Self-curling preparation method and application of hollow graphene fibers

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.

Active Publication Date: 2021-09-14
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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  • Self-curling preparation method and application of hollow graphene fibers
  • Self-curling preparation method and application of hollow graphene fibers
  • Self-curling preparation method and application of hollow graphene fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of self-curling preparation method of hollow graphene fiber, concrete 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 flocculation effect of the slurry, heat at 100°C and stir for 20 minutes to concentrate To double the concentration, then pack into a 10ml syringe, inject and print on the rotating roller (roller outer diameter 29mm, rotation speed 150 rpm) with a 19G needle (inner diameter 0.72mm) at a speed of 36mm / min, and Stepping while printing, the stepping speed is 100mm / min, to obtain gel-like graphene oxide fibers;

[0029] (2) Soak the gelatinous graphene oxide fiber obtained in step (1) together with the roller into an ethanol solution (99.7% ethanol volume concentration) and solidify for 5 minutes, take it out, and obtain a ribbon-shaped graphene oxide fiber;

[0030] (3) ...

Embodiment 2

[0033] A kind of self-curling preparation method of hollow graphene fiber, concrete 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 flocculation effect of the slurry, heat at 100°C and stir for 20 minutes to concentrate To double the concentration, then pack into a 10ml syringe, inject and print on the rotating roller with a 16G needle (1.15mm inner diameter) at a speed of 50mm / min (the outer diameter of the roller is 29mm, the rotation speed is 150 rpm, the roller The diameter is 29mm), and stepping while printing, the stepping speed is 100mm / min, to obtain gel-like graphene oxide fibers;

[0035] (2) Soak the gel-like graphene oxide fiber obtained in step (1) together with the roller into an ethanol solution (ethanol volume concentration ≥ 95%) and solidify for 5-10 minutes, take it out, and obta...

Embodiment 3

[0039] A kind of self-curling preparation method of hollow graphene fiber, concrete 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 flocculation effect of the slurry, heat at 100°C and stir for 20 minutes to concentrate To double the concentration, then pack into a 10ml syringe, use a 22G needle (inner diameter 0.4mm) to inject and print on a rotating roller (roller outer diameter 29mm, rotation speed 150 rpm) at a speed of 36mm / min, and Stepping while printing, the stepping speed is 100mm / min, to obtain gel-like graphene oxide fibers;

[0041] (2) Soak the gel-like graphene oxide fiber obtained in step (1) together with the roller into an ethanol solution (ethanol volume concentration ≥ 95%) and solidify for 3-5 minutes, take it out, and obtain ribbon-shaped graphene oxide fiber;

[0042] (3) pe...

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Abstract

The invention discloses a self-curling preparation method of hollow graphene fibers. The self-curling preparation method of the hollow graphene fibers comprises the following operation steps of (1) injecting and printing graphene oxide slurry onto a rotating roller to obtain gelatinous graphene oxide fibers; (2) soaking in a coagulating bath for coagulating, and taking out to obtain belt-shaped graphene oxide fibers; (3) stripping from the roller, and drying to obtain the hollow graphene oxide fibers; and (4) reducing to obtain the hollow graphene fibers. According to the method disclosed by the invention, the fibers with different diameters are obtained by adjusting equipment parameters, and a compact microstructure is formed by combining single-side support of the roller in a solidification process, so that the obtained hollow graphene fibers have the tensile strength of 190.5 MPa and the tensile deformation of 6.1 percent, and show the bending resistance of more than 5000 times; and the specific capacitance of a prepared supercapacitor reaches 170.6 F g <-1 >, and the supercapacitor has a huge potential application prospect in flexible and wearable energy storage equipment.

Description

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

Claims

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Application Information

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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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