Estimation of the dimension of micropores and mesopores in single walled carbon nanotubes using the method Horvath-Kawazoe, Saito and Foley and BJH equations

The adsorption isotherm of the single walled carbon nanotubes (CNTs) is measured. The mathematical models for calculating pore size distribution (PSD) are modified. The PSD of sample is determined using Horvath-Kawazoe (KH), Saito and Foley (SF) and Barrett-Joyner- Halenda (BJH) methods. An average potential function has been determined inside the slit-like and cylindrical pores. Since all of the regions of CNTs have same type that adsorbed nitrogen in the same conditions, the calculated PSDs from HK, SF and BJH models have same trend in both interior and exterior surfaces. By adding the adsorption term on outer surface, HK, SF and BJH models have been developed hence the pore volume increased.