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Materials

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Displaying 1301 - 1325 of 2329

DFT investigation of early stages of nanoindentation of Ni

June 23, 2016
Author(s)
Francesca M. Tavazza, Lyle E. Levine
Density functional theory simulations of diamond tips indenting Ni surfaces are used to study the early stages of nanoindentation. Numerous complex interactions are observed, including Ni-surface deformation during tip approach, the attachment and

Evolution of Dendrimer Conformational Structure with Generation Number

June 20, 2016
Author(s)
Beatriz A. Pazmino, Jack F. Douglas
We simulate the conformational structure of a coarse-grained model of dendrimer molecules in good solvent as a function of generation number G and find that they evolve through a substantially more complex structures than regular star polymer with

Kondo Effect in Magnetic Tunnel Junctions with an AIOx Tunnel Barrier

June 17, 2016
Author(s)
Chao Zheng, Robert D. Shull, Andrew P. Chen, Philip Pong
The Kondo effect in magnetic tunnel junctions (MTJs) is a result of the spin-exchange interaction between magnetic impurities and the conduction electrons. The presence of the Kondo effect can strongly influence the spin-dependent transport behavior of

Neutron Polarization Analysis for Biphasic Solvent Extraction Systems

June 16, 2016
Author(s)
Ryuhei Motokawa, Hitoshi Endo, Michihiro Nagao, William T. Heller
We performed neutron polarization analysis (NPA) of extracted organic phases containing complexes, comprised of Zr(NO 3( 4 and tri-n-butyl phosphate (TBP), to decompose the intensity distribution of small-angle neutron scattering (SANS) into the coherent

Certification of Standard Reference Material 1878b Respirable Alpha Quartz

June 9, 2016
Author(s)
David R. Black, Marcus H. Mendenhall, Pamela S. Whitfield, Donald A. Windover, Albert Henins, James J. Filliben, James P. Cline
The National Institute of Standards and Technology (NIST) certifies a suite of Standard Reference Materials (SRMs) to address specific aspects of the performance of X-ray powder diffraction instruments. This report describes SRM 1878b, the third generation

The 2015 Materials Science &Technology (MS&T15) Conference & Exhibition

June 8, 2016
Author(s)
Winnie Wong-Ng
The Materials Science &Technology 2015 Conference & Exhibition took place in the Greater Columbus Convention Center in Columbus, Ohio, from Oct 4 to 8. . It was co-sponsored by five leading materials engineering societies (the American Ceramic Society

Opportunities for Inverse Analysis in Dynamic Tensile Testing

June 6, 2016
Author(s)
Steven P. Mates, Fadi Abu-Farha
Dynamic tensile testing using Kolsky Bar methods are used to assess crashworthiness of new structural materials needed for lightweight automotive design. High speed Digital Image Correlation (DIC) measurements routinely show that the strain experienced by

In Situ Structural Characterization of Ageing Kinetics in Aluminum Alloy 2024 across Angstrom-to-Micrometer Length Scales

June 1, 2016
Author(s)
Fan Zhang, Lyle E. Levine, Andrew J. Allen, Carelyn E. Campbell, Adam Abel Creuziger, Nataliya Kazantseva, Jan Ilavsky
The precipitate structure and precipitation kinetics in an Al-Cu-Mg alloy (AA2024) aged at 190 °C, 208 °C, and 226 °C have been studied using ex situ TEM and in situ synchrotron-based, combined ultra-small angle X-ray scattering, small angle X-ray

MPInterfaces: A Materials Project based Python Tool for a High Throughput Computational Screening of Interfacial Systems

May 31, 2016
Author(s)
Arunima Singh, Kiran Mathew, Joshua Grabriel, Kamal Choudhary, Susan B. Sinnott, Albert Davydov, Francesca M. Tavazza, Richard G. Hennig
A Materials Project based open-source python tool, MPInterfaces, has been developed to automate the high throughput computational screening and study of interfacial systems. The framework encompasses creation and manipulation of interface structures for

Three-Phase Statistically Equivalent Periodic Unit Cells for Protein-Bound Soils

May 25, 2016
Author(s)
Edward Garboczi, Isamar Rosa, Michael Lepech, Henning Roedel, David Loftus
This work focuses on a novel class of composites that can be produced extraterrestrially, or in situ, by desiccating a mixture of soil, water, and protein binder to create a strong, versatile material. To date, experimental tests of mechanical properties

Modeling of Suspension Flow in a Pipe Geometry and Rheometers

May 18, 2016
Author(s)
Nicos Martys, Chiara F. Ferraris, William L. George
Abstract Measurement and prediction of the flow of suspensions like cement based materials represents a significant challenge for both the experimentalist and modeler. In this paper, results of a computational study of suspension flow in a pipe and a

Testing of Cementitious Materials Using a Dynamic MEMS Micro Rheometer

May 17, 2016
Author(s)
Yong Sik Kim, Nicholas G. Dagalakis, Chiara C. Ferraris, Nicos Martys
Incompatibility of cementitious materials with admixtures often requires time consuming testing. Usually, several mixtures need to be prepared either using concrete or paste to determine the optimum high range water reducer dosage (HRWRA) and type. The

Anomalously low magnetic damping of a metallic ferromagnet

May 16, 2016
Author(s)
Justin M. Shaw, Martin Schoen, Danny Thonig, Michael L. Schneider, Thomas J. Silva, Hans T. Nembach, Olle Eriksson, Olof Karis
The phenomenology of magnetic damping is of critical importance to devices which seek to exploit the electronic spin degree of freedom since damping strongly affects the energy required and speed at which a device can operate. However, theory has struggled

Elemental Sulfur and Molybdenum Disulfide Composites for Li-S Batteries with Long Cycle Life and High-Rate Capability

May 12, 2016
Author(s)
Vladimir P. Oleshko, Christopher L. Soles, Philip T. Dirlam, Jungjin Park, Adam G. Simmonds, Kenneth Domanik, Kookheon Char, Richard Glass, Nicola Pinna, Yung-Eun Sung
The development of next-generation battery systems beyond Li-ion technology remains a crucial challenge in accommodating the evolving energy storage demands presented by electric vehicles and efficient storage of energy from intermittent renewable sources
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