Mechanical properties of multi-walled beryllium-oxide nanotubes: a molecular dynamics simulation study

Area of Science:

• Materials Science
• Nanotechnology
• Computational Physics

Background:

• Beryllium-oxide nanotubes (BeONTs) are novel nanomaterials with potential applications.
• Understanding their mechanical properties is crucial for designing BeONT-based devices.
• Molecular dynamics (MD) simulations offer a powerful tool to investigate nanoscale mechanical behavior.

Purpose of the Study:

• To determine the molecular fingerprint of mechanical properties of BeONTs.
• To investigate the influence of structural parameters (radius, number of walls, interlayer distance) and temperature on BeONT mechanical behavior.
• To analyze Young's modulus, failure stress, and failure strain of BeONTs.

Main Methods:

• Employed molecular dynamics (MD) simulations.
• Varied nanotube radius, number of walls (single-, double-, triple-walled), and interlayer distance.
• Assessed mechanical properties including Young's modulus, failure stress, and failure strain at different temperatures.

Main Results:

• Larger single-walled BeONTs (SWBeONTs) showed decreased Young's modulus in both zigzag and armchair directions.
• The highest Young's modulus was observed for (8,0) zigzag (645.71 GPa) and (4,4) armchair (624.81 GPa) SWBeONTs.
• Armchair structures exhibited higher failure properties than zigzag structures; increasing interlayer distance in double-walled BeONTs (DWBeONTs) slightly reduced Young's modulus.

Conclusions:

• Structural parameters significantly influence the mechanical properties of BeONTs.
• SWBeONTs exhibit size-dependent mechanical responses, with specific configurations showing exceptional stiffness.
• DWBeONTs and TWBeONTs demonstrate distinct mechanical behaviors compared to SWBeONTs, highlighting the importance of wall interactions.