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Geometry of Diffusion and the Performance Limits of Nanobiosensors
05 Dec 2006 | Online Presentations | Contributor(s): Muhammad A. Alam, Pradeep Ramachandran Nair
This presentation demonstrates how the classical diffusion-capture (D-C) model has improved sensor performance, since the D-C model is a "geometry of diffusion" rather than a "geometry of electrostatics." A scaling law based on D-C is also posited; the scaling law resolves many classical puzzles...
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RF MEMS: Passive Components and Architectures
02 Jan 2007 | Online Presentations | Contributor(s): Dimitrios Peroulis
This seminar is an introduction to the MEMS technology as itapplies to RF and Microwave systems. Besides discussing several key RFMEMS components (switches, varactors, inductors), reconfigurable circuitarchitectures will also be introduced. In addition, reliability and costconsiderations as...
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SPMW The Nanomechanics of compositional mapping in amplitude modulation AFM
05 Jan 2007 | Online Presentations | Contributor(s): Ricardo Garcia
Amplitude modulation atomic force microscopy (AM-AFM) has been very successful for imaging with high spatial resolution inorganic as well as soft materials such as polymers, living cells and single biomolecules in their natural environment [1]. The ability of AM-AFM to separate topography from...
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Materials strength: does size matter? nanoMATERIALS simulation toolkit tutorial
01 Feb 2007 | Online Presentations | Contributor(s): Alejandro Strachan
Molecular dynamics (MD) is a powerful technique to characterize the fundamental, atomic-level processes that govern materials behavior and is playing an important role in our understanding of the new phenomena that arises in nanoscale and nanostructured materials and result in their unique...
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Toward Improving the Precision of Nanoscale Force-Displacement Measurements
13 Mar 2007 | Online Presentations | Contributor(s): Jason Clark
Nanotechnology has great potential for being used to create better medicines, materials, and sensors. With increasing interest in nanotechnology to improve the quality of our lives, there has been an increasing use of nanoscience tools to measure force and displacement to understand nanoscale...
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Is Seeing Believing? How to Think Visually and Analyze with Both Your Eyes and Brain
26 Mar 2007 | Online Presentations | Contributor(s): David Ebert
This presentation will cover the basic techniques, and some of the available tools, for visualization, and will explain how to avoid miscommunicating information from visualizations.
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Renormalization Group Theories of Strongly Interacting Electronic Structure
20 Apr 2007 | Online Presentations | Contributor(s): Garnet Chan, NCN at Northwestern University
Our work is in the area of the electronic structure and dynamics of complex processes. We engage in developing new and more powerful theoretical techniques which enable us to describe strong electronic correlation problems.Of particular theoretical interest are the construction of fast...
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Nanoscale Antenna Apertures
24 Apr 2007 | Online Presentations | Contributor(s): Xianfan Xu
This presentation will discuss light concentration and enhancement in nanometer-scale ridge aperture antennas. Resent research, including numerical simulations and near field optical measurements has demonstrated that nanoscale ridge antenna apertures can concentrate light into nanometer domain....
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Solid-State Lighting: An Opportunity for Nanotechnologists to Address the Energy Challenge
25 Apr 2007 | Online Presentations | Contributor(s): Timothy D. Sands
More than one-fifth of the electrical power consumed in the U.S. is used for general illumination. Much of this energy is wasted to heat filaments in incandescent lamps, a century-old technology with an efficiency of about 5%. Fluorescent lighting is more efficient, but problems of color quality,...
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Introduction to X-ray Photoelectron Spectroscopy and to XPS Applications
17 May 2007 | Online Presentations | Contributor(s): Dmitry Zemlyanov
X-ray Photoelectron Spectroscopy (XPS), which is known as Electron Spectroscopy for Chemical Analysis (ESCA), is a powerful research tool for the study of the surface of solids. The technique is widely used for studies of the properties of atoms, molecules, solids, and surfaces. The...
