Inorganic acid based collosol for preparing solar energy photo-thermal conversion absorbing membrane

A light-to-heat conversion and absorbing film technology, which is applied in the direction of solid-state chemical plating, metal material coating process, coating, etc., can solve the problems of high cost and danger, and achieve low cost, no pollution to the environment, and easy access to raw materials. The effect

Inactive Publication Date: 2009-09-02
FUZHOU UNIV
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  • Abstract
  • Description
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Problems solved by technology

In addition, it is also reported that the film is prepared by sol-gel method. The sol is prepared with aluminum tri-sec-butoxide and nickel 2-ethylhexanoate, which is calcined at 1200°C to form NiAl204, and then reduced with H2 at 950°C for 5 hours[ J.Appl.Phys., 821189-1195 (1997)], this method cost is higher, also has danger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0006] The preparation method of sol is as follows:

[0007] (1) Add 3-5g of organic or inorganic aluminum salt powder into 80-120mL of absolute ethanol or fatty alcohol, reflux and heat up to 50-80°C under stirring, continue to stir and reflux for 0.5-1.5h, and add 2-3mL of chelating agent and 4-6mL inorganic acid, stirred and refluxed for 2.5-3.5h to obtain aluminum sol;

[0008] (2) Take 80-120mL of absolute ethanol or fatty alcohol, add 1-3mL of chelating agent and 5-6g of nickel salt successively under stirring, and stir for 0.5-1.5h to obtain nickel sol;

[0009] (3) Measure the above two sols according to the molar ratio of Ni and Al, and stir them sufficiently to obtain a nickel-aluminum mixed sol; the molar ratio of Ni and Al can be any ratio, generally 1:99-99:1.

[0010] The prepared sol is used for coating on a smooth metal substrate, the sol is coated on a smooth metal substrate, and Ni-Al with different nickel contents is obtained after heat treatment 2 o 3 Th...

Embodiment 1

[0017] best practice

[0018] 1. Add 4.08g of aluminum isopropoxide powder into 100mL of absolute ethanol, reflux with stirring and raise the temperature to 70°C, continue to stir and reflux for 1h, add 2.5mL of acetylacetone and 5.18mL of HCl, stir and reflux for 3h to obtain aluminum sol.

[0019] 2. Take 100mL of absolute ethanol, add 2mL of acetylacetone and 5.8g of nickel nitrate hexahydrate in sequence under stirring, and stir for 1 hour to obtain nickel sol.

[0020] 3. Mix 2mL of aluminum sol and 8mL of nickel sol, and stir evenly to obtain a mixed sol with a nickel content of 20%.

[0021] Using the spin coating method, the mixed sol is coated on the metal aluminum sheet, and after heat treatment, Ni-Al with a nickel content of 80% is obtained. 2 o 3 nanocomposite films. The surface of the film is uniform, without microcracks, and the solar absorption rate can reach 0.82.

Embodiment 2

[0023] 1. Add 4.08g of aluminum isopropoxide powder into 100mL of absolute ethanol, reflux with stirring and raise the temperature to 70°C, continue to stir and reflux for 1h, add 2.5mL of acetylacetone and 5.18ml of HCl, stir and reflux for 3h to obtain aluminum sol.

[0024] 2. Take 100 mL of absolute ethanol, add 2 mL of acetylacetone and 5.8 g of nickel nitrate hexahydrate in sequence under stirring, and stir for 1 hour to obtain a nickel sol.

[0025] 3. Mix 6mL of aluminum sol and 4mL of nickel sol, and stir evenly to obtain a mixed sol with a nickel content of 50%.

[0026] The mixed sol is coated on the metal aluminum sheet, and after heat treatment, Ni-Al with a nickel content of 50% is obtained 2 o 3 nanocomposite films. The surface d of the film is uniform without microcracks. The solar absorption rate can reach 0.77.

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Abstract

The invention provides an inorganic acid based collosol for preparing a solar energy photo-thermal conversion absorbing membrane: the collosol is prepared from the raw materials of organic or inorganic aluminium salt, nickel salt and chelating agent, wherein the raw materials are processed by the steps of alcoholysis and condensation reaction in ethanol or fatty alcohol, inorganic acid is used as peptizing agent for preparing aluminum collosol, and the aluminum collosol needs to be mixed with nickel collosol to prepare mixed collosol. The invention has the advantages of simple preparation method and easy raw material acquisition, the prepared membrane can be used for a thermal collection absorbing layer for the solar energy photo-thermal conversion, and the invention has low cost and does not pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and more specifically relates to a solar light-to-heat conversion absorbing film sol prepared based on inorganic acid. Background technique [0002] For decades, solar spectrum selective absorption films have been a very active research topic in the field of solar thermal utilization technology. At present, the industrialized solar spectrum selective absorption thin film is mainly prepared by magnetron sputtering method. Since this method requires high vacuum, it requires expensive production equipment and high equipment maintenance costs, and the input cost is large, which limits Promotion of solar thermal utilization. Nickel-alumina composite film is a kind of cermet film, which has good selective absorption, and is generally used in the absorbing layer of solar light-to-heat conversion. At present, the preparation method of Ni-Al203 film is mainly magnetron sputtering technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/16C23C20/08
Inventor 赵剑曦蒋家兴姜蓉廖新焕
Owner FUZHOU UNIV
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