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Ultra-black carbon-silica core-shell structure aerogel and preparation method thereof

A technology of silica and core-shell structure, applied in the preparation/purification of silica, silicon oxide, carbon, etc., can solve the problems of damage to the circuit system of the instrument, danger, etc., and achieve short process flow, short production cycle, and guaranteed Effect of cladding mass

Inactive Publication Date: 2019-11-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon aerogel, a nanoporous carbon material, has the intrinsic properties of carbon, so it has high electrical conductivity, which makes its application in some fields potentially dangerous, and its high electrical conductivity will destroy The circuit system of the instrument

Method used

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  • Ultra-black carbon-silica core-shell structure aerogel and preparation method thereof
  • Ultra-black carbon-silica core-shell structure aerogel and preparation method thereof
  • Ultra-black carbon-silica core-shell structure aerogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment is an ultra-black carbon-silica core-shell structure airgel, the electrical conductivity of which is adjustable, and its preparation method is:

[0041]Dissolve 3.235g of resorcinol in 91.26mL of deionized water, then add 4.47mL of formaldehyde solution and fully stir; finally add 0.74mL of sodium carbonate aqueous solution with a concentration of 0.05mol / L, and fully stir for 2 hours to obtain resorcinol- Formaldehyde sol. Transfer the obtained resorcinol-formaldehyde sol into a glass bottle and seal it for storage, and store the glass bottle in an incubator at 85°C for 3 days to gel the resorcinol-formaldehyde sol to obtain resorcinol - Formaldehyde wet gel. The obtained wet gel was placed in absolute ethanol for sufficient solvent replacement, and then subjected to supercritical carbon dioxide drying to obtain resorcinol-formaldehyde airgel. The obtained resorcinol-formaldehyde airgel was placed in a tube furnace under the protection of a nitrogen a...

Embodiment 2

[0046] This embodiment is an ultra-black carbon-silica core-shell structure airgel, the electrical conductivity of which is adjustable, and its preparation method is:

[0047] Dissolve 3.235g of resorcinol in 91.26mL of deionized water, then add 4.47mL of formaldehyde solution and fully stir; finally add 0.74mL of sodium carbonate aqueous solution with a concentration of 0.05mol / L, and fully stir for 2 hours to obtain resorcinol- Formaldehyde sol. Transfer the obtained resorcinol-formaldehyde sol into a glass bottle and seal it for storage, and store the glass bottle in an incubator at 85°C for 3 days to gel the resorcinol-formaldehyde sol to obtain resorcinol - Formaldehyde wet gel. The obtained wet gel was placed in absolute ethanol for sufficient solvent replacement, and then subjected to supercritical carbon dioxide drying to obtain resorcinol-formaldehyde airgel. The obtained resorcinol-formaldehyde airgel was placed in a tube furnace under the protection of a nitrogen ...

Embodiment 3

[0050] This embodiment is an ultra-black carbon-silica core-shell structure airgel, the electrical conductivity of which is adjustable, and its preparation method is:

[0051] Dissolve 3.235g of resorcinol in 91.21mL of deionized water, then add 4.47mL of formaldehyde solution and stir thoroughly; finally add 1.18mL of sodium carbonate aqueous solution with a concentration of 0.05mol / L, and fully stir for 2 hours to obtain resorcinol- Formaldehyde sol. Transfer the obtained resorcinol-formaldehyde sol into a glass bottle and seal it for storage, and store the glass bottle in an incubator at 85°C for 3 days to gel the resorcinol-formaldehyde sol to obtain resorcinol - Formaldehyde wet gel. The obtained wet gel was placed in absolute ethanol for sufficient solvent replacement, and then subjected to supercritical carbon dioxide drying to obtain resorcinol-formaldehyde airgel. The obtained resorcinol-formaldehyde airgel was placed in a tube furnace under the protection of a nitr...

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Abstract

The invention relates to an ultra-black carbon-silica core-shell structure aerogel and a preparation method thereof, wherein the core is an ultra-black carbon aerogel, and the surface of the core is coated with silica by using a chemical vapor deposition method to form a shell. The preparation method comprises: preparing a resorcinol-formaldehyde aerogel by using a sol-gel technology, and carryingout high-temperature carbonization treatment on the resorcinol-formaldehyde aerogel to obtain an ultra-black carbon aerogel; and forming a silica shell with a nano-scale thickness on the surface of the ultra-black carbon aerogel by using a chemical deposition method to obtain the ultra-black carbon-silica core-shell structure aerogel. Compared with the aerogel in the prior art, the aerogel of thepresent invention has low electrical conductivity of 0.021 ms / mm, has high light absorption rate, has an average absorption of more than 98.6% at a wave band of 400-2000 nm, and further has advantages of simple reaction process, low overall cost, low density, high yield, adjustable electrical conductivity and the like.

Description

technical field [0001] The invention belongs to the technical field of airgel material preparation, and in particular relates to an ultra-black carbon-silica core-shell structure airgel and a preparation method thereof. Background technique [0002] Airgel is a multifunctional material with a three-dimensional nanoporous structure. It is widely used in many fields due to its excellent properties: high specific surface area, low density, low sound velocity, etc. Among them, carbon airgel is a three-dimensional network skeleton material with good mechanical properties and strong adsorption capacity, and has been used in various fields such as adsorption, electrochemistry, and wave absorption. In addition, carbon airgel is also an ultra-black material induced by subwavelength microstructure. Carbon aerogel is a broad-band strong absorption material, and its absorptivity has no obvious dependence on the incident angle, which makes it have application prospects in the fields of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B33/18B82Y30/00
CPCC01B32/05C01B33/183B82Y30/00C01P2004/80C01P2006/40
Inventor 杜艾汪宏强张晨杨建明周斌
Owner TONGJI UNIV
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