Chemical-free production of graphene materials

A graphite material, graphene technology, applied in graphene, inorganic chemistry, nanotechnology for materials and surface science, etc., can solve cumbersome washing and purification steps, unsuitable for mass production of isolated graphene sheets, long intercalation and oxidation time

Active Publication Date: 2018-08-21
NANOTEK INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (1) The method requires the use of large quantities of several undesirable chemicals such as sulfuric acid, nitric acid, and potassium permanganate or sodium chlorate
[0011] (2) The chemical treatment process requires a long intercalation and oxidation time, typically 5 hours to 5 days
[0014] (5) Both heat- and solution-induced puffing methods require very tedious washing and purification steps
However, these methods are not suitable for mass production of isolated graphene sheets for composites and energy storage applications

Method used

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  • Chemical-free production of graphene materials
  • Chemical-free production of graphene materials
  • Chemical-free production of graphene materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0082] Example 1: Isolated NGP (graphene sheet) from flake graphite via a polypropylene powder based support

[0083] In the experiment, 1 kg of polypropylene pellets, 50 g of flake graphite, 50 mesh (average particle size 0.18 mm; Asbury Carbons, Asbury NJ) and 250 g A magnetic stainless steel needle (Raytech Industries, Middletown CT) was placed in the ball mill vessel. The ball mill was operated at 300 rpm for 4 hours. The container cap is removed and the stainless steel needle is removed via the magnet. The polymeric support material was found to be coated with a black carbon layer. The support material was placed on a 50 mesh screen and a small amount of raw flake graphite was removed. The coated support material was then placed in a crucible in a ventilated furnace at 600°C. After cooling, the furnace was opened to reveal a crucible filled with isolated graphene flake powder.

[0084] Although polypropylene (PP) is used here as an example, the support material used ...

example 2

[0085] Example 2: NGP from expanded graphite via ABS polymer

[0086] In the experiment, 100 grams of ABS pellets as solid carrier material particles were placed in a 16 oz plastic container along with 5 grams of expanded graphite. The container was placed in an acoustic mixing unit (Resodyn Acoustic mixer company) and processed for 30 minutes. After processing, the support material was found to be coated with a thin layer of carbon. The support material was placed in acetone and subjected to ultrasonic energy to accelerate the dissolution of the ABS. The solution was filtered using an appropriate filter and washed four times with additional acetone. Following washing, the filtrate was dried in a vacuum oven set at 60°C for 2 hours.

example 3

[0087] Example 3: Functionalization of Graphene via PLA via Mesocarbon Microspheres (MCMB)

[0088]In one example, 100 grams of PLA pellets (carrier material) and 2 grams of MCMB (China Steel Chemical Co., Taiwan) were placed in a vibratory ball mill that also contained magnetic stainless steel impactor particles, and process for 2 hours. Subsequently, DETA was added and the material mixture was processed for another 2 hours. The vibratory mill was then turned on, and the support material was found to be coated with a black coating of graphene. Magnetic steel particles are removed with a magnet. The support material was rinsed with isopropanol and placed on a vacuum filter. The vacuum filter was heated to 160°C and vacuum was applied, resulting in removal of the PLA.

[0089] In separate experiments, the following functional group-containing species were introduced into the resulting graphene sheets: amino acids, sulfonic acid groups (--SO 3 H), 2-azidoethanol, polyamide ...

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Abstract

A method of producing isolated graphene sheets directly from a graphitic material, comprising: a) mixing multiple particles of a graphitic material and multiple particles of a solid carrier material to form a mixture in an impacting chamber of an energy impacting apparatus; b) operating the impacting apparatus for peeling off graphene sheets from the graphitic material and transferring these graphene sheets to surfaces of solid carrier material particles to produce graphene-coated solid particles inside the impacting chamber; c) separating the graphene sheet from the solid carrier material particle surfaces to recover isolated graphene sheets. The method enables production of graphene sheets directly from a graphitic material without going through a chemical intercalation or oxidation procedure. The process is fast (hours as opposed to days of conventional processes), has low or no water usage, environmentally benign, cost effective, and highly scalable.

Description

technical field [0001] The present invention relates to the field of graphene materials, and in particular to a method of producing isolated graphene sheets in an environmentally friendly manner. Background technique [0002] Single-layer graphene sheets are made of carbon atoms occupying a two-dimensional hexagonal lattice. Multilayer graphene is a platelet composed of more than one plane of graphene. Individual single-layer graphene sheets and multi-layer graphene platelets are collectively referred to herein as nanographene platelets (NGPs) or graphene materials. NGPs include pristine graphene (essentially 99% carbon atoms), slightly oxidized graphene (<5% oxygen by weight), graphene oxide (≥5% oxygen by weight), slightly fluorinated graphite ene (<5% by weight fluorine), fluorinated graphene (>5% by weight fluorine), other halogenated graphene, and chemically functionalized graphene. [0003] NGPs have been found to possess a range of unusual physical, chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C15/00B82Y30/00B82Y40/00
CPCC01B2204/04C01B32/19C01B32/194B82Y40/00Y10S977/734Y10S977/842C01B2202/04C01B2202/02
Inventor 阿茹娜·扎姆张博增
Owner NANOTEK INSTR
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