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Thermochromic composite powder with core-shell structure and preparation method of powder

A thermochromic and composite powder technology, which is applied in heat treatment technology, wet chemical treatment technology, and hydrothermal treatment technology, can solve the problems of losing thermochromic properties, achieve improved visible light transmittance, excellent performance, and enhanced chemical stability sexual effect

Inactive Publication Date: 2013-08-14
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0010] The rutile vanadium dioxide at normal temperature is very stable in vacuum or inert atmosphere, but it is easy to absorb water molecules in the atmosphere and be further oxidized to vanadium pentoxide, losing its original thermochromic properties

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  • Thermochromic composite powder with core-shell structure and preparation method of powder
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  • Thermochromic composite powder with core-shell structure and preparation method of powder

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preparation example Construction

[0042] The invention relates to a "rattle" type thermochromic hollow structure and a preparation method thereof, so as to reduce VO 2 The particle size of the powder reduces the refractive index of the film, reduces the heat exchange between indoor and outdoor, and increases the VO 2 Optical properties of the base film. "Ratter" type structure refers to a structure with a solid core in a hollow shell, also known as a core-shell material with a movable core, which can be regarded as a special hollow material.

[0043] Specifically, the structure of a "Rattle" type thermochromic powder is first provided, the movable inner core part is vanadium dioxide thermochromic powder, the outer shell is a transparent oxide, and the space between the outer shell and the inner core is air or vacuum. In order to ensure good optical performance, the minimum dimension in the three-dimensional dimension of the "rattle" type structure must be below 200 nanometers, preferably below 100 nanometers,...

Embodiment 1

[0054] Weigh 1.0g of vanadium pentoxide, 5.0ml of ethylene glycol and 40ml of deionized water and place it in a hydrothermal kettle, keep at 160-320°C for 1-48 hours, and cool to obtain blue-black powder, see figure 1 and figure 2 , which respectively show the SEM image and XRD image of vanadium dioxide in the present embodiment, indicating that it is the B phase;

[0055] Then put the blue-black powder into a 1:4 weight percent solution of 50 ml of deionized water and absolute ethanol, after ultrasonic dispersion for 30 minutes, adjust the pH to 11 with ammonia water, and slowly add 1 mL of ethyl orthosilicate to it, stir After 4 hours, it was filtered, washed and dried at 110 °C for 2 hours to obtain a silica-wrapped vanadium dioxide core-shell structure (VO 2 SiO 2 ), see image 3 , which shows the SEM image of the B-phase of silica-coated vanadium dioxide in the present implementation;

[0056] Weigh a small amount of the above silica-coated vanadium dioxide powder (V...

Embodiment 2

[0060] Weigh 1.0g of vanadium pentoxide and 1.8ml of hydrazine solution, place in 40ml of deionized water and stir until completely dissolved to obtain a tetravalent vanadium ion precursor solution, keep at 160-320 ° C for 1-48 hours, and cool to obtain black powder , see Image 6 and Figure 7 , which respectively show the SEM image and XRD image of vanadium dioxide in the present embodiment, indicating that it is M phase;

[0061] Then put the black powder into a 1:4 weight percent solution of 50 ml of deionized water and absolute ethanol, after ultrasonic dispersion for 30 minutes, adjust the pH to 11 with ammonia water, and slowly add 1 mL of ethyl orthosilicate to it, stir for 4 After 1 hour, it was filtered, washed and dried at 110 °C for 2 hours to obtain a silica-wrapped vanadium dioxide (M) core-shell structure (VO2 SiO 2 ), see Figure 8 , which shows the SEM image of the silica-coated vanadium dioxide M phase in the present implementation;

[0062] The obtained ...

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Abstract

The invention relates to thermochromic composite powder with a core-shell structure and a preparation method of the powder. The thermochromic composite powder is a core-shell structure, wherein a core is M-phase vanadium dioxide, the shell is a transparent oxide and the shell and the core are separated by using air or in a vacuum manner.

Description

technical field [0001] The invention relates to an optimization method for thermochromic functional composite nano-powders in the fields of chemical industry and materials, and provides a thermochromic composite material with a core-shell structure ("Rattle" type) with a movable inner core and a preparation method thereof , involving hydrothermal treatment technology, heat treatment technology and wet chemical treatment technology, and belongs to the field of new energy-saving and environmental protection materials. Background technique [0002] Due to the depletion of global resources, energy conservation and emission reduction has become the top priority of all countries. It is estimated that building energy consumption accounts for more than 1 / 3 of the total social energy consumption. Therefore, building energy conservation is the key to reducing energy consumption. Since a large part of building energy consumption is used for air conditioning, more than half of the ener...

Claims

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Application Information

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IPC IPC(8): C09K9/00
Inventor 金平实周奕杰黄爱斌纪士东罗宏杰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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