Research Information System
International Conference on Advances in Engineering, Architecture, Science and Technology, Erzurum, Turkey, 15 - 17 December 2021, pp.669-670, (Summary Text)
In nanotechnology, nanorods can be defined as one of the nanoscale structural elements having dimension interval from 1-100 nm. Nanorods may be produced based on direct chemical synthesis from metals or semiconducting materials (Hamzan et al., 2021). Nanorods have higher length when compared to their thickness which leads to get aspect ratios greater than one. Nanorods are future promising materials and they can be utilized in display technology and microelectromechanical systems (MEMS) (Ghodssi and Lin, 2011). Zinc oxide (ZnO) nanorods are widely used in the production of electronic nanodevices, such as ultrabright light emitting diode (LED) (Yi et al., 2005). Thus, mechanical and wave propagation properties of nanorods are significant. This study investigates the wave dispersion characteristics of nanorods possessing uniform porosity distribution. Wave propagation problem is derived according to the Eringen’s nonlocal elasticity theory (Eringen and Edelen, 1972; Eringen, 1972; Eringen, 1983) and nonlocal stress gradient model is considered. Nanorod has even porosity distribution which provides uniform pores along the rod. Wave dispersion equation is solved, and wave number-wave frequency relation is obtained to examine the influences of small-scale coefficient and volume fraction of porosity. Wave characteristics of nanorod is acquired based on the Born-Karman model of Lattice Dynamics. Results obtained using classical (local) rod model, nonlocal rod model and Born-Karman model of Lattice Dynamics are compared. For classical (local) model, the wave numbers for the axial mode has a linear variation with the frequency which is in the terahertz (THz) range. While uniform porosity has no effect on wave dispersion at classical (local) theory, it becomes effective at nonlocal theory. The linear variation of the wave numbers at classical (local) theory denote that waves will propagate non-dispersively, i.e. the waves do not change their shapes as they propagate (Narendar, 2011). However, wave dispersion characteristics become nonlinear and quite different from that obtained at classical (local) rod model for larger values of small-scale coefficient, which implies the significance of the nonlocal theory in the examination of wave characteristics of porous nanorods.