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Intermetallic compound-aerogel composite material, and preparation method and application thereof

A technology of intermetallic compounds and composite materials, which is applied in the composite materials of intermetallic compounds and aerogels and their preparation and application fields, can solve the problems of limiting the application of photothermal materials, low material temperature, and reduced efficiency, and achieve source distribution Wide, high temperature, low heat dissipation effect

Active Publication Date: 2018-08-03
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sunlight is converted into heat in the photothermal material, but part of the heat is dissipated in the air, resulting in a decrease in efficiency
Not only that, the dissipation of heat also causes the material temperature of photothermal materials to be low under light, which limits the application of photothermal materials in other fields, such as the field of thermocatalysis
The catalytic temperature of many thermal catalysis is around 200°C, which cannot be achieved by current photothermal materials.

Method used

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  • Intermetallic compound-aerogel composite material, and preparation method and application thereof
  • Intermetallic compound-aerogel composite material, and preparation method and application thereof
  • Intermetallic compound-aerogel composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Fe 3 Si intermetallic compound SiO 2 Airgel composites:

[0041] (1) Dissolve 10ml of tetraethyl orthosilicate in ethanol, add 300ul of hydrochloric acid and 600ul of deionized water, and stir at 85°C for 4 hours to obtain a silica sol; add 10g of PEG2000 and 3g of Ferric nitrate, after the above medicines are all dissolved, add triethanolamine with an amount six times that of iron, then quickly add 5ml of ammonia water to the above mixed solution, the sol will gel rapidly, and obtain iron hydroxide and silicon dioxide. Gel; the gel is sealed and aged at a constant temperature of 65°C for several days, then taken out and dried and calcined in a horse boiling furnace for 6 hours under the condition that the temperature rises from 5°C to 500°C per minute to obtain iron-doped silica gas Gel material; then annealed at 400°C under a hydrogen environment to obtain an iron-silicon intermetallic compound silica airgel composite material. Soak the composite material with a 10...

Embodiment 2

[0048] Fe 2 Si intermetallic compound SiO 2 Airgel composites:

[0049] (1) Dissolve 8ml of methyl orthosilicate in ethanol, add 300ul of hydrochloric acid and 600ul of deionized water, and stir at 85°C for 4 hours to obtain a silica sol; add 0.05g of polyethylene to the above sol Alcohol and 1.5g ferric chloride, after the above medicines are all dissolved, add the diethanolamine of ten times the amount of iron material, then quickly add 5ml ammonia water to the above mixed solution, the sol will gel rapidly, and obtain iron-doped di Silica gel; seal the gel and age it in a constant temperature environment of 70°C for several days, then take it out and dry it and calcinate it in a horse boiling furnace for 6h, the condition is that the temperature rises from 5°C to 500°C per minute to obtain iron-doped dioxide Airgel material of silicon; then annealed at 500°C under hydrogen environment to obtain iron-silicon intermetallic compound silicon dioxide airgel photothermal materi...

Embodiment 3

[0053] FeSi 2 intermetallic compound SiO 2 Airgel composites:

[0054] (1) Dissolve 10ml of methyl orthosilicate in ethanol, add 300ul of hydrochloric acid and 600ul of deionized water, and stir at 85°C for 4 hours to obtain a silica sol; add 1g of ferric acetate and 3 Gram carbon particles and ultrasonically disperse them with a cell pulverizer. After the drug is dissolved, add ethanolamine in an amount four times that of iron, and then quickly add 5ml of ammonia water to the above mixed solution, and the sol will quickly gel. Seal the gel and age it at a constant temperature of 65°C for a few days, then take it out and dry it and calcinate it in a horse boiling furnace for 6 hours under the condition that the temperature rises from 5°C to 600°C per minute to obtain an iron-doped silica airgel material; Then annealing at 550° C. under a hydrogen environment to obtain an iron-silicon intermetallic compound silicon dioxide airgel photothermal material. The material was soake...

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Abstract

The invention discloses an intermetallic compound-aerogel composite material, and a preparation method and an application thereof. The material is of a porous structure and is prepared by sol-gel andhydrogen annealing. The composite material has total-solar spectral light absorption, low radiation properties and extremely low heat dissipation and has the thermal conductivity coefficient as low as0.05 W*m<-1>*K<-1>. Because of the characteristics of high light absorption, low radiation and low heat dissipation of the material, the composite material can absorb sunlight, convert the sunlight into heat and store the heat inside the material. The material is irradiated under 2 beams of standard sunlight, and the self temperature can reach 260 DEG C. After hydrophobic treatment, the materialcan float on the water surface, and the air-water interface temperature can reach 115 DEG C under standard sunlight irradiation. The material can be used as a photothermal material widely applied in photothermal water evaporation, seawater desalination, chemical substance separation and purification, thermal catalysis and the like. The material has the advantages of wide sources of raw materials,low preparation cost, stable corrosion resistance and environmental friendliness, and is suitable for industrialized production.

Description

technical field [0001] The invention relates to a novel composite material of intermetallic compound and airgel, its preparation method and its application in light and heat. Background technique [0002] With population growth, global warming and environmental pollution, every continent is experiencing fresh water shortages. Desalination of sea and brackish water appears to be the only viable way to increase supply and solve these problems. Currently, the two most common methods for extracting freshwater from seawater and brackish water are desalination by membrane osmosis (RO) and thermal distillation (TD). RO requires a large amount of electricity, which does not meet the current energy-saving and environmental protection requirements. Direct absorption of sunlight into heat can also drive TD, whereas in a variety of solar TD approaches, sunlight absorption is converted into heat and localized at the air-water interface. This interface is where the surface free energy ...

Claims

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Application Information

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IPC IPC(8): C01B33/158C01B33/159
CPCC01B33/1585C01B33/159C01P2002/72C01P2002/84C01P2004/03C01P2006/12C01P2006/16
Inventor 不公告发明人
Owner HEBEI UNIVERSITY
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