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Manufacturing method of graphene foam

A technology of graphene foam and a manufacturing method is applied in the field of foam materials to achieve the effects of large compressive modulus, simple and feasible method, and convenient control

Active Publication Date: 2013-07-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]The process of controlling the pore structure through directional freeze crystallization has been studied and applied in traditional materials such as porous ceramics (Deville, S., et al.Science 2006, 3121 ,5760; W. L. Li., et al. International Materials Reviews, 2012, 57, 1), but there is no report on graphene foam materials

Method used

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  • Manufacturing method of graphene foam

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A kind of manufacture method of graphene foam, it is characterized in that, this manufacture method comprises the following steps:

[0030] 1) The aqueous dispersion of graphene oxide is reduced by a hydrothermal method, so that the graphene sheet self-assembles to obtain a graphene wet gel block. Pour the water dispersion liquid into the sealed inner cup of the hydrothermal reaction kettle, add ammonia water to adjust the pH value to form a mixed solution with a pH value of 10, raise the temperature to 200°C and keep it warm, and finally the graphene oxide in the mixed solution is reduced and reunited into graphite olefin wet gel block;

[0031] 2) The graphene wet gel block obtained in step 1) is frozen on a metal tray, and the metal tray has a preset freezing temperature of -20° C. After 1 h of freezing, the graphene wet gel block is completely crystallized into gel crystalline solid;

[0032] 3) The gel crystalline solid obtained in step 2) is subjected to vacuum ...

Embodiment 2

[0035] The manufacturing method of the graphene foam is the same as that of Example 1 except that the preset freezing temperature is -196° C. (liquid nitrogen temperature).

[0036] Effect: The obtained graphene foam has an isotropic diffuse cell pore structure, the interlayer spacing is about 15 microns, and the sheet thickness is less than 50 nanometers. figure 1 d with attached figure 2 as shown in b.

Embodiment 3

[0038] Except that the preset freezing temperature is-10°C in the manufacture method of the graphene foam, all the other are the same as in Example 1.

[0039] Effect: as attached figure 1As shown in a, the obtained graphene foam has a lamellar structure parallel to the freezing direction, and the central axis of the cylinder is wrapped in a cabbage structure (that is, a layered cabbage wrapped structure), but the lamellar arrangement has no obvious directionality. Example 1 is more confusing.

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Abstract

The invention provides a manufacturing method of graphene foam. The manufacturing method comprises the following steps of: 1) reducing an aqueous dispersion of graphene oxide through a hydrothermal method, and performing self-assembly on graphene sheets to obtain a graphene wet gel block body; 2) freezing the graphene wet gel block body obtained in the step 1) on a metal tray, wherein the metal tray has preset freezing temperature which is controlled within a range of -196 DEG C to -10 DEG C, and the graphene wet gel block body after freezing is completely crystallized to form a gel crystalline solid; and 3) performing vacuum sublimation and drying on the gel crystalline solid obtained in the step 2). The manufacturing method has the advantages of simple process and capability of regulating and controlling a hole structure of the graphene foam, thus the graphene foam has different properties.

Description

technical field [0001] The invention relates to the field of foam materials, in particular to a method for manufacturing graphene foam. Background technique [0002] Graphene material is a two-dimensional material composed of a single atomic layer of carbon. Since it was discovered in 2004 (Novoselov, K. S. et al. Science 2004, 306, 666), this unique material has been widely used for its various excellent properties. focus on. Thanks to the good mechanical and electrical properties, the three-dimensional macroscopic materials based on two-dimensional graphene materials will have good performance and have a wide range of application prospects. The graphene foam material obtained by the assembly of two-dimensional graphene has a large specific surface area and good thermal and electrical conductivity. This material proved to be an efficient adsorbent for oils and organic solvents (Bi, H. et al. Advanced Functional Materials 2012, 22, 4421), while graphene foams have been us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/184
Inventor 孙立涛周奕龙卜忻阳郭立勇彭富林陈方韬杨庆龄孙佳惟万树
Owner SOUTHEAST UNIV
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