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A kind of self-crimping preparation method of hollow graphene fiber and its application

A graphene fiber, self-crimping technology, applied in the direction of hollow filament manufacturing, fiber processing, fiber chemical characteristics, etc., can solve the problems of graphene fiber mechanical strength deterioration, failure to achieve efficiency and continuity, etc., to promote external shearing Cutting force, high-efficiency preparation, and the effect of improving production efficiency

Active Publication Date: 2022-07-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For dry spinning, due to the volatilization of the solvent from the graphene oxide dispersion slurry, a large number of microporous structures are left, resulting in poor mechanical strength of the prepared graphene fibers
Shrinkage, hydrothermal, and templating methods have successfully produced porous and hollow fibers with good properties, but they are still far from meeting the requirements of efficiency and continuity.

Method used

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  • A kind of self-crimping preparation method of hollow graphene fiber and its application
  • A kind of self-crimping preparation method of hollow graphene fiber and its application
  • A kind of self-crimping preparation method of hollow graphene fiber and its application

Examples

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Effect test

Embodiment 1

[0027] A kind of self-crimping preparation method of hollow graphene fiber, the specific operation steps are as follows:

[0028] (1) Weigh 20g of commercial graphene oxide slurry with a mass concentration of 0.94% and place it in a beaker, add 0.2ml of ammonia water with a mass concentration of 25-28% to promote the slurry flocculation effect, heat at 100°C and stir for 20 minutes to concentrate To twice the concentration, then loaded into a 10ml syringe, and injected with a 19G needle (inner diameter 0.72mm) at a speed of 36mm / min and printed onto a rotating roller (roller outer diameter 29mm, rotation speed 150 rpm), and Step while printing, the stepping speed is 100mm / min to obtain gel-like graphene oxide fibers;

[0029] (2) the gelatinous graphene oxide fiber obtained in the step (1) is immersed in the ethanol solution (ethanol volume concentration 99.7%) and solidified for 5 minutes together with the roller, and is taken out to obtain the ribbon-shaped graphene oxide fi...

Embodiment 2

[0033] A kind of self-crimping preparation method of hollow graphene fiber, the specific operation steps are as follows:

[0034] (1) Weigh 20g of commercial graphene oxide slurry with a mass concentration of 0.94% and place it in a beaker, add 0.2ml of ammonia water with a mass concentration of 25-28% to promote the slurry flocculation effect, heat at 100°C and stir for 20 minutes to concentrate To double the concentration, then put it into a 10ml syringe, use a 16G needle (inner diameter 1.15mm) to inject and print on a rotating roller at a speed of 50mm / min (roller outer diameter 29mm, rotation speed 150 rpm, roller The diameter is 29mm), and printing while stepping, the stepping speed is 100mm / min, obtains the gelatinous graphene oxide fiber;

[0035] (2) the gelatinous graphene oxide fiber obtained in the step (1) is immersed in the ethanol solution (ethanol volume concentration ≥ 95%) and solidified for 5-10 minutes together with the roller, and taken out to obtain the r...

Embodiment 3

[0039] A kind of self-crimping preparation method of hollow graphene fiber, the specific operation steps are as follows:

[0040] (1) Weigh 20g of commercial graphene oxide slurry with a mass concentration of 0.94% and place it in a beaker, add 0.2ml of ammonia water with a mass concentration of 25-28% to promote the slurry flocculation effect, heat at 100°C and stir for 20 minutes to concentrate To double the concentration, then put it into a 10ml syringe, use a 22G needle (inner diameter 0.4mm) to inject and print on the rotating roller at a speed of 36mm / min (roller outer diameter 29mm, rotation speed 150 rpm), and Step while printing, the stepping speed is 100mm / min to obtain gel-like graphene oxide fibers;

[0041] (2) the gelatinous graphene oxide fiber obtained in the step (1) is immersed in the ethanol solution (ethanol volume concentration ≥ 95%) and solidified for 3-5 minutes together with the roller, and taken out to obtain the ribbon-shaped graphene oxide fiber; ...

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Abstract

The invention discloses a self-crimping preparation method of hollow graphene fibers, comprising the following operation steps: (1) injecting and printing graphene oxide slurry onto a rotating roller to obtain gelatinous graphene oxide fibers; ( 2) immersing in a coagulation bath to solidify, and taking out to obtain a ribbon-shaped graphene oxide fiber; (3) peeling off the roller and drying to obtain a hollow graphene oxide fiber; (4) reducing to obtain a hollow graphene oxide fiber. The method of the invention obtains fibers of different diameters by adjusting the parameters of the equipment, and adds the unilateral support of the roller during the coagulation process to form a compact microstructure, and the obtained hollow graphene fibers have a tensile strength of 190.5MPa and a tensile strength of 6.1%. Tensile deformation, showing more than 5000 times of bending resistance; the specific capacitance of the prepared supercapacitor reaches 170.6F g ‑1 , which has huge potential application prospects in flexible and wearable energy storage devices.

Description

technical field [0001] The invention relates to a preparation method and application of a hollow graphene fiber, in particular to a self-crimping preparation method and application of a hollow graphene fiber. Background technique [0002] Graphene is a carbon atom sp 2 The two-dimensional monolayer material with honeycomb structure formed by hybridization has excellent electrical, optical, thermal and mechanical properties, and has broad application prospects. To realize these applications, single-layer graphene flakes are assembled into various macrostructures, such as films, sponges, ribbons, and fibers. Among them, graphene fibers, due to their high electrical conductivity, flexibility, and strength, play an important role in flexible and wearable electronics, and have received widespread attention. Currently, state-of-the-art applied research covers flexible batteries, wearable supercapacitors, and sensors, among others. [0003] So far, the research on the preparatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/22D01D5/24D01D5/06D01D11/06D01F9/12
CPCD01D5/22D01D5/24D01D5/06D01D11/06D01F9/12Y02E60/13
Inventor 兰兴先田植群沈培康
Owner GUANGXI UNIV
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