چكيده به لاتين
Applying the correct controlled force to the nanoparticle in the manipulation process prevents damage and degradation. So, in this research, it has been tried to apply a control force using the control and dynamics rules of simple and porous elliptical nanoparticles. The results for the dynamics section indicate when the nanoparticles begin to slip and rotate. Also for a particular type of particle, first, the roll occurs on the substrate or the slip occurs on the substrate. For elliptical nanoparticles, something else happens, and it's that the particle is first rolling on the surface, and then the slip begins. For porous elliptical nanoparticles, with increasing porosity coefficient, a slip occurs initially. As the porosity increases, the gap between the forces needed to change the slip to its rotation also rises. It is due to the fact that the drag force, surface adhesion and roughness increase on the surface, and this causes the rolling occurs much later than the slip. In addition, for the controller, their value ranges from 0.1 seconds earlier to the desired value. Also, the mechanical properties of amorphous ceramic granular alumina γ were taken using nanoindentation and nanoscratch tests to evaluate their resistance and stability. The elasticity modulus and hardness of granular alumina γ was estimated using a nanoindentation method under different forces. The results showed that this material is highly porous and includes a lot of porosity. The results also indicate that the modulus of elasticity and hardness does not go through a particular process with rising indenter force. It means these features increase or decrease in a certain range. The modulus of elasticity and hardness of this material were calculated 12.6 GPa and 0.433 GPa, respectively. In addition, the plasticity index for this granular alumina has also been investigated, indicating that this material is highly plastic, with a plasticity index of 0.83. In the end, to obtain the scratch resistance of this granular material, a nanoscratch test was performed on two different forces. The results show that with increasing the indenter force, the scratch resistance also growths.
