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Double-layer aerogel as well as preparation method and application thereof as solar evaporator

A solar evaporator, aerogel technology, applied in heat exchange equipment, lighting and heating equipment, etc., can solve the problem of limited solar energy efficiency of clean water, and achieve excellent photothermal conversion performance, good thermal management performance, and simple preparation. Effect

Active Publication Date: 2019-09-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to achieve design optimization in terms of enhanced light absorption, local heat concentration, water supply, and steam dissipation is still a difficult problem. The rate of clean water produced by solar-driven water evaporation and the efficiency of utilizing solar energy are still very limited.

Method used

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  • Double-layer aerogel as well as preparation method and application thereof as solar evaporator
  • Double-layer aerogel as well as preparation method and application thereof as solar evaporator
  • Double-layer aerogel as well as preparation method and application thereof as solar evaporator

Examples

Experimental program
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Effect test

Embodiment 1

[0052] A kind of preparation method of the water supply layer of double-layer airgel

[0053] Step (1), adding preparation raw materials into the dispersion medium, stirring evenly under dark conditions until the preparation raw materials are completely dissolved, to obtain a transparent acrylamide precursor solution; wherein, the dispersion medium is water, and the preparation raw materials include polymerization reaction A monomer, a chemical crosslinking agent and a photoinitiator, the polymerization reaction monomer is acrylamide, the chemical crosslinking agent is methylene bisacrylamide, and the photoinitiator is azobisisobutylamidine hydrochloride Specifically, acrylamide solution (AAm / H2O) with a concentration of 100 mg / ml, methylenebisacrylamide (MBAA) with a concentration of 9.72 mg / ml, and azobisisobutyramide with a concentration of 12.5 mg / ml were prepared. Add hydrochloride (V-50) into the water solvent, and stir for 1 hour under dark conditions to obtain a transp...

Embodiment 2

[0058] A kind of preparation method of the light-absorbing layer of double-layer airgel

[0059] Step (1), adding preparation raw materials into the dispersion medium, stirring evenly under the condition of avoiding light until the preparation raw materials are completely dissolved, and obtaining a transparent acrylamide precursor solution; wherein, the dispersion medium is water, and the raw materials include polymerization reaction unit body, chemical cross-linking agent and photoinitiator, the polymerization reaction monomer is acrylamide, the chemical cross-linking agent is methylenebisacrylamide, and the photoinitiator is azobisisobutylamidine hydrochloride, Specifically, the acrylamide solution (AAm / H2O) with a concentration of 100 mg / ml, the methylenebisacrylamide (MBAA) with a concentration of 9.72 mg / ml, and the azobisisobutylamidine salt with a concentration of 12.5 mg / ml were prepared. salt (V-50) was added to the water solvent, and stirred for 1 hour under dark con...

Embodiment 3

[0066] A double-layer airgel

[0067] Such as figure 1 Shown, a double-layer airgel, the double-layer airgel is composed of polyacrylamide-carbon nanotube composite airgel as the upper light-absorbing layer and radial hierarchical porous structure as the lower water supply layer The polyacrylamide airgel is composed of polyacrylamide airgel, wherein the upper light-absorbing layer evaporates water through the light-to-heat conversion efficiency under the irradiation of light, thereby providing power for the transport of water in the capillary channels in the lower water supply layer .

[0068] Further, the lower water supply layer is a polyacrylamide airgel with a radially graded porous structure, with millimeter-scale radial divergence channels, micron-scale folds and micropores formed at the pore walls, and nanoscale molecular network grading A porous structure, wherein the millimeter-scale radially divergent channel hierarchical porous structure, the micron-scale folds an...

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Abstract

The invention discloses a double-layer aerogel as well as a preparation method and application thereof as a solar evaporator. The double-layer aerogel consists of a lower layer of a polyacrylamide aerogel and an upper layer of a polyacrylamide-carbon nanotube composite aerogel, wherein the polyacrylamide aerogel is used as a water supply layer and is of a radial classified porous structure; the polyacrylamide-carbon nanotube composite aerogel is used as a light absorption layer; the polyacrylamide aerogel of the radial classified porous structure is mainly prepared by preparing a solution, carrying out radial freezing, carrying out low-temperature ultraviolet radiation cross-linking, and by carrying out freeze drying and pretreatment; and the polyacrylamide-carbon nanotube composite aerogel is mainly prepared by preparing a carbon nanotube dispersion, supporting a layer of arbon nanotubes at the top of the aerogel, and by carrying out freeze drying. In addition, when the double-layer aerogel disclosed by the invention is used as an evaporator, the lower layer of the water supply layer is used for providing water to the upper layer of the light absorption layer, solar energy absorbed by the upper layer of the light absorption layer is converted into heat energy for evaporating the water, then power is provided for water conveying in capillary channels in the lower layer of the water supply layer, and water evaporation purification is achieved.

Description

technical field [0001] The invention belongs to the fields of fluid control, solar seawater desalination and sewage treatment, and in particular relates to a double-layer airgel, a preparation method and its application as a solar evaporator. Background technique [0002] Water is not only the material basis of life but also an important strategic resource. Due to global warming, environmental pollution, population growth, accelerated industrialization and urbanization, water resource issues have become the focus of the international community. Conflicts and wars over water resources have intensified in water-scarce regions such as Asia, Africa and the Middle East. my country is a country short of water resources, and the per capita water resources are only 2,100 cubic meters, which is only 28% of the world's average level. According to United Nations estimates, about 1.5 billion people in 80 countries and regions accounting for 40% of the world's total population are short...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C08J9/28C08J3/24C08J3/28C08K3/04F28F21/06
CPCC08F220/56C08J3/24C08J3/28C08J9/28C08J2333/26C08K3/041F28F21/06C08F222/385
Inventor 刘爱萍许为中吴化平邢赟刘舰杨俊
Owner ZHEJIANG SCI-TECH UNIV
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