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Displaying 1601 - 1625 of 1923

Reaching Beyond Discovery

February 1, 2004
Author(s)
Eric J. Amis
Whatever you are trying to make, the choice of materials is often bewildering. Novel combinatorial approaches allow you to reduce the time and costs necessary to optimize results, while stimulating the quest for deeper fundamental knowledge.

Scattering Methods Applied to High Throughput Materials Science

February 1, 2004
Author(s)
A I. Norman, J Cabral, D L. Ho, Eric J. Amis, Alamgir Karim
Scattering methods have been employed to study the aqueous phase behavior of two low molecular weight diblock copolymers, EO(6)BO(11) and EO(18)BO(9), where EO denotes an ethyleneoxide unit and BO denotes a butyleneoxide unit. Depending on the lengths of

Significant Parameters in the Optimization of MALDI-TOF-MS

February 1, 2004
Author(s)
S Wetzel, Kathleen M. Flynn, James J. Filliben
One of the most significant issues in any analytical technique is optimization. Optimization and calibration are key factors in quantitation. In matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), one of the

Elastic Flow Instability in Nanotube Suspensions

January 1, 2004
Author(s)
Sheng Lin-Gibson, Jai A. Pathak, E A. Grulke, Haonan Wang, Erik K. Hobbie
We report an elastic instability associated with flow-induced clustering in non-Brownian colloidal nanotubes. Rheo-optical measurements are compared with recent simulations of mechanical flocculation in sheared fiber suspensions, and we observe an

High Throughput Measurements of Polymer Fluids for Formulations

January 1, 2004
Author(s)
Kathryn Beers, J Cabral, H J. Walls, Eric J. Amis
Rapid prototyping of microfluidic handling devices has gained popularity due to the ability to quickly test and modify new design features several times in one day. At the NIST Combinatorial Methods Center (NCMC), we have modified common microfluidic

International Interlaboratory Comparison of Mixtures of Polystyrenes With Different End Groups Obtained by Matrix Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF-MS): Preliminary Results

January 1, 2004
Author(s)
Charles M. Guttman, S Wetzel, Kathleen M. Flynn, B M. Fanconi, William E. Wallace, David L. VanderHart
NIST has sponsored a MALDI-TOF-MS interlaboratory comparison of mixtures of polymers of the same repeat unit with closely matching molecular masses but with different end groups. This interlaboratory comparison was designed to see how well a group of labs

Protein and Solvent Dynamics: How Strongly Are They Coupled?

January 1, 2004
Author(s)
G Caliskan, D Mechtani, J H. Roh, A Kisliuk, Alexei Sokolov, S Azzam, Marcus T. Cicerone, Sheng Lin-Gibson, I Peral
Analysis of Raman spectra of protein lysozyme demonstrates that its dynamics follow well the dynamics of solvents glycerol and trehalose. The protein s fast conformational fluctuations and low-frequency vibrations and their temperature variations are very

Recent Advances in Quantitative Synthetic-Polymer Mass Spectrometry at NIST

January 1, 2004
Author(s)
William E. Wallace, Charles M. Guttman
Commensurate with NIST s mission to advance the state of quantitative measurement science we have worked to develop a method to determine absolute molecular mass distribution of synthetic polymers by mass spectrometry. Work has centered on using matrix

Scattering Measurements for High Throughput Materials Science Research

January 1, 2004
Author(s)
A I. Norman, J Cabral, Alamgir Karim, Eric J. Amis
High throughput scattering methods are employed to study phase behavior over a concentration gradient of either Polystyrene (PS) in a Polystyrene/Polybutadiene (PS/PB) blend, or of diblock copoly(ethyleneoxide-butyleneoxide) in water. The combinatorial
Displaying 1601 - 1625 of 1923
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