Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Polymer Nanowire based Impedance Biosensor

N. Das[1], C. R. Chaudhuri[1]
[1]Department of Electronics and Telecommunication, BESUS, Howrah, West Bengal, India

In this paper, we have proposed an impedance biosensor based on polymer nanowire (made of polyaniline) for efficient electric field mediated capture of biomolecules. Existing polymer nanowire based biosensors fail to achieve high sensitivity for low surface to volume ratio as the whole length of the nanowire is exposed to the analyte .Also biosensors are dependent on diffusion mediated capture ...

Simple Finite Element Model of the Topografiner - new

H. Cabrera[1], D. A. Zanin[1], L. G. De Pietro[1], A. Vindigni[1], U. Ramsperger[1], D. Pescia[1]
[1]Laboratory for Solid State Physics, ETH Zürich, Zürich, Switzerland

In our recent experiments we are revisiting the topografiner technology for the imaging of surface topography with a resolution of a few nanometers. In these new technique called Near-Field Emission Scanning Electron Microscopy (NFESEM), low-energy electrons are emitted from a polycrystalline tungsten tip via electric-field assisted tunneling. In order to characterize and improve the ...

Xylophone Bar Magnetometry and Inertial-grade MEMS Optimisation: a Multiphysics Approach

H. T. D. Grigg, and B. J. Gallacher
Microsystems Group
Newcastle University
Newcastle upon Tyne
Tyne and Wear, UK

This paper presents ongoing research aimed at development of a MEMS magnetometer capable of nanoTesla sensitivity. Such a device would pave the way for inertial-grade MEMS IMUs. A resonant sensor is proposed, based on a Xylophone Bar sense element, and is analysed both directly and via COMSOL. Mode shapes and frequencies are found as functions of geometric parameters, and the results used ...

Ribbon Formation in Twist-Nematic Elastomers

L. Teresi[1], V. Varano[1]
[1]LaMS - Modelling & Simulation Lab, Università degli Studi Roma Tre, Roma, Italy

Nematic Elastomers (NEs) possess both the elastic properties of rubbers and the orientational properties of liquid crystals. Those two properties makes the configuration of NEs very sensitive to isotropic-nematic phase transition. Our goal is to replicate with numerical experiments the phenomena of shape formation in Twist-Nematic Elastomers (TNEs): a flat bar evolves into a helicoidal shape ...

Kinetic Investigation of a Mechanism for Generating Microstructures on Polycrystalline Substrates Using an Electroplating Process

T. Soares[1], H. Mozaffari[2], H. Reinecke[1]
[1]Universität Freiburg, Freiburg im Breisgau, BW, Germany
[2]Hochschule Furtwangen, Tuttlingen, BW, Germany

The purpose of this study is to understand the growth mechanism of copper (Cu) films on a Cu-Zn system substrate with a pre-defined pattern. The pattern was defined by conducting a selective etching process on a two-phase polycrystalline substrate. As a result of this process, there were etched regions correspondent to beta-phase crystals and quasi non-etched regions that belong to alpha-phase ...

Modeling and Simulation of the Rapid and Automated Measurement of Biofuel Blending in a Microfluidic Device under Pressure Driven Flow using COMSOL Multiphysics®

Sanket Goel[1], Venkateswaran PS[1], Rahul Prajesh[2], Ajay Agarwal[2]
[1]University of Petroleum & Energy Studies, Bidholi, Prem Nagar, Dehradun, India
[2]CSIR - Central Electronics Engineering Research Institute,(CSIR-CEERI) Pilani, India

• Real-time detection and monitoring of bio-fuel blend-ratio and adulterated automobile fuels by a reproducible micro-fabrication process in a cost-and-time efficient manner. • COMSOL Multiphysics® simulations and modelling of Viscosity based Laminar Flow inside a Y-shaped Micro-fluidic Device. • Design and Fabrication of a polymer Y-shaped Micro-fluidic Device to work as Micro-Viscometer for ...

Stress Induced by Silicon-Germanium Integration in Field Effect Transistors

R. Berthelon [1], D. Dutartre [1], F. Andrieu [2]
[1] STMicroelectronics, France
[2] CEA Leti, France

The integration of high level of stress in field effect transistors is performed through incorporation of intrinsically strained SiGe layers. With the help of COMSOL simulations, we performed two studies addressing the level of stress in the area of interest. In the first case, we analyzed the geometric effects of the SiGe film stress relaxation on the edges. In a second time, we studied the ...

Thermally Induced-Noise Reduction Using an Electrostatic Force Feedback

H. Lee, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we present a method to mitigate the effect of thermally-induced noise in Micro-Electro-Mechanical Systems (MEMS) through a force feedback circuit. Inherent noise-induced vibrations, which would be inconsiderable in macro scale, are considered as a limitation in micro- and nano- scale since it diminishes the high performance of MEMS devices. For instance, depending on the stiffness ...

The Fabrication of a New Actuator Based on the Flexoelectric Effect

S. Baskaran[1], S. Thiruvannamalai[1], N. Ramachandran[1], F.M. Sebastian[1], and J.Y. Fu[1]
[1]State University of New York at Buffalo, Buffalo, New York, USA

This paper presents a novel methodology towards the design, analysis, and the fabrication process involved in developing a cost effective method to create a piezoelectric actuator by means of the flexoelectric effect. The basic physical equations of the flexoelectric effect and the qualitative analysis of the flexoelectric actuator are done using COMSOL Multiphysics. This effect is used to align ...

FEM Study on Contactless Excitation of Acoustic Waves in SAWDevices

A. K. Namdeo[1], N. Ramakrishna[2], H. B. Nemade[1,2], and R. P. Palathinkal[1]

[1] Department of Electronics and Communication Engineering, Indian Institute of Technology Guwahati, Assam, India
[2] Centre for Nanotechnology. Indian Institute of Technology Guwahati, Assam, India

In this paper a finite element method(FEM) study of a surface acoustic wave (SAW)device excited by electrostatic coupling method is performed by using COMSOL Multiphysics. We have modeled a Rayleigh wave type SAW device by choosing YZ Lithium niobate as the substrate. The effect of external radio frequency (RF) field to the SAW device is analyzed. The effect of distance between the contactless ...