Showing 5 results for Nanomanipulation
Moein Taheri,
Volume 15, Issue 12 (2-2016)
Abstract
In nanomanipulation using atomic force microscopy, for the displacement of various micro/nanoparticles, calculation of accurate critical force and time of manipulation in order to not damage and precise manipulation of micro/nanoparticles, is necessary. To achieve this goal requires accurate modeling of kinematics and dynamics of a two-dimensional nanomanipulation that already has been done. In this paper, three-dimensional nanomanipulation modeling and simulation dynamic has been done for more simulation results closer to the results of real nanomanipulation. For this purpose, by taking a spherical shape for micro/nanoparticle, three-dimensional kinematic relations manipulation extracted. Then, JKR contact model for use in manipulation provided and rectangular beam stiffness equations derived in three dimensions. In the final stage of the modeling of the dynamics of the three-dimensional micro/nanoparticles to extract force equations and critical time manipulation obtained. Then the equations obtained by simulation, three-dimensional manipulation amount of force and critical time for both DNA and platelets biological particle is calculated. The results indicate start rolling motion of the particles studied before rolling around on the x-axis and y axis and z as well as the critical need for displacement of particles of the platelet-derived DNA.
Moharam Habibnejad Korayem, Amin Habibnejad Korayem, Moein Taheri, Saeed Rafee Nekoo,
Volume 16, Issue 11 (1-2017)
Abstract
Nowadays, movement of micro/nano particles has been attracted considerable attention to manufacturing different devices in micro/nano scale and medical and biological applications. Atomic Force Microscope Probe is widely being used for precise small scale movements. During nano-manipulation, micro/nano particles can be moved to a desired destination with high accuracy using Atomic Force Microscope while in contact mode with precise probe control. In this article, by selecting a proper amount of torque applied to the probe tip, deviation from the center and movement of probe have been investigated to assure the contact between the probe and micro/nano particle. Different liquid environments (water, alcohol, and plasma) with different micro/nano particles including biological and non-biological have been used for this investigation. In addition, using sliding mode control, Atomic Force Microscope Probe was used in different environments such as water, alcohol, and plasma. Obtained results showed that the time needed to control different micro/nano particles in plasma was shorter than that of in water; also the time needed in water was shorter than that of in alcohol.
Moharam Habibnejad Korayem, Mohsen Estaji, Ahmad Homayooni,
Volume 17, Issue 3 (5-2017)
Abstract
To investigate the effects of drugs on viruses, interactions between proteins and inserting desirable genetic changes on DNA, precise study of biological cells is a necessary demand for nowadays. In this way, exploring mechanical properties of these particles and their mechanical behavior in different situations is needed; manipulation of bioparticles in nano scale is an important process for investigating nanoparticles behavior; because the amount of exerted force, deformation and investigating the damage possibility can provide useful information. In this paper, a molecular dynamics modeling of bioparticles nanomanipulation based on AFM has been done. Bioparticles include virus, protein and ssDNA. The main goal of this study is investigating the substrate effect on exerted force on the bioparticles and exploring damage possibility. Three types of substrates have been used, including silicon, graphene sheet and golden substrate. Widespread usage and low level interactions with other materials are the reasons of choosing these substrates. Results show that on gold substrate, the maximum manipulation force occurs and damage possibility is high. Also on graphene substrate manipulation force and deformation of particle are more than the silicon substrate.
M. Taheri,
Volume 19, Issue 1 (1-2019)
Abstract
Critical force and time are the two important output parameters in nanomanipulation of different particles. Various input parameters affect the critical force and time, among which dimensional parameters and velocity can be considered the most important ones. To accurately calculate the critical forces and time of the manipulation requires careful analysis of the effect of various input parameters. One of the new methods in affecting the sensitivity analysis of input parameters on problems are statistical sensitivity analysis methods, one of the most accurate methods of which is the Sobol method. Previously, research on the influence of various parameters on the 2D manipulation has been done. In this paper, for the first time, using Sobol statistical sensitivity analysis method, effects of various dimensional parameters, including length of cantilever, width of cantilever, thickness of cantilever, height of tip, the speed in direction of the x and y-axes, radius of the particle, radius of the tip needle, and length of particle have been studied on 8 output parameters, including critical force of sliding along the x-axis, rolling around the x-axis, sliding along the y-axis, rolling around the y-axis, and critical time of sliding along the x-axis, rolling around the x-axis, sliding along the y-axis, and rolling around the y-axis in 3D manipulation. The final obtained results demonstrate that “cantilever thickness” and “cantilever length” are the most influential parameters on critical forces, and “tip height” and “cantilever thickness” are the most influential ones on critical times.
B. Zarei , S.h. Bathaee , M. Taheri, M. Momeni ,
Volume 19, Issue 1 (1-2019)
Abstract
Nanotechnology deals with objects and materials in nanometer scale and it is being expanded in the field of materials tools and systems. Nowadays, human knowledge in nanotechnology is going through a commercializing path in order to provide more services. Living creatures are built of cells with 10 μm size. Some nanoparticles application in biology and medicine include drug and gene delivery, tissue engineering, and tumor destruction with heat. These procedures, which are done with nanoparticles manipulation, have two specific phase in general; in phase one, the amount of critical force and time are calculated based on dimensional and peripheral parameters. Now, it is tried to calculate nanoparticles displacement and velocity during the process in the phase two of nanoparticles manipulation. Also, in this paper, nanoparticles displacement and velocity were investigated in two dimensional space, using three main friction model namely coulomb, Hk, and lugre in phase two of nanoparticles manipulation. According to the results of this project, maximum speed and displacement was obtained, using lugre friction model and the minimum amounts in coulomb model. Also, with particles radius increase, displacement and velocity were reduced; this effect is engendered even without considering friction factor. Correspondingly, considering accuracy and validity, the coulomb model was the least accurate model and lugre was the most accurate one and the HK model was placed between these two models.
