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Materials

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Displaying 1576 - 1600 of 2329

Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique

January 11, 2014
Author(s)
Edward J. Garboczi, Paul E. Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F. Plusquellic, Jack T. Surek, Sung Kim, Robert D. McMichael, Mark D. Stiles, Ahmed M. Hassan
Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectroscopic

Measurement and Simulation of Millimeter Wave Scattering Cross-sections from Steel-Reinforced Concrete

January 11, 2014
Author(s)
Ahmed M. Hassan, Edward Garboczi, Robert McMichael, Jack T. Surek, Mark D. Stiles, David F. Plusquellic, Virgil Provenzano, Paul E. Stutzman, Shuangzhen S. Wang, Sung Kim, Michael D. Janezic, Jason Coder, Nicos Martys, David R. Novotny
Some iron oxide corrosion products exhibit antiferromagnetic magnetic resonances (AFMR) at around 100 GHz at normal temperatures. AFMR can be detected in laboratory conditions, which serves as the basis for a new non-destructive spectroscopic method for

Fast Proton Conduction Facilitated by Minimum Water in a Series of Divinylsilyl-11-Silicotungstic Acid-co-Butyl Acrylate-co-Hexanediol Diacrylate Polymers

January 9, 2014
Author(s)
Lauren F. Greenlee, Andrew M. Herring, James L. Horan, Anitha Lingutla, Hui Ren, Mei-Chen Kuo, Sonny Sachdeva, Yuan Yang, Soenke Seifert, Michael A. Yandrasits, Steven J. Hamrock, Matthew H. Frey
Studies of proton transport in novel materials are important to enable a large array of electrochemical devices. In this study, we show that heteropoly acids (HPAs) when immobilized in polymer matrices have highly mobile protons. Divinyl-11-silicotungstic

Tunable electrical conductivity in metal-organic framework thin film devices

January 3, 2014
Author(s)
Albert A. Talin, Andrea Centrone, Alexandra C. Ford, Michael E. Foster, Vitalie Stavila, Paul M. Haney, Robert A. Kinney, Veronika Szalai, Farid El Gabaly, Heayoung Yoon, Francois Leonard, Mark Allendorf
We report a strategy for realizing tunable electrical conductivity in MOFs in which the nanopores are infiltrated with redox-active, conjugated guest molecules. This approach is demonstrated using thin-film devices of the MOF Cu3(BTC)2 (also known as HKUST

Thermodynamic modelling of liquids: CALPHAD approaches and contributions from statistical physics

December 20, 2013
Author(s)
Chandler A. Becker, J Agren, Marcello Baricco, Qing Chen, Sergei A. Decterov, Ursula R. Kattner, John Perepezko, Gernot Pottlacher, Malin Selleby
Here we describe current approaches to modelling liquids in CALPHAD. available experimental methods and results, and considerations in the use of molecular simulation and first-principles methods in thermodynamic modelling of liquids. We examine the two

Impact of UV Irradiation on the Surface Chemistry and Structure of Multiwall Carbon Nanotube Epoxy Nanocomposites

December 6, 2013
Author(s)
Elijah Petersen, Thomas F. Lam, Justin Gorham, Keana Scott, Chris Long, Deborah Jacobs, Renu Sharma, James Alexander Liddle, Tinh Nguyen
One of the most promising applications of nanomaterials is as nanofillers to enhance the properties of polymeric materials. However, the effect of nanofillers on polymers subject to typical environmental stresses, such as ultraviolet (UV) radiation, high

Dynamic contact AFM methods for nanomechanical properties

December 1, 2013
Author(s)
Donna C. Hurley, Jason P. Killgore
This chapter focuses on two atomic force microscopy (AFM) methods for nanomechanical characterization: force modulation microscopy (FMM) and contact resonance (CR) techniques. FMM and CR methods share several common features that distinguish them from

High-Temperature Electromechanical Properties of CTGS

December 1, 2013
Author(s)
Ward L. Johnson, Michal Schulz, Holger Fritze
CTGS (Ca3TaGa3Si2O14) is a commercially available, Czochralski-grown piezoelectric material from the langasite family that has an ordered crystal structure. It can be excited piezoelectrically up to at least 1285 °C, which is very close to the melting

Irreversible thermodynamics of creep in crystalline solids

November 15, 2013
Author(s)
Yuri Mishin, James A. Warren, Robert F. Sekerka, William J. Boettinger
We develop an irreversible thermodynamics framework for the description of creep deformation in crystalline solids by mechanisms that involve vacancy diffusion and lattice site generation and annihilation. The material undergoing the creep deformation is

What's in a Name

November 4, 2013
Author(s)
Ursula R. Kattner
In the early days of alloy phase diagrams phases were named using Greek letters in unary systems, from lower temperatures to higher temperatures, and in binary systems from the left to the right hand side of the system. This convenient convention allows

Airbrushed Nanofiber Scaffolds Support Bone Marrow Stromal Cell Differentiation

November 1, 2013
Author(s)
Carl G. Simon Jr., Wojtek J. Tutak, Sumona Sarkar, Tanya M. Farooque, Jyotsnendu J. Giri, Dongbo Wang, Sheng Lin-Gibson, Joachim Kohn, Durgadas Bolikal
Nanofiber scaffolds are effective for tissue engineering since they emulate the fibrous nanostructure of native extracellular matrix (ECM). Although electrospinning has been the most common approach for fabricating nanofiber scaffolds, airbrushing

An accelerated exposure and testing apparatus for building joint sealants

October 30, 2013
Author(s)
Christopher C. White, Donald L. Hunston, Kar T. Tan, John W. Hettenhouser, Jason D. Garver
The design, fabrication and implementation of a computer-controlled exposure and testing apparatus for building joint sealants are described in this paper. This apparatus is unique in its ability to independently control and monitor temperature, relative

Elasticity and rigidity percolation in networks of type-purified single-wall carbon nanotubes on flexible substrates

October 29, 2013
Author(s)
John M. Harris, JiYeon Huh, Matthew R. Semler, Christopher Stafford, Steven Hudson, Jeffrey Fagan, Erik K. Hobbie
Wrinkles and folds in compressed thin films of type-purified single-wall carbon nanotubes (SWCNTs) on polydimethylsiloxane (PDMS) substrates are used to study the mechanical response of pristine nanotube networks. While the low-strain plateau moduli are

Statistical Prediction of Sealant Modulus Change due to Outdoor Weathering

October 17, 2013
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Adam L. Pintar, James J. Filliben
Recently a statistically based model has been created to predict the change in modulus for a sealant exposed to outdoor weathering. The underlying high precision data supporting this model was obtained using the NIST SPHERE (Simulated Photo degradation by

Evaluating Fire Blocking Performance of Barrier Fabrics

October 15, 2013
Author(s)
Shonali Nazare, William M. Pitts, Shaun M. Flynn, John R. Shields, Rick D. Davis
The purpose of fire blocking barrier materials is to reduce the flammability of soft furnishings ( mattresses and upholstered furniture) by preventing or delaying direct flame impingement from open flames and/or heat transfer from smoldering ignition
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