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Materials

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Displaying 1876 - 1900 of 2347

Zone-Refinement Effect in Small Molecule-Polymer Blend Semiconductors for Organic Thin Film Transistors

December 14, 2010
Author(s)
Yeon Sook Chung, Nayool Shin, Jihoon Kang, Youngeun Jo, Vivek Prabhu, Regis J. Kline, John E. Anthony, Do Y. Yoon
The blend films of small molecule semiconductors with insulating polymers exhibit not only an excellent solution processability, but also superior performance characteristics (field-effect mobility, on/off ratio, threshold voltage and stability) over those

The Effect of Substrate Material on Silver Nanoparticle Antimicrobial Efficacy

December 1, 2010
Author(s)
Benita Dair, Dave M. Saylor, T. E. Cargal, Grace R. French, Kristen M. Kennedy, Rachel S. Casas, Jonathan E. Guyer, James A. Warren, Steven K. Pollack
With the advent of Nanotechnology, silver nanoparticles increasingly are being used in coatings, especially in medical device applications, to capitalize on their antimicrobial properties. The increased antimicrobial efficacy of nanoparticulate silver

A review of fatigue crack growth for pipeline steels exposed to hydrogen

November 30, 2010
Author(s)
Nicholas Nanninga, Andrew J. Slifka, Yaakov Levy, Calvin L. White
Hydrogen pipeline systems offer an economical means of storing and transporting energy in the form of hydrogen gas. Pipelines can be used to transport hydrogen that has been generated at solar and wind farms to and from salt cavern storage locations. In

PERFORMANCE ASSESSMENTS INSIGHTS ON THE USE OF CEMENTS IN WASTE MANAGEMENT

November 7, 2010
Author(s)
David W. Esh, Jacob Philip, Kenneth A. Snyder
The use of cementitious materials has been proposed in a variety of waste management systems because these materials can have a variety of desirable performance characteristics: hydraulic isolation, chemical isolation, structural stability. Cementitious

Effect of 3D Hydrogel Scaffold Stiffness on Human Bone Marrow Stromal Cell Differentiation

November 1, 2010
Author(s)
Carl G. Simon Jr., Sapun Parekh, Marcus T. Cicerone, Sheng Lin-Gibson, Kaushik Chatterjee, Marian F. Young
There is growing recognition cells can sense and respond to the mechanical properties of tissue scaffolds and that these interactions are critical in optimizing scaffold design [1-4]. Previous studies in planar 2D culture format have shown that human bone

On the Fracture Behavior of Nano-Layered Coatings Under Tension.

October 29, 2010
Author(s)
Daniel Josell, Herzl Chai
In this work the fracture behavior of a model brittle/ductile (Si/Ag) multilayer evaporated on a thick substrate is studied with the aid of a four-point bending apparatus. The system variables include individual layer thickness (2.5 to 30 nm), total film

Investigation of Thermally Responsive Block Copolymer Thin Film Morphologies Using Surface Gradients

October 20, 2010
Author(s)
Jennifer Y. Kelly, Julie N. Albert, John A. Howarter, Shuhui Kang, Christopher Stafford, Thomas H. Epps, Michael J. Fasolka
We report the use of a gradient library approach to characterize the structure and behavior of thin films of a thermally-responsive block copolymer (BCP), poly(styrene-b-tert-butyl acrylate), that exhibits chemical deprotection and morphological changes

New Intermetallics YbAu2In4 and Yb2Au3In5

October 20, 2010
Author(s)
Peter C. Sebastian, James Salvador, Joshua B. Martin, Mercouri G. Kanatzidis
The intermetallic compounds YbAu2In4 and Yb2Au3In5 were obtained as single crystals in high yield from reactions run in liquid indium. Single crystal X-ray diffraction data of YbAu2In4 showed that it crystallizes as a new structure type in the monoclinic

Integrated Computational Materials Engineering, CALPHAD and Hans Leo Lukas

October 16, 2010
Author(s)
Ursula R. Kattner, H. J. Seifert
Integrated Computational Materials Engineering (ICME) has become one of the new hot topics in materials science and engineering in recent years, and worldwide numerous conferences and symposia have been dedicated to this topic. In the report of the

Workshop on Quantitative Tools for Condition Assessment of Aging Infrastructure

October 14, 2010
Author(s)
Ward L. Johnson, Thomas A. Siewert, Jessica Terry, Dat Duthinh, Mark Iadicola, William E. Luecke, Joseph D. McColskey
The Quantitative Tools for Condition Assessment of Aging Infrastructure Workshop was held May 4-5, 2010, in Boulder, Colorado. It was organized by a team of researchers within the National Institute of Standards and Technology s (NIST) Materials Science

Effect of Phase Change and Solute Diffusion on Spreading on a Dissolving Substrate

October 1, 2010
Author(s)
Walter Villanueva, William J. Boettinger, James A. Warren, Gustav Amberg
Dissolutive wetting is investigated numerically using a diffuse-interface model that incorporates fluid flow, solute diffusion, and phase change. A range of materials parameters are investigated that: 1) permits recovery of the hydrodynamic limit by

Peer Review Report 2010

September 22, 2010
Author(s)
Thomas A. Siewert, Robert Smith, Theresa Bell, Joseph D. McColskey, Richard J. Fields
The Pipeline and Hazardous Materials Safety Administration s Pipeline Safety Research and Development (R&D) Program held a structured peer review of active research projects in April 2010. The peer review panel consisted of twelve government and industry

Photoresist latent and developer images as probed by neutron reflectivity methods

September 16, 2010
Author(s)
Vivek M. Prabhu, Shuhui Kang, David L. VanderHart, Eric K. Lin, Wen-Li Wu
Photoresist materials enable the fabrication of advanced integrated circuits with ever decreasing feature sizes. As next-generation light sources are developed, using extreme ultraviolet light of wavelength 13.5 nm, these highly-tuned formulations must

Stability and Surface Topography Evolution in Nanoimprinted Polymer Patterns under a Thermal Gradient

September 16, 2010
Author(s)
Christopher Soles, Yifu Ding, H. Jerry Qi, Kyle J. Alvine, Hyun W. Ro, Dae Up Ahn, Jack Douglas, Sheng Lin-Gibson
Nanostructures created in polymer films by nanoimprint lithography are subject to large stresses, both those from the imprinting processes as well as stresses arising from the intrinsic thermodynamic instabilities. These stresses can induce nanostructure

Surface Wrinkling: a Versatile Platform for Measuring Thin Film Properties

September 2, 2010
Author(s)
Jun Y. Chung, Adam J. Nolte, Christopher M. Stafford
Surface instabilities in soft matter have captivated the scientific community for decades. Recently, surface wrinkling has received a great deal of attention due to its simplicity and well-established mechanics of formation. Particularly, the use of

Effect of 3D Hydogel Scaffold Modulus and Topology on Human Bone Marrow Stromal Cell Fate

September 1, 2010
Author(s)
Kaushik Chatterjee, Sheng Lin-Gibson, Sapun Parekh, Nicole M. Moore, Marcus T. Cicerone, marian F. young, Carl Simon Jr.
There is growing recognition that cells can sense and respond to the physical cues from their environment, such as stiffness, mechanical loading and topology. Physical properties of the matrix can direct cellular response and are critical in the design of
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