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Topic Area: Materials Science

Displaying records 71 to 80 of 430 records.
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71. Mechanical Properties of Polymer Nano-Films
Topic: Materials Science
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

72. Molecular Layer-by-Layer Deposition of Highly Crosslinked Polyamide Membranes for Reverse Osmosis Applications
Topic: Materials Science
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

73. Impact of Chain Architecture (Branching) on the Thin Film Thermal and Mechanical Behavior of Polystyrene
Topic: Materials Science
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

74. Minimizing damage during FIB-TEM sample preparation of soft materials
Topic: Materials Science
Published: 11/17/2011
Authors: Nabil Bassim, Bradley De Gregorio, A. D. Kilcoyne, Keana C k Scott, Tsngming Chou, S. Wirick, George Cody, Rhonda Stroud
Abstract: Although focused ion beam (FIB) microscopy has been used successfully for milling patterns and creating ultra-thin transmission electron microscopy (TEM) sections of polymers and other soft materials, little has been documented regarding FIB-induced ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907683

75. Synthesis of Multifunctional Polymer Brushes via Sequential and Orthogonal Thiol-Click Reactions
Topic: Materials Science
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

76. Influence of chain stiffness on thermal and mechanical properties of polymer thin films
Topic: Materials Science
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

77. In Situ Gas Phase Diagnostics for Titanium Nitride Atomic Layer Deposition
Topic: Materials Science
Published: 10/14/2011
Authors: James E Maslar, William Andrew Kimes, Brent A Sperling
Abstract: This report describes the performance of a technique for the simultaneous, rapid measurement of major gas phase species present during titanium nitride thermal atomic layer deposition involving tetrakis(dimethylamido) titanium (TDMAT) and ammonia. I ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909194

78. Morphological Changes Driven by Nanofibrous Scaffolds Induce Marrow Stromal Cell Osteogenesis
Topic: Materials Science
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

79. Molecular Order in High-Efficiency Polymer/Fullerene Bulk Heterojunction Solar Cells
Topic: Materials Science
Published: 9/22/2011
Authors: Matthew R. Hammond, Regis J Kline, Andrew A Herzing, Lee J Richter, David Germack, Hyun Wook Ro, Christopher L Soles, Daniel A Fischer, Tao Xu, Luping Yu, Michael F. Toney, Dean M DeLongchamp
Abstract: We report quantitative measurements of ordering, molecular orientation, and nanoscale morphology in the active layer of bulk heterojunction organic photovoltaic cells based on a thieno[3,4-b]thiophene-alt-benzodithiophene copolymer (PTB7), which has ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908836

80. SEM Induced Shrinking of Solid State Nanopores for Single Molecule Detection
Topic: Materials Science
Published: 9/22/2011
Authors: Anmiv Prahbu, Kevin J Freedman, Joseph William Robertson, Zhorro Nikolov, John J Kasianowicz, MinJun Kim
Abstract: We have investigated the shrinkage of solid state nanopores by a scanning electron microscope and find the process to be reproducible and dependant beam parameters such as the accelerating voltage and electron flux. The shrinking phenomenon does ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907430