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NIST Authors in Bold

Displaying 24401 - 24425 of 73721

Gallium nitride nanowire electromechanical resonators with piezoresistive readout

August 11, 2011
Author(s)
Kristine A. Bertness, Jason M. Gray, Norman A. Sanford, Charles T. Rogers
We report on the fabrication, piezoresistive readout, and frequency response of doubly-clamped c-axis gallium nitride (GaN) nanowire (NW) resonators that show mechanical quality factors exceeding 10,000. The devices are fabricated using a combination of

Graphene-metal interconnect: an atomistic simulation

August 11, 2011
Author(s)
Alexander Y. Smolyanitsky, Vinod K. Tewary
We develop a set of computationally efficient and accurate interatomic interactions for an atomistic simulation of the properties of graphene on nickel surface. The approach is based on the modified embedded atom method (MEAM) for the C-C and Ni-Ni

Microwave quantum logic gates for trapped ions

August 11, 2011
Author(s)
Dietrich G. Leibfried, Christian Ospelkaus, Ulrich J. Warring, Yves Colombe, Kenton R. Brown, J. M. Amini, David J. Wineland
Achieving control over physical systems at the quantum level is a goal shared by scientific fields as diverse as metrology, information processing, simulation and chemistry. For trapped atomic ions, the quantized motional and internal degrees of freedom

Modeling Enzymatic Kinetic Pathways for Ring-Opening Lactone Polymerization

August 11, 2011
Author(s)
Peter M. Johnson, Santanu S. Kundu, Kathryn Beers
A unified kinetic pathway for the enzyme catalyzed polymerization and degradation of poly(ε-caprolactone) was developed. This model tracks the complete distribution of individual chain lengths, both enzyme-bound and in solution, and successfully predicts

Potassium Induced Charge Transfer Effects in OPE-based Molecular Layers

August 11, 2011
Author(s)
Steven W. Robey, Gregory J. Dutton
The impact of potassium (K) addition on the electronic structure of oligo- (phenylene ethynylene) (OPE) and –NO2 substituted OPE (NO2-OPE) self-assembled monolayers was examined using ultraviolet photoemission. Addition below 0.5 K/molecule produced rigid

ALD for reliable nanowire self-assembly on microfabricated electrodes

August 10, 2011
Author(s)
Joseph J. Brown, Kristine A. Bertness, Alicia I. Baca, Bright M. Victor
The use of ALD TiO 2 surface coating improves dielectrophoretic assembly yield of individual GaN nanowires on micro-fabricated structures by as much as 67%. With titanium dioxide coating, individual nanowires were placed across suspended electrode pairs in

NIST-SP 500-291, NIST Cloud Computing Standards Roadmap

August 10, 2011
Author(s)
Michael D. Hogan, Fang Liu, Annie W. Sokol, Tong Jin
The NIST Cloud Computing Standards Roadmap Working Group has surveyed the existing standards landscape for security, portability, and interoperability standards/models/studies/use cases, etc., relevant to cloud computing. Using this available information

Selective Binding of O 2 over N 2 in Redox- Active Metal-Organic Framework with Open Iron(II) Coordination Sites

August 10, 2011
Author(s)
Eric D. Bloch, Leslie J. Murray, Wendy Queen, Sachin Chavan, Sergey N. Maximoff, Julian P. Bigi, Rajamani Krishna, Vanessa Peterson, Fernande Grandjean, Berend Smit, Silvia Bordiga, Craig Brown, Jeffrey R. Long
The air-free reaction of FeCl 2 and H 4dobdc (dobdc 4- = 2,5-dioxido-1,4- benzenedicarboxylate) in a mixture of DMF and methanol affords Fe 2(dobdc), a metal-organic framework isostructural to M 2(dobdc) (M = Mg 2+, Mn 2+, Co 2+, Ni 2+, Zn 2+). The

Using Block Copolymer Self-Assembly to Imprint the Crystallization of Polymer Dendrites

August 10, 2011
Author(s)
Sangcheol Kim, Alamgir Karim, Jack F. Douglas, Christopher L. Soles, R M. Briber
We utilize the self-assembly of cylinder-forming block copolymer (BCP) films to create templates for dendritic polymer crystallization patterns. This templating was achieved by simply spin-casting thin films from a solution containing both the BCP

Analyses of a Cantilever-Beam Based Instrument for Evaluating the Development of Polymerization Stresses

August 9, 2011
Author(s)
Martin Chiang, Anthony A. Giuseppetti, Joy Dunkers, Jing Qian, Sheng Lin-Gibson, Gary E. Schumacher, Joseph M. Antonucci
Analytical and finite element analyses have been performed on a cantilever-beam based methodology (tensometer) for evaluating the development of stresses as the concomitant of constrained polymerization shrinkage. A guideline for designing a tensometer

Controlling Formation of Atomic Step Morphology on Micro-patterned Si (100)

August 9, 2011
Author(s)
Kai Li, Pradeep Namboodiri, Sumanth B. Chikkamaranahalli, Gheorghe Stan, Ravikiran Attota, Joseph Fu, Richard M. Silver
Micro scale features are fabricated on Si (100) surfaces using lithographic techniques and then thermally processed in an ultra high vacuum (UHV) environment. Samples are flash heated at 1200 °C and further annealed at 1050 °C for 18 hours. The surface

Design and Optimization of a Permeation Testing System for Polymer Coatings

August 8, 2011
Author(s)
Adrian E. Verwolf
Measurements of liquid permeation through freestanding Parylene C membranes were made using a high- performance testing system, which demonstrated fast response (≤ 30 seconds) to changing concentrations in the sweep gas stream and detectability of less

Hierarchical Nanomorphologies Promote Exciton Dissociation in Polymer/Fullerene Bulk Heterojunction Solar Cells

August 8, 2011
Author(s)
Wei Chen, Tao Xu, Feng He, Wei Wang, Cheng Wang, Joseph Strzalka, Yun Liu, Jianguo Wen, Dean J. Miller, Jihua Chen, Kunlun Hong, Luping Yu, Seth B. Darling
PTB7 semiconducting copolymer comprising thieno[3,4-b]thiophene and benzodithiophene alternating repeat units set a historic record of solar energy conversion efficiency (7.4%) in polymer:fullerene bulk heterojunction (BHJ) solar cells. To further improve

High-accuracy Fabry-Perot displacement interferometry using fiber lasers

August 8, 2011
Author(s)
Mathieu Durand, John R. Lawall, Yicheng Wang
We describe ongoing work in a Fabry-Perot interferometry system designed to measure displacements over a range of 50~mm with sub-pm uncertainty. The apparatus involves probing two nearby modes of the Fabry-Perot cavity with narrow-linewidth fiber telecom

Perpendicular ferromagnetic resonance measurements of damping and Lande g-factor in sputtered (Co 2 Mn) 1-x Ge x thin films

August 8, 2011
Author(s)
Thomas J. Silva, Hans T. Nembach, Justin M. Shaw, Michael Schneider, Matt Carey, Stefan Maat, Jeff Childress
X-ray diffraction (XRD), magnetometry, and ferromagnetic resonance (FMR) measurements were performed on sputtered thin films of the nominal Heusler alloy (Co 2Mn) 1-xGe x with varying Ge content and annealing temperature. XRD indicates some degree of L2 1
Displaying 24401 - 24425 of 73721
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