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Crystal material, and preparation method and application thereof

A technology of crystal materials and reactions, applied in the direction of polycrystalline material growth, crystal growth, chemical instruments and methods, etc., can solve problems such as complex structures, and achieve the effect of simple preparation process, good combination of reflection and radiation comprehensive performance, and excellent performance

Active Publication Date: 2018-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves upon existing technologies by combining different types of light absorption (UVA) or near-IR emission (Near IR), resulting in improved thermal insulation for various applications such as building construction.

Problems solved by technology

This patents describes different ways to reduce carbon dioxide (CO2) levels caused due to climate change. One way involves reducing CO2 production during times when there are no sources of light like nightfall. Another approach focuses on improving indoor air quality with active ventilation systems such as fans and ceiling tiles. However, these methods require expensive equipment and may increase negative effects over longer periods of time.

Method used

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  • Crystal material, and preparation method and application thereof
  • Crystal material, and preparation method and application thereof
  • Crystal material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 2.144g magnesium acetate tetrahydrate and 1.64g phosphorous acid solid powder according to the molar ratio of 0.5:1, pour them into a beaker, dissolve them with deionized water, add a magnetic stirring bar to stir, and adjust the speed to 400 rpm , add 5ml cyclohexylamine after 15 minutes, cover with plastic wrap and then stir for 15 minutes to obtain a uniform emulsion, wherein the volume ratio of cyclohexylamine to emulsion is 1:12; Put the turbid liquid into the reaction kettle, then place the reaction kettle in an oven, set the temperature of the oven at 140°C, and the reaction time is 2000 minutes. After the reaction is complete, take it out, wash and filter, dry the sample on the filter paper at 80°C for 5 hours, and grind to obtain a sample with uniform particle size.

[0033] The test result of the emissivity of the sample in the mid-to-far infrared band of 2.5-25 μm is 0.914, and the reflectance of the sample in the ultraviolet-visible-near-infrared band ...

Embodiment 2

[0038] Weigh 4.289g of magnesium acetate tetrahydrate and 1.64g of phosphorous acid solid powder according to the molar ratio of 1:1, pour them into a beaker, dissolve them with deionized water, add a magnetic stirring bar to stir, and adjust the speed to 300 rpm After 15 minutes, add 12.5ml cyclohexylamine, cover with plastic wrap and then stir for 15 minutes to obtain a uniform emulsion, wherein the volume ratio of cyclohexylamine to emulsion is 1:4.8; Put the emulsion into the reaction kettle, then place the reaction kettle in an oven, set the oven temperature to 160°C, and the reaction time to 2000 minutes. After the reaction is complete, take it out, wash and filter, dry the sample on the filter paper at 100°C for 3 hours, and grind to obtain a sample with uniform particle size.

[0039] The test result of the emissivity of the sample in the mid-to-far infrared band of 2.5-25 μm is 0.928, and the reflectance of the sample in the ultraviolet-visible-near-infrared band of 0...

Embodiment 3

[0042] Weigh 8.578g of magnesium acetate tetrahydrate and 1.64g of phosphorous acid solid powder according to the molar ratio of 2:1, pour them into a beaker, dissolve them with deionized water, add a magnetic stirring bar to stir, and adjust the speed to 200 rpm , add 10ml cyclohexylamine after 20 minutes, cover with plastic wrap and then stir for 20 minutes to obtain a uniform emulsion, wherein the volume ratio of cyclohexylamine to the emulsion is 1:6; the uniform emulsion Put the turbid liquid into the reaction kettle, then place the reaction kettle in an oven, set the oven temperature to 180°C, and the reaction time to be 2000 minutes. After the reaction is complete, take it out, wash and filter, dry the sample on the filter paper at 110°C for 2 hours, and grind to obtain a sample with uniform particle size.

[0043] The test result of the emissivity of the sample in the mid-to-far infrared band of 2.5-25 μm is 0.933, and the reflectance of the sample in the ultraviolet-v...

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Abstract

The invention discloses a crystal material. The chemical formula is Mg11(HPO3)8(OH)6, the reflectivity in an ultraviolet-visible-near infrared band of 0.2-2.5 microns is 88% or above, and simultaneously the emissivity in a far infrared band of 2.5-25 microns is 0.90 or above. The invention also discloses a preparation method of the crystal material. The preparation method comprises the following steps: on the basis of raw materials of magnesium acetate tetrahydrate and phosphorous acid, simultaneously adding a cyclohexylamine template agent, and preparing the Mg11(HPO3)8(OH)6 crystal powder bya hydrothermal synthesis method. According to the crystal material provided by the invention, comprehensive performance of reflection and radiation can be well combined, the actual cooling effect is2-10 DEG C better than the common heat reflecting material titanium dioxide in the market, and the crystal material can be well applied to the field of heat reflection infrared radiation.

Description

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Claims

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Application Information

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Owner SOUTH CHINA UNIV OF TECH
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