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Displaying 1576 - 1600 of 1923

A Dielectric Slit Die for In-Line Monitoring of Polymer Compounding

April 1, 2004
Author(s)
Anthony J. Bur, S C. Roth, M M. McBrearty
The dielectric slit die is an instrument that is designed to measure electrical, rheological, ultrasonics, optical and other properties of a flowing liquid. In one application it is connected to the exit of an extrudder, pump or mixing machine that passes

Comparative Specular X-Ray Reflectivity, Positron Annihilation Lifetime Spectroscopy, and Incoherent Neutron Scattering Measurements of the Dynamics in Thin Polycarbonate Films

April 1, 2004
Author(s)
Christopher L. Soles, Jack F. Douglas, Wen-Li Wu, H G. Peng, D W. Gidley
The manner in which the dynamics of a polymer are affected by thin film confinement is one of technological significance, impacting thin film applications such as lubricants, adhesives, and chemically amplified photoresists. In this manuscript we use

Unusual Expansion and Contraction in Ultrathin Glassy Polycarbonate Films

April 1, 2004
Author(s)
Christopher L. Soles, Jack F. Douglas, Ronald L. Jones, Wen-Li Wu
The thermal expansion behavior and glass transitions of poly(styrene) (PS) and poly(methyl methacrylate) (PMMA) are extensively studied in the thin film geometry. Both PS and PMMA are similar in that they possess very low entanglement densities. In this

An Open Source Informatics System for Combinatorial Materials Research

March 1, 2004
Author(s)
Weiping Zhang, Michael J. Fasolka, Alamgir Karim, Eric J. Amis
Laboratory Research Informatics Systems (LRIS) hold great promise in streamlining research generally, and are particularly necessary for new data-intensive research strategies such as combinatorial and high-throughput approaches. In this talk, we describe

Energy Analysis of Multi-Lens Adhesion Measurements

March 1, 2004
Author(s)
Aaron M. Forster, Christopher Stafford, Alamgir Karim
The NIST Combinatorial Methods Center (NCMC) has adapted the Johnson Kendall, and Roberts (JKR) adhesive contact test for the development of a high-throughput adhesion measurement platform. This technique utilizes an array of hemispherical lenses to

Flow Simulation of a Microfluidic Analog of the Four-Roll Mill

March 1, 2004
Author(s)
Frederick R. Phelan Jr., Steven Hudson
The fluid dynamics of channel geometries for liquid state materials characterization in microfluidic devices are investigated using finite element flow simulation and flow classification criteria. A pressure driven microchannel device is sought that has an

MALDI of Layered Polymer Films

March 1, 2004
Author(s)
Barry J. Bauer, Kathleen M. Flynn, B D. Vogt
A layered preparation method is introduced that produces structured MALDI targets with well-defined phase sizes and compositions. Tri-a-naphthyl benzene is a glassy matrix that forms smooth films. It is layered with polystyrenes or polyethylene glycol

Synthesis and Characterization of PEG and PEG Urethane Dimethacrylate Hydrogels

March 1, 2004
Author(s)
Sheng Lin-Gibson, S Bencherif, James A. Cooper, N. R. Washburn, Joseph M. Antonucci
A key area in the repair and regeneration of tissues is optimizing the polymeric scaffold-tissue response. This study is designated to better understand the relationships between polymer matrix structure and properties to cell response. The current study

Combinatorial Techniques to Measure Curing of Epoxy Films

February 1, 2004
Author(s)
Aaron M. Forster, D Ragahavan, Naomi Eidelman, Alamgir Karim
Combinatorial methods were implemented in the investigation of time and temperature effects on epoxy curing by using three complementary techniques: axisymmetric adhesion testing, FT-IR reflectance mapping, and confocal fluorescence mapping to characterize

Development of a Combinatorial Rheometer for Polymer Formulations

February 1, 2004
Author(s)
H J. Walls, Robert F. Berg, Kathryn L. Beers, Eric J. Amis
Finding the best formulation for a new application, or fine-tuning an existing formulation to meet various customer needs, requires extensive sample preparation and testing. Our goal is to make this exploration more efficient for the property of viscosity

High Throughput Measurement of the Elastic Modulus of Polymer Thin Films

February 1, 2004
Author(s)
Christopher M. Stafford, A Chiche, D Julthongpiput, Michael J. Fasolka
Combinatorial and High Throughput (C&HT) methods combine clever experiment design, instrument automation, and computing tools to form a new paradigm for scientific research. Given this premise, the C&HT concept is being adapted to study problems in

High-Frequency Dielectric Relaxation in Trehalose-Glycerol Mixtures

February 1, 2004
Author(s)
O Anopchenko, Jan Obrzut, Bert W. Rust
Broadband dielectric measurements were performed on a series of trehalose-glycerol mixtures in a wide concentration range of glycerol and temperature swept from 220 K to 350 K. Relaxation spectra were obtained directly from the measured dielectric spectra

High-Throughput Adhesion Testing of Combinatorial Libraries With Multi-Lens Arrays

February 1, 2004
Author(s)
Aaron M. Forster, Wenhua Zhang, Christopher Stafford
The NIST Combinatorial Methods Center (NCMC) has adapted the Johnson, Kendall, and Roberts (JKR) test to develop a high-throughput adhesion measurement platform. Traditionally, the JKR test utilizes a single hemispherical lens compressed against (loading)

Investigations of Electrospray Sample Deposition for Polymer MALDI Mass Spectrometry

February 1, 2004
Author(s)
S D. Hanton, I Z. Hyder, J R. Stets, K G. Owens, William R. Blair, Charles M. Guttman, Anthony A. Giuseppetti
In the interest of more thoroughly understanding the relationship between sample preparation technique and spectra quality produced in Matrix-Assisted Laser Desorption/Ionization (MALDI) mass spectrometry, we have investigated details of the Electrospray

Quantitative Response Measurement of Cell Substrate Interactions via RT-PCR

February 1, 2004
Author(s)
Matthew Becker, L A. Bailey, Karen L. Wooley, J Kohn, Eric J. Amis, N Washburn
High-throughput metrologies for the rapid and systematic evaluation of synthetic materials, which would elucidate a candidate s potential biocompatibility, are needed. New synthetic methodologies have enabled a remarkable advance in the rational design of
Displaying 1576 - 1600 of 1923
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