Method for separating single-walled carbon nanotubes of different sizes by utilizing centrifugal speed variation method

Abstract

The invention provides a method for separating single-walled carbon nanotubes (SWCNTs) of different sizes. The method comprises the steps: under the cooperation of ultrasonic wave and a polymer as a dispersion aid matter, dispersing the SWCNTs in an organic solvent, and then centrifuging the SWCNTs to separate small-size SWCNTs / polymer solution from precipitates (large-size SWCNTs / polymer), thereby obtaining a compound solution formed by the small-size SWCNTs; removing excess polymer by using a THF solvent to wash for many times; acidizing the compound by utilizing trifluoroacetic acid to separate the SWCNTs of different sizes; under the neutralization function of Na2CO3 saturated solution, deionized water is utilized to remove generated salt, thereby obtaining the excess polymer and small content of SWCNTs with different sizes and different responsibility. The method for separating the SWCNTs of different sizes has the advantages that operations are simple and convenient, devices are low-cost, low-cost separation of a large number of SWCNTs is easy to achieve, and the method is an effective way for separating the SWCNTs. The accompanying diagrams mainly show dissolution of the polymer in the organic solvent, successful compound of the polymer and the SWCNTs, and a separation situation of the acidized SWCNTs.

Description

technical field [0001] The invention relates to a method for separating single-walled carbon nanotubes of different sizes by changing the centrifugal speed method, which is a method for separating the single-walled carbon nanotubes according to different sizes by modifying the single-walled carbon nanotubes with polymers and using centrifugation and other simple operations. Background technique [0002] Single-walled carbon nanotubes have good electrical properties and excellent properties unmatched by traditional fibers, such as low density, high tensile strength, high elastic modulus, excellent flexibility, good thermal and chemical stability, carbon The excellent performance of nanotubes has aroused the great interest of many chemists, physicists and material scientists all over the world, and set off a wave of research on carbon nanotubes. [0003] In recent years, the technology of separating single-walled carbon nanotubes (SWCNTs) of different sizes by various methods ...

AI Technical Summary

Problems solved by technology

[0003] In recent years, the technology of separating single-walled carbon nanotubes (SWCNTs) of different sizes by various methods has been continuously developed, and has become a research hotspot in the practical application of SWCNTs. However, under the modification conditions of dispersing aids such as polymers, different Therefore, the separation after recombination has become one of the new means to improve the electrochemical performance of SWCNTs.

Images