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a cs x the w 3 -sio 2 In Situ Synthesis of Composite Airgel

A composite aerogel and composite gel technology, which is applied in the field of in-situ synthesis of CsxWO3-SiO2 composite aerogel, can solve the problems of affecting performance and the uniformity of composite aerogel, and achieves improved pore volume, good infrared Absorptive capacity, high adsorption effect

Active Publication Date: 2022-02-25
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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  • a cs <sub>x</sub> the w <sub>3</sub> -sio <sub>2</sub> In Situ Synthesis of Composite Airgel
  • a cs <sub>x</sub> the w <sub>3</sub> -sio <sub>2</sub> In Situ Synthesis of Composite Airgel
  • a cs <sub>x</sub> the w <sub>3</sub> -sio <sub>2</sub> In Situ Synthesis of Composite Airgel

Examples

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] Example 1 Preparation of Cs with Si / W (molar ratio)=5:1 x WO 3 -SiO 2 Composite Aerogel:

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

[0055] Measure 9 mL of industrial water glass, mix it with 36 mL of deionized water, and perform ion exchange with strongly acidic styrene cation exchange resin to obtain H 2 SiO 3 solution; weigh 1.55g Na 2 WO 4 ·2H 2 O, added to 9.4 mL of deionized water, and after uniform dissolution, ion exchange was carried out 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, add 9.36 mL of H 2 WO 4 Solution, 0.846g of Cs 2 SO 4 and 5.51 g of citric acid, stirred for 2 hours to make it fully mixed to obtain a mixed sol, and then the mixed sol was aged in a water bath at 65 °C until it gelled to obtain SiO 2 -Cs 2 O-WO 3 composite gel.

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

[0057] Measure 70mL of deionized wa...

Embodiment 2

[0061] Example 2 Preparation of Cs with Si / W (molar ratio)=7:1 x WO 3 -SiO 2 Aerogel composite particles;

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

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

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

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

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Abstract

The present invention relates to a kind of Cs x WO 3 ‑SiO2 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. a Cs x WO 3 ‑SiO2 2 The in-situ synthesis method of composite airgel is characterized in that: the method comprises the following process steps: 1. SiO is prepared by sol-gel method 2 -Cs 2 O‑WO 3 Composite gel; ② Preparation of Cs by hydrothermal or solvothermal reaction x WO 3 ‑SiO2 2 Composite gel; ③ for Cs x WO 3 ‑SiO2 2 surface modification of the composite gel; ④ for Cs x WO 3 ‑SiO2 2 The composite gel was dried under normal pressure to obtain Cs x WO 3 ‑SiO2 2 Composite airgel. The composite airgel obtained in the present invention has the characteristics of a porous network structure, and the Cs of the hexagonal tungsten bronze crystal structure is embedded in the porous network. y WO 3 Grains, not only can reflect the Cs x WO 3 Particles have strong absorption properties for near-infrared light, and have SiO 2 The low thermal conductivity and high adsorption characteristics of airgel.

Description

technical field [0001] The present invention relates to a Cs x WO 3 -SiO 2 The in-situ synthesis method of composite aerogel belongs to the technical field of thermal insulation and environmental purification materials. Background technique [0002] In recent years, with the society's attention to green issues such as environmental protection, energy conservation and emission reduction, the search for high-efficiency, stable chemical properties, low economic cost, non-toxic and non-polluting environmental purification materials and thermal insulation materials have received more and more extensive attention. . Cesium tungsten bronze Cs x WO 3 Due to the localized surface plasmon resonance (LSPR) and polaron effect generated by the high carrier concentration inside the structure, the particle exhibits extremely high visible light transmittance and high absorption in the near-infrared band, and has excellent Transparent heat shielding and full-spectrum photocatalytic fun...

Claims

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Application Information

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Patent Type & Authority Patents(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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