Table 11: Numerical comparison among [31] and CDM and the first three frequencies of vibrations of DWCNTs are reported (for and ).

Mode
[31]CDM[31]CDM

14 0.86780.9970.71030.866
1.78072.3811.17641.726
2.70464.0461.72322.583

18 0.54710.6040.43280.524
1.09661.4590.72061.045
1.67722.4531.09361.563

24 0.31710.3400.24460.295
0.62470.8220.40890.588
0.96061.3820.63790.879

28 0.23550.2500.18000.2168
0.46100.6040.30130.432
0.71031.0160.47490.647