Highly dispersed highly stable high concentration and high yield graphene dispersion liquid and preparation method thereof

Abstract

The present invention provides a highly dispersed highly stable high concentration and high yield graphene dispersion liquid and a preparation method thereof, and relates to the preparation method of the graphene dispersion liquid. The graphene dispersion liquid concentration is 1mg / mL-60mg / mL, and the graphene dispersion liquid comprises 0 to 6% (by weight) of a dispersant; the graphene diameter is 100-6000nm; the graphene yield is 40 %-99%; and the preparation method is a mechanical grinding technique based on a ball or a rod or a segment as a media. The graphene dispersion liquid solves the poor dispersibility, low stability, low concentration, low yield and other problems of the graphene in water and other various organic solvents, and the graphene dispersion liquid is a black viscous slurry, good in dispersion, has good stability, high dispersion concentration, and high production yield.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a graphene dispersion liquid with high dispersion, high stability, high concentration and high yield, and a method for preparing the graphene dispersion liquid with a grinding device using balls, rods or segments as media. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, successfully separated graphene from graphite in experiments, and confirmed that it can exist alone. "The groundbreaking experiment of two-dimensional graphene materials", jointly won the 2010 Nobel Prize in Physics, which kicked off the prelude to the preparation of graphene. Graphene is another important carbon material after fullerene and carbon nanotubes. Graphene is a honeycomb-shaped hexagonal two-dimensional crystal formed by a single layer of carbon atoms arranged in the form of sp 2 Hybridizat...

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Problems solved by technology

For example, researchers such as J. N. Coleman (U. Khan, A. O'Neill, M. Lotya, S. De, J. N. Coleman, Small, 6, 864-871.) dispersed flake graphite into the solvent NMP, and used ultrasonic After ultrasonication for 460 h, the concentration of graphene obtained was 3.3 mg·L -1 .The concentration of the graphene dispersion obtained by this method is low, and the ultrasonic time is long, which seriously limits industrial production and demand

Dispersed and reduced graphene oxide, researchers such as Dan Li (Dan Li, Marc B. Müller, Scott Gilje, Richard B. Kaner, Gordon G. Wallace. Nature Nanotechnology, 2008, 3, 101-105.) will graphene oxide aqueous solution Use a certain amount of hydrazine hydrate and ammonia solution to reduce at 95°C for 1 hour, and the obtained concentration is 0.5 mg L -1 Graphene dispersion liquid, the graphene dispersion liquid concentration that this method obtains is low and stability is very poor, can't meet the various needs of industry

In addition, the preparation of the existing graphene dispersion mainly uses graphene as the raw material, and the graphene is dispersed in the solvent, so the preparation cost of the graphene dispersion is relatively high, which restricts the industrialization process of graphene

In addition, due to the aggregation of graphene sheets, the graphene sheets in the existing commercialized graphene dispersions are multilayer structures, and it is difficult to obtain oligolayer graphene dispersions.

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