Papers – Page 11 – TechConnect Briefs

Development of Thermodynamic Methods for the study of Nanopores

Paul R., Paddison S.J., University of Calgary, CA

A statistical mechanical formalism is presented for the calculation of the thermodynamic properties of the water in nanopores of polymer electrolytes, with particular emphasis on the polarization. We describe a method that exploits the variational [...]

Molecular Modeling of Proton Conduction in Polymer Electrolyte Membranes of Nafion® Type

Paddison S.J., Eikerling M., Zawodzinski_Jr. T.A., Pratt L.R., Los Alamos National Laboratory, US

Molecular mechanisms of proton conduction in polymer electrolyte membranes are addressed by ab initio molecular dynamics calculations, utilizing the VASP program, on the model system trifluoromethane sulfonic acid monohydrate solid. After establishing that the experimental [...]

Macromolecules in Microdevices: Multiscale simulation of DNA dynamics in model microfluidic geometries

Jendrejack R.M., de Pablo J.J., Graham M.D., University of Wisconsin-Madison, US

Simple arguments predict that the dynamics of a dissolved macromolecule confined to a channel comparable to its equilibrium coi size (~1 um for viral DNA) are quite different from those in free solution, because of [...]

Simulation Methodology for Dielectrophoresis in Microelectronic Lab-on-a-chip

Leonardi A., Medoro G., Manaresi N., Tartagni M., Guerrieri R., DEIS - University of Bologna, IT

Recent trends in lab-on-a-chip show a growing use of dielectrophoresis (DEP) to manipulate biological objects such as cells and organic molecules [1], [2], [3], [4]. Bringing the advances of microelectronic miniaturization into biological and clinical [...]

Biochemical Binding in Microspheres-Based-Imunoassays

Prabhakarpandian B., Shah K.B., Sundaram S., Makhijani V.B., CFD Research Corporation, US

Microspheres (referred commonly as beads) are being extensively used in biochemical assays as supports for proteins, DNA, etc. We have successfully developed |omputational models for simulating sample detection using flowing beads. The model fully integrates [...]

Separation of Long Polyelectrolytes in a Microfuluidic Channel with Constrictions: A Monte Carlo Study

Tessier F., Slater G.W., University of Ottawa, CA

We present Monte Carlo simulation results for the motion of long linear polyelectrolytes inside a microchannel of molecular dimensions, structured as a periodic array of wells linked by narrow constrictions. Molecules are driven in the [...]

Squeezing Flow of Particles and Large Molecules Suspended in a Liquid Through Nanochannels

Acrivos A., Khusid B., Koplik J., Drazer G., New Jersey Institute of Technology, US

The presentation addresses the status of current understanding of the hydrodynamic phenomena accompanyin the motion of a nanometer-sized particle through a nanotube.

Direct Numerical Simulation of Moving Charged, Flexible Bodies with Thermal Fluctuations

Patankar N.A., Northwestern University, US

The interaction of sub-micron scale objects with fluids is an important problem encountered in miniaturized systems. Various physical phenomena should be modeled simultaneously for a fundamental investigation of these systems. Our objective is to develop [...]

Transient Analysis of Electroosmotic Flow in Nano-diameter Channels

Qiao R., Aluru N.R., University of Illinois at Urbana-Champaign, US

Transient analysis of electroosmotic flow in a nano-diameter channel is presented. The time for flow to reach steady state in a nano-diameter channel for various Debye lengths is investigated by solving the Navier-Stokes equations in [...]

Numerical and Analytical Studies of AC Electric Field in Dielectrophoretic Electrode Arrays

Feng J.J., Krishnamoorthy S., Chen Z.J., Makhijani V.B., CFD Research Corporation, US

Manipulation of micro-sized particles and biological cells using dielectrophoresis (DEP) is an emerging technique in MEMS and nano technology[3]. This paper presents an exact solution of dielectrophoretic motion of a polarized particle in the vicinity [...]