Thin-wall foam carbon material with nanoscale wall thickness and preparation method thereof

A nano-scale, foamed carbon technology, applied in the field of foamed carbon materials and its preparation, can solve the problems of harsh process conditions, thick carbon wall, complicated operation, etc., and achieve the effects of simple operation, time saving, promotion of carbonization, and stable heating effect.

Active Publication Date: 2015-01-28
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the point of view of the preparation methods of foamed carbon materials, there are mainly conventional foaming method, template method, supercritical method and 60 Co ray radiation method, etc., there are problems of complicated operation or harsh process conditions
From the structure of the obtained materials, most of the foamed carbon materials obtained at present are porous and reticular, and the carbon walls are generally thick (micron scale), which is not conducive to the full exposure and effective utilization of the carbon skeleton.

Method used

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  • Thin-wall foam carbon material with nanoscale wall thickness and preparation method thereof
  • Thin-wall foam carbon material with nanoscale wall thickness and preparation method thereof
  • Thin-wall foam carbon material with nanoscale wall thickness and preparation method thereof

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preparation example Construction

[0039] The preparation method of the thin-walled foamed carbon material of above-mentioned nanoscale wall thickness, comprises the steps:

[0040] (1) Dispersing cornstarch in an acidic aqueous solution and dipping it to obtain a cornstarch slurry; the slurry uses the pitting hydrolysis of the cornstarch by the acid solution to make holes in the cornstarch granules;

[0041] (2) Suction filter the corn starch slurry to obtain a filter cake;

[0042] (3), drying filter cake;

[0043](4) Put the dried filter cake in a non-metallic heat-resistant closed container equipped with a microwave absorber. The total volume of the starch granules should be much smaller than the volume of the container, and then fill it with an inert protective gas;

[0044] (5) Put the container in the microwave field, and use the microwave to heat the starch granules in the container rapidly, so that a large amount of decomposition gas is generated inside the starch granule in a short time, and the deco...

Embodiment 1

[0056] Firstly, 5 g of corn starch was dispersed in 50 mL of an aqueous solution containing 1 mol / L sulfuric acid and 1 mol / L phosphoric acid, soaked for 3 h and then suction filtered, and then the filter cake was dried in an oven at 100 °C for 3 h. Weigh 2 g of the above-mentioned dried starch into a quartz crucible with an inner diameter of 2.5 cm and a height of 5 cm, and then place the quartz crucible in another quartz crucible with an inner diameter of 5.0 cm and a height of 8.0 cm that is equipped with a microwave absorber of ferric oxide In, and make ferric oxide evenly filled between two quartz crucibles. Fill the crucible with nitrogen protection, cover the crucible lid, and then heat it in a Galanz microwave oven WG700TL2011-K6 at high heat for 2 min and then cool to room temperature. The obtained product was washed with distilled water until neutral, and finally dried in an oven at 100 °C for 3 h to obtain a thin-walled carbon foam material with nanometer wall thick...

Embodiment 2

[0059] First, 5 g of corn starch was dispersed in 50 mL of an aqueous solution containing 1 mol / L sulfuric acid, 1 mol / L phosphoric acid, and 0.4 mol / L zinc chloride, soaked for 3 h, and then suction-filtered, and then the filter cake was placed in an oven at 100 °C. Dry for 3 h. Weigh 2 g of the above-mentioned dried starch into a quartz crucible with an inner diameter of 2.5 cm and a height of 5 cm, and then place the quartz crucible in another quartz crucible with an inner diameter of 5.0 cm and a height of 8.0 cm that is equipped with a microwave absorber of ferric oxide In, and make ferric oxide evenly filled between two quartz crucibles. Fill the crucible with nitrogen protection, cover the crucible lid, and then heat it in a Galanz microwave oven WG700TL2011-K6 at high heat for 2 min and then cool to room temperature. The obtained product was soaked in 1 mol / L sulfuric acid for 1 h, filtered and then washed with distilled water until neutral, and the final product was ...

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Abstract

The invention relates to a foam carbon material and a preparation technology thereof, and particularly relates to a thin-wall foam carbon material with nanoscale wall thickness and a rapid preparation method thereof. Through adoption of corrosive pitting hydrolysis and dehydration of acid liquor on corn starch, the starch is rapidly foamed and carbonized due to microwave, so that the thin-wall foam carbon material with nanoscale wall thickness is formed. The carbon yield can reach 25-35%. The thin-wall foam carbon material has a three-dimensional net structure, the meshes are connected through thin-wall carbon layers, the carbon wall area of one mesh is 10-50mu m, the carbon wall is 25nm thick, and the carbon wall comprises hydroxy, carbonyl and epoxy active groups. The material contains micropores and mesopores. The mesopores are mainly in narrow distribution in 2-9nm, and the carbon wall of the activated thin-wall foam carbon material is overlapped by porous carbon plates. The thin-wall foam carbon material is beneficial for fully exposing and effectively using a carbon skeleton, and can be used as an electrode material or a catalyst carrier.

Description

technical field [0001] The invention relates to a foamed carbon material and a preparation technology thereof, in particular to a thin-walled foamed carbon material with a nanoscale wall thickness and a rapid preparation method thereof. Background technique [0002] Foam carbon is a new type of carbonaceous material, which has the characteristics of low density, high temperature resistance, corrosion resistance, and good heat insulation. In addition, it also has properties such as conductivity and wave absorption. These excellent properties make foam carbon in heat exchangers and catalyst carriers. , electronic devices and aerospace and many other civil and military fields have broad application prospects. According to the degree of graphitization, carbon foam can be divided into non-graphitizable carbon foam and graphitized carbon foam; according to the different pore structure, it can be divided into porous carbon foam and network foam carbon. At present, the raw material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 雷洪
Owner SOUTHWEAT UNIV OF SCI & TECH
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