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Method for preparing carbon gas gel

A carbon aerogel and aerogel technology, which is applied in the field of preparation technology of atmospheric drying method, can solve the problems of carbon particle size and porosity damage, nano-particle structure collapse, etc., and achieves shortened preparation time, simple process and equipment, The effect of high porosity

Inactive Publication Date: 2006-10-25
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the past, the reason why people used supercritical drying technology instead of normal pressure drying technology to prepare organic airgel precursors was that improper normal pressure drying would lead to the collapse of the nanoparticle structure of the gel, and the size and size of carbon particles Porosity is destroyed

Method used

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  • Method for preparing carbon gas gel
  • Method for preparing carbon gas gel
  • Method for preparing carbon gas gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: according to R / F=0.5, R / C=100 (C is hexadecyltrimethylammonium bromide), RF%=40wt%, with 1 gram of resorcinol, 1.26 milliliters of aqueous formaldehyde ( 37~40wt%, the formula is calculated with 38.5wt% in this paper), 0.0331 grams of cetyltrimethylammonium bromide and 1.46 milliliters of distilled water are mixed and stirred evenly, then poured into an ampoule bottle and sealed, reacted at 85°C The hydrogel was obtained in 5 days; then dried naturally in the air for half a day, dried with an infrared lamp (drying position at about 60°C) for 5 hours, and then placed in an oven (110°C) for final drying and dehydration for 5 hours to obtain an organic aerosol glue. The measured density of the organic airgel is 0.452g cm -3 , with a theoretical density of 0.449g cm -3 Very close; BET specific surface area is 282m 2 g -1 , mesopore volume 1.1cm 3 g -1 , The mesopore diameter is about 18nm.

Embodiment 2

[0020] Embodiment 2: According to R / F=0.5, R / C=200 (C is sodium dodecylsulfonate), RF%=40wt%, with 1 gram of resorcinol, 1.26 milliliters of formaldehyde aqueous solution, 0.0124 gram of ten Sodium dialkylsulfonate and 1.46 milliliters of distilled water were mixed and stirred evenly, then poured into an ampoule bottle and sealed, and reacted at 85° C. for 1 day to obtain a hydrogel; then naturally dried in air for 1 day, and dried by an infrared lamp ( The drying position is about 60°C) for 5 hours, and then placed in an oven (110°C) for final drying and dehydration for 5 hours to obtain an organic airgel. The measured density of the organic airgel is 0.452g cm -3 , with a theoretical density of 0.448g cm -3 very close. The BET specific surface area is 227m 2 g -1 , mesopore volume 0.52cm 3 g -1 , The average pore size is 10.6nm.

Embodiment 3

[0021] Embodiment 3: According to R / F=0.5, R / C=100 (C is tetrabutylammonium bromide), RF%=40wt%, with 1 gram of resorcinol, 1.26 milliliters of formaldehyde aqueous solution, 0.0293 gram of tetrabutylammonium Ammonium bromide and 1.46 ml of distilled water were mixed and stirred evenly, then poured into an ampoule bottle and sealed, reacted at 85°C for 5 days to obtain a hydrogel; then dried naturally in the air for half a day, and dried with an infrared lamp (drying position about 60°C) for 5 hours, and then placed in an oven (110°C) for final drying and dehydration for 5 hours to obtain an organic airgel. The measured density of organic airgel is 0.559g cm -3 , with a theoretical density of 0.448g cm 3 closer.

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Abstract

The invention relates to a normal-pressure drying preparation method of organic airgel and carbon airgel thereof. This method takes resorcinol and formaldehyde as reaction monomer, organic surfactant (for example, hexadecyltrimethylammonium bromide, sodium laurylsulfonate) as emulsifier and catalyst, water is solvent, The hydrogel is cured by heating; then, the organic aerogel can be obtained by directly drying naturally or by heating. Moreover, the carbonized aerogel with high specific surface area can be obtained by carbonizing the organic aerogel in an inert atmosphere. The preparation process of the organic aerogel and the carbon aerogel proposed by the invention is simple and fast, requires low equipment and is environmentally friendly, and is expected to realize the industrialized production of the carbon aerogel.

Description

technical field [0001] The invention relates to a low-density massive organic airgel and a normal-pressure drying method preparation process for the carbon airgel thereof. technical background [0002] Due to its unique nanoparticle network structure, abundant mesopores, large specific surface area, and good electrical conductivity, carbon aerogels are being developed and used in the manufacture of supercapacitor electrodes, catalysts and catalyst carriers, gas filter materials, and drug carriers. , infrared absorbing materials and acoustic impedance coupling materials have good market prospects. Therefore, at present, research on the preparation of carbon aerogels at home and abroad continues to attract people's attention. Since Pekala first prepared carbon aerogels in the 1980s, many preparation, structure and application results have been published. [0003] However, the current problems in the preparation of carbon aerogels seriously restrict its practical application ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 符若文吴丁财
Owner SUN YAT SEN UNIV
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