Sandia National Laboratories – Page 3

Quantum Transport in Nanotube Transistors

Leonard F., Sandia National Laboratories, US

We discuss recent calculations of electronic transport in a 10 nm long, three-terminal carbon nanotube device. By calculating self-consistently the electrostatic potential and charge in the device, we obtain the band bending along the nanotube [...]

Uncertainty Quantification in a Reacting Electrochemical Microchannel Flow Model

Debusschere B., Najm H., Matta A., Shu T., Knio O., Ghanem R., Le Maitre O., Sandia National Laboratories, US

We describe a technique for modeling electrochemical microchannel flows including the propagation of uncertainty from model parameters and boundary conditions to the model predictions. The approach uses a pseudo-spectral stochastic construction with a polynomial chaos [...]

Development and Performance of a PVM Based Parallel Geometric Modeler for MEMS

Jorgensen C., Melander D., Schmidt R., Plimpton S., Sandia National Laboratories, US

This paper describes a successful approach to improving the robustness and speed of Sandia National Laboratory’s 3-D MEMS geometry modeler through a combination of mask subdivision and code parallelization. Symptoms of the robustness problems experienced [...]

Atomistic Simulations of Wetting and Spreading in Metal Systems

Webb III E.B., Grest G.S., Sandia National Laboratories, US

Using molecular dynamics (MD) simulations, we examine wetting and spreading in metallic systems as described by the embedded atom method (EAM). We first discuss a common shortcoming of EAM potentials for describing metal surfaces and [...]

Large-scale Simulations of Adhesion in Dense Polymer Melts

Sides S.W., Grest G.S., Stevens M.J., Sandia National Laboratories, US

We study adhesion between a polymer melt and substrate due to tethered chains on the substrate surface. We have performed extensive molecular dynamics simulations to study the effect of tethered chain density (S), tethered chain [...]

A 2D Visualization Tool for SUMMiT V Designs

Yarberry V.R., Jorgensen C.R., Sandia National Laboratories, US

This paper describes the 2D Process Visualizer, a CAD tool that enables a SUMMiT (Sandia Ultra-Planar Multilevel MEMS Technology) MEMS designer to visualize the results of applying the process sequence to a mask set by [...]

A 3D Geometry Modeler for the SUMMiT V MEMS Designer

Jorgensen C.R., Yarberry V.R., Sandia National Laboratories, US

This paper will describe the SUMMiT V 3D Modeler; a 3D geometric modeler based on Sandia National Laboratories new five-level process for manufacturing microelectromechanical systems (MEMS). The modeler simulates the SUMMiT V process, a baseline [...]

Inverted Method for Simulation of Electrokinetic Transport in Microchannel Devices

Nilson R.H., Griffiths S.K., Sandia National Laboratories, US

An inverted method of solution is used to numerically solve the equations governing electrokinetic fluid flow and species transport in microscale turns, junctions and curved channels. Rather than solving for the electric potential and fluid [...]

Electroosmotic Flow in a Tube or Channel for Non-Negligible Zeta Potentials

Griffiths S.K., Nilson R.H., Sandia National Laboratories, US

Numerical methods based on a shooting technique are employed to determine the electric potential and fluid velocity in a tube and channel when the zeta poten- tial is not small. In addition, new analytical solutions [...]

Torsional Ratcheting Actuating System

Barnes S.M., Miller S.L., Rodgers M.S., Bitsie F., Sandia National Laboratories, US

A new type of surface micromachined ratcheting actuation system has been developed at the Microelectronics Development Laboratory at Sandia National Laboratories. The actuator uses a torsional electrostatic comb drive that is coupled to an external [...]