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Materials

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Displaying 651 - 675 of 2343

Promoting Persistent Superionic Conductivity in Sodium Monocarba-closo-dodecaborate NaCB11H12 via Confinement within Nanoporous Silica

July 26, 2021
Author(s)
Mikael Andersson, Vitalie Stavila, Alexander V. Skripov, Mirjana Dimitrievska, Malgorzata T. Psurek, Juscelino Leao, Olga Babanova, Roman Skoryunov, Alexei Soloninin, Maths Karlsson, Terrence J. Udovic
Superionic phases of bulk anhydrous salts based on large cluster-like polyhedral (carba)borate anions are generally stable only well above room temperature, rendering them unsuitable as solid-state electrolytes in energy-storage devices that typically

Atom probe tomography

July 22, 2021
Author(s)
Ann Chiaramonti Debay, Baptiste Gault, Julie Cairney, Michael P. Moody, Oana Cojocaru-Miredin, Patrick Stender, Renelle Dubosq, Christoph Freysoldt, Surendra Kumar Makineni, Tong Li
Atom probe tomography (APT) provides three-dimensional compositional mapping with sub-nanometre resolution. The sensitivity of APT is in the range of parts per million for all elements, including light elements such as hydrogen, carbon or lithium, enabling

Simulated filament shapes in embedded 3D printing

July 22, 2021
Author(s)
Leanne Friedrich, Jonathan Seppala
Embedded 3D printing, wherein fluid inks are extruded into a bath, has enabled the manufacture of complex, custom structures ranging from cell-laden tissue analogues to soft robotics. This method encompasses two techniques: embedded ink writing (EIW)

Fluorescence Microscopy Reveals Structure-Property Relationships and Polymer Dynamics in Biocomposites

July 21, 2021
Author(s)
Quinn Easter, Shawn Chen, Jeremiah Woodcock, Amanda Souna, Sindhu Seethamraju, Jan Obrzut, Douglas M. Fox, Stephan J. Stranick, Jeffrey Gilman
OBJECTIVES: Developing the next generation of materials for use in restorative work requires a multifaceted approach. While mimicking the properties of the tooth, currently available dental composites and porcelains eventually fail and require replacement

Microbial interactions with silicate glasses

July 17, 2021
Author(s)
Jamie Weaver, Carolyn Pearce, Robert Koestler, Bruce Arey, Albert Kruger, Paula DePriest, Andrew Plymale
Glass alteration in the presence of microorganisms has been a topic of research for over 150 years. Researchers from a variety of disciplines, including material science, biology, chemistry, geology, physics, and cultural heritage materials preservation

Density Functional Theory Study of the Structure of the Pillared Hofmann compound Ni(3-Methy-4,4'-bipyridine)[Ni(CN)4] (Ni-BpyMe or PICNIC 21)

July 14, 2021
Author(s)
Eric J. Cockayne, Winnie Wong-Ng, Yu-Sheng Chen, Jeffrey T. Culp, Andrew J. Allen
We use dispersion-corrected density functional theory (DFT) to investigate the structure of the pillared Hofmann compound Ni(3-Methy-4,4'-bipyridine)[Ni(CN)4] (NiBpyMe for short, or PICNIC 21). We model the disorder found in experimental X-ray structure

Broadband, High-Frequency Permittivity Characterization for Epitaxial Ba1-xSrxTiO3 Composition-Spread Thin Films

June 24, 2021
Author(s)
Eric J. Marksz, Aaron Hagerstrom, Jasper A. Drisko, James Booth, Nate Orloff, Xiaohang Zhang, Naila Al Hasan, Justin Pearson, Ichiro Takeuchi
Next-generation millimeter-wave (> 30 GHz) telecommunications electronics must be compact, energy efficient, and have good thermal management. Tunable materials may play a role in meeting these requirements for millimeter-wave front-ends, but there are few

Effects of aluminum content on thermoelectric performance of Al CoCrFeNi high-entropy alloys

June 15, 2021
Author(s)
Md Abdullah Al Hasan, Jiaqi Wang, Seungha Shin, Dustin A. Gilbert, Peter K. Liaw, Nan Tang, W. L. N. C. Liyanage, Louis Santodonato, Lisa Debeer-Schmitt, Nicholas Butch
Introducing a non-regular distribution in the mass and bonding by including distinctly different elements can reduce the phonon transport even within structurally well-ordered materials. These distributions are a quality of all high-entropy alloys (HEAs)

Preservative Induced Polysorbate 80 Micelle Aggregation

June 1, 2021
Author(s)
Peter H. Gilbert, Zhenhuan Zhang, Ken K. Qian, David P. Allen, Norman J. Wagner, Yun Liu
Small angle neutron scattering (SANS) studies of a model pharmaceutical formulation reveal how formulation stability depends on the compatibility of individual components. Solutions of two common protein formulation excipients, polysorbate 80 (PS80), a

Late Stage Domain Coarsening Dynamics of Lamellar Block Copolymers

May 26, 2021
Author(s)
Jack F. Douglas, Maninderjeet Singh, Wenjie Wu, Vinay Nuka, Joseph Strzalka, Alamgir Karim
Block copolymer (BCP) phase separation is an intriguing phenomenon whose dynamics can be expected to differ significantly from that of the polymer blends due to constraint of chain connectivity that limits the ultimate scale of phase separation and the

Fabrication of 3D Printed Hydroxyapatite Composite Scaffolds for Bone Regeneration

May 19, 2021
Author(s)
Yoontae Kim, Eun-Jin Lee, Albert Davydov, Stanislav Frakhtbeyen, Jonathan Seppala, Laurence Chow, Tagaki Shozo, Stella Alimperti
Additive biomanufacturing has been adapted in a wide variety of biomedical and tissue engineering applications, including orthopedics. The ability to print biocompatible, patient-specific geometries with controlled porosity, mechanical strength has made

Graded Magnetic Materials

May 17, 2021
Author(s)
Lorenzo Fallarino, Brian Kirby, Eric E. Fullerton
Graded magnetic materials represent a promising new avenue in modern material science from both fundamental and application points of view. Over the course of the last few years, remarkable results have been obtained in (epitaxial) heterostructures based

NIST Software Package for Obtaining Charpy Transition Curves

May 11, 2021
Author(s)
Enrico Lucon, Jolene D. Splett, Amanda Koepke, David Newton
NIST has developed a software package that allows users to fit test results obtained from Charpy or toughness tests as a function of test temperature, thereby obtaining so-called transition curves. Non-linear fitting is available for five regression models

Self-terminating Electrodeposition of Pt on WC Electrocatalysts

May 10, 2021
Author(s)
Thomas P. Moffat
Self-terminating electrochemical deposition is used to grow Pt nanoparticles on tungsten monocarbide (WC) from a pH 4 electrolyte containing 3 mmol/L K2PtCl4 - 0.5 mol/L NaCl. An unconventional potentiodynamic deposition program is used where nucleation is
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