Validity of isothermal equation of states for study the high-pressure compression of carbon nanotubes and some other nanomaterials

To predict the most suitable EOS for analysis of real compression behavior of nanomaterials such as C₆₀ solid, CdSe (5.4 nm), Ni-filled MWCNT, Fe-filled MWCNT, CNT, and δ-Fe nanotubes under isothermal compression. we have used Murnaghan, Tait EOS, based on thermodynamical approximation and the results of the experiment have been compared. The analysis of computed results suggests that Tait and Murnaghan's EOS is in good agreement with the experimental data that is already known, proving the correctness of the formulation used in this study in the entire range of pressure. Surprisingly it is also observed that the Murnaghan formulation gives a better agreement with the experimental result for carbon nanotubes than the Tait formulation. Thus, it is concluded that thewell-known and widely used Murnaghan EOS is still most suitable and valid for bulk as well as nanomaterials.The present study also reveals the fact that the carbon Nanotubes are less compressible than Ni-filled MWCNT, and Fe-filled MWCNT.