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Construction method of graphene protecting structure

A protective structure and graphene technology, which is applied in the field of building graphene protective structures to improve its mechanical properties, can solve the problems of slag falling and easy peeling, and achieve the effect of improving shear resistance, improving mechanical properties, and meeting application requirements

Inactive Publication Date: 2015-03-11
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these compressible graphene sponges can withstand thousands of compression tests in the axial direction, these sponges are prone to peeling and slag when they are subjected to shear forces in other directions, such as accidentally scratching

Method used

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  • Construction method of graphene protecting structure
  • Construction method of graphene protecting structure
  • Construction method of graphene protecting structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step, get the graphene oxide deionized water dispersion liquid 200ml of 10mg / ml, the ceramic foam (as figure 1 ) is completely immersed in it;

[0020] In the second step, after soaking for a period of time, put the ceramic foam into a freeze-drying box for freeze-drying;

[0021] The third step is to put the obtained freeze-dried ceramic foam into a container containing hydrazine hydrate, seal it well, heat it to 95°C and maintain it for 24 hours, and use hydrazine vapor to reduce it, and finally get a graphene sponge filling Rigid ceramic foams such as figure 2 shown. image 3 The cross-sectional structure of the graphene sponge can be seen more clearly: the skeleton structure of the ceramic foam is wrapped around the outside of the graphene sponge, which plays a very good protective role.

Embodiment 2

[0023] The control method is basically the same as in Example 1, except that the concentration of graphene oxide is adjusted to 0.5 mg / ml, and a ceramic foam with a pore size of 100 microns is used;

Embodiment 3

[0025] The control method is basically the same as in Example 1, except that the graphene oxide concentration is adjusted to 20 mg / ml, and ceramic foam with a pore size of 5 mm is used;

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Abstract

The invention discloses a construction method of a graphene protecting structure, namely a preparation method of a graphene sponge / rigid foam composite structure. The method comprises the following specific steps: entirely soaking hydrophilic rigid foam into a dispersion liquid of oxidized graphene, then carrying out freeze drying to the product, and at last utilizing hydrazine steam to reduce the product. With application of the method, the graphene is added with the rigid foam skeleton or external skeleton to protect the graphene sponge. The construction method disclosed by the invention is to build the protecting structure for graphene for the first time, so as to retain the original excellent properties such as the ultrahigh specific surface area of the graphene sponge, greatly improve the mechanical properties at the same time, and obviously improve the shear resistance; meanwhile, the size of the graphene can be flexibly controlled through change of pore size of the rigid foam, so that the various application requirements are met.

Description

technical field [0001] The invention relates to a method for constructing a graphene protective structure so as to improve its mechanical properties. Background technique [0002] Since graphene was first prepared in 2004, it has attracted widespread attention due to its excellent electrical, mechanical, thermal and magnetic properties (Nature, 2007, 6, 183; Nature, 2012, 490, 192). Recent studies have found that functional devices based on 3D graphene show more outstanding performance in the fields of energy storage, environment, sensing and biological analysis. Therefore, the preparation of new 3D graphene materials has become a current research focus. The current preparation methods of 3D graphene materials mainly include solution self-assembly, interfacial self-assembly, template-mediated synthesis, etc. (Chem. Rev., 2002, 102, 4243 ; ACS Nano, 2010, 4, 4324; Nat. Mater., 2011, 10, 424). However, flake graphene is bonded by intermolecular force, which itself is weak, s...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 孙立涛毕恒昌万树
Owner SOUTHEAST UNIV
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