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Displaying records 31 to 40 of 82 records.
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31. Nano-Apatitic Composite Scaffolds for Stem Cell Delivery and Bone Tissue Engineering
Topic: Advanced Materials
Published: 4/15/2012
Authors: Hockin H. K. Xu, Carl George Simon Jr.
Abstract: The need for bone defect repair and regeneration arises from trauma, disease, congenital deformity, and tumor resection. Bone fracture occurs to seven million people each year in the United States, and musculoskeletal conditions cost $215 billion ann ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904167

32. Photoiniated wrinkles with controlled morphology from a liquid coating on a rigid substrate: A facile route to tunable, periodic structures
Topic: Advanced Materials
Published: 3/27/2012
Authors: Jessica M. Torres, Christopher M Stafford, Vogt D Bryan
Abstract: Periodic wrinkled surfaces have generated significant interest over the past decade as these structures can be easily fabricated over large areas with minimal fabrication cost, but these structures have been generally been limited to thin films on so ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910420

33. 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

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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

40. 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



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