High transmittance nano-porous aerogel material and preparation method thereof

A high-transmittance, nano-porous technology, applied in the direction of silica, bulk chemical production, silicon oxide, etc., can solve the influence of physical properties and microstructure by heat treatment process, which has not been reported in the literature and scientific research problems have not been It can completely solve problems such as holes and achieve the effect of avoiding hole collapse and network structure damage, strong hardness and high transparency

Inactive Publication Date: 2014-04-23
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies provide important references in the preparation of high-performance silica airgel, but the preparation of high-performance and crack-free airgel blocks has not been completely solved as a scientific research problem, and the physical properties and microstructure of the material are affected The influence of the heat treatment process has not been reported in the literature so far

Method used

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  • High transmittance nano-porous aerogel material and preparation method thereof
  • High transmittance nano-porous aerogel material and preparation method thereof
  • High transmittance nano-porous aerogel material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The first step is to use methyl silicate, methanol, insufficient water and appropriate amount of hydrochloric acid according to the molar ratio of 1: 2.4: 1.5: 10 -5 mix. The mixed solution was refluxed at 85°C for 20 hours to achieve full mixing and increase the hydrolysis rate, and then distilled at 95°C for 4 hours to remove the methanol generated by the reaction to obtain partially hydrolyzed and partially polycondensed silica sol (CS), colloidal particles smaller in size;

[0028] The second step reaction is to mix CS with acetonitrile, water and ammonia water in a volume ratio of 1:50:2.5:0.06. SiO is obtained after full hydrolysis 2 Sol, and then pour the sol into the mold, after about 20 minutes, the polycondensation reaction forms a uniform and transparent SiO 2 gel. The wet gel was covered with a small amount of acetonitrile and aged for 1 day, and then replaced with acetonitrile three times, each time for 12 hours.

[0029] SiO 2 Put the wet gel into th...

Embodiment 2

[0032] The first step is to use methyl silicate, methanol, insufficient water and appropriate amount of hydrochloric acid according to the molar ratio of 1: 2.2: 1.3: 10 -5 mix. The mixed solution was refluxed at 85°C for 20 hours to achieve full mixing and increase the hydrolysis rate, and then distilled at 95°C for 4 hours to remove the methanol generated by the reaction to obtain partially hydrolyzed and partially polycondensed silica sol (CS), colloidal particles smaller in size;

[0033] The second step reaction is to mix CS with acetonitrile, water and ammonia water in a volume ratio of 1:40:2.5:0.05. SiO is obtained after full hydrolysis 2 Sol, and then pour the sol into the mold, after about 20 minutes, the polycondensation reaction forms a uniform and transparent SiO 2 gel. The wet gel was covered with a small amount of acetonitrile and aged for 1 day, and then replaced with acetonitrile three times, each time for 12 hours.

[0034] SiO 2 Put the wet gel into th...

Embodiment 3

[0037]In the first step, the molar ratio of methyl silicate, methanol, insufficient water and appropriate amount of hydrochloric acid is 1: 2.8: 1.4: 4×10 -5 mix. The mixed solution was refluxed at 85°C for 20 hours to achieve full mixing and increase the hydrolysis rate, and then distilled at 95°C for 4 hours to remove the methanol generated by the reaction to obtain partially hydrolyzed and partially polycondensed silica sol (CS), colloidal particles smaller in size;

[0038] The second step reaction is to mix CS with acetonitrile, water and ammonia water in a volume ratio of 1:35:2.5:0.045. SiO is obtained after full hydrolysis 2 Sol, and then pour the sol into the mold, after about 20 minutes, the polycondensation reaction forms a uniform and transparent SiO 2 gel. The wet gel was covered with a small amount of acetonitrile and aged for 1 day, and then replaced with acetonitrile three times, each time for 12 hours.

[0039] SiO 2 Put the wet gel into the supercritica...

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Abstract

The invention relates to a high transmittance nano-porous aerogel material and a preparation method thereof. A SiO2 sol is prepared by adopting a two-step sol-gel method; through ageing and solvent replacement and by adopting an acetonitrile supercritical drying process, namely, by creatively introducing acetonitrile as a solvent in the supercritical drying process, a blocky aerogel which is good in transparency, good in forming property and easy to process is obtained. The SiO2 aerogel is a typical mesoporous material, and has the characteristics of extremely high optical transmittance (83.4 percent, 550nm), extremely low heat conductivity (0.065W/(mK)), and the like. The SiO2 aerogel prepared by adopting the synthesis method has a special nano porous structure and excellent physical performance (such as optical); the important application value and the application potential of the SiO2 aerogel in the fields of photoelectric devices, gas sensors, aerospace high-speed particle capturing, electrochemical energy storage devices and heat insulation are greatly promoted.

Description

technical field [0001] The invention belongs to the technical field of preparation of airgel materials, and relates to a nanoporous SiO with high transmittance 2 Preparation method of airgel material. Background technique [0002] Nanoporous materials are emerging material systems developed from the middle of the last century, and are the focus of material science research. They have a nanoporous network structure with adjustable pore size, high specific surface area and porosity, and are widely used in thermal insulation, catalysis, adsorption and separation, nanoassembly and biomedicine. [0003] As a nanoporous material with integrated structure and function, Aerogel is currently the lightest solid in the world. Airgel is a lightweight nanoporous solid material with high permeability cylindrical multi-branched nanoporous three-dimensional network structure and continuous nanoporous structure, and high dispersion characteristics filled with gaseous dispersion medium in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/16
CPCY02P20/54
Inventor 刘光武曾琦琪何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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