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A method for preparing aqueous graphene dispersion by ultrasonic exfoliation

A technology of graphene dispersion and ultrasonic peeling, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as easy agglomeration, large specific surface area of ​​graphene, technical difficulties, etc., achieve less structural defects, improve Hydrophobicity, effect of avoiding agglomeration

Inactive Publication Date: 2017-04-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene has a large specific surface area, strong hydrophobicity, and there is a strong van der Waals force between graphene and graphene, which makes it easy to agglomerate, so there are still great technical difficulties in preparing high-concentration aqueous graphene.

Method used

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  • A method for preparing aqueous graphene dispersion by ultrasonic exfoliation
  • A method for preparing aqueous graphene dispersion by ultrasonic exfoliation
  • A method for preparing aqueous graphene dispersion by ultrasonic exfoliation

Examples

Experimental program
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Effect test

Embodiment 1

[0037]Add 1 part by mass of graphite to 1000 parts by mass of sodium lignosulfonate (molecular weight 1000Da-2500Da) and CTAB non-covalent bond modified sample aqueous solution with a mass concentration of 1g / L, and then use ultrasonic A cleaning machine (200w) was used for ultrasonic stripping for 100 hours; then centrifuged at a centrifugal acceleration of 3000g and a centrifugation time of 40min to obtain a graphene dispersion.

[0038] Using a UV spectrophotometer, using the absorbance at 660nm, according to Lambert-Beer's law A / l=α 660 ·C G (wherein A is the absorbance at 660nm, C G is the graphene concentration, α 660 =2460, l=0.01), the concentration C of graphene can be obtained by conversion G 0.15g / L.

[0039] The graphene dispersion liquid that above-mentioned preparation obtains is analyzed and observed, and the results are shown in Figure 1~5 . in, figure 1 For using atomic force microscope (manufacturer: South Korea Park company, model: XE100) the topogra...

Embodiment 2

[0045] Add 1 mass part of graphite to 1500 mass parts of sodium lignosulfonate (molecular weight 2500Da ~ 10000Da) and bromotetradecane covalently modified sample aqueous solution with a mass concentration of 2g / L, and then in 30 ℃ Ultrasonic peeling was carried out using an ultrasonic cleaning machine (200w) for 100 hours; then centrifuged, the centrifugal acceleration was 2000g, and the centrifugation time was 30min to obtain the graphene dispersion. Using an ultraviolet spectrophotometer, using the absorbance at 660nm, according to Lambert-Beer's law, the concentration C of graphene can be obtained. G It is 0.13g / L.

Embodiment 3

[0047] Add 1 mass part of graphite to 5000 mass parts of sodium lignosulfonate (molecular weight: 1000Da-2500Da) aqueous solution with a mass concentration of 8g / L, and then use an ultrasonic cleaning machine (200w) at 20°C for ultrasonic peeling for 10 hour; then carry out centrifugation, the centrifugal acceleration is 5000g, and the centrifugation time is 10min, and the graphene dispersion can be obtained. Using an ultraviolet spectrophotometer, using the absorbance at 660nm, according to Lambert-Beer's law, the concentration C of graphene can be obtained. G It is 0.12g / L.

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Abstract

The invention discloses a method for preparing a water-phase graphene dispersion liquid by employing ultrasonic stripping. The method comprises the following steps: adding 1 part of graphite to 500-10,000 parts of a lignin amphiphilic polymer solution with the mass concentration of 0.1-10g / L; carrying out ultrasonic stripping at 20-60 DEG C for 10-100 hours by virtue of an ultrasonic cleaning machine; and then centrifugally separating to obtain the graphene dispersion liquid. According to the method disclosed by the invention, a lignin amphiphilic polymer is adopted as a natural polymer dispersant of water-phase graphene for the first time; the graphene in the prepared dispersion liquid is few in structure defect and few in layers; the lowest concentration is 0.1g / L; the excellent performance of the graphene is well reserved; the method can be widely applied to the fields such as catalysts, sensors and conducting materials; the method disclosed by the invention is economical and environment-friendly; the utilization rate of raw materials is improved; and the industrialization cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphene functional materials, in particular to a water-phase graphene dispersion, in particular to a method for preparing a high-concentration water-phase graphene dispersion by ultrasonic stripping. Background technique [0002] Graphene is a two-dimensional carbon nanomaterial composed of a layer of carbon atoms. It is the thinnest known two-dimensional material, with a thickness of only 0.34nm. Graphene has unique properties in terms of mechanics, electricity, and heat, and has set off the third research boom on carbon materials after fullerenes and carbon nanotubes worldwide. [0003] At present, the preparation methods of graphene include mechanical exfoliation method, chemical vapor deposition method, epitaxial growth method, redox method, ultrasonic exfoliation method and so on. Among them, the quality of graphene prepared by mechanical exfoliation method is the highest, but its yi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19C01B32/194
Inventor 邱学青祝都明楼宏铭杨东杰
Owner SOUTH CHINA UNIV OF TECH
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