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Topic Area: Advanced Materials

Displaying records 21 to 30 of 69 records.
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21. Freeform Fabricated Scaffolds with Roughened Struts that Enhance both Stem Cell Proliferation and Differentiation by Controlling Cell Shape
Topic: Advanced Materials
Published: 3/1/2012
Authors: Girish Kumar, Carl George Simon Jr, Michael S. (Michael Stephan) Waters, Tanya M. Farooque, Marian F Young
Abstract: We demonstrate that imparting freeform fabricated (FFF) scaffolds with surface roughness on their struts enhances osteogenic differentiation of primary human bone marrow stromal cells (hBMSCs) by controlling cell shape. Previous work showed that hBM ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910664

22. Ultra-small-Angle X-ray Scattering ‹ X-ray Photon-Correlation Spectroscopy Studies of Incipient Structural Changes in Amorphous Calcium Phosphate Based Dental Composites
Topic: Advanced Materials
Published: 2/28/2012
Authors: Fan Zhang, Andrew John Allen, Lyle E Levine, Laura Espinal, Joseph M Antonucci, Drago Skrtic, Justin N.R. O'Donnell, Jan Ilavsky
Abstract: The local structural changes in amorphous calcium phosphate (ACP) based dental composites were studied upon heating using both static, bulk measurement techniques and recently developed ultra-small angle X-ray scattering ‹ X-ray photon correlation sp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906876

23. Control of Molecular Mass Distributions in Enzymatic Lactone Polymerizations
Topic: Advanced Materials
Published: 2/2/2012
Authors: Santanu S. Kundu, Peter M. Johnson, Kathryn L Beers
Abstract: Using a model developed for the enzyme catalyzed polymerization and degradation of poly(caprolactone), we illustrate methods and the kinetic mechanisms necessary to improve molecular mass distributions by manipulating equilibrium reactions in the kin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909997

24. Low Force AFM Nanomechanics with Higher-Eigenmode Contact Resonance Spectroscopy
Topic: Advanced Materials
Published: 1/11/2012
Authors: Jason Philip Killgore, Donna C. Hurley
Abstract: Atomic force microscopy (AFM) methods for quantitative measurements of elastic modulus on stiff (>10 GPa) materials typically require tip-sample contact forces in the hundreds of nanonewton to few micronewton range. Such large forces can incur sa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909735

25. Automated Data Processing and Quantification in Polymer Mass Spectrometry
Topic: Advanced Materials
Published: 12/1/2011
Authors: Till Gruendling, Christopher Barner-Kowollik, William E Wallace III, Charles Martin Guttman, Anthony J Kearsley
Abstract: An overview is given of some new techniques in quantitative composition and molecular mass distribution measurement of synthetic polymers by mass spectrometry. New concepts in data analysis, including peak picking and integration, are also described ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907901

26. Molecular Layer-by-Layer Deposition of Highly Crosslinked Polyamide Membranes for Reverse Osmosis Applications
Topic: Advanced Materials
Published: 11/19/2011
Authors: Peter M. Johnson, Joonsung (Joonsung) Yoon, Jennifer Y. Kelly, John A. (John A) Howarter, Christopher M Stafford
Abstract: In membranes for reverse osmosis and nanofiltration, the discriminating layers consist of an interfacially polymerized polyamide film on a porous support. For reverse osmosis membranes, the dominant commercial interfacial film is a crosslinked netwo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908946

27. Self-Repairing Complex Helical Columns Generated via Kinetically Controlled Self-Assembly of Dendronized Perylene Bisimides
Topic: Advanced Materials
Published: 11/16/2011
Authors: Virgil Percec, Steven D Hudson, Mihai Peterca, Pawaret Leowanawat, Emad Aqad, Robert Graf, Hans -W Spiess, Xiangbing Zeng, Goran Ungar, Paul A Heiney
Abstract: The dendronized perylene 3,4:9,10-tetracarboxylic acid bisimide (PBI) (3,4,5)12G1-3-PBI was recently shown to self-assemble in a complex helical column containing tetramers of PBI as the basic repeat unit. The tetramers contain a pair of two molecule ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909636

28. Synthesis of Polymer-derived Ceramic Si(B)CN-Carbon Nanotube Composite by Microwave Induced Interfacial Polarization
Topic: Advanced Materials
Published: 10/12/2011
Authors: Romil Bhandavat, William Kuhn, Elisabeth Mansfield, John H Lehman, Gurpreet Singh
Abstract: We demonstrate synthesis of a polymer-derived ceramic (PDC)-multiwall carbon nanotube (MWCNT) composite using microwave irradiation at 2.45 GHz. The process takes about 10 minutes of microwave irradiation for the polymer to ceramic conversion. The su ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909564

29. Morphological Changes Driven by Nanofibrous Scaffolds Induce Marrow Stromal Cell Osteogenesis
Topic: Advanced Materials
Published: 10/11/2011
Authors: Carl George Simon Jr, Kaushik Chatterjee, Christopher K. Tison, Girish Kumar, Patrick S Pine, Marc L Salit, Jennifer H McDaniel, Marian F Young
Abstract: Cells are sensitive to tissue scaffold architecture and these cell-material interactions drive cell functions critical in tissue regeneration. Results presented here demonstrate that nanofiber scaffolds force primary human bone marrow stromal cells ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908027

30. Weibull Regression Analysis of Filtered Surface Roughness Data and Strain Prediction in a Metallic Alloy
Topic: Advanced Materials
Published: 7/1/2011
Authors: Joseph Bunton Hubbard, Mark R Stoudt, Antonio M Possolo
Abstract: We fit a two-parameter Weibull regression (WR) model by maximum likelihood estimation (MLE) to filtered surface roughness data. These data were acquired by scanning confocal laser microscopy performed on aluminum alloy AA5754-O surfaces that were su ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901996



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