M. Wesam Al-Mufti

Studying Effect Dimensions of Design and Simulation Silicon Nanowire Filed Effect Biosensor

We investigated into report a study biosensor based on silicon into an effect on the dimensions of conductance design and simulation nanowire surface with molecular DNA for sensitivity. In the design nanowire of A biosensor with 3 layers starting with polyisilicon nanowire of radius 8 NM surrounded by a 50-nm electrode layer, and the substrate by a 300nm. COMSOL Multiphysics software used to provide interaction with molecules such as DNA and the distribution of the electrostatic potential in the narrower due to the dimensions, surface nanowire charge was computed using Poisson equation with Boltzmann statistics. In the result of the effect geometry was also studied and the different dimension yield different space charge and the surface charge at interactive site were also investigated and the study demonstrate steps wise identification of all critical parameters for (DNA) attachment with surface nanowires.

The State of the Arts: Simulation of Nanostructures Using COMSOL Multiphysics

Currently, Computer simulation has become an essential part of nanotechnology and engineering and science. Digital analysis of components, in particular, is important when developing new products or optimizing designs. Today a broad spectrum of options for simulation is available; researchers use everything from basic programming languages to various high-level packages implementing advanced methods. Though each of these techniques has its own unique attributes, they all share a common concern. Hence, the paper present a COMSOL simulation on nanostructures, the past and recent development nanostructures design and simulation for nanogap, nonporous, nanowires and carbon Nanotube. Keywords; Nanostructures. COMSOL Multiphysics, Nanowire, Nanogap, Nanotechnology.

Current Trend in Simulation: A Study Simulation of Poly-Silicon Nanowire Using COMSOL Multiphysics

Poly-Silicon nanowire (Poly-Si-NW) simulations are very important field of nanotechnology and nanostructures; in this paper presented review in general nanowire and it applications such as thermoelectric device (TED) has potential applications in areas such as chip level cooling/ energy harvesting and many more applications in this field .COMSOL multiphysics is one of programmers using for nanotechnology and nanowires simulation, hence in this review paper, COMSOL simulation with different types of materials using for nanowire and other structures. Also In this work, we explore the effect of the electrical contact resistance on the performance of a TED. COMSOL simulations are performed on Poly-SiNW to investigate such effects on its cooling performance. Intrinsically, Poly-SiNW individually without the unwanted parasitic effect has excellent cooling power density. However, the cooling effect is undermined with the contribution of the electrical contact resistance.

Design and Fabrication of PDMS Microchamber for Fast Reaction Assays in Biosensing Application

A simple design of a microchamber for use in reacting assays with limited sample availability has been proposed, analyzed using COMSOL 3.5 Multiphysics simulation and fabricated using soft-lithography technique . The design is based on differential pressure drop flow using capillary effect concept which has facilitated a number of interesting flow phenomena in micro-domains. For an average pressure drop of about 100/m in the setup, flow rates of bout 0.5 to 0.8 μl/s were obtained. The component a microchamber, three designs were tested (50, 70, 90 microns in width) to give a continuous open circuit flow. The system was designed and fabricated for continuous flow across sensing element where there is a requirement for low residence time due to fast reaction/diffusion rates.Also in this paper, is a sensitive and selective, also rapid, reliable, cost-effective, and suitable for in situ analysis polymer biosensor for new bio molecular approach for cancer and cancer related diseases detection at the early stage is demonstrated.

Formation of polysilicon nanowires as transducer for biosensor using plasma trimming process

Research on nanowire structures, behavior and material properties are very wide present day. Beside those matters, techniques and methods are using to produces nanowire also are still in studies in order to escalate the formations of nanowire. Nanowire applications are widely use and it mostly for electronic devices that involve with nanometer scale features, measures and detections or sensors. This study will explore previous works and expose the formation of nanowires using different material and process or technique which are polysilicon as material and dry etching processfor reasons to reduce cost, improving the structures and process in order to get good profile and structures that same with the other processes and materials that seem very costly and complicated. Plus this project also elaborate the important things that related with nanowires such as structure sizes, fabrication technique will be used and applications involve.

Estimating of Cherenkov Radiation in Extensive Air Showers Using CORSIKA Code for Tunka133 EAS Cherenkov Array

The simulation of Cherenkov light Lateral distribution function (LDF) in Extensive Air Showers (EAS) initiated primary particles such as primary calcium, argon, proton iron nuclei, neutron and nitrogen have been performed using CORSIKA program for conditions and configurations of Tunka133 EAS Cherenkov array. The simulation was fulfilled at the high energy range 1014-1016 eV for four different zenith angles 0o, 10o, 15o and 30o. The results of the simulated Cherenkov light LDF are compared with the measurements of Tunka133 EAS array for the same particles and energy range mentioned above. This comparison may give the good ability to reconstruct the energy spectrum and mass composition of the primary cosmic ray particles in EAS. The main feature of the given approach consists of the possibility to make a library of Cherenkov light LDF samples which could be utilized for analysis of real events which can be detected with different EAS arrays and reconstruction of the primary cosmic rays energy spectrum and mass composition of EAS particles.

Analysis of Capillary Filling in Micro Channels for Passive Fluid Dynamics in Nano Lab on Chip Domain

A fluid dynamics in a micro channel for analytical chemistry and different aspects of this type of flow for specific application has remained a long-acting problem in the last two decades considering its numerus applications in various fields, thus, Surface tension and wall adhesive forces are often used to transport fluid through micro channels in Micro Electromechanical system devices or to measure the transport and position of small amounts of fluid using micropipettes. Here we took the advantages of wall adhesion and surface tension at the air/fluid interface, fluid rises through the channel and study also calculate the velocity, pressure and shape and position of the fluid surface, the model consist of a capillary channel of radius 50μm and a chamber. The study demonstrated that the fluid freely flown into the chamber 2mm/s without using any external mechanism.

Low cost fabrication of micromixer and microchamber for microfluidic lab-on-chip

Microfluidic technology has been given the contribution in biomedical and chemistry. The testing and diagnosis on bio-reagents has the efficiency increased through the implementation of microfluidic technology, such as lab on chip device. This biochip device is designed to run testing for biochemical testing fluids like genomic, proteomic and pharmaceutical tests. Upon injection, the automation for the testing and diagnosis is enabled through this device. Polydimethylsiloxane (PDMS) is the main material for this device. This paper briefs the introduction of lab on chip device and its advantages and recites the microfabrication and characterization of microfluidic lab on chip product for the application of micromixer and microchamber.