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A thermochromatic nanocomposite powder with locally modified spectrum and its preparation method

A nano-composite powder, local technology, applied in the direction of coating, etc., to achieve the effect of low cost, expanded applicability, improved stability and oxidation resistance

Inactive Publication Date: 2016-06-08
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modification of the spectrum of the thin film formed by vanadium dioxide powder is still a blank

Method used

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  • A thermochromatic nanocomposite powder with locally modified spectrum and its preparation method

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preparation example Construction

[0030] The dispersing aid used in the above-mentioned preparation process is polyvinyl alcohol, polyvinylpyrrolidone, organic silicon surfactant, sodium dodecylsulfonate, polyacrylic acid, silane coupling agent, titanate coupling agent or well-known in the industry One or more of the dispersing aids. Dispersion aids are mainly used to reduce the surface tension of the solution and improve the wetting of the solvent on the surface of the powder, thereby improving the dispersion effect. The amount of the dispersing aid added in steps (1) and (3) is 0.02-2% by weight of the dispersion medium; preferably 0.05-1% by weight.

[0031] The raw materials and reagents used in the above method can be purchased from the market or synthesized by traditional chemical transformation. Unless otherwise defined or stated, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equ...

Embodiment 1

[0034] First put 2g of VO with a particle size of 80nm 2 (M) Add 10 g of ethanol containing 0.02% by weight of polyvinylpyrrolidone, stir for 30min; add 5ml of an aqueous solution of 0.1% by weight of silver nitrate and 50ml of an aqueous solution of 1% by weight of sodium borohydride, and stir for 5 hours to obtain a gray suspension , after centrifugal precipitation and vacuum drying, VO with Ag thickness of 10nm was obtained 2 Ag nanocomposite powder; then disperse 0.2g of the powder into 1g of ethanol containing 0.02% by weight of polyvinylpyrrolidone, stir for 1 hour; adjust the pH value to 3, add 1ml of tetraethyl orthosilicate, and stir for 120 minutes , dried at 110°C for 2 hours after centrifugation to obtain SiO 2 VO with a thickness of 100nm 2 AgSiO 2 powder.

Embodiment 2

[0036] First, 2 g of VO with a phase transition temperature of 60 degrees and a particle size of 40 nm 2 (M) Add 30 g of toluene containing 0.04% polyvinyl alcohol, stir for 30 min; add 5 ml of an aqueous solution of 2% by weight of silver nitrate and 50 ml of an aqueous solution of 2% by weight of sodium borohydride, and stir for 5 hours to obtain a gray suspension. After centrifugal precipitation and vacuum drying, VO with an Ag layer thickness of 2 nm was obtained. 2 Ag nanocomposite powder; then disperse 0.2g of this powder into 3g of chloroform containing 0.04% by weight of polyvinyl alcohol, stir for 1 hour, adjust the pH value to 3; add 10ml of saturated aqueous solution of zinc nitrate, and stir for 120 minutes Afterwards, centrifuge and dry at 110°C for 2 hours, ZnO with a thickness of 50nm in VO 2 Powder of AgZnO.

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Abstract

The invention provides spectrum locally-modified hot color nano-composite powder and a preparation method thereof. The powder is of a multilayer composite core-shell structure which consists of a V2O layer, a precious metal layer and a transparent oxide layer, wherein the V2O layer serves as a core layer; the precious metal layer and the transparent oxide layer are respectively positioned on the second layer or the third layer. According to the spectrum locally-modified hot color nano-composite powder and the preparation method thereof, the precious metal layer and the transparent oxide layer coat the surfaces of V2O nano-particles, so that the stability of the V2O nano-particles can be improved, the spectral characteristics of V2O nano-powder can be adjusted, and the transmission color and the reflection color of the V2O nano-powder are adjusted; therefore, the aim of improving the color of the V2O powder is fulfilled. The powder can be widely applied to the fields of heat insulation coatings, lamination and the like, can be applied to an intelligent energy-saving coating, and can also be applied to the heat insulation places of glass, outer walls and the like.

Description

technical field [0001] The invention relates to a thermochromic functional composite nano-powder in the fields of chemical engineering and materials and a preparation method thereof. technical background [0002] In my country, building energy consumption accounts for about 30% of the total social energy consumption, of which heating and air conditioning energy consumption accounts for 55% of building energy consumption. In modern buildings, glass accounts for an increasing proportion of the exterior wall area. It is estimated that the heat transfer through glass windows accounts for 48% and 71% respectively in winter and summer. If the air conditioner is used to adjust the indoor temperature, the cooling temperature is increased by 2 degrees, and the cooling load is reduced by about 20%; the heating temperature is lowered by 2 degrees, and the heating load is reduced by about 30%. Layers can drastically reduce energy consumption. [0003] Vanadium dioxide is a material th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24
Inventor 徐刚肖秀娣柴冠麒张华
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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