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Displaying 851 - 875 of 1728

Raman Spectroscopic Monitoring of Droplet Polymerization in a Microfluidic Device

September 1, 2006
Author(s)
Susan E. Barnes, Zuzanna T. Cygan, Kathryn Beers, Eric J. Amis, Jesse K. Yates
Thiolene based microfluidic devices were used to generate droplets of benzyl methacrylate monomer and hexanediol dimethacrylate crosslinker mixtures suspended in a water/surfactant continuous phase. A gradient of droplet composition was established and the

Encapsulated Chondrocyte Response to Pulsatile Flow Bioreactor

August 16, 2006
Author(s)
James A. Cooper, W Li, L A. Bailey, Steven D. Hudson, Sheng Lin-Gibson, Kristi S. Anseth, Rocky Tuan, N Washburn
We have developed a bioreactor using microfluidic techniques that allow for dynamic culture conditions and measurement of the fluid flow impinging upon a three-dimensional (3-D) tissue engineering (TE) scaffold. Chondrocytes in scaffolds have been shown to

Anti-Biofouling Properties of Comb-Like Block Copolymer With Amphiphilic Side-Chains

August 11, 2006
Author(s)
Sitaraman Krishnan, R Ayothi, A Hexemer, J Finlay, K E. Sohn, R Perry, Christopher K. Ober, E J. Kramer, M E. Callow, J A. Callow, Daniel A. Fischer
Surfaces of novel block copolymers with amphiphilic side chains were studied for adhesion of marine organisms. the surface-active polymer, obtained by grafting fluorinated molecules with hydrophobic and hydrophilic blocks to a block copolymer precursor

Subsolidus Phase Equilibria and Properties in the Magnetic Dielectric System Bi 2 O 3 :Mn 2 O 3+x :Nb 2 O 5

July 20, 2006
Author(s)
Terrell A. Vanderah, M W. Lufaso, A U. Adler, Igor Levin, Juan C. Nino, Virgil Provenzano, Peter K. Schenck, Robert S. Roth
Subsolidus phase relations have been determined for the Bi-Mn-Nb-O system in air (750-900 C). Phases containing Mn2+, Mn3+, and Mn4+ were all observed. Ternary compound formation was limited to pyrochlore, which formed a substantial solid solution region

Elastic Moduli of Ultrathin Amorphous Polymer Films

July 1, 2006
Author(s)
Christopher Stafford, C Harrison, D Julthongpiput, B D. Vogt
The elastic moduli of ultrathin poly(styrene) and poly(methylmethacrylate) films of thickness ranging from 200 nm to 5 nm were investigated using a buckling-based metrology. Below 40 nm, the apparent modulus of the PS and PMMA films decreases dramatically

Growth of Nanocrystalline Ceria Studied Using a USAXS Capillary Flow-Cell

July 1, 2006
Author(s)
Vincent A. Hackley, Andrew J. Allen, P R. Jemian, J M. Raitano, S W. Chan
Nanocrystalline ceria particles, with dimensions as small as 2 nm, have been prepared at room temperature by a soft chemical route using aqueous cerium nitrate and hexamethylenetetramine (HMT) as reactants. HMT decomposes slowly in aqueous solution

X-Ray Topography for Fractography of Single-Crystal Components

June 15, 2006
Author(s)
David R. Black, George D. Quinn
X-ray diffraction topography, which is sensitive to local strain and/or crystallographic orientation, provides a unique view of single-crystal samples both before and after fracture. It can find strength and performance limiting surface and subsurface

Soft X-Ray Absorption Spectroscopy of the MgB 2 Boron K Edge in an MgB 2 /Mg Composite

June 8, 2006
Author(s)
Daniel A. Fischer, A R. Moodenbaugh, Q Li, G Gu, Y Zhu, J W. Davenport, D O. Welch, H Su
Soft x-ray absorption (XAS), using fluorescence yield, was used to study the boron K near edge in MgB2 superconductor. The sample consists of MgB2 crystallites randomly oriented in a magnesium matrix. Abrasion of the sample surface in vacuum provides a
Displaying 851 - 875 of 1728
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