2015-12-30
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The glass window is the main channel for heat to enter and exit the building. In summer, the sunlight passes through the window glass to heat the room, and the excessive heat causes a great increase in cooling energy consumption; in winter, the indoor heat is lost in the form of heat radiation and heat conduction, resulting in heating energy increase in consumption

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  • A kind of preparation method of microwave plasma modified vanadium dioxide powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of M-type vanadium dioxide powder

[0020] A. Weigh 1.3785g vanadium oxychloride (VOCl 2 ) Add 40ml of deionized water and stir evenly to a blue solution. Titrate with a 50ml volumetric flask to obtain vanadium oxychloride (VOCl 2 ) The concentration is 0.2mol / L.

[0021] B. Take a certain volume of vanadium oxychloride solution, slowly add concentrated ammonia water dropwise, stirring while adding dropwise, the blue solution gradually forms an earthy yellow precipitate. When pH=7, the precipitation is no longer formed in large quantities, and the dripping of concentrated ammonia water is stopped. Place the turbid sedimentation liquid in an ultrasonic cleaner and break for 10 minutes. Then filter, wash, vacuum dry at 80°C, and grind to obtain VO(OH) 2 Precursor powder.

[0022] C. Weigh a certain quality of the precursor powder into the tubular resistance furnace, 2 Pyrolysis in an atmosphere with a pyrolysis temperature of 600° C. and a holding time of 60 m...

Embodiment 2

[0027] (1) Preparation of M-type vanadium dioxide powder

[0028] A. Weigh 1.3785g vanadium oxychloride (VOCl 2 ) Add 40ml of deionized water and stir evenly to a blue solution. Titrate with a 50ml volumetric flask to obtain vanadium oxychloride (VOCl 2 ) The concentration is 0.2mol / L.

[0029] B. Take a certain volume of vanadium oxychloride solution, slowly add concentrated ammonia water dropwise, stirring while adding dropwise, the blue solution gradually forms an earthy yellow precipitate. When pH=7, the precipitation is no longer formed in large quantities, and the dripping of concentrated ammonia water is stopped. Place the turbid sedimentation liquid in an ultrasonic cleaner and break for 10 minutes. Then filter, wash, vacuum dry at 80°C, and grind to obtain VO(OH) 2 Precursor powder.

[0030] C. Weigh a certain quality of the precursor powder into the tubular resistance furnace, 2 Pyrolysis in the atmosphere, the pyrolysis temperature is 500 ℃, and the holding time is 120 ...

Embodiment 3

[0035] (1) Preparation of M-type vanadium dioxide powder

[0036] A. Weigh 1.3785g vanadium oxychloride (VOCl 2 ) Add 40ml of deionized water and stir evenly to a blue solution. Titrate with a 50ml volumetric flask to obtain vanadium oxychloride (VOCl 2 ) The concentration is 0.2mol / L.

[0037] B. Take a certain volume of vanadium oxychloride solution, slowly add concentrated ammonia water dropwise, stirring while adding dropwise, the blue solution gradually forms an earthy yellow precipitate. When pH=7, the precipitation is no longer formed in large quantities, and the dripping of concentrated ammonia water is stopped. Place the turbid sedimentation liquid in an ultrasonic cleaner and break for 10 minutes. Then filter, wash, vacuum dry at 80°C, and grind to obtain VO(OH) 2 Precursor powder.

[0038] C. Weigh a certain quality of the precursor powder into the tubular resistance furnace, 2 Pyrolysis in the atmosphere, the pyrolysis temperature is 550°C, and the holding time is 90 m...

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Abstract

The invention relates to a preparation method of microwave plasma modified vanadium dioxide powder. The preparation method comprises the following steps: putting M-shaped vanadium dioxide powder into a microwave plasma holding cavity and carrying out plasma surface modification, wherein microwave plasma is methane and nitrogen, the microwave input power is controlled to be 150-200 W, the pressure intensity in the cavity is 1.5-2 KPa, and the modification time is 30-90 minutes. The preparation method has the main advantages that a VO2 nanometer material which takes a modified carbon-doped layer as a surface layer and adopts a core-shell structure is prepared by a plasma modification technology, and by the full utilization of the transformation induced effect of the modified layer, the low temperature phase change of the VO2 nanometer powder is realized, so that the excellent thermochromic property is obtained; compared with a piece of energy-saving coated glass with the advantages of low radiation, heat reflection, electrochromism, photochromism and the like, a piece of smart glass of which the sunlight transmittance can be adjusted according to the temperature has the advantages of trans-regional and multi seasonal adaptability and higher energy conservation cost performance.

Description

Technical field [0001] The invention belongs to the technical field of material physics, and specifically relates to a preparation method of microwave plasma modified vanadium dioxide powder. Background technique [0002] The increasingly severe energy crisis and environmental pollution problems come from the continuous increase in global total energy consumption and greenhouse gas emissions. At present, building energy consumption accounts for about 30% of total energy consumption in society, and 33% of global greenhouse gas emissions are also related to building energy consumption. As a developing country, this problem is even more prominent in my country. There are many high-energy-consuming buildings in China (about 60 billion square meters). The energy consumption per unit building area is 2 to 3 times that of developed countries. The total building energy consumption is large (about 4.5 100 million tons of standard coal, equivalent to the annual power generation of 45 Three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
Inventor 徐慢王树林季家友赵静薛俊沈凡曹宏石和彬陈常连安子博王亮祝云
Owner WUHAN INSTITUTE OF TECHNOLOGY