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Nanotechnology

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Displaying 751 - 775 of 940

Three-Magon Splitting and Confluence Processes for Magnetostatic Backward Volume-Spin-Wave Excitations in Yttrium Iron Garnet Films

April 27, 2009
Author(s)
Pavel Kabos, Cesar O. Ordonez-Romero, Boris A. Kalinikos, Pavol Krivosik, Wei Tong, Carl E. Patton
Brillouin light scattering (BLS) has been used to observe and confirm the existence of nonlinear three magnon splitting and confluence processes for propagating spin waves in the magnetostatic backward volume wave (MSBVW) configuration. Wave vector and

Available states and available space: Static properties that predict dynamics of confined fluids

April 8, 2009
Author(s)
Vincent K. Shen, Gaurav Goel, William P. Krekelberg, Mark J. Pond, Jeetain Mittal, Jeffrey R. Errington, Thomas M. Truskett
Although classical density functional theory provides reliable predictions for the static properties of simple equilibrium fluids under confinement, a theory of comparative accuracy for the transport coefficients has yet to emerge. Nonetheless, there is

Nanofluidic Structures with Complex Three Dimensional Surfaces

March 31, 2009
Author(s)
Samuel M. Stavis, Elizabeth Strychalski, Michael Gaitan
A fabrication process was developed to construct nanofluidic devices with complex three dimensional (3D) topographies. A single layer of grayscale photolithography enabled arbitrary and simultaneous control of numerous nanoscale etch depths in a fused

Dielectric Spectroscopy Investigation of Relaxation in C60-Polyisoprene Nanocomposites

March 23, 2009
Author(s)
Yifu Ding, Sebastian Pawlus, Alexei Sokolov, Jack F. Douglas, Alamgir Karim, Christopher Soles
We investigate the influence of adding C60 nanoparticles on the dielectric relaxation spectra of both unentangled and entangled polyisoprene (PIP). Relaxation modes corresponding to both segmental and chain relaxation were analyzed over a broad temperature

On the Sub-Nanometer Resolution of Scanning Electron and Helium Ion Microscopes

March 1, 2009
Author(s)
Andras Vladar, Michael T. Postek, Bin Ming
All forms of microscopy are being pushed to the limit by nanotechnology. Hence, there is a relentless quest to achieve better and better resolution with various electron and ion microscopes and to monitor and maintain these instruments to achieve the best

Design of an on-chip microscale nanoassembly system

February 10, 2009
Author(s)
Jason J. Gorman, Yong Sik Kim, Andras Vladar, Nicholas G. Dagalakis
A microscale nanoassembly system has been designed for the fabrication of nanodevices and in situ electromechanical characterisation of nanostructures. This system consists of four Microelectromechanical Systems(MEMS)-based nanomanipulators positioned

Surface Potential Imaging of Solution Processable Acene-Based Thin Film Transistors

December 2, 2008
Author(s)
Lucile C. Teague, Behrang H. Hamadani, John E. Anthony, David J. Gundlach, James G. Kushmerick, Sanker Subramanian, Thomas Jackson, Curt A. Richter, Oana Jurchescu
We report scanning Kelvin probe microscopy (SKPM) of electrically biased difluoro bis(triethylsilylethynyl) anthradithiophene (diF-TESADT) organic thin film transistors. SKPM reveals the relationship between the diF-TESADT film structure and device

Electrical Manipulation of Gold Nanoparticles for Microfluidic Applications

October 16, 2008
Author(s)
Darwin R. Reyes-Hernandez, Geraldine I. Mijares, Kimberly A. Briggman, Jon C. Geist, Michael Gaitan
An electrical method to trap and release gold nanoparticles to and from the surface of alkanethiol-modified gold electrodes is presented. When a positive bias versus a Ag/AgCl reference electrode was applied to gold electrodes, negatively-charged gold

Calibration of a Force Feedback Joystick

August 29, 2008
Author(s)
J H. Daruwalla, Nicholas Dagalakis
The objective of this project was to calibrate a commercially available force feedback joystick that could be used for the control of a laser beam optical tweezers test-bed. A calibration box was built to hold the joystick and the load-cell. The joystick

Molecule induced interface states dominate charge transport in Si-alkyl-metal junctions

August 26, 2008
Author(s)
Lam H. Yu, Nadine E. Gergel-Hackett, Christopher D. Zangmeister, Christina A. Hacker, Curt A. Richter, James G. Kushmerick
Abstract. Semiconductor-molecule-metal junctions consisting of alkanethiol mono- layers self-assembled on both p+ and n¡ type highly doped Si(111)wires contacted with a 10 ¹m Au wire in a crossed-wire geometry are examined. Low temperature transport

Surface-plasmon-enhanced electric fields in two-dimensional arrays of gold nanodisks

August 4, 2008
Author(s)
Ward L. Johnson, Sudook A. Kim, Zhandos Utegulov, B. T. Draine
Electric-field distributions in two-dimensional arrays of gold nanodisks on Si3N4 membranes are modeled, using the discrete-dipole approximation, as a function of nanodisk diameter (20 − 50 nm), height (10 − 100 nm), ratio of the array spacing to diameter

Surface Effects on the Elastic Modulus of Te Nanowires

June 17, 2008
Author(s)
Gheorghe Stan, Sergiy Krylyuk, Albert Davydov, Mark D. Vaudin, Leonid A. Bendersky, Robert F. Cook
Nondestructive elastic property measurements have been performed on Te nanowires with diameters in the range 20 150 nm. By using contact resonance atomic force microscopy, the elastic indentation modulus perpendicular to the prismatic facets of the

Multiscale Green's function for deflection of graphene lattice

June 2, 2008
Author(s)
B. Yang, Vinod Tewary
Fundamental deflection behavior of an infinite two-dimensional graphene lattice subjected to a transverse point force has been analyzed using lattice statics and the continuum Green's functions. An analytic expression has been derived for the lattice

Origin of Adhesion in Humid Air

April 18, 2008
Author(s)
Doo-In Kim, Jaroslaw Grobelny, Pradeep N. Namboodiri, Robert F. Cook
The origin of adhesion at nanoscale contacts in humid air is investigated by pull-off force measurements using atomic force microscopes in controlled environments from ultra-high vacuum through various humidity conditions to water. An equivalent work of

Vibrational modes of nanolines

March 5, 2008
Author(s)
Paul R. Heyliger, Colm Flannery, Ward L. Johnson
Brillouin-light-scattering spectra previously have been shown to provide information on acoustic modes of polymeric lines fabricated by nanoimprint lithography. Finite-element methods for modeling such modes are presented here. These methods provide a
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