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Solar selective absorption film and sol-gel preparation method thereof

A technology of selective absorption and solar energy, applied in solid-state chemical plating, metal material coating process, coating, etc., can solve the problems of complex operation process and high equipment requirements, and achieve great application potential, low equipment requirements, and easy availability of raw materials Effect

Inactive Publication Date: 2015-02-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All the above methods have been Al 2 o 3 For ceramic substrates, it is necessary to prepare transition metal M sol and aluminum sol separately and then mix them. The operation process is relatively complicated and the reduction of transition metal particles is achieved by heat treatment in an inert atmosphere at high temperature, which requires relatively high equipment requirements.

Method used

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  • Solar selective absorption film and sol-gel preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) 0.272g of silver nitrate was added to 50ml of absolute ethanol, stirred for 30min until completely dissolved to obtain a clear silver nitrate solution;

[0017] (2) Under stirring, add 2.0g copper acetate and 2.19g tetraethylenepentamine successively to the silver nitrate solution obtained in step (1), and keep stirring to obtain a clear sol for 2 hours;

[0018] (3) In the clear sol obtained in step (2), add 0.3g hydroxypropyl cellulose and continue to stir for 3h to obtain the sol for coating;

[0019] (4) Use the coating sol obtained in step (3) to pull and plate a layer of film on a clean stainless steel sheet (the pulling speed is 80mm / min), dry it at 80°C and put it in a muffle furnace at 500°C Baking for 30 minutes, the Ag-CuO solar energy selective absorption film is obtained.

[0020] The prepared film is uniform and free of cracks, with an absorptivity of 0.86 and an emissivity of 0.04.

Embodiment 2

[0022] (1) 0.14g silver nitrate was added in 50ml n-butanol, stirred for 30min until completely dissolved to obtain a clear silver nitrate solution;

[0023] (2) Under stirring state, add 2.0g copper acetate and 1.58g triethylenetetramine successively in the silver nitrate solution that obtains in step (1), keep stirring to obtain clear sol for 2 hours;

[0024] (3) In the clear sol obtained in step (2), add 0.2g hydroxypropyl cellulose and continue to stir for 2h to obtain the sol for coating;

[0025] (4) Use the coating sol obtained in step (3) to pull and plate a layer of film on a clean aluminum sheet (the pulling speed is 80mm / min), dry it at 80°C and put it in a muffle furnace at 500°C Baking for 30 minutes, the Ag-CuO solar energy selective absorption film is obtained.

[0026] The prepared film is uniform and free of cracks, with an absorptivity of 0.82 and an emissivity of 0.03.

Embodiment 3

[0028] (1) 1.09g of silver nitrate was added to 50ml of methanol, stirred for 40min until completely dissolved to obtain a clear silver nitrate solution;

[0029] (2) Under stirring state, add 2.0g copper acetate and 5.71g pentaethylene hexamine successively in the silver nitrate solution that obtains in step (1), keep stirring and obtain clear sol for 2 hours;

[0030] (3) In the clear sol obtained in step (2), add 0.25g hydroxypropyl cellulose and continue to stir for 2.5h to obtain the sol for coating;

[0031] (4) Use the coating sol obtained in step (3) to pull and plate a layer of film on a clean aluminum sheet (the pulling speed is 80mm / min), dry it at 80°C and put it in a muffle furnace at 500°C Baking for 30 minutes, the Ag-CuO solar energy selective absorption film is obtained.

[0032] The prepared film is uniform and free of cracks, with an absorptivity of 0.85 and an emissivity of 0.03.

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Abstract

The invention belongs to the field of solar heat utilization, and particularly relates to a solar selective absorption film formed by dispersing nano silver in a copper oxide dielectric base and a sol-gel preparation method thereof. The preparation method comprises the following steps: by using alcohol as a solvent, fatty amine as a chelator and copper acetate and silver nitrate as raw materials, chelating to prepare a clear sol, adding a film former, and stirring to obtain a sol for coating; and carrying out dip coating on the prepared sol base, and carrying out heat treatment. The prepared single-layer Ag-CuO layer has favorable absorptivity and huge application potential.

Description

technical field [0001] The invention belongs to the field of solar thermal utilization, in particular to a solar selective absorption film in which nano-silver is dispersed in a copper oxide dielectric matrix and a sol-gel preparation method thereof. Background technique [0002] The solar selective absorption film or coating, as the core component of the solar collector, can effectively improve the collector's heat collection efficiency, operating temperature and cost performance of the system. An ideal light-to-heat conversion film has a high absorption rate for visible light and near-infrared radiation, and a low emissivity. At present, the absorbing film prepared based on electrochemical method and vacuum deposition has excellent optical properties and stability, and has been widely used in commercially produced solar collectors; however, the electrochemical method has the disadvantage of large environmental pollution, and vacuum deposition Although the method has littl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C20/08
Inventor 陈若愚何梦瑶王红宁刘小华
Owner CHANGZHOU UNIV