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You searched on: Topic Area: Polymers

Displaying records 51 to 60 of 406 records.
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51. Freeform Fabricated Scaffolds with Roughened Struts that Enhance both Stem Cell Proliferation and Differentiation by Controlling Cell Shape
Topic: Polymers
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

52. A Robust and High-Throughput Measurement Platform for Monomer Reactivity Ratios from Surface-Initiated Polymerization
Topic: Polymers
Published: 2/23/2012
Authors: Kirt A. Page, Derek Patton, Emily Hoff, Michael J Fasolka, Kathryn L Beers
Abstract: This article describes a robust approach to measure monomer reactivity ratios from surface-initiated copolymerization, by measuring composition of statistical copolymer brush surfaces using x-ray photoelectron spectroscopy. Statistical copolymer br ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910460

53. Rippling Instability of Supported Polymer Nanolines
Topic: Polymers
Published: 2/21/2012
Authors: Vijaya R. Tirumala, Christopher M Stafford, Leonidas E. Ocola, Jack F Douglas, L. Mahadevan
Abstract: The swelling response of polymer line gratings supported on a rigid substrate has direct implications on their mechanical stability during pattern transfer in nanofabrication. The polymer lines, when swollen in a good solvent, undergo a rippling inst ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909469

54. DNA Molecules Descending a Nanofluidic Staircase by Entropophoresis
Topic: Polymers
Published: 1/26/2012
Authors: Samuel M Stavis, Jon C Geist, Michael Gaitan, Laurie E Locascio, Elizabeth A Strychalski
Abstract: A complex entropy gradient for confined DNA molecules was engineered for the first time. Following the second law of thermodynamics, this enabled the directed self-transport and self-concentration of DNA molecules. This new nanofluidic method is term ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908034

55. Mechanical Properties of Polymer Nano-Films
Topic: Polymers
Published: 11/28/2011
Authors: Junghyun Lee, Jun Y. Chung, Christopher M Stafford
Abstract: Three fundamental mechanical properties of supported glassy polystyrene films with thickness ranging from 250 nm to 9 nm were quantitatively determined by a recently developed wrinkling‹cracking method. Films below about 40 nm showed a decrease in bo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909417

56. Molecular Layer-by-Layer Deposition of Highly Crosslinked Polyamide Membranes for Reverse Osmosis Applications
Topic: Polymers
Published: 11/19/2011
Authors: Peter M. Johnson, Joonsung (Joonsung) Yoon, Jennifer Y. Kelly, 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

57. Impact of Chain Architecture (Branching) on the Thin Film Thermal and Mechanical Behavior of Polystyrene
Topic: Polymers
Published: 11/18/2011
Authors: Jessica M. Torres, Christopher M Stafford, David Uhrig, Vogt D Bryan
Abstract: The modulus and Tg of a series of PS samples with varying architecture are examined in thin films as a function of thickness. The bulk-like, thick film Tg is independent of polymer architecture: linear, comb, centipede and 4 armed star PS. However ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909204

58. Synthesis of Multifunctional Polymer Brushes via Sequential and Orthogonal Thiol-Click Reactions
Topic: Polymers
Published: 11/14/2011
Authors: Santosh B Rahane, Ryan M Hensarling, Bradley J Sparks, Christopher M Stafford, Derek L Patton
Abstract: Fabrication of multifunctional surfaces with complexity approaching that found in nature requires the application of a modular approach to surface engineering. We describe a versatile post-polymerization modification strategy to synthesize multifunc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909721

59. Influence of chain stiffness on thermal and mechanical properties of polymer thin films
Topic: Polymers
Published: 10/25/2011
Authors: Jessica M. Torres, Chengqing C. Wang, E. Bryan Coughlin, John P. Bishop, Richard A. Register, Robert A Riggleman, Christopher M Stafford, Bryan D. Vogt
Abstract: The effect of main chain stiffness and side chain flexibility on the elastic modulus and glass transition temperature (Tg) of thin polymer films is investigated using non-traditional polymers formed from 5-(2-phenylethylnorbornene). Depending on the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909043

60. Morphological Changes Driven by Nanofibrous Scaffolds Induce Marrow Stromal Cell Osteogenesis
Topic: Polymers
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



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