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Bioscience

Biomaterials

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Displaying 1001 - 1025 of 1728

Investigation of the Charge Compensation Mechanism on the Electrochemically Li-Ion Deintercalated Li 1-x Co 1/3 Ni 1/ 3MN 1/3 O 2 Electrode System by Combination of Soft and Hard X-Ray Absorption Spectroscopy

January 11, 2005
Author(s)
W S. Yoon, Kyung Y. Chung, Xiao-Qing Yang, James McBreen, Mahalingam Balasubramanian, C P. Grey, Daniel A. Fischer
In situ hard X-ray absorption spectroscopy (XAS) at metal K-edges and soft XAS at O K-edge and metal L-edges have been carried out during the first charging process for the layered Li1-2Co1/3Ni1/3Mn1/3O2 cathode material. The metal K-edge XANES results

Bioactive Surface Gradients to Control Cell Adhesion

January 1, 2005
Author(s)
Matthew Becker, Nathan D. Gallant, Eric J. Amis
Incorporating discrete cell adhesion motifs onto substrates in a defined orientation with variable spacing and increasing concentration offers a robust strategy for measuring ligand dependent cell-material interactions and encouraging specific cell

Elastic Instability of Multilayer Films Coated on Substrates

January 1, 2005
Author(s)
Shu Guo, Martin Y. Chiang, Christopher M. Stafford
Mechanical properties of ultra-thin (submicrometer) films coated on a substrate are paramount in many applications. One question arises as to whether the physical and mechanical properties of supported thin films in applications can be significantly

Stress Analysis for Combinatorial Buckling-Based Metrology of Thin Film Modulus

January 1, 2005
Author(s)
Shu Guo, Christopher M. Stafford, Martin Y. Chiang
We recently reported on a new buckling-based metrology for probing the elastic modulus of thin polymer films. In this experimental geometry, a thin film of interest is transferred to a relatively thick elastic substrate, and buckling is induced by

Synthesis and Characterization of Poly(ethylene glycol) Dimethacrylate Hydrogels

January 1, 2005
Author(s)
Sheng Lin-Gibson, S Bencherif, Joseph M. Antonucci, Horkay F. JonesRL
Facile synthesis and detailed characterization of photo-polymerizable and biocompatible poly(ethylene glycol) dimethacrylates (PEGDM) and their hydrogels are described. Combined analyses of 1H NMR and MALDI-TOF MS confirmed the formation of prepolymers of

Array Ordering in Dendritic Crystals and the Influence on Crystal Perfection

December 1, 2004
Author(s)
R E. Napolitano, David R. Black
In the work reported here, several important issues regarding the role of the evolving dendritic structure in the generation of crystal defects are investigated. Industrially produced single-crystal castings are examined, and the dendritic arrays are

Contact Damage in Brittle Coating Layers: Influence of Surface Curvature

December 1, 2004
Author(s)
T Qasim, M T. Bush, X Z. Hu, Brian R. Lawn
Fracture from indentation by a hard sphere on bilayer systems composed of curved brittle coating layers on compliant polymeric substrates is investigated, in simulation of dental crown structures. Glass plates 1 mm thick are used are used as representative

Competing Damage Modes in All-Ceramic Crowns: Fatigue and Lifetime

November 15, 2004
Author(s)
Yu Zhang, Brian R. Lawn
A study is made of fracture from cyclic loading of WC spheres on the surfaces of brittle layers on compliant substrates, as representative of repetitive occlusal contact on dental crowns. Several damage modes radial cracks at both top surface and
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