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A kind of graphene airgel microsphere with gradient pore structure and its preparation method and application

A technology of graphene airgel and gradient pores, which is applied in the field of nanoporous materials, can solve problems such as the failure to realize the preparation of gradient pore structure graphene airgel microspheres, and achieve rich connotations and applications, large specific surface area, and structural full effect

Active Publication Date: 2021-09-07
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical problem that the prior art fails to realize the preparation of graphene airgel microspheres with gradient pore structure, the present invention provides a graphene airgel microsphere with gradient pore structure and its preparation method and application

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  • A kind of graphene airgel microsphere with gradient pore structure and its preparation method and application
  • A kind of graphene airgel microsphere with gradient pore structure and its preparation method and application
  • A kind of graphene airgel microsphere with gradient pore structure and its preparation method and application

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preparation example Construction

[0032]The present invention provides a kind of preparation method of the graphene airgel microsphere with gradient pore structure in the first aspect, described method comprises the steps:

[0033] (1) Graphene oxide powder, lithium salt and ionic liquid are carried out ultrasonic dispersion, obtain graphene oxide ionic liquid solution; In the present invention, utilize ionic liquid to disperse graphene oxide powder; Ionic liquid is as a kind of green " universal "Solvent" has a good dissolving and dispersing ability to graphene oxide powder; in the present invention, the solubility of the lithium salt in the ionic liquid is large enough to ensure that a sufficiently large osmotic pressure difference is rapidly removed from the surrounding environment. Sufficient moisture is absorbed to induce phase separation in the ionic liquid; other common inorganic salts such as NaCl, etc., have insufficient solubility in the ionic liquid to induce phase separation.

[0034] (2) Use the g...

Embodiment 1

[0088] ①Into a 200mL beaker, add 5g of single-layer graphene oxide powder with a sheet diameter of 50-100nm prepared by the Hummers method, 30g of commercially available lithium salt of bistrifluoromethanesulfonimide, and the synthesized 1-ethyl-3 - 100 g of heptyl imidazole bistrifluoromethanesulfonimide ionic liquid was ultrasonically dispersed for 8 hours by an ultrasonic cleaner with a power of 1000 W to obtain a uniform graphene oxide ionic liquid solution, ready for use.

[0089] ②Use the self-made microfluidic glass chip system to prepare graphene oxide ionic liquid micro-droplets, use a plastic hose and a 5mL disposable syringe to pass the graphene oxide ionic liquid solution as a dispersed phase into the circular glass tube, use plastic The flexible tube and 20mL disposable syringe are passed into the gap between the square glass tube and the circular glass tube with a mass fraction of 10% PVA aqueous solution as the continuous phase, and the Harvard pump is used to ac...

Embodiment 2

[0100] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0101] In step ①, 2 g of single-layer graphene oxide powder with a sheet diameter of 50-100 nm prepared by the Hummers method, 20 g of commercially available lithium salt of bistrifluoromethanesulfonimide, and the synthesized 1- Ethyl-3-heptyl imidazole bistrifluoromethanesulfonimide ionic liquid 100g was ultrasonically dispersed for 8 hours by an ultrasonic cleaner with a power of 1000W to obtain a uniform graphene oxide ionic liquid solution, ready for use.

[0102] The graphene airgel microsphere with gradient pore structure obtained in this example has a diameter of 780 μm, has a three-dimensional network pore structure and is distributed in a gradient, and the pore diameter gradually and continuously transitions from the nanopore of 50 nm at the center of the microsphere to the outermost side of the microsphere Micropores of 20 μm.

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Abstract

The present invention relates to a graphene airgel microsphere with gradient pore structure and its preparation method and application. The method comprises: (1) ultrasonically dispersing graphene oxide powder, lithium salt and ionic liquid to obtain graphene oxide ions liquid solution; (2) use the microfluidic glass chip system to prepare graphene oxide ionic liquid micro-droplets; (3) the micro-droplets absorb water and undergo phase separation to form a microemulsion with a gradient pore structure; (4) the microemulsion undergoes a reduction reaction to obtain Gradient pore structure graphene ionic liquid composite wet gel microspheres; (5) washing away ionic liquid and lithium salt to obtain gradient pore structure graphene wet gel microspheres; (6) atmospheric drying to obtain gradient pore structure graphene air condensation glue microspheres. The invention provides a brand-new method for preparing graphene airgel microspheres with gradient pore structure, which solves the technical problem that the prior art fails to realize the preparation of graphene airgel microspheres with gradient pore structure, and enriches graphite The connotation and application of alkene airgel microspheres.

Description

technical field [0001] The invention belongs to the technical field of nanoporous materials, and relates to a preparation method of graphene airgel, in particular to a graphene airgel microsphere with a gradient pore structure and a preparation method and application thereof. Background technique [0002] Graphene airgel is a graphene macroscopic material with a three-dimensional continuous porous network structure that is physically or chemically three-dimensionally lapped, stacked, and assembled between two-dimensional graphene flakes. Many unique properties at the nanoscale are exhibited at the macroscale, with many excellent properties including ultra-high porosity, ultra-low density, ultra-high elasticity, low dielectric constant, and excellent photothermal / electrothermal conversion capabilities. Compared with traditional large-scale graphene aerogels, microspherical graphene aerogels with a diameter between 1 and 1000 μm can bring new breakthroughs in the preparation, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/184
CPCC01B32/184
Inventor 张晚林刘圆圆高宇智纪旭阳张贝贝李文静杨洁颖赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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