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Preparation method of graphene aqueous solution and graphene nanosheet

A technology of graphene nanosheets and olefin aqueous solution, applied in the field of graphene, can solve the problems of low purity of graphene and failure to meet high purity requirements, and achieve the effect of improving efficiency and output

Pending Publication Date: 2022-07-12
湖州市吴兴区核源金属新材研究院
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

When graphene is used in fields that require relatively high purity, such as in electronics, medicine, and aerospace, because natural graphite contains impurities, such as quartz, silicon dioxide, sulfur, iron (high ppm), Nickel, dust, etc. lead to low purity of graphene, and the existing technology cannot meet the high purity requirements in these fields, as well as the requirements for applications such as electronics

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  • Preparation method of graphene aqueous solution and graphene nanosheet
  • Preparation method of graphene aqueous solution and graphene nanosheet

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preparation example Construction

[0036]A graphene aqueous solution and a method for preparing graphene nanosheets, wherein the solid substances in the graphene aqueous solution are very few-layer graphene, few-layer graphene and multi-layer graphene. The number of layers of very few-layer graphene is 1-3 layers, the number of layers of few-layer graphene is 4-5 layers, and the number of layers of multi-layer graphene is 6-10 layers. The number of layers of graphene nanosheets is 11 to 500 layers.

[0037] First, the selection and screening of raw materials are carried out. Selection of raw materials: natural graphite particles are selected, and natural graphite particles are selected because natural graphite particles have low artificial energy consumption and relatively low cost when dispersing and separating, while artificially synthesized graphite particles are disintegrating and separating. The energy consumption is huge, it is not easy to separate, and the cost is relatively high. Raw material sieving:...

Embodiment 1

[0039] Step (1) Add 200 grams of sodium deoxycholate SDC into 20 liters of deionized water (conductivity 0.08 μs / cm), and then add 1000 grams of sieved natural graphite particles to obtain a colloidal suspension.

[0040] Step (2) stirring and shearing: the colloidal suspension is stirred and sheared by a shearing device, the working speed of the shearing device is 8000 rpm, and the working time is 8 hours to obtain a colloidal solution in the form of stable graphite particles. The solid substances in the colloidal solution include few-layer graphene, multi-layer graphene, graphene nanosheets and graphite particles. In the process of stirring and shearing, a defoamer is added, and the defoamer is an industrial water-based defoamer.

[0041] Step (3) Ultrasonic vibration: the colloidal solution is introduced into an ultrasonic machine or an ultrasonic electrode machine, and ultrasonically oscillated for 2 hours at room temperature, and the ultrasonic frequency is 40 kHz.

[00...

Embodiment 2

[0047] Step (1) Add 100 grams of sodium deoxycholate SDC into 15 liters of deionized water (conductivity 0.1 μs / cm), and then add 1000 grams of sieved natural graphite particles to obtain a colloidal suspension.

[0048] Step (2) stirring and shearing: the colloidal suspension is stirred and sheared by a shearing device, the working speed of the shearing device is 10,000 rpm, and the working time is 6 hours to obtain a colloidal solution in the form of stable graphite particles. The solid substances in the colloidal solution include few-layer graphene, multi-layer graphene, graphene nanosheets and graphite particles.

[0049] Step (3) ultrasonic vibration: the colloidal solution is introduced into the ultrasonic machine or the ultrasonic electrode machine, and the ultrasonic vibration is carried out for 3 hours at normal temperature, and the ultrasonic frequency is 20 kHz.

[0050] Step (4) high-pressure emulsification: place the oscillated colloidal solution in a high-pressur...

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Abstract

The invention discloses a preparation method of a graphene aqueous solution and a graphene nanosheet. According to the method, graphite particles with the particle size smaller than or equal to 20 microns are selected, a dispersing agent and the graphite particles are added into deionized water, obtained colloidal suspension is stirred and sheared, a colloidal solution is obtained, and solid matter comprises few-layer graphene, multi-layer graphene, graphene nanosheets and graphite microparticles. And carrying out ultrasonic oscillation on the colloidal solution and then carrying out high-pressure emulsification to obtain graphene slurry containing few layers of graphene, few layers of graphene, multiple layers of graphene and graphene nanosheets. After the graphene slurry is subjected to centrifugal separation twice, an obtained supernatant is a graphene aqueous solution, and the graphene nanosheets are obtained after precipitation and drying. The method provided by the invention solves the problems in the prior art, realizes large-scale and high-quality production of two products of the graphene aqueous solution and the graphene nanosheets, not only improves the product quality, but also realizes mass production.

Description

technical field [0001] The invention belongs to the technical field of graphene, and relates to a graphene aqueous solution and a method for preparing graphene nanosheets. Background technique [0002] Graphene is a sp 2 Hybrid connection of carbon atoms tightly packed into a new material with a single-layer two-dimensional honeycomb lattice structure, graphene has excellent optical, electrical, mechanical properties, in materials science, micro-nano processing, energy, biomedicine and drug delivery, etc. It has important application prospects and is considered to be a revolutionary material in the future. [0003] Since graphene was successfully prepared by scientists for the first time in 2004, this new material has received extensive attention from scientists. Since graphene is a zero-bandgap semiconductor, the electrons moving on it are similar to massless relativistic particles, so graphene exhibits ultra-high electron mobility (greater than 15000 cm 2 / V s), is expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/19C01B32/194
CPCC01B32/19C01B32/194C01B2204/04C01B2204/28Y02E60/13
Inventor 西瓦桑布·博姆钟婷婷冯登华郭洪良田润
Owner 湖州市吴兴区核源金属新材研究院
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