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Materials

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Displaying 1176 - 1200 of 2363

Microstructure Knowledge Systems for Capturing Process-Structure Evolution Linkages

June 14, 2017
Author(s)
James A. Warren, Daniel Wheeler, David Brough, Surya Kalidindi
This paper develops and demonstrates a novel data science framework for capturing and communicating critical information regarding the evolution of material structure in spatiotemporal multiscale simulations of various processing operations employed by the

Zn-Se-Cd-S interlayer formation at the CdS/Cu2ZnSnSe4 thin-film solar cell interface

June 14, 2017
Author(s)
Marcus Baer, Ingrid Repins, Lothar Weinhardt, Jan Alsmeier, Sujitra Pookpanratana, Monika Blum, Wanli Yang, Clemens Heske, Regan Wilks, Rommel Noufi
The chemical structure of the CdS/Cu2ZnSnSe4 (CZTSe) interface was studied by a combination of different surface-sensitive and near-surface bulk-sensitive electron and x-ray spectroscopies. We find a CdS deposition-induced "redistribution" of elements in

Chamber for Mechanical Testing in H2 with Observation by Neutron Scattering

June 1, 2017
Author(s)
Matthew J. Connolly, Peter E. Bradley, Andrew J. Slifka, Elizabeth S. Drexler
A gas-pressure chamber has been designed, constructed, and tested at a moderate pressure (3.4 MPa, 500 psi) and has the capability of mechanical loading of steel specimens for neutron scattering measurements. The chamber will allow a variety of in situ

Advances in Next-Generation Polyolefin Standard Reference Materials

May 17, 2017
Author(s)
Sara V. Orski, Wesley S. Farrell, Andre M. Striegel, Kathryn L. Beers
NIST’s approach to modernizing its synthetic polymer reference materials is to target precise and robust synthetic methods, making homogeneous standards than can be easily tailored to include desired chemistry, molar mass, and topography. This strategy

A Microporous Hydrogen-Bonded Organic Framework with Amine Sites for Selective Recognition of Small Molecules

May 15, 2017
Author(s)
Hailong Wang, Hui Wu, Jinglan Kan, Ganggang Chang, Zizhu Yao, Bin Li, Wei Zhou, Shengchang Xiang, John Cong-Gui Zhao, Banglin Chen
A three-dimensional hydrogen-bonded organic framework (HOF-9) with suitable pore sizes and functional amine groups on the pore surfaces has been realized, exhibiting a highly selective recognition towards pyridine over BTX (BTX stans for benzene, toluene

Rheology of ballistic clay: the effect of temperature and shear history

May 9, 2017
Author(s)
Ran Tao, Kirk D. Rice, Aaron M. Forster
Ballistic clay is used as a backing material for standards-based ballistic resistance tests for the purposes of providing a measure of the energy transferred to the body when a threat is defeated. However, this material exhibits complex thermomechanical

Tuning Biocompatible Block Copolymer Micelles by Varying Solvent Composition: Core/Corona Structure and Solvent Uptake

May 4, 2017
Author(s)
Tyler J. Cooksey, Avantika Singh, Kim Mai Le, Shu Wang, Elizabeth Kelley, Lilin He, Sameer Vajjala Kesava, Enrique D. Gomez, Bryce E. Kidd, Louis A. Madsen, Megan L. Robertson
The structural properties and solvent uptake of biocompatible poly(ethylene oxide-b/}-ε-caprolactone) (PEO-PCL) diblock copolymers in deuterated water (D 2O)/tetrahydrofuran (THF d8) mixtures were investigated with a combination of small-angle neutron

Using Terahertz Waves to Identify the Presence of Goethite via Antiferromagnetic Resonance

April 24, 2017
Author(s)
Edward J. Garboczi, David F. Plusquellic, Robert D. McMichael, Virgil Provenzano, Paul E. Stutzman, Jack T. Surek, Shin G. Chou, Shuangzhen Wang
Virtually every corrosion detection method reports only the presence of a material phase denoting probable corrosion, not its spectral signature. A signature specific to the type of iron oxide corrosion would not only confirm the presence of corrosion but

Diffusion of water in silica in the absence of stresses

April 21, 2017
Author(s)
Sheldon M. Wiederhorn
In this paper we consider the diffusion of water vapour into silica glass at relatively low temperatures, 25°C to ≈500°C. Extensive studies of such diffusion by others have shown that water diffusion from inert gases behaves differently than diffusion from

CH3NH3PbI3 perovskites: Ferroelasticity revealed

April 14, 2017
Author(s)
Evgheni Strelcov, Qingfeng Dong, Tao Li, Jungseok Chae, Yuchuan Shao, Yehao Deng, Alexei Gruveman, Jinsong Huang, Andrea Centrone
Ferrolectricity has been proposed as a plausible meachanism to explain the high photovoltaic conversion efficiency in organic-inorganic perovskites; however, convincing experimental evidence in support to this hypothesis is still missing. Identifying and

Dielectric Characterization of Confined Water in Chiral Cellulose Nanocrystal Films

April 10, 2017
Author(s)
Bharath N. Natarajan, Caglar Emiroglu, Jan Obrzut, Douglas M. Fox, Beatriz Pazmino, Jack F. Douglas, Jeffrey W. Gilman
A known deterrent to a large scale development and use of cellulose nanocrystals (CNCs) is their affinity for moisture, which has a profound effect on dispersion, wetting, interfacial adhesion, matrix crystallization and water uptake. To quantify the

BC8 Silicon (Si-III) is a narrow-gap semiconductor

April 7, 2017
Author(s)
Haidong Zhang, Hanyu Liu, Kaya Wei, Oleksandr Kurakevych, Zhenxian Liu, Yann Godec, Joshua Martin, Michael Guerrette, George S. Nolas, Timothy A. Strobel
Large-volume, phase-pure synthesis of BC8 silicon (Ia3 ̅, cI16) has enabled bulk measurements of optical, electronic and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap

Small Particle Driven Chain Disentanglements in Polymer Nanocomposites

April 5, 2017
Author(s)
Erkan NMN Senses, Siyam M. Ansar, Christopher L. Kitchens, Yimin NMN Mao, Suresh Narayanan, Bharath NMN Natarajan, Antonio Faraone
Using neutron spin-echo spectroscopy, X-ray photon correlation spectroscopy and bulk rheology, we studied the effect of particle size on the single chain dynamics, particle mobility, and bulk viscosity in athermal polyethylene oxide-gold nanoparticle
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