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Graphene aerogel hollow fiber, its preparation method and application

A graphene aerogel, graphene hydrogel technology, applied in the manufacture of hollow filaments, chemical characteristics of fibers, chemical instruments and methods, etc. Multi-functional applications and other issues, to achieve excellent fluid transport performance, high-efficiency light-to-heat conversion performance, and low cost

Active Publication Date: 2022-04-29
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, most hollow fibers are mainly made of polymers, which greatly limits the application of hollow fibers in the fields of intelligent response, intelligent fluid transmission, and electrochemical energy storage.
In addition, the limitation of materials affects the multifunctional application of hollow fibers, which greatly limits the application expansion of hollow fibers

Method used

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  • Graphene aerogel hollow fiber, its preparation method and application
  • Graphene aerogel hollow fiber, its preparation method and application
  • Graphene aerogel hollow fiber, its preparation method and application

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preparation example Construction

[0076] Another aspect of the embodiments of the present invention also provides a method for preparing the aforementioned graphene airgel hollow fiber, which includes:

[0077] 1) Using coaxial needle-assisted sol-gel technology to prepare graphene hydrogel hollow fibers;

[0078] 2) Carry out supercritical fluid drying and / or freeze-drying treatment to described graphene hydrogel hollow fiber, while keeping gel network from being destroyed, remove solvent molecule in gel, obtain graphene airgel hollow fiber fiber.

[0079] In some preferred embodiments, the step 1) specifically includes:

[0080] A graphene oxide liquid crystal is provided, wherein the graphene oxide liquid crystal is concentrated from a graphene oxide aqueous solution, the graphene oxide aqueous solution is subjected to high-speed centrifugation, and the lower layer dispersion is collected to obtain the graphene oxide liquid crystal;

[0081] Inject the graphene oxide liquid crystal into the coagulation ba...

Embodiment 1

[0115] (a) 5mg / mL graphene oxide liquid crystal and 0.001wt% HCl solution were injected into 0.1wt% HCl solution at the same time through a coaxial needle at an injection speed of 10 μL / min to obtain a continuous graphene oxide hydrogel hollow fiber.

[0116] (b) soaking the graphene oxide hydrogel hollow fiber in step a) in an aqueous ascorbic acid solution, and standing at 5° C. for 72 hours to obtain a graphene hydrogel fiber.

[0117] (c) replacing the graphene hydrogel hollow fiber in step b) with an ethanol solvent, and supercritically drying at 33° C. for 24 hours to obtain a graphene airgel hollow fiber.

[0118] (d) uniaxially weaving the graphene airgel hollow fiber into a fabric in step c), and then crimping it to obtain a graphene airgel hollow fiber reel. Then the reel is soaked in the silica gel pre-solidified solution and cured to obtain the silica gel-graphene airgel hollow fiber reel composite. Test water evaporation performance under 1.0 sun.

[0119] The ...

Embodiment 2

[0122] (a) 15mg / mL graphene oxide liquid crystal and 6wt% calcium chloride solution are simultaneously injected into 3wt% cetyltrimethylammonium bromide aqueous solution at an injection speed of 50 μL / min through a coaxial needle to obtain continuous graphene oxide hydrogel hollow fibers.

[0123] (b) soaking the graphene oxide hydrogel hollow fiber in step a) in an aqueous solution of hydroiodic acid, and standing at 100°C for 0.5h to obtain a graphene hydrogel fiber.

[0124] (c) Freeze-drying the graphene hydrogel hollow fiber in step b) at -50° C. for 24 hours to obtain a graphene airgel hollow fiber.

[0125] (d) Integrating and winding the graphene airgel hollow fibers in step c) into bundles, then immersing the graphene airgel hollow fiber bundles in the ethylene oxide pre-solidified liquid, curing to obtain ethylene oxide - Graphene airgel hollow fiber bundle composite. Test water evaporation performance under 1.0 sun.

[0126] The scanning electron microscope photo...

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Abstract

The invention discloses a graphene airgel hollow fiber, its preparation method and application. The graphene airgel hollow fiber has an annular, closed graphene airgel wall and a pipe cavity running through the axial direction of the fiber, and the graphene airgel wall has a three-dimensional overlapping formed by graphene sheets. , a continuous three-dimensional porous network, the pipeline cavity is enclosed by graphene airgel walls. The preparation method comprises: using coaxial needle-assisted sol-gel technology to prepare a graphene hydrogel hollow fiber, and then performing supercritical fluid drying and / or freeze drying on it to obtain a graphene airgel hollow fiber . The graphene airgel hollow fiber of the present invention has excellent mechanical flexibility, water transmission performance and light-to-heat conversion performance, and has important applications in the fields of light-to-heat conversion, fluid transportation, seawater desalination, etc., and the preparation process is simple and the reaction conditions Mild, can realize continuous production.

Description

technical field [0001] The invention relates to a graphene airgel hollow fiber, a preparation method and application thereof, and belongs to the technical field of nanometer energy. Background technique [0002] Graphene is based on sp 2 The honeycomb crystal structure formed by the closely arranged hybridized carbon atoms is only the thickness of one carbon atom layer (0.34nm), which is the thinnest material found so far. Graphene can be imagined as an atomic grid formed by carbon atoms and their covalent bonds. The preparation method of graphene has gradually expanded from the initial tape tearing method / slight friction method to various other methods, such as epitaxial growth, CVD growth, redox method, etc. The structure of graphene is very stable, the carbon-carbon bond is only The connection between carbon atoms inside graphene has a certain degree of flexibility. When an external force is applied to graphene, the surface of the carbon atoms will be bent and deforme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/12D01F1/08D01F1/10C02F1/14C02F103/08
CPCD01F9/12D01F1/08D01F1/10C02F1/14C02F2103/08Y02A20/142Y02A20/212Y02A20/124
Inventor 张学同李广勇
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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