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Phase-transfer preparation method of graphene-based composite aerogel

A composite aerogel, graphene-based technology, applied in the field of nanoporous materials, can solve the problems of difficulty in obtaining nanomaterials with uniform latitude and size, difficult to achieve, and difficult to give full play to the characteristics and advantages of low-dimensional nanomaterials. For mass production, dimensional uniformity, good mechanical properties

Active Publication Date: 2015-03-11
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

The in-situ growth method is to grow the low-dimensional nanomaterials in situ on the graphene sheet through the high-temperature process of the precursor mixture of graphene and low-dimensional nanomaterials. Although this method is relatively simple, it is difficult to realize the The size control of low-dimensional nanomaterials in composite aerogels makes it difficult to obtain nanomaterials with uniform latitude and uniform size; the mechanical mixing method can well control the uniformity of latitude and size of guest nanomaterials, but the guest nanomaterials used must Stabilized by a certain surfactant to inhibit its agglomeration, the graphene-based composite nano-aerogels obtained by this method have residual surfactants, and it is difficult to give full play to the characteristics and advantages of low-dimensional nanomaterials

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preparation example Construction

[0021] Further, a kind of phase transfer preparation method of graphene-based composite aerogel provided by the present invention comprises:

[0022] The graphene oxide solution that can exist stably for more than 1 day and the low-dimensional nanomaterial dispersion liquid that can exist stably for more than 1 day are evenly mixed, and a stable dispersion liquid of graphene and low-dimensional nanomaterials is obtained through a phase transfer process;

[0023] performing hydrothermal treatment on the stable dispersion of the graphene and the low-dimensional nanomaterial to obtain a graphene-based composite hydrogel;

[0024] And, drying the obtained graphene-based composite hydrogel to obtain the graphene-based composite aerogel.

[0025] Further, the phase transfer preparation method of the graphene-based composite aerogel includes: dispersing graphene oxide in an alkaline or neutral aqueous solution to form the graphene oxide dispersion.

[0026] Further, the phase transf...

Embodiment 1

[0059] Example 1: The graphene oxide dispersion liquid is configured into a solution of 8 mg / mL, stirred for 20 minutes, and ultrasonicated for 30 minutes to obtain a uniformly dispersed graphene oxide solution, which is 10 mL of the solution; the polyvinylpyrrolidone solution of 4 mg / mL polypyrrole nanoparticles, wherein The concentration of polyvinylpyrrolidone is 5mg / mL, and 10mL of this solution is added to the above-mentioned graphene oxide solution, stirred for 30 minutes, and then ultrasonicated for 15 minutes to obtain a uniform mixed solution of graphene oxide-polypyrrole nanoparticles; The dispersion liquid of graphene oxide and polypyrrole nanoparticles mixed uniformly is phase transferred (centrifugal washing 10 times, the centrifugal speed is 10000 rpm), and the dispersion liquid of graphene oxide-polypyrrole nanoparticles after phase transfer is transferred. In a polytetrafluoroethylene reactor, hydrothermal treatment is performed to obtain a graphene-polypyrrol...

Embodiment 2

[0062] Example 2: The graphene oxide dispersion was configured into a solution of 8 mg / mL, stirred for 20 minutes, and ultrasonicated for 30 minutes to obtain a uniformly dispersed graphene oxide solution, which was 10 mL; the polyvinylpyrrolidone solution of 4 mg / mL silver nanowires, wherein the polyvinyl pyrrolidone solution was obtained. The concentration of vinylpyrrolidone is 5mg / mL, 10mL of this solution is added to the above graphene oxide solution, stirred for 30 minutes, and then ultrasonicated for 15 minutes to obtain a uniform mixture of graphene oxide-silver nanowires; The uniform dispersion of graphene oxide and silver nanowires is phase-transferred (centrifuged for 10 times, and the centrifugal speed is 10,000 rpm), and the graphene oxide-silver nanowire dispersion that has been phase-transferred is transferred to polytetrafluoroethylene. In an ethylene reactor, hydrothermal treatment is performed to obtain a graphene-silver nanowire composite hydrogel, and the ...

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Abstract

The invention discloses a phase-transfer preparation method of graphene-based composite aerogel. The phase-transfer preparation method comprises the following steps of dispersing graphene oxide in an alkaline or neutral aqueous solution to obtain a stable graphene oxide dispersion liquid, dispersing a low-dimensional nanomaterial in a surfactant-containing aqueous solution to obtain a stable low-dimensional nanomaterial dispersion liquid, mixing the graphene oxide dispersion liquid and the low-dimensional nanomaterial dispersion liquid to obtain a uniform mixed solution, carrying out phase-transferring to obtain a stable graphene-low dimensional nanomaterial dispersion liquid, carrying out hydro-thermal treatment to obtain the graphene-based composite aerogel, and carrying out drying treatment on the graphene-based composite aerogel to obtain a desired product. The phase-transfer preparation method has the advantages of simple and controllable processes, environmental friendliness, low cost and large-scale production feasibility. The graphene-based composite aerogel has a novel structure and good mechanical and electrical properties and can be used as an electrode material such as a supercapacitor electrode material or an organic fuel adsorbent.

Description

technical field [0001] The invention relates to a graphene-based airgel, in particular to a preparation method of a graphene-based composite airgel, and belongs to the technical field of nanoporous materials. Background technique [0002] At present, the research on graphene-based composite airgel materials has attracted much attention. Compared with pure graphene aerogels, graphene-based composite airgel materials not only have the characteristics of high conductivity, high specific surface area, and low density of graphene aerogels, but on the other hand, graphene-based composite airgel The glue material also shows the performance of the guest material. Graphene can be combined with zero-dimensional nanoparticles, one-dimensional nanowires, and two-dimensional nanosheets to form graphene-based composite airgel materials. The types of these guest materials involve Materials such as metals, metal oxides, inorganic substances, and polymers. The current methods for preparing...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 张学同孙瑞
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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