High-solubility multi-fold dry-state graphene oxide microsphere and preparation method thereof

Abstract

The invention discloses a high-solubility multi-fold dry-state graphene oxide microsphere and a preparation method thereof. According to the dry-state graphene oxide microsphere, firstly graphene oxide dispersion liquid is prepared through an organic solvent dilution Hummers method, and then atomized drying is performed so that the dry-state graphene oxide microsphere can be obtained. The dry-state graphene oxide microsphere obtained through the preparation method is good in solubility, the solubility in water and common organic solvents is 20-30 mg / g, and the dry-state graphene oxide microsphere can be stably dispersed for a long time in the mode of a single-layer graphene oxide sheet; good solubility can still be kept after the dry-state graphene oxide microsphere is compressed into high-density blocks; the preparation method is simple, convenient and fast, low in energy consumption and suitable for large-scale industrial production. The problem that the solubility of graphene oxide obtained through an existing drying method is poor is solved, transportation, storage and use of the dry-state graphene oxide microsphere are facilitated because of high density, the dry-state graphene oxide microsphere can be used in the fields of graphene macroscopic assembly materials, functional graphene materials, graphene composite materials and the like.

Description

technical field [0001] The invention belongs to the field of graphene materials, and relates to a highly soluble multi-fold dry graphene oxide microsphere and a preparation method thereof. Background technique [0002] As a new type of two-dimensional carbon material, graphene has attracted more and more attention from the world. Due to its outstanding mechanical properties, electrical properties, thermal properties and unique electromagnetic properties, graphene has shown broad application prospects in many fields and has gradually moved towards practical applications. The preparation of graphene oxide by chemical oxidation is the most common route for large-scale preparation of graphene materials. Because of the rich carboxyl, hydroxyl, epoxy and other polar functional groups on the surface, graphene oxide can be dispersed in a single layer in many solvents, and can form a liquid crystal texture, which can be assembled into fibers, films, and aerogels. And other macrosco...

AI Technical Summary

Problems solved by technology

However, the solubility of the dry graphene oxide obtained by the existing drying method is very poor, which is reflected in two aspects: one is that the dispersibility itself is not good, and it will precipitate in a short time; Layers exist

These two points seriously affect the performance and processability of graphene oxide itself, hindering its industrialization and commercialization

Patent 201010593157.1 "A Method for Preparing Graphene Powder" uses the method of spray drying first and then heat treatment to obtain graphene powder, which mentions that the graphene oxide powder obtained by spray drying can be uniformly dispersed in water, but it is not oxidized Whether graphene exists in the form of a single layer, and the issue of dispersion stability

The air inlet temperature of spray drying in this patent is at 150-250 ℃, and recent studies have shown that the graphene oxide powder obtained by spray drying at this temperature will not form a monolayer structure in water (D.Parviz, M.J.Green, Small, 2015,11, no.22), indicating that this graphene oxide powder cannot be truly dispersed into a graphene oxide dispersion

[0004] In summary, the preparation of soluble dry graphene oxide is an important prerequisite for the large-scale application of graphene, but the dry graphene oxide obtained by the prior art is difficult to disperse to obtain a monolayer graphene oxide aqueous dispersion

Images