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A method for constructing graphene surface wrinkles

A technology of graphene surface and graphene powder, applied in the direction of graphene, coating, nano-carbon, etc., can solve the problems of lack of three-dimensional construction method, cumbersome process, small pre-stretching rate, etc., and achieve good application prospects and folding degree High, good hydrophobic effect

Active Publication Date: 2019-09-10
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although preliminary research results have been achieved in the construction of micro-wrinkles on the graphene surface and their applications, there are still some limitations and deficiencies: on the one hand, the existing work is mainly based on the construction of graphene wrinkles on the surface of a two-dimensional matrix, lacking The real three-dimensional construction method has not been reported in the literature based on the hollow spherical and cylindrical substrate graphene folds; on the other hand, the current construction process of graphene surface folds usually has a small pre-stretching rate, and it is difficult to obtain a highly folded state. Or it is necessary to obtain a highly folded state through multi-step transfer, which is extremely cumbersome
There is no report on the preparation of highly folded graphene folds by one-time three-dimensional shrinkage

Method used

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  • A method for constructing graphene surface wrinkles
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Examples

Experimental program
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Effect test

Embodiment 1

[0035] This embodiment includes the following steps:

[0036] (1) Dispersion liquid configuration: Disperse 200 mg of graphene oxide powder (single layer, sheet size of 4 microns) in 100 ml of deionized water, ultrasonically disperse for 1 hour, and configure graphene oxide with a concentration of 2.0 mg / ml Dispersions;

[0037] (2) Substrate surface treatment: Put the hollow spherical natural rubber substrate (substrate thickness of 200 microns) into absolute ethanol, ultrasonically clean for 30 minutes, and vacuum dry at room temperature for 1 hour;

[0038] The purity of the absolute ethanol is 99% (mass percentage).

[0039] (3) Substrate pre-stretching: fill the hollow spherical rubber polymer substrate treated in step (2) with air, expand it until the hoop pre-stretching strain of the spherical substrate reaches 300%, and fix it;

[0040] (4) Surface coating: Coat the graphene oxide dispersion prepared in step (1) on the surface of the hollow spherical rubber polymer s...

Embodiment 2

[0047] The difference between this example and Example 1 is that in step (1), the graphene is a single layer, the sheet size is 2 microns, and the concentration of graphene oxide is 3.0 mg / ml; in step (2), the rubber component It is butadiene rubber, and the thickness of the substrate is 300 microns; in step (4), a graphene oxide coating with a thickness of 3.0 microns is obtained. All the other parameters are the same as in Example 1.

[0048] The wrinkle folding index of the obtained graphene surface is 5.6, the wrinkle width is 6.3 microns, the wrinkle height is 32.5 microns, and the water contact angle is 110 degrees.

Embodiment 3

[0050] The difference between this example and Example 1 is that in step (1), the graphene has three layers, the sheet size is 20 microns, and the concentration of graphene oxide is 5.0 mg / ml; in step (2), the rubber component It is nitrile rubber, and the thickness of the substrate is 100 microns; in step (4), a graphene oxide coating with a thickness of 3.5 microns is obtained. All the other parameters are the same as in Example 1.

[0051] The wrinkle folding index of the obtained graphene surface is 5.0, the wrinkle width is 6.6 microns, the wrinkle height is 35.5 microns, and the water contact angle is 102 degrees.

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Abstract

The invention discloses a construction method for graphene surface folds. The method comprises the following steps: (1) preparing a graphene oxide dispersion; (2) treating the surface of a substrate; (3) prestretching the substrate; (4) carrying out surface coating; (5) contracting the substrate; and (6) reducing graphene oxide. The graphene surface folds are prepared through one-time three-dimensional contraction, and are high in folding degree, good in hydrophobicity, stretchable and easy to bend, can be used for constructing a solvent response-type deformation brake which is bidirectionally bent, and has a fast response and large curvature deformation, can be used for assembling a strain transducer which is high in sensitivity, low in potential drive and long in service life, and has a good application prospect in the field of wearable intelligent devices.

Description

technical field [0001] The invention belongs to the field of construction of surface micro-nano structures, and in particular relates to a construction method of graphene surface wrinkles. Background technique [0002] The regulation of microstructure based on the surface of polymer matrix is ​​a major research topic in the field of nanoscience, especially the construction and regulation of biomimetic structures on the surface of elastomers. Inspired by the surface microstructure in nature, researchers construct bionic surface folds in the laboratory. In 1998, Bowden et al. obtained the wrinkled structure of the metal film through thermal shrinkage of the substrate, which opened a new chapter in the construction of surface wrinkles in the laboratory (Nature 1998, 393: 146-149). According to the different precursors for constructing surface wrinkles, there are three main strategies for the construction of surface wrinkles: (1) surface wrinkle construction based on film / subst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C01B32/184C08L7/00C08L9/00C08L9/02
Inventor 楚增勇谭银龙蒋振华李公义胡天娇宋嘉李义和王清华
Owner NAT UNIV OF DEFENSE TECH