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A kind of preparation method of ultra-low density silica nanotube airgel material

A silica and aerogel technology, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the difficulty of silica aerogel process, the fragility of silica aerogel, the connection Fragility and other issues, to achieve the effect of low production cost, low apparent density, and short production cycle

Active Publication Date: 2021-04-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the traditional silica airgel is formed by a complex sol-gel process, the joints between the skeleton particles are relatively fragile, so the mechanical properties are extremely poor; the entire process takes a long time, resulting in high cost; fabrication Low-density silica airgel process is difficult and flat Taste low rate
These defects make silica aerogels extremely fragile during the actual production and application process, and its high cost is not conducive to commercial applications

Method used

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  • A kind of preparation method of ultra-low density silica nanotube airgel material
  • A kind of preparation method of ultra-low density silica nanotube airgel material
  • A kind of preparation method of ultra-low density silica nanotube airgel material

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Embodiment 1

[0019] Embodiment 1: Preparation of low-density silica nanotube airgel

[0020] Put 0.30g of bulk carbon aerogel in a vacuum desiccator, put two small beakers in the vacuum desiccator, add 1mL tetraethyl orthosilicate and 1mL ammonia water respectively, seal and evacuate. Put the vacuum dryer into an incubator at 160°C and keep it for 6 hours, so that the carbon aerogel can fully absorb tetraethyl orthosilicate and ammonia water, and fully dehydrate the tetraethyl orthosilicate. A thin layer of silica is formed on the carbon airgel skeleton. Take the desiccator out of the incubator and cool it down to room temperature, take out the carbon aerogel with silica deposited therein, and place it in a 90°C incubator to remove the unreacted solvent and moisture adsorbed by the carbon aerogel. The resulting composite material was placed in a tube furnace and heated to 600 °C to remove the carbon airgel skeleton, thereby obtaining bulk silica airgel with a nanotube-like microstructure....

Embodiment 2

[0024] Embodiment 2: Preparation of low-density silica nanotube airgel

[0025] Put 0.30g of bulk carbon aerogel in a vacuum desiccator, put two small beakers in the vacuum desiccator, add 1mL tetraethyl orthosilicate and ammonia water, seal and vacuumize. Put the desiccator into an incubator at 160°C and keep it for 6 hours, so that the carbon aerogel can fully absorb tetraethyl orthosilicate and ammonia water, and fully dehydrate the tetraethyl orthosilicate. A thin layer of silica is formed on the airgel skeleton. Take the desiccator out of the incubator and cool it down to room temperature, take out the carbon aerogel with silica deposited therein, and place it in a 90°C incubator to remove the unreacted solvent and moisture adsorbed by the carbon aerogel. After repeating the above process 4 times, the obtained composite material was placed in a tube furnace and heated to 600 °C to remove the carbon airgel skeleton, thereby obtaining bulk silica airgel with a nanotube-lik...

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Abstract

The invention relates to a preparation method of an ultra-low density silicon dioxide nanotube airgel material. The present invention uses bulk carbon aerogel as a template, tetraethyl orthosilicate as a raw material, and under the catalysis of ammonia water, a thin layer of silicon dioxide is deposited on the dendritic carbon aerogel skeleton by chemical vapor deposition, and then The carbon airgel template was removed by high-temperature oxidation, and a massive ultra-low-density silica nanotube airgel material was prepared. The performance of the silica airgel obtained by the invention is more excellent, and the yield is high. The invention has the characteristics of simple reaction process, low overall cost, high yield of low density and the like. The carbon airgel framework has a good adsorption and support effect on the silicon oxide thin layer, which can reduce the collapse of the framework and the shrinkage of the structure during high-temperature sintering to a certain extent, and can also maintain the nanoporous structure of the airgel. The density of the material of the invention is as low as 25.3, the thermal conductivity is 0.030-0.033, the compression modulus reaches 1.996Mpa, and has good mechanical processability.

Description

technical field [0001] The invention belongs to the technical field of airgel material preparation, and in particular relates to a preparation method of an ultra-low density silicon dioxide nanotube airgel material. Background technique [0002] Airgel is a multifunctional material with a three-dimensional nano-pore structure. Due to its excellent performance, it is widely used in many fields. However, because the traditional silica airgel is formed by a complex sol-gel process, the joints between the skeleton particles are relatively fragile, so the mechanical properties are extremely poor; the entire process takes a long time, resulting in high cost; fabrication Low-density silica airgel process is difficult and flat Taste low rate. These defects make silica aerogels extremely fragile during the actual production and application process, and its high cost is not conducive to commercial applications. [0003] Carbon airgel is a three-dimensional network framework materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/16C01B33/159
CPCC01B33/159C01B33/16
Inventor 杜艾汪宏强周斌
Owner TONGJI UNIV