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Displaying records 41 to 50 of 74 records.
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41. 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

42. 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

43. 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

44. 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

45. Self-Assembly of Dendronized Perylene Bisimides into Complex Helical Columns
Topic: Advanced Materials
Published: 6/24/2011
Authors: Virgil Percec, Mihai Peterca, Timur Tadjiev, Xiangbing Zeng, Goran Ungar, Pawaret Leowanawat, Emad Aqad, Mohammad Imam, Brad Rosen, Umit Akbey, Robert Graf, Sivakumar Sekharan, Daniel Sebastiani, Hans -W Spiess, Paul A Heiney, Steven D Hudson
Abstract: The synthesis of perylene 3,4:9,10-tetracarboxylic acid bisimides (PBIs) dendronized with first generation dendrons containing 0 to 4 methylenic units (m) between the imide group and the dendron, (3,4,5)12G1-m-PBI, is reported. Structural analysis of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908817

46. Characterization of the First Order Nonlinear Stiffened Elasticity of the Piezoelectric Layer in Bulk Acoustic Wave Resonators
Topic: Advanced Materials
Published: 5/1/2011
Authors: Juan C. Collado Gomez, Eduard Rocas, Jordi Mateu, Nathan D Orloff, James C Booth, Alberto Padillo, Juan Callaghan
Abstract: This work proposes a procedure to characterize the intrinsic nonlinearities of bulk acoustic wave resonators by performing one port measurements of the second harmonic and second order intermodulation spurious signals. Closed-form expressions have be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905738

47. Combinatorial Screening of Osteoblast Response to 3D Nano-Composite Tissue Scaffolds Using Gradients and Arrays
Topic: Advanced Materials
Published: 4/24/2011
Authors: Carl George Simon Jr., Kaushik Chatterjee, Limin Sun, Laurence Chung Lung Chow, Marian F Young
Abstract: Current methods for combinatorial and high-throughput (CHT) screening of cell-material interactions utilize a two-dimensional (2D) format where cells are presented on flat materials surfaces [1]. However, cell response in 3D scaffolds is more represe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907330

48. Effect of 3D Scaffold Structure on Osteogenic Differentiation of Human Bone Marrow Stromal Cells
Topic: Advanced Materials
Published: 4/24/2011
Authors: Carl George Simon Jr., Girish Kumar, Marian F Young
Abstract: Structural properties of polymeric scaffolds for tissue engineering play a key role in directing osteogenesis. These properties depend on the chemical nature and the fabrication process of biomaterial. There are many protocols for fabricating scaff ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907329

49. NIST Reference Material Scaffolds Characterized for Cell Response
Topic: Advanced Materials
Published: 4/24/2011
Authors: Carl George Simon Jr., Jeff M Coles
Abstract: Reference scaffolds characterized for cell response are being developed for use as a standard for biological characterization of new scaffolds. The need for reference scaffolds to serve as a calibration standard between labs has been identified as c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907327

50. Nanofiber Scaffolds Induce Morphological Changes in hBMSCs Critical for Osteogenic Differentiation
Topic: Advanced Materials
Published: 4/24/2011
Authors: Carl George Simon Jr., Girish Kumar, Christopher K. Tison
Abstract: Utilizing tissue scaffold architecture to induce stem cell differentiation is of tremendous importance to the regenerative medicine community. To this end, we have investigated the effect of nanofiber scaffold structure on primary human bone marrow s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907328



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