The Preparation And Application Of Carbon Nanotube Dispersion Liquid

With the development of nanotechnology, the carbon nanotube(CNT) has been drawn much attention as its excellent electrical, thermal, magnetic and other properties. However, its application is limited because the conventional CNT is difficult to dissolve in various solvents. This topic puts forward a new method for preparation of carbon nanotube. The CNT prepared by this method is a linear, no entangled, good one-dimensional material with diameter between 40-100 nm, inner diameter of about 4nm and the ratio of about 20:1. It can be concluded that the internal structure of CNT is composed like numbers of graphite layers rolled into a circle. The environmental scanning electron microscopy and transmission electron microscopy were used to detect the data.Much study about the dispersion of CNT had been processed, Such as the different types of dispersion dispersant, the content of dispersion or CNT. The results showed that the aqueous dedicated nanomaterials dispersant had better dispersion than sodium lauryl sulfate when dispersing carbon nanotubes into aqueous system. with the increasing of milling time, the resistance value of the dispersion liquid-dropping samples was not putting up much particular improvement, indicating that the milling time had little effect on improving the resistance. However, the effect of dispersing CNT was explored about the different content of dispersant in the ethanol system. From the study, it could be found that, with the increasing of the dispersant content, the resistance increased too, and there emerged a best value when the milling time was 24 h., In the NMP system, it was clearly that the CNT content and the resistance value exited a direct ratio relation, which could be explained by the good electrical conductivity of carbon nanotubes.Modified carbon nanotubes could be obtained through the procession of acidification or amine modification, Dispersion effect was compared with the normal CNT and the modified CNT. the results showed that the acidized CNT had the best dispersion for 25 d no sediment. The conclusion could be made that the acidized CNT was well to keep the original shape of carbon nanotubes with almost no damage to CNT. However, the structural of CNT was largely destroyed when it comes to amine modification.The CNT conductive paper was made by mixing the pulp with CNT dispersion. The results showed that a conductive network can be formed very well in the CNT conductive paper, which could decrease the resistance and increase the shielding effect. The discharge capacity of battery can be improved by 50.56% when the carbon nanotubes conductive paper has taken the place of graphite as the cathode current collector. it was better when the modified CNT conductive paper used.The adsorption of CNT- pentachlorophenol was also investigated aiming to settle the environmental problem. When the concentration of pentachlorophenol was from 0.386mg/L to 4.045mg/L, it presented a good linear relationship which the correlation r2 was 0.999 at the wavelength 217 nm. The adsorption carbon nanotubes to pentachlorophenol followed the rules of Freundlich isotherm model well, when the initial concentration increased, the dispersibility increased; but decreased when the temperature rised.