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Displaying 1676 - 1700 of 3718

Tensile behavior of single PPTA fibers measured by the Kolsky bar using the direct fiber clamping method

June 11, 2012
Author(s)
Jae Hyun Kim, Nathanael A. Heckert, Stefan D. Leigh, Haruki Kobayashi, Walter G. McDonough, Richard L. Rhorer, Kirk D. Rice, Gale A. Holmes
The Kolsky bar test has been widely used in measuring material behavior under high strain rate conditions. In particular, this methodology has been used to characterize the high strain rate behavior of polymer and polymer composites during ballistic impact

Pronounced micro-segregation in a sorbitol water mixture observed through variable temperature neutron scattering

May 16, 2012
Author(s)
Shin G. Chou, Sheila Khodadadi, Joseph E. Curtis, Susan Krueger, Evgenyi Shalaev, Alan Soper, Andy Fitch, T Narayanan, Michael Szutucki, Marcus T. Cicerone
In this study, we use small and wide angle X-ray and neutron scattering measurements, to study the structure of concentrated sorbitol solutions and glasses at different temperatures. The analysis of the data suggests the water forms clusters with a

Optimization of Imaging Polymer Based Scaffolds Using X-Ray Microcomputed Tomography

May 15, 2012
Author(s)
David E. Morris, Melissa L. Mather, Carl Simon Jr., John A. Crowe
The performance of polymer based scaffolds used in regenerative medicine is linked to their structural properties and as such strategies for structural characterization of scaffolds have been developed. X-ray microscopic computed tomography (X-ray micro CT

Neutron reflectivity characterization of the photoacid reaction-diffusion latent and developed images of molecular resists for extreme-ultraviolet lithography

May 11, 2012
Author(s)
Vivek M. Prabhu, Shuhui Kang, Wen-Li Wu, Sushil K. Satija, Christopher K. Ober, Jing Sha, Peter V. Bonnesen
Lithographic feature size requirements have approached a few radius of gyration of chemically-amplified photoresist polymers used in thin film patterning. Further, the feature dimensions are commensurate with the photoacid diffusion length that defines the

An Overview of Polymer Electrolyte Membranes for Fuel Cell Applications

May 7, 2012
Author(s)
Brandon W. Rowe, Kirt A. Page
While fuel cells have receive considerable attention over the last 10-20 years, the history of hydrogen fuel cells dates back to 1838. It would take more than a century before polymers would be impletmented as an electrolyte for proton transport (1955) and

Inelastic Neutron Scattering on Polymer Electrolytes for Lithium-Ion Batteries

May 7, 2012
Author(s)
Huagen H. Peng, Madhu Sudan Tyagi, Kirt A. Page, Christopher Soles
The relationship between ion transport and polymer dynamics is central to the pursuit of solid polymer electrolytes for lithium batteries. This understanding is critical to achieve solid polymer electrolyte systems of sufficiently high ion conductivities

Understanding Interfacial Structure of Proton Exchange Membrane Fuel Cells

May 7, 2012
Author(s)
Kirt A. Page, Sangcheol Kim, Christopher L. Soles
Although substantial improvements have been demonstrated for fuel cell technology over the past decade, the major technical challenges as associated with cost and durability should be overcome for fuel cells to compete in real markets and achieve wide

Gas-Foamed Scaffold Gradients for Combinatorial Screening in 3D

May 1, 2012
Author(s)
Carl G. Simon Jr., Kaushik Chatterjee, Alison M. Kraigsley, Joachim Kohn, Durgadas Bolikal
Current methods for screening cell-material interactions typically utilize two-dimensional (2D) culture format where cells are cultured on flat surfaces. However, there is a need for combinatorial and high-throughput screening methods to systematically

Osteoblast Response to Serum Protein Adsorption in 3D Polymer Scaffolds

May 1, 2012
Author(s)
Carl G. Simon Jr., Girish Kumar, Kaushik Chatterjee, Stevephen Hung
Protein adsorption is known to direct biological response to biomaterials and is important in determining cellular response in tissue scaffolds. In this study we investigated the effect of adsorbed serum proteins on cell attachment and proliferation in

SOLID-SUPPORTED ENZYME CATALYST MODELS FOR RING-OPENING POLYMERIZATION

April 27, 2012
Author(s)
Sara V. Orski, Santanu S. Kundu, Kathryn L. Beers, Richard A. Gross
The enzyme Candida antarctica Lipase B (CAL B), immobilized on a crosslinked poly(methyl methacrylate) (PMMA) support, catalyzes the ring-opening polymerization of ε-caprolactone to make biodegradable polyesters. Weak hydrophobic interactions of CAL B

Materials Challenges in Carbon Mitigation Technologies

April 24, 2012
Author(s)
Laura Espinal, Bryan D. Morreale
Thermochemical conversion of fossil fuels currently dominates the national and global energy portfolio, with the most notable being the stationary power production and transportation vehicles sectors. As global energy demand continues to increase
Displaying 1676 - 1700 of 3718
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