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In-situ synthesis method of CsxWO3-SiO2 composite aerogel

A composite airgel and composite gel technology, which is applied in the field of in-situ synthesis of CsxWO3-SiO2 composite airgel, can solve problems such as the uniformity of composite airgel and affect performance, achieve good infrared absorption capacity, improve Pore ​​volume, excellent heat absorption effect

Active Publication Date: 2020-08-28
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, experiments have shown that the preparation of Cs by mechanical dispersion x WO 3 -SiO 2 There is a big problem with the uniformity of the composite airgel, which affects its full performance to a certain extent.

Method used

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  • In-situ synthesis method of CsxWO3-SiO2 composite aerogel
  • In-situ synthesis method of CsxWO3-SiO2 composite aerogel
  • In-situ synthesis method of CsxWO3-SiO2 composite aerogel

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Experimental program
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preparation example Construction

[0038] a Cs x WO 3 -SiO 2 The in-situ synthesis method of composite airgel, said method comprises the following process steps:

[0039] ①Preparation of SiO by sol-gel method 2 -Cs 2 O-WO 3 Composite gel;

[0040] Using water glass and sodium tungstate as raw materials, a certain concentration of H can be obtained through styrene cation exchange resin respectively. 2 SiO 3 and H 2 WO 4 solution; measure a certain amount of H 2 SiO 3 and H 2 WO 4 solution, mix it, add an appropriate amount of cesium salt and a certain amount of organic acid, stir and mix evenly, then heat and age in a water bath at 20-90°C until gelling, and obtain SiO 2 -Cs 2 O-WO 3 Composite gel. Among them, the H 2 SiO 3 The concentration of the solution is 0.15~4.5M, preferably 0.45~2.5M; H 2 WO 4 The concentration of the solution is 0.1-4.0M, preferably 0.2-2.5M; the heating and aging temperature in a water bath is 20-90°C, preferably 30-80°C; the cesium salt can be cesium chloride, cesi...

Embodiment 1

[0053] Embodiment 1 prepares the Cs of Si / W (molar ratio)=5:1 x WO 3 -SiO 2 Composite airgel:

[0054] ① SiO 2 -Cs 2 O-WO 3 Preparation of composite gel;

[0055] Measure 9mL of industrial water glass, mix it evenly with 36mL of deionized water, and use strong acidic styrene cation exchange resin for ion exchange to obtain H 2 SiO 3 solution; weigh 1.55g Na 2 WO 4 2H 2 O, added to 9.4mL deionized water, after dissolving evenly, carry out ion exchange with strongly acidic styrene cation exchange resin to obtain H 2 WO 4 solution; measure 20 mL of H 2 SiO 3 solution, under stirring conditions, sequentially add 9.36mL of H 2 WO 4 solution, 0.846g of Cs 2 SO 4 and 5.51g of citric acid, stirred for 2 hours, and mixed thoroughly to obtain a mixed sol, and then aged the mixed sol in a water bath at 65°C until it gelled, and obtained SiO 2 -Cs 2 O-WO 3 Composite gel.

[0056] ② Preparation of Cs x WO 3 -SiO 2 Composite gel;

[0057] Measure 70mL deionized wate...

Embodiment 2

[0061] Embodiment 2 prepares the Cs of Si / W (molar ratio)=7:1 x WO 3 -SiO 2 Airgel composite particles;

[0062] ① SiO 2 -Cs 2 O-WO 3 Preparation of composite gel;

[0063] Measure 9mL of industrial water glass, mix it evenly with 36mL of deionized water, and perform ion exchange with strongly acidic styrene cation exchange resin to obtain H 2 SiO 3 solution; weigh 1.20gNa 2 WO 4 2H 2 O, added to 7.3mL deionized water, dissolved evenly, ion-exchanged with strong acidic styrene cation exchange resin to obtain H 2 WO 4 solution; measure 20mLH 2 SiO 3 Solution, under stirring condition, add 6.69mLH 2 WO 4 Solution, 0.545gCs 2 CO 3 and 3.671g of tartaric acid, stirred for 2 hours to make it fully mixed, aged in a water bath at 65°C until it gelled, and obtained SiO 2 -Cs 2 O-WO 3 Composite gel.

[0064] ② Preparation of Cs x WO 3 -SiO 2 gel,

[0065] Measure 70ml deionized water, add 4.50g tartaric acid and 0.273g Cs under stirring condition 2 CO 3 , aft...

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Abstract

The invention relates to an in-situ synthesis method of CsxWO3-SiO2 composite aerogel, and belongs to the technical field of thermal insulation and environmental purification materials. The in-situ synthesis method of the CsxWO3-SiO2 composite aerogel is characterized by comprising the following process steps: (1) preparing SiO2-CS2O-WO3 composite gel by adopting a sol-gel process; (2) preparing CsxWO3-SiO2 composite gel through a hydrothermal reaction or a solvothermal reaction; (3) carrying out surface modification treatment on the CsxWO3-SiO2 composite gel; and (4) carrying out normal-pressure drying on the CsxWO3-SiO2 composite gel to obtain the CsxWO3-SiO2 composite aerogel. The obtained composite aerogel has the characteristics of a porous network structure, CsyWO3 crystal grains ofa hexagonal tungsten bronze crystal structure are inlaid in a porous network, the strong absorption property of CsxWO3 particles on near-infrared light can be reflected, and meanwhile the composite aerogel has the characteristics of low heat conductivity coefficient and high adsorbability of SiO2 aerogel.

Description

technical field [0001] The present invention relates to a kind of Cs x WO 3 -SiO 2 The invention relates to an in-situ synthesis method of composite airgel, which belongs to the technical field of thermal insulation and environmental purification materials. Background technique [0002] In recent years, as the society pays attention to green issues such as environmental protection, energy saving and emission reduction, the search for environmental purification materials and thermal insulation materials with high efficiency, stable chemical properties, low economic cost, non-toxic and pollution-free has received more and more attention. . Cesium Tungsten Bronze Cs x WO 3 Due to the localized surface plasmon resonance effect (LSPR) and polaron effects generated by the high carrier concentration inside the structure, the particles exhibit extremely high visible light transmittance and high absorption in the near-infrared band, and have excellent Transparent heat-shielding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 刘敬肖史非陈彬宋昕
Owner DALIAN POLYTECHNIC UNIVERSITY
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