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Materials

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Displaying 1951 - 1975 of 2347

Prediction of Collagen and Glycosaminoglycan Content by Acoustic Microscopy

April 21, 2010
Author(s)
Jenni R. Popp, Colm Flannery, Tammy L. Oreskovic, Jennifer Recknor, Kristi S. Anseth, Timothy P. Quinn
Functional tissue engineering of articular cartilage is rapidly advancing as a technique to develop regenerative and reparative treatments for cartilage degeneration and osteoarthritis. Tissue engineered constructs are often developed using a combination

Diffusion Parameters and Growth Mechanism of Phases in the Cu-Sn System

April 15, 2010
Author(s)
William J. Boettinger, C Ghosh, A Paul
The tracer diffusion coefficients of the elements as well as the integrated interdiffusion coefficients are measured for the Cu(sub3)Sn and Cu(sub6)Sn(Sub5) intermetallic compounds using incremental diffusion couples. The activation energies are determined

Direct Evidence of Nanoparticle Release from Epoxy Nanocomposites Exposed to UV Radiation

April 14, 2010
Author(s)
Tinh Nguyen, Bastien T. Pellegrin, Coralie Bernard, Xiaohong Gu, Justin M. Gorham, Paul E. Stutzman, Alexander J. Shapiro, Walter E. Byrd, Joannie W. Chin
This study assessed the fate of SiO2 nanoparticles (nanoSiO2) in epoxy/nanoSiO2 composites exposed to ultraviolet (UV) radiation. The matrix was a stoichiometric mixture of adiglycidyl ether of bisphenol A epoxy and an aliphatic tri-amine. Films of

Modeling of the Temperature Field in the Chip and in the Tool in High-speed Machining of a Carbon Steel: Effect of Pearlite to Austenite Phase Transition in AISI 1075

April 7, 2010
Author(s)
Timothy J. Burns, Steven P. Mates, Richard L. Rhorer, Eric P. Whitenton, Debasis Basak, Russell H. McFadden
A one-dimensional transient finite-difference model for the temperature distribution in orthogonal metal cutting, which was originally developed by Boothroyd, and then improved upon by Tlusty, is used to calculate the temperature field in the chip and in

Teeth: Among Nature's Most Durable Biocomposites

April 6, 2010
Author(s)
Brian R. Lawn, James J. Lee, H Chai
This paper addresses the durability of natural teeth from a materials perspective. Teeth are depicted as 'smart' biocomposites, highly resistant to cumulative deformation and fracture. Favorable morphological features of teeth at both macroscopic and

Assessing and Improving Bonding in Wet Conditions

April 3, 2010
Author(s)
Kar T. Tan, Christopher C. White, Donald L. Hunston, Vogt D. Bryan, Anthony Haag
Water is ubiquitous in any uncontrolled setting and affects world wide commerce by instigating device and structural failures. This can be a result of corrosion, electrical shorting, or adhesive failure. For adhesive failure, the environmental attack of

Adhesion research at the National Institute of Standards and Technology (NIST)

April 1, 2010
Author(s)
Christopher M. Stafford, Adam J. Nolte, Gale A. Holmes, Sheng Lin-Gibson, John A. Howarter
NIST s involvement in adhesion research has been wide ranging and is ultimately in response to interactions between individual project leaders and our industrial partners. In this way, NIST s participation in the Adhesion Society has been instrumental in

Influence of Ti and Ta doping on the irreversible strain limit of ternary Nb 3 Sn superconducting wires made by the restacked-rod process

April 1, 2010
Author(s)
Najib Cheggour, Loren F. Goodrich, Theodore C. Stauffer, Jolene D. Splett, Xifeng Lu, A. K. Ghosh, G. Ambrosio
Nb 3Sn superconducting wires made with restacked-rod process (RRP®) were found to have a dramatically improved resilience to axial tensile strain when alloyed with Ti as compared to Ta. Whereas Ta-alloyed Nb 3Sn in RRP wires showed permanent damage to its

Multiwalled carbon nanotubes coated with silicon carbonitride (SiCN)

April 1, 2010
Author(s)
Katie Hurst, Christopher L. Cromer, Elisabeth Mansfield, Roop Mahajan, John H. Lehman, Gurpreet Singh
We describe the development of two next-generation optical coatings; amorphous polymer-derived silicon carbonitride (SiCN) particles and a composite consisting of SiCN surrounding a multiwalled carbon nanotube (MWCNT) core. Laser-induced damage testing of

N-Pyrrolidine Functionalized C 60 -Fullerenes/Epoxy Nanocomposites

March 26, 2010
Author(s)
Mickey Richardson, Eun S. Park, Jaehyun Kim, Gale A. Holmes
A small series of functionalized C60-fullerene/epoxy nanocomposites were prepared, and their respective ultimate tensile strengths were determined. The functionalization route of the fullerenes was performed using the well-known Prato reaction, with

Harnessing Wrinkle Delamination Mechanics to Measure and Pattern Polymer Coatings

March 21, 2010
Author(s)
Adam J. Nolte, Jun Y. Chung, Christopher Stafford
Compressive stresses in stiff polymer coatings can give rise to surface instabilities in which the coating adopts a sinusoidally wrinkled morphology with a dominant wavelength, d, as displayed in Figure 1a. Such instabilities are generally observed for

NIST Sustainable Infrastructure Material Program

March 17, 2010
Author(s)
Jonathan W. Martin, Xiaohong Gu, Tinh Nguyen, Joannie W. Chin
NIST has initiated a research program for improving the quality of the data input for making economic sustainability assessments of polymeric infrastructure materials through improvements in the measurement science for this data. Sustainability assessments

Accelerator Surface Phase Associated with Superconformal Cu Electrodeposition

March 5, 2010
Author(s)
Thomas P. Moffat, Liang Yueh Ou Yang
Superconformal film growth is a key process in state-of-the-art Cu metallization of electronic devices. Superfilling of recessed surface features results from competition between electrolyte additives that accelerate or inhibit Cu electroplating. In situ

Water based Polyurethane Graphene Oxide Nanocomposites

March 3, 2010
Author(s)
Coralie Bernard, Tinh Nguyen, Bastien T. Pellegrin, Mat Celina, Alexander J. Shapiro, Deborah Jacobs, Kar T. Tan, Sungjin Park, R. S. Ruoff, Joannie W. Chin
Graphene oxides are potentially a new class of nanomaterial to enhance multifunctional properties of polymers because of their remarkable thermal conductivity, mechanical strength, and more importantly, low cost. The graphene oxides, produced by
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