Oak Ridge National Laboratory – Page 2

Imaging Bio-electro-mechanics with Scanning Probe Microscopy: Unveiling Nature’s Nanoscale Form and Function

Jesse S., Baddorf A.P., Rodriguez B.J., Gruverman A., Kalinin S.V., Oak Ridge National Laboratory, US

A novel scanning probe technique for studying the physiological structure and electro-mechanical properties of nanoscale biological systems is discussed. The almost universal presence of piezo response in biological material makes this method applicable to a [...]

Nanofiber Structures as Mimics for Cellular Membranes

Doktycz M.J., Zhang L., Melechko A.V, Klein K., McKnight T.E., Britt P.F., Guillorn M.A., Merkulov V.I., Lowndes D.H., Simpson M.L., Oak Ridge National Laboratory, US

We are investigating the use of vertically aligned carbon nanofibers (VACNFs) as a material for controlling molecular transport in a manner analogous to natural cell membranes. VACNFs can be synthesized with nanometer scale dimensions, can [...]

Electron Sources for Massively Parallel Electron Beam Lithography System using Single Vertically Aligned Carbon Nanofiber Cathodes

Guillorn M.A., Whealton J.H., Baylor L.R., Melechko A.V, Merkulov V.I., Hensley D.K., Hale M.D., Kasica R.J., Lowndes D.H., Simpson M.L., Oak Ridge National Laboratory, US

Electron beam lithography using a single beam cannot achieve acceptable throughput levels to become a viable manufacturing technology. The digital electrostatic e-beam array lithography (DEAL) concept under development at the Oak Ridge National Laboratory proposes [...]

Nanoelectronic Devices Constructed Using Individual Vertically Aligned Carbon Nanofibers

Yang X., Austin D.W., Guillorn M.A., Merkulov V.I., Melechko A.V, Lowndes D.H., Simpson M.L., Oak Ridge National Laboratory, US

We are fabricating active nanoscale electronic devices based on Vertically Aligned Carbon Nanofibers (VACNF). VACNFs are synthesized in a high-density Plasma-Enhanced Chemical Vapor Deposition (PECVD) process that provides a high degree of control of the [...]

Carbon Nanofiber-Based Electrode Interface to Microbial Biofilms

McKnight T.E., Melechko A.V, Guillorn M.A., Merkulov V.I., Fleming J.T., Hensley D.K., Hullander E., McPherson J., Nivens D., Sayler G.S., Lowndes D.H., Simpson M.L., Oak Ridge National Laboratory, US

We report on the integration of bacterial biofilms with carbon nanofiber-based electrochemical systems to provide a robust biosensor platform. Biofilms are robust, self-packaged communities of whole cells that have attracted much attention due to their [...]

Controlled Synthesis and Directed Assembly of Vertically Aligned Carbon Nanofibers for Functional Nanoscale Devices

Merkulov V.I., Melechko A.V, Guillorn M.A., McKnight T.E., Austin D.W., Hale M., Zhang L., Yang X., Hensley D.K., Subich T., Doktycz M.J., Lowndes D.H., Simpson M.L., Oak Ridge National Laboratory, US

The controlled synthesis and directed assembly of materials at the nanoscale remain two of the most difficult challenges for the realization of functional nanoscale devices. For example, while there has been a great deal of [...]

Effects of Backbone Disorder on Electronic Transport in DNA Molecules

Zhong J.X., Oak Ridge National Laboratory, US

A minimal model was recently proposed to explain the gap opening and the semi-conductor behavior in poly(G)-poly(C) DNA molecules. In this model, the large band gap is attributed to the hybridization of the G-G p [...]

Modeling a Growth Instability in Stressed and Ion-Implanted Doped Silicon

Phan A-V, Kaplan T., Gray L.J., Barvosa-Carter W., Aziz M.J., Oak Ridge National Laboratory, US

The effects of rate-enhancing dopants and externally applied stress on interfacial growth during silicon crystallization are modeled using advanced numerical methods. The boron doped crystalline Si is modeled as an isotropic linear elastic solid, and [...]

Computer Simulations of Electrokinetic Mass Transport in Microfabricated Fluidic Devices

Ermakov S.V., Jacobson S.C., Ramsey J.M., Oak Ridge National Laboratory, US

A mathematical model and computer code for simulat-ing electrokinetic fluid and sample manipulations in micro-fabricated fluidic devices (microchips) are described. The model accounts for mass transport mechanisms such as electrophoretic migration, bulk fluid motion due [...]