Fig. 4
From: Tuning the Slide-Roll Motion Mode of Carbon Nanotubes via Hydroxyl Groups
a The coordinate of a C atom on carbon nanotube in the z direction as a function of time when the carbon nanotube moves at speeds of 20, 50, and 70 m/s. b The mean friction forces’ curve with the velocities of carbon nanotube. c The coordinate of a C atom on the carbon nanotube in the z direction when the hydroxyl groups’ ratio on carbon nanotube and Si substrate is 5%/10%. The applied constant external force on the carbon nanotube is 0.000625 nN in the x direction