Preparation method for small-size graphene

A graphene, small-scale technology, applied in the field of small-scale graphene preparation, can solve the problems of large graphene defects, high preparation cost, low performance, etc., and achieve the effects of short preparation time, high monolayer ratio, and easy operation.

Active Publication Date: 2014-08-27
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are great difficulties in the preparation and separation of small-sized graphene. The preparation methods mainly include methods such as chemical tailoring, mechanical grinding, and high-speed centrifugation. Low (especially electrical properties), low yield, high preparation cost

Method used

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  • Preparation method for small-size graphene
  • Preparation method for small-size graphene
  • Preparation method for small-size graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1, using this method to prepare small-sized graphene in a mixed solvent of 30% by volume isopropanol and water is an example. The small-gap stator-rotor device of the stator-rotor mixer used to generate high-speed rotating fluid is shown in Figure 2(a). The specific process steps are as follows:

[0042] Step 1: take by weighing the flake graphite powder 3.5g that particle diameter is less than 100 microns, be dispersed in the mixed solvent of 30% volume ratio isopropanol and water of 700mL, obtain the graphite dispersion that concentration is 5mg / ml;

[0043]Step 2: Put the prepared graphite dispersion into a cylindrical tank with a diameter of 10 cm, and put the stator-rotor device of the stator-rotor mixer into the center below the liquid surface of the solution;

[0044] Step 3: Turn on the circulating cooling water system to keep the graphite dispersion in the container at a room temperature of about 25°C; use this method to treat the graphite dispersion fo...

Embodiment 2

[0047] Embodiment 2, in the mixed solution of water and ethanol, utilize this method to prepare small-sized graphene as embodiment, be used to produce the stator-rotor device real object of the large-gap stator-rotor mixer of high-speed rotating fluid as shown in Figure 2 (b) As shown, Figure 3(a) and (b) are the cross-sectional view of the internal structure and schematic diagram of the force of the stator-rotor mixer used to generate high-rotation fluid in Embodiment 2.

[0048] The specific process steps are as follows:

[0049] Step 1: Configure 700mL of mixed solution of water and ethanol, the mass fraction of ethanol is 40%, and the rest is deionized water, and 7g of flake graphite powder with a particle size of less than 100 microns is dispersed in it to obtain a graphite dispersion with a concentration of 5mg / ml ,

[0050] Step 2: Transfer the prepared graphite dispersion to a cylindrical tank with a diameter of 9.5 cm, and fix the stator and rotor device at the cente...

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Abstract

A disclosed preparation method for small-size graphene comprises the steps: step 1, mixing a graphite powder raw material and a solvent to obtain a graphite mixed solution; step 2, putting the solution in a container, and fixedly arranging a homogenizing head of a stator-rotor apparatus of a stator-rotor mixer below the liquid level; step 3, starting a cooling system and the stator-rotor mixer for processing; and step 4, performing standing processing or centrifugation separation on the prepared solution to remove incompletely-peeled particles, and collecting the supernatant to obtain a stable dispersion solution of small-size graphene. According to the preparation method, a rotor rotating with a high speed drives a fluid to have a high-speed motion, so that high velocity gradient and high shear force are generated, and also graphite sheets are subjected to peeling and refining because the high-speed fluid bumps bosses of a hole wall of a stator, and the prepared graphene is small in dimension, concentrated in distribution and high in single-layer ratio. The method has the characteristics of small equipment investment, low raw material cost, simple, easy and practicable operation and impressive output, and is suitable for large-scale industrialized production as well as laboratory research.

Description

technical field [0001] The invention relates to a method for preparing small-sized graphene, in particular to a technology for preparing graphene in a solution using fluid dynamics generated by a high-speed rotating rotor, and belongs to the technical field of graphene preparation. Background technique [0002] Since Novselove and Geim won the 2010 Nobel Prize in Physics, graphene materials have achieved unprecedented development. Because of their unique and excellent properties in physics, chemistry, electricity, mechanics, etc. Electronics and other fields have shown great application prospects. However, the most important prerequisite for the large-scale application of graphene is to develop a low-cost, large-scale, and pollution-free graphene preparation technology. Similarly, the large-scale, low-cost, and pollution-free preparation technology of graphene is also one of the core issues about the basic research and industrial application of this material. [0003] Novo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04B82Y30/00B82Y40/00C01B32/19
Inventor 沈志刚刘磊张晓静麻树林
Owner BEIHANG UNIV
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