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Method for separating dimension of graphene oxide

A graphene, size technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as can not be effectively avoided

Active Publication Date: 2018-06-01
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing graphene oxide by adjusting the chemical reaction or selecting graphite with different sizes still cannot effectively avoid the damage to the size of graphene oxide by strong oxidants and ultrasound in the process of strong oxidation and exfoliation.

Method used

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  • Method for separating dimension of graphene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Preparation of Graphene Oxide

[0061] 1. Pre-oxidized graphite

[0062] Weigh 2.5g of phosphorus pentoxide and 2.5g of potassium persulfate, and add them into a 250mL Erlenmeyer flask. Add 20mL of concentrated sulfuric acid under constant stirring, heat to 80°C, slowly add 3g of graphite powder to the solution, keep the temperature of the solution at 80°C for 4.5h, then cool to room temperature. Then slowly add deionized water. During this process, ensure that the temperature of the solution does not exceed 80°C. The mixture is allowed to stand overnight, filtered to remove excess concentrated sulfuric acid, and dried at 60°C.

[0063] 2. Preparation of Graphite Oxide

[0064] Add the dried pre-oxidized graphite into 120mL of concentrated sulfuric acid, and slowly add 15g of potassium permanganate while stirring continuously. This process is carried out in an ice bath, and the temperature of the whole process is guaranteed to be below 80°C, and the stirring is contin...

Embodiment 2

[0070] Size separation of graphene oxide

[0071] 1. Stir and disperse the graphene oxide prepared in Example 1 into deionized water to obtain a uniform and stable 0.1 mg / ml graphene oxide aqueous dispersion.

[0072] 2. Transfer the above-mentioned uniform and stable graphene oxide aqueous dispersion into a sealed plastic tube, and the liquid surface of the graphene oxide aqueous dispersion is at a certain distance from the mouth of the tube. The plastic centrifuge tube is 4cm long and 2cm in diameter.

[0073] 3. Equilibrate the above aqueous dispersion of graphene oxide that needs to be separated at 25° C. for 30 minutes.

[0074] 4. Fill liquid nitrogen into a plastic petri dish with a diameter of 10 cm, and place the plastic petri dish containing liquid nitrogen above the plastic tube containing the graphene oxide aqueous dispersion.

[0075] 5. Control the freezing and solidification speed of the graphene oxide aqueous dispersion by adjusting the distance between the g...

Embodiment 3

[0080] Printing preparation of graphene conductive wires

[0081] The graphene oxide dry powders in various size ranges after freeze-drying in Example 2 were dispersed into deionized water to prepare dispersions with a concentration of 20 mg / ml.

[0082] 1. Put these high-viscosity graphene oxide aqueous dispersions into the dispenser syringe (3cm 3 ), sealed with a needle with an inner diameter of 200 μm.

[0083]2. Use an air pressure pump (Ultimus Ⅰ, EFD, Inc) to provide a suitable pressure to pump out the water-based graphene oxide ink, and form regular and orderly lines according to the preset procedure.

[0084] 3. Place the printed graphene oxide wire in a dry environment and dry it at 60°C for 12 hours.

[0085] 4. Transfer the dried graphene oxide thread to a closed glass bottle, and add 3-5 drops of HI (40%) aqueous solution to the glass bottle, and let it stand for 12 hours under dark conditions.

[0086] 5. Take out the graphene oxide conductive wire after chemi...

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Abstract

The invention provides a method for realizing graphene oxide dimension separation by icing and solidification, and belongs to the technical field of nano-material processing technology. The method controls icing and solidification speed of graphene oxide aqueous dispersion, in order to realize separation of graphene oxide of different dimensions. Because diffusion speeds of graphene oxide of different dimensions are different, densities of oxygen-containing function groups are different, so that mutual combination capabilities between graphene oxide and ice crystal are different, smaller graphene oxide has fast diffusion speed, density of oxygen-containing function group is high, and the smaller graphene oxide can rapidly combine with ice crystal; on the contrary, larger graphene oxide hasrapid diffusion speed, density of oxygen-containing function group is low, and the larger graphene oxide has weaker combination capability with ice crystal. Speeds of icing and solidification are controlled, so that graphene oxide with required dimension and redox distribution can be accurately separated.

Description

technical field [0001] The invention relates to a method for size separation of graphene oxide, in particular to a method for separating graphene oxide with different sizes by freezing and solidifying an aqueous dispersion of graphene oxide and controlling the solidification speed. The invention belongs to the technical field of nanometer material processing technology. Background technique [0002] Graphene oxide is a two-dimensional material with a special arrangement of carbon atoms. Since the discovery of graphene oxide, its unique electrical, optical, biological, mechanical and other properties have attracted the attention of researchers from all walks of life, so oxidation Graphene is widely used in many fields such as batteries, photoelectric conversion, catalysis, drug loading, antibacterial and surface modification. [0003] Various properties of graphene oxide are affected by its own physical and chemical properties, including sheet size distribution, redox degree...

Claims

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Application Information

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IPC IPC(8): C01B32/198
CPCC01P2002/72
Inventor 耿洪亚刘凯白国英刘杰吴书旺王亚玲王健君
Owner INST OF CHEM CHINESE ACAD OF SCI
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