Method for improving dispersibility of single-walled carbon nanotube in aqueous solution

Abstract

The invention belongs to the field of materials chemistry and in particular relates to a method for improving the dispersibility of a single-walled carbon nanotube in aqueous solution. The method comprises the following detailed steps of: dispersing a single-walled carbon nanotube purification sample in the aqueous solution of ethanol, and performing ultrasonic dispersion on the sample to uniformly suspense the sample in the solution; quickly cooling the obtained solution by using liquid nitrogen as a cooling medium and continuously supplying the cooling medium to guarantee that the cooling temperature of the sample reaches -50 to -190 DEG C; at normal temperature and under normal pressure, placing the solid sample in a closed device in which a high-speed blade rotates, wherein the rotation speed is 22,500rpm, the rotation time is 1 minute and the crushing process is repeated for 1 to 7 times; and filtering and drying the obtained sample to obtain the single-walled carbon nanotube aqueous solution with relatively good water solubility finally. In the invention, a physical method is adopted at normal temperature and under normal pressure, so that the structure of the single-walled carbon nanotube in aqueous solution is not damaged in a treatment process; the ethanol serving as a raw material is simple and available and causes no pollution to environment; and the method has the advantages of simple process and easy processing, so that the method is suitable for commercial production.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a method for improving the dispersibility of single-walled carbon nanotubes in aqueous solution. Background technique [0002] In recent years, with the continuous development of single-walled carbon nanotube (SWCNT) preparation technology, large-scale and large-scale production of single-walled carbon nanotubes has become possible. It provides the possibility for its large-scale application. At present, the obstacles restricting the application of single-wall carbon nanotube devices and single-wall carbon nanotube composite materials are their dispersion and compatibility with matrix materials. Single-walled carbon nanotubes have few surface defects, lack active groups, and have low solubility in various solvents. Due to the strong van der Waals force between single-walled carbon nanotubes and the huge specific surface area and high aspect ratio of single-walled c...

AI Technical Summary

Problems solved by technology

The method of surfactant modification will not destroy the structure of carbon tubes, but because of the surfactant attached to the surface, there is a problem of introducing new substances and removing them again, which will also have many adverse effects on the later application of SWCNT.