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Displaying 601 - 625 of 1721

Effects of filler type and content on mechanical properties of photopolymerizable composites determined using a two-dimensional gradient platform

February 5, 2009
Author(s)
Sheng Lin-Gibson, Li Piin Sung, Haiqing Hu, Aaron M. Forster, Nancy J. Lin
Photopolymerizable dental composites have complex processing conditions and multi-component formulations that affect the final properties. Combinatorial screening is a useful approach for evaluating multiple properties of the composites. A single test

Synthesis and Transport Properties of Framework-Substituted Cs 8 Na 16 Cu 5 Ge 131

January 13, 2009
Author(s)
Matthew Beekman, James A. Kaduk, J Gryko, Winnie Wong-Ng, Alexander J. Shapiro, George S. Nolas
We report the synthesis and temperature dependent transport properties of a new type II germanium clathrate, Cs8Na16Cu5Ge131 (space group Fd3m; a = 15.42000(9) ) . In comparison to the parent compound Cs8Na16Ge136, Cu substitution for Ge on the clathrate

Measurement of Axisymmetric Crystallographic Texture

January 1, 2009
Author(s)
Mark D. Vaudin
Crystallographic texture has for many years been the fiefdom of metallurgists and geologists, who have developed elegant methodologies for the analysis of highly complex textures and texture evolutions. Over the past two decades, the importance and

MATRIX RELAXATION AFTER FRACTURE IN A TOUGHENED EPOXY

December 10, 2008
Author(s)
Aaron M. Forster, Cyril Clerici, Donald L. Hunston
An efficient method to increase the Mode I fracture energy of a polymer adhesive is to incorporate a rubbery phase within the glassy matrix. In general, the failure surface of a toughened polymer is characterized by cavitated rubber particles and plastic

Designing artificial cells to harness the biological ion gradient

November 23, 2008
Author(s)
Jian Xu, David A. LaVan
Cell membranes contain numerous natural nanoscale conductors, i.e. ion channels and ion pumps1-4, that work in concert to form transmembrane or transcellular ion gradients that can be triggered to release an action potential (AP)1, 5. Can artificial cells

Beta-Sheet Formation and RGD-Presentation Effects on Osteoblast Differentiation

November 15, 2008
Author(s)
Carl G. Simon Jr., Matthew Becker, Sheng Lin-Gibson, Kristen E. Roskov, David L. Kaplan, Abby W. Morgan
This report highlights our recent investigation into -sheet formation and RGD epitope presentation on the surface of blended silk films.1 Surface characterization of biomaterials for tissue engineering applications is of great importance to understand how

Electronic Structure and Chemistry of Iron-Based Metal Oxide Nanostructured Materials: A NEXAFS Investigation of BiFeO3, Bi2Fe4O9, a-Fe2O3, g-Fe2O3, and Fe/Fe3O4

November 6, 2008
Author(s)
Tae-Jin Park, S Sambasivan, Daniel A. Fischer, R Ramesh, J A. Misewich, S S. Wong
We present a systematic and detailed Near Edge X-ray Absorption Fine Structure (NEXAFS) experimental investigation of the electronic structure and chemistry of iron-based metal oxide nanostructured (FeMONS) materials including BiFeO3, Bi2Fe4O9, a-Fe2O3, ?-

Gradient Nanofiber Scaffold Libraries for Tissue Regeneration by Electrospinning

October 15, 2008
Author(s)
Carl G. Simon Jr., Murugan Ramalingam, Marian F. Young, Vinoy Thomas
Functional tissue engineering is a rapidly emerging biomedical field that holds great potential for healthcare in addressing the gap between need and availability of donor tissues and organs. The dogma in the field of tissue engineering is to harvest a

Impact of Sucrose Level on Storage Stability of Proteins in Freeze-Dried Solids: II. Correlation of Aggregation Rate with Protein Structure and Molecular Mobility

October 13, 2008
Author(s)
Bingquan S. Wang, Serguei Tchessalov, Marcus T. Cicerone, Nicholas W. Warne, Michael Pikal
The purpose of this study is to investigate the impact of sucrose level on storage stability of dried proteins and thus better understand the mechanism of protein stabilization by disaccharides in lyophilized products. Three IgG1 fusion proteins and two

Multi-sample micro-slit rheometry

September 17, 2008
Author(s)
Doyoung Moon, Anthony J. Bur, Kalman D. Migler
We have developed a multi-sample micro-slit rheometer MMR which is capable of measurements over a broad range of temperatures, viscosities and shear rates. The instrument is mechanically simple as the flow is generated by external gas pressure and the

Characterization of Laminin on Silanized Polydimethylsiloxane

August 21, 2008
Author(s)
Joy P. Dunkers, Lisa M. Hughes, Hae-Jeong Lee, Marvi Matos, Marcus T. Cicerone
In this work, we characterize a protein surface on a flexible polydimethylsiloxane substrate (PDMS) capable of undergoing strain. We compare the results from two different surface treatments: physically adsorbed laminin on PDMS and laminin deposited on

Characterization of Monolayer Formation on Aluminum-Doped Zinc Oxide Thin Films

August 21, 2008
Author(s)
C Rhodes, S E. Lappi, Daniel A. Fischer, S Sambasivan, Jan Genzer, S Franzen
The optical and electronic properties of aluminum-doped zinc oxide (AZO) thin films on a glass substrate have been investigated experimentally and theoretically. Optical studies with coupling in the Kretschmann configuration reveal an angle-dependent

Magnetic Resonance Microscopy of Collagen Mineralization

August 1, 2008
Author(s)
Ingrid E. Chesnick, Jeffrey T. Mason, Anthony A. Giuseppetti, Naomi Eidelman, Kimberlee Potter
A model mineralizing system was subjected to magnetic resonance microscopy (MRM), to investigate how water proton transverse (T2) relaxation times and magnetization transfer ratios (MTRs) can be applied to monitor collagen mineralization. In our model

Nature of Transition Layers at the SiO 2 /SiC Interface

July 14, 2008
Author(s)
T Zheleva, Aivars Lelis, G Duscher, F Liu, Igor Levin, M Das
Electrical performance of SiC-based microelectronic devices is strongly affected by the densities of interfacial traps introduced by the chemical and structural changes at the SiO2/SiC interfaces during processing. We analyzed the structure and chemistry

Roughness-Induced Superhydrophobicity: A Way to Design Non-Adhesive Surfaces

July 4, 2008
Author(s)
Michael Nosonovsky, Bharat Bhushan
Non-adhesive and water-repellent surfaces are required for many tribological applications. Roughness-induced superhydrophobicty has been suggested as a way to reduce adhesion and stiction. In this paper, the theory of roughness-induced superhydrophobicity
Displaying 601 - 625 of 1721