Method for preparing grapheme dispersion liquid

A graphene dispersion, graphene technology, applied in chemical instruments and methods, dissolution, mixer and other directions, can solve problems such as low efficiency, low dispersion stability, inability to meet experiments and industrial production, etc., to achieve simple operation, dispersion High stability and saving dispersion time

Active Publication Date: 2015-07-15
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The physical dispersion method can break up large graphene aggregates, but due to the "nano effect" of graphene and the force of extrusion in the physical dispersion method, the dispersed small-sized graphene will also be densely bonded Together; the chemical dispersion method can make the flocculent graphene on the surface of the aggregate disconnect and disperse from the aggregate, and the effect on the tightly entangled nanomaterials is almost zero
[0005] In addition, the use of a single method for dispersion has low efficiency and low dispersion stability, which cannot meet the requirements of experiments and industrial production.

Method used

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  • Method for preparing grapheme dispersion liquid
  • Method for preparing grapheme dispersion liquid
  • Method for preparing grapheme dispersion liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 10g of single-layer graphene and 20g of polyvinylpyrrolidone, add them to 1L of N-methylpyrrolidone, and stir thoroughly to obtain a single-layer graphene mixture.

[0026] Turn on the cooling circulating water and set the cooling temperature to 7℃; put the single-layer graphene mixture into the storage tank 3, adjust the speed of the electric stirrer 2 to 2000 rpm, and adjust the speed of the colloidal grinding disc 5 and the high-shear dispersing head 6 At 14000 rpm, a concentrated ultrasonic probe 1 (80 kHz) was added and dispersed for 2 h to obtain a single-layer graphene dispersion.

Embodiment 2

[0028] Take 5 g of few-layer graphene and 10 g of polyvinyl alcohol, add them to 1 L of distilled water, and stir well to obtain a mixed solution of few-layer graphene.

[0029] Turn on the cooling circulating water and set the cooling temperature to 5°C; put the low-layer graphene mixture into the storage tank 3, adjust the speed of the electric stirrer 2 to 100 rpm, and adjust the speed of the colloidal grinding disc 5 and the high-shear dispersion head 6 At 7000 rpm, two concentrated ultrasonic probes 1 (20 kHz, 80 kHz) were added and dispersed for 0.5 h to obtain a few-layer graphene dispersion.

Embodiment 3

[0031] Take 0.2 g of multilayer graphene and 2 g of lauryl polyglycol ether, add them to 2L of absolute ethanol, and stir well to obtain a multilayer graphene mixture.

[0032] Turn on the cooling circulating water and set the cooling temperature to 10°C; put the multilayer graphene mixture into the storage tank 3, adjust the speed of the electric stirrer 2 to 1000 rpm, and adjust the speed of the colloidal grinding disc 5 and the high-shear dispersing head 6 At 100 rpm, a concentrated ultrasonic probe 1 (60 kHz) was added for 12 h dispersion to obtain a multilayer graphene dispersion.

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Abstract

The invention discloses a method for preparing grapheme dispersion liquid. The method comprises the following steps: (1) uniformly mixing grapheme and a dispersant in a solvent to obtain a uniformly mixed solution; and (2) dispersing the uniformly mixed solution by a dispersing device for 0.5-24 hours to obtain the grapheme dispersion liquid, wherein the rotation speeds of a high shearing dispersion head and a colloid grinding disc are regulated to be within 100-14000rpm, the rotation speed of an electric mixer is at 10-2000rpm, an energy-concentration ultrasonic probe is additionally arranged, the ultrasonic frequency is within 20-80kHz and the dispersion temperature is 0-20 DEG C after being regulated by a cooling system. According to the method for preparing the grapheme dispersion liquid, the dispersion time is saved and the production efficiency is improved due to the adoption of multiple dispersion methods and synergic action, the cost is low, the operation is easy, and the method is nontoxic, free of pollution and beneficial for batch production, has high dispersion stability and a bright prospect of large-scale industrial application.

Description

Technical field [0001] The invention belongs to the technical field of graphene materials, and specifically relates to a method for preparing a graphene dispersion. Background technique [0002] Graphene is a kind of sp 2 The hybrid orbitals are composed of a hexagonal honeycomb lattice arrangement and a two-dimensional material with a thickness of only one carbon atom. Graphene thermal conductivity up to 5300W / m . K, higher than carbon nanotubes and diamonds, its electron mobility exceeds 15000cm at room temperature 2 / (V . s), which is higher than carbon nanotubes or silicon crystals, and the resistivity is only about 10 -6 Ω . cm, lower than copper or silver, is the material with the smallest resistivity. Graphene has such excellent physical and chemical properties, and has been gradually used in transparent conductive films, nanoelectronic devices, conductive inks, solar cells, lithium batteries, supercapacitors, sensors, and biomedicine. [0003] Graphene dispersion metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/10B01F15/06C01B31/04
Inventor 王卓陈欣董贺存易江平赵成龙王瑛李华锋李廷锋
Owner SHANDONG YUHUANG NEW ENERGY TECH
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