We investigated fullerene and metallofullerene nano ball bearings using classical molecular dynamics and steepest descent methods based on both the Tersoff-Brenner and the Lennard-Jones 12-6 potentials. Under hydrostatic pressures, the bulk modulus and the ultimate pressure of K@C_(60) were higher than those of C_(60). While C_(60) rolling dynamics were the same as K@C_(60) rolling dynamics, the sustaining pressure of K@C_(60) intercalated between layers was higher than that of C_(60) intercalated between layers. In molecular dynamics simulations of C_(60) and K@C_(60) rolling motions, periodic variations of the frictional forces were found and the mean dynamical frictional forces were almost zero. We were able to conclude that K@C_(60) was more effective than C_(60) for the application of nano ball bearings.
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