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Method for preparing high orientation graphene aerogel

A graphene airgel and high-orientation technology, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problems of lack of graphene dispersion system pretreatment and pre-orientation, poor product structure order, etc., and achieve good The effects of elasticity, ease of handling, and excellent thermal and electrical conductivity

Active Publication Date: 2016-10-26
SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods lack the pretreatment and preorientation of the graphene dispersion system, resulting in poor product structure order
Fabrication of graphene aerogels with highly oriented structures remains a great challenge

Method used

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  • Method for preparing high orientation graphene aerogel
  • Method for preparing high orientation graphene aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 1g of graphene, 6g of water, and use 12KHz ultrasonic treatment for 1 hour at 24°C to obtain a graphene dispersion;

[0036] (2) the graphene dispersion that step (1) is obtained is placed in the container with electrode, is 1000Hz by frequency, and the applied electric field that strength is 2000V / m is oriented to solution 100 minutes, obtains the highly oriented graphene dispersion;

[0037] (3) The highly oriented graphene dispersion liquid that step (2) obtains is continued to maintain the action of the electric field, frozen and solidified in liquid nitrogen, and then further freeze-dried or critically freeze-dried for 40 hours to obtain a highly oriented graphene aerogel;

[0038] Such as figure 2 As shown, the obtained highly oriented graphene airgel, the graphene is oriented and arranged to form through holes along the direction of the electric field, and the density is 0.2g / cm 3 , the compressive strength perpendicular to the direction of the orientat...

Embodiment 2

[0040] (1) Add 1g of graphene, 100g of water, and obtain a graphene dispersion at 60° C. with 5KHz ultrasonic treatment for 10 hours;

[0041] (2) the graphene dispersion prepared by step (1) is placed in a container with electrodes, and the frequency is 50 Hz, and an applied electric field with an intensity of 1000 V / m is oriented to the solution for 80 minutes to obtain a highly oriented graphene dispersion;

[0042] (3) The highly oriented graphene dispersion obtained in step (2) is kept under the action of an electric field, frozen and solidified in liquid nitrogen, and then further freeze-dried or critically freeze-dried for 3 hours to obtain a highly oriented graphene aerogel;

[0043] The obtained highly oriented graphene airgel, the graphene is oriented and arranged to form through holes along the direction of the electric field, and the density is 0.01g / cm 3 , the compressive strength perpendicular to the orientation electric field direction is 1MPa, the orientation d...

Embodiment 3

[0045] (1) Add 1g of graphene oxide, 30g of water, and use 10KHz ultrasonic treatment for 5 hours at 40°C to obtain a graphene oxide dispersion;

[0046] (2) Place the graphene oxide dispersion prepared in step (1) in a container with electrodes, and pass an applied electric field with a frequency of 500 Hz and an intensity of 2000 V / m to orient the solution for 50 minutes to obtain highly oriented graphene oxide dispersion liquid;

[0047] (3) The highly oriented graphene oxide dispersion obtained in step (2) is continuously maintained under the action of an electric field, frozen and solidified in liquid nitrogen, and then further freeze-dried for 25 hours to obtain a highly oriented graphene oxide aerogel;

[0048] (4) the ordered porous graphene oxide airgel obtained in step (3) is reduced by heat treatment to obtain ordered porous graphene oxide airgel;

[0049] The obtained highly oriented graphene airgel, the graphene is oriented and arranged to form through holes along ...

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Abstract

The invention discloses a high orientation graphene aerogel and a preparation method thereof. The method comprises the steps of first preparing a dispersion liquid of graphene or graphene oxide, placing the dispersion liquid of graphene or graphene oxide in a container with an electrode, obtaining a high orientation graphene or graphene oxide dispersion liquid through an additional electric field orientation method, continuing to maintain an electric field effect, performing freeze freezing in liquid nitrogen, and obtaining the high orientation graphene aerogel after freeze drying or supercritical drying. The high orientation graphene aerogel is high in porosity, pores have a very high degree of orientation in an electric field direction, the pore size is controllable, and the high orientation graphene aerogel can be used for electrode materials of batteries and super capacitors, electron field emission sources, heat insulating and radiating materials, adsorbing materials, high flux water filter materials and catalyst carriers and the like.

Description

technical field [0001] The invention relates to the field of preparation of graphene airgel, in particular to a preparation method of highly oriented graphene airgel. Background technique [0002] Graphene is a two-dimensional crystal of a single molecular layer, which has the highest strength and excellent electrical and thermal conductivity of known materials. It is currently the most ideal two-dimensional nanomaterial. The field has broad application prospects. In 2010, two professors of the University of Manchester, Andre Geim and Konstantin Novoselov, won the Nobel Prize in Physics for the first successful separation of stable graphene, setting off a wave of research on graphene around the world. Macroscopic graphene airgel is one of the main application forms of nanoscale graphene. Because of its large specific surface area, good chemical stability, and good electrical and thermal conductivity, graphene aerogels can be used as electrode materials for batteries and su...

Claims

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Application Information

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IPC IPC(8): C01B31/04C04B38/00
CPCC01P2004/03C04B38/0045
Inventor 刘峥王勤生杨永强刘渊金玲陈小豹
Owner SPECIAL EQUIP SAFETY SUPERVISION INSPECTION INST OF JIANGSU PROVINCE
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