Studies of adsorption and total heterogeneity properties of pure and modified carbon nanotube surfaces

Modified carbon multiwall nanotubes were prepared via the oxidation process by means of 65 % nitric acid and/or ferric nitrate dissolved with 65 % nitric acid. Using special thermogravimetry (Q-TG), sorptometry, and AFM methods physicochemical properties of pure and modified nanotube surfaces were investigated. A numerical and analytical procedure for the evaluation of total heterogeneous properties on the basis of liquid thermodesorption from the sample surfaces under the quasi-equilibrium conditions is presented. The calculations of the fractal dimensions of carbon nanotubes using the thermogravimetry Q-TG, sorptometry, and AFM data are presented.