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Nucleic Acids
07 May 2007 | Online Presentations | Contributor(s): Don Bergstrom
Living organisms are self-assembling systems that achieve an enormous variety of functions through organization of components from sub-nanometer to meter scale. Understanding the functions of these systems must start with a study of the molecular components, their structures and interactions. By...
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Modeling and Analysis of VLSI Interconnects
10 May 2007 | Online Presentations | Contributor(s): Cheng-Kok Koh
With continual technology scaling, the accurate and efficient modeling and simulation of interconnect effects have become problems of central importance. In order to accurately model the distributive effects of interconnects, it is necessary to divide a long wire into several segments, with each...
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Electron Emission from Nanoscale Carbon Materials
15 May 2007 | Online Presentations | Contributor(s): Timothy S Fisher
Prior studies on electron emission show possibly beneficial effects ofnanoscale phenomena on energy-conversion characteristics. For example,recent work has shown that the electric field around a nanoscale fieldemission device can increase the average energy of emitted electrons. Weconsider here...
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SUGAR: the SPICE for MEMS
21 May 2007 | Online Presentations | Contributor(s): Jason Clark
In this seminar, I present some design, modeling, and simulation features of a computer aided engineering tool for microelectromechanical systems (MEMS) called SUGAR. For experimental verification, I use a microdevice that is difficult to simulate with conventional MEMS software. I show that...
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Orbital Mediated Tunneling in a New Unimolecular Rectifier
25 May 2007 | Online Presentations | Contributor(s): Robert Metzger, NCN at Northwestern University
In 1997 we showed that hexadecylquinolinium tricyanoquinodimethanide is a unimolecular rectifier, by scanning tunneling microscopy and also as a Langmuir-Blodgett (LB) monolayer, sandwiched between Al electrodes. We have now seen rectification in a new molecule: this rectification can be followed...
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Dripping, Jetting, Drops and Wetting: the Magic of Microfluidics
13 Jun 2007 | Online Presentations | Contributor(s): David A. Weitz
This talk will discuss some of the new opportunities That arises by precisely controlling fluid flow and mixing using microfluidicdevices. I describe studies to elucidate mechanisms of drop formation and use these to create new fluid structures that are difficult to achieve with my other method....
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Introduction to and Advances in Self-Healing Polymers
14 Jun 2007 | Online Presentations | Contributor(s): Gerald O. Wilson
The presenter briefly introduces the topic of Self-Healing Polymer research and continues to give a Survey of Ruthenium Metathesis Catalysts for Ring Opening Metathesis Polymerization-Based Self-Healing ApplicationsGerald O. Wilson is a Ph.D. Candidate in the Department of Materials Science...
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Selective Silicon Epitaxy Seen at the Nanometer Scale
14 Jun 2007 | Online Presentations | Contributor(s): Matthew Mark Sztelle
The presenter introduces NEMS (nanoelectromechanical systems) and STM (Scanning Tunneling Microscopy and continues to present material on Selective Silicon Epitaxy seen at the Nanometer ScaleMatthew M. Sztelle is a Research Assistant in the Scanning Tunneling Microscopy Group at the Beckman...
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Molecular Interferometry
26 Jun 2007 | Online Presentations | Contributor(s): David D. Nolte
While single-molecule detection through fluorescence has now become common-place, there has been no analogous single-molecule capability using direct detection approaches such as interferometry. This limitation is slowly yielding to high-speed interferoemtric detection that is pushing the...
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Electrons in Two Dimensions: Quantum Corrals and Semiconductor Microstructures
04 Dec 2007 | Online Presentations | Contributor(s): Eric J. Heller
The images generated by a scanning tunneling microscope are iconic. Some of the most famous are Don Eigler’s quantum corrals, which reveal not only the guest atoms on a surface but especially the interference patterns of electrons shuttling back and forth along the surface. To understand the...