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Uncertainty Modeling in Practical Molecular Communication Transmitters and their Effects on Rate
, M.Sc. Thesis Sharif University of Technology ; Aminzadeh Gohari, Amin (Supervisor) ; Nasiri Kenari, Masoumeh (Co-Advisor)
Abstract
Molecular communication (MC), is a new way of communication among nanomachines.its applications are typically in cases which the conditions of transfer such as size, nature of the medium and nature or type of the original signal, is consistent with molecules such as medicine, health care, industrial and environmental applications.In this thesis, we first review different models of molecular transmitters. In most of them, storage capacity and molecule generation rate are not considered. we try to propose practical transmitter models considering these limitations. for high storage capacity transmitters, we propose Fixed and Linear transmission methods. assuming that channel is without...
Nanocar swarm movement on graphene surfaces
, Article Physical Chemistry Chemical Physics ; Volume 24, Issue 45 , 2022 , Pages 27759-27771 ; 14639076 (ISSN) ; Nejat Pishkenari, H ; Ejtehadi, M. R ; Sharif University of Technology
Royal Society of Chemistry
2022
Abstract
Investigation of nanomachine swarm motion is useful in the design of molecular transportation systems as well as in understanding the assembly process on the surface. Here, we evaluate the motion of the clusters of nanocars on graphene surfaces, using molecular dynamics (MD) simulations. The mechanism of motion of single nanocars is evaluated by considering the rotation of the wheels, direction of the nanocars’ speed and comparing the characteristics of the surface motion of nanocars and similar absorbed molecules. The mentioned analyses reveal that, in the thermally activated surface motion of the nanocars, sliding movements are the dominant mode of motion. A coarse grained (CG) model is...
Design and Fabrication of Tip for a Nanolithography System
, M.Sc. Thesis Sharif University of Technology ; Rashidian, Bijan (Supervisor)
Abstract
Various applications of nanostructures in electronics, optoelectronics, MEMS, photonics and plasmonic make their fabrication an interesting research topic recently. Progress in nanotechnology depends on the capability to fabricate, position and interconnect nanometer-scale structures. The development of fabrication devices with nanoscales is mainly dependent on the existence of a suitable nanolithography approach. Patterning materials with nanoscale features aimed at improving integration and device performance faced several challenges. The limitation of conventional lithography systems including resolution related issues, operational costs and lack of flexibility to pattern organic and...
Graphene jet nanomotors in remote controllable self-Propulsion swimmers in pure water
, Article Nano Letters ; Volume 16, Issue 9 , 2016 , Pages 5619-5630 ; 15306984 (ISSN) ; Saadati, M ; Jannesari, M ; Sharif University of Technology
American Chemical Society
Abstract
A remote controllable working graphite nanostructured swimmer based on a graphene jet nanomotor has been demonstrated for the first time. Graphite particles with pyramidal-like morphologies were fabricated by the creation of suitable defects in wide high-purity graphite flakes followed by a severe sonication. The particles were able to be self-exfoliated in water after Na intercalation between the graphene constituents. The self-exfoliation resulted in jet ejection of graphene flakes from the end of the swimmers (with speeds as high as ∼7000 m/s), producing a driving force (at least ∼0.7 L (pN) where L (μm) is swimmer size) and consequently the motion of the swimmer (with average speed of...
Rectilinear motion of carbon nanotube on gold surface
, Article International Journal of Mechanical Sciences ; Volume 217 , 2022 ; 00207403 (ISSN) ; Youzi, M ; Vaezi, M ; Nejat Pishkenari, H ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
For many years, it has been a significant concern for nanoscience researchers to synthesize nanomachines with steerable motion. Despite the notable number of studies on the motion of nanocars on a surface, the motion characteristics of carbon nanotubes received less attention. Remarkable features such as symmetry, strength, and stiffness made carbon nanotubes (CNTs) a proper option as wheels in the nanocars. In this paper, for the first time, the motion of carbon nanotube on a gold substrate and its advantages over previous wheels such as fullerene and p-carborane are investigated. We demonstrate that contrary to the other wheels, CNT moves in a directed path, making them an ideal option as...