بررسی رفتار نوسانی نانوذرات نقره و طلا درون نانولوله های لیپیدی

This research investigates the oscillatory behavior of metallic nanoparticles, specifically silver and gold nanoparticles, inside lipid nanotubes (LNTs) utilizing the continuum approximation and the 6-12 Lennard-Jones (LJ) potential function. The nanoparticle is represented as a dense sphere, and the LNT is considered to have six layers: two head groups, two intermediate layers, and two tail groups. In order to determine the van der Waals (vdW) interactions between the two interacting nanostructures, analytical expressions are derived by undertaking surface and volume integrals. Ignoring the frictional forces and utilizing the Runge-Kutta numerical integration scheme, the equation of motion is directly solved to attain the time histories of displacement and velocity of silver and gold nanoparticles inside LNTs. Based on the conservation of mechanical energy principle, a new oscillation frequency formula is also derived to precisely evaluate the frequencies of the proposed nano-oscillator. The effects of initial conditions and geometrical parameters on the oscillatory behavior of system are examined. Numerical results indicate that silver nanoparticle generates higher frequencies inside LNTs compared to gold nanoparticle. It is further found that the tail group thickness has a smaller effect on the oscillation frequency than the head group thickness.