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Topic Area: Materials Science

Displaying records 341 to 350 of 526 records.
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341. Quantifying Residual Stress in Nanoscale Thin Polymer Films via Surface Wrinkling
Topic: Materials Science
Published: 3/19/2009
Authors: Jun Y. Chung, Thomas Q. Chastek, Michael J Fasolka, Hyun W. Ro, Christopher M Stafford
Abstract: Residual stress, a pervasive consequence of solid materials processing, is stress that remains in a material after external forces have been removed. In polymeric materials, residual stress results from processes, such as film formation, that force ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902640

342. Measuring Photocatalytic Response of Metal Oxide Fillers in Polymeric Films Using Electron Paramagnetic Resonance Spectroscopy
Topic: Materials Science
Published: 3/18/2009
Authors: Stephanie S Watson, I-Hsiang Tseng
Abstract: Metal oxide fillers, such as titanium dioxide (TiO2), are heavily utilized in polymeric coatings and plastics for opacification, pigmentation, and mechanical enhancement. It is well known that the photoreactivity of TiO2 can contribute to the degrada ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902281

343. Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor
Topic: Materials Science
Published: 3/13/2009
Authors: Joseph M Antonucci, Anthony Albert Giuseppetti, Justin N.R. O'Donnell, Gary Edward Schumacher, Drago Skrtic
Abstract: Objective: To assess the effect of the cavity design factor (C-factor) on polymerization stress development (PSD) in resin composites. Methods: An experimental resin (BT resin) was prepared, which contained 2,2-bis[p-(2 hydroxy-3 -methacryloxypropoxy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900229

344. Structural Changes behind the Diffuse Dielectric Response in AgNbO3
Topic: Materials Science
Published: 3/13/2009
Authors: Igor Levin, Victor Lvovich Krayzman, Joseph C Woicik, J. Karapetrova, T. Proffen, M. G. Tucker, I. M. Reaney
Abstract: Structural changes among the so-called M-polymorphs of AgNbO3 were analyzed using combined high-resolution X-ray diffraction, neutron total scattering, electron diffraction, and X-ray absorption fine structure measurements. These polymorphs crystall ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901412

345. Adhesion Research at the National Institute of Standard and Technology (NIST)
Topic: Materials Science
Published: 3/11/2009
Authors: Donald Lee Hunston, Christopher M Stafford
Abstract: Over the years, NIST has been very active in adhesion research. Although there has never been an organizational group or large-scale program that focused specifically on this topic, a wide variety of projects have had adhesion, or related properties ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902030

346. Measurement of Dynamic Capillary Pressure and Viscosity via the Multi-Sample Micro-Slit Rheometer
Topic: Materials Science
Published: 3/6/2009
Authors: Doyoung Moon, Kalman D Migler
Abstract: We develop two direct methods to simultaneously measure the dynamic capillary pressure and the viscosity of fluids by application of differential forces during flow into micro-channels. In the first method, a series of external pressures is applied ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900211

347. Summary of Charpy Impact Verificaiton Data: 1994-1996
Topic: Materials Science
Published: 3/2/2009
Authors: Christopher N McCowan, C M Wang, D P Vigliotti
Abstract: We present a summary of Charpy impact verification test data that were evaluated by the National Institute of Standards and Tecnology (NIST) from January 1994 to December 1996. The Charpy impact machines that met the verification rule that limits th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851206

348. The molecular basis of mesophase ordering in a thiophene-based copolymer
Topic: Materials Science
Published: 2/18/2009
Authors: Dean M DeLongchamp, Regis J Kline, Youngsuk Jung, Eric K Lin, Daniel A Fischer, David J Gundlach, Andrew Moad, Lee J Richter, Michael F. Toney, Martin Heeney, Iain McCulloch
Abstract: The carrier mobility of poly(2,5-bis(3-alkylthiophen-2-yl) thieno[3,2-b]thiophene) semiconductors can be substantially enhanced after heating through a thermotropic mesophase transition, which causes a significant improvement in thin film structural ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852781

349. Adhesion at layer-by-layer surfaces in aqueous environments
Topic: Materials Science
Published: 2/15/2009
Authors: Adam J. Nolte, Jun Y. Chung, Marlon L Walker, Christopher M Stafford
Abstract: Adhesion between materials is often governed by the ambient environment, which can mediate or change the types of molecular interactions present at an interface. Biological interactions, for example, can be mediated by factors such as temperature, i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901360

350. High-throughput measurements of viscoelastic properties using surface indentation
Topic: Materials Science
Published: 2/15/2009
Authors: Peter M. Johnson, Christopher M Stafford
Abstract: Relaxation processes in viscous liquids and glasses have been studied extensively, but the underlying causes of glassy behavior in polymeric systems remains as a major unsolved area of condensed matter physics. These processes are critical in the de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901366



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