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Materials

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Displaying 851 - 875 of 2328

The Interfacial Zone in Thin Polymer Films and Around Nanoparticles in Polymer Nanocomposites

September 26, 2019
Author(s)
Jack F. Douglas, Wengang Zhang, Hamed Emamy, Fernando Vargas-Lara, Beatriz Betancourt, Francis W. Starr
We perform coarse-grained simulations of model unentangled polymer materials to quantify the range over which interfaces alter the structure and dynamics in the vicinity of the interface. We study both model polymer-nanoparticle (NP) composites with

A general approach to multicomponent metal-decorated crumpled reduced graphene oxide nanocomposites using a flame-based process

September 25, 2019
Author(s)
Mohammad M. Mohammadi, Shikuan Shao, Santosh S. Gunturi, Anirudh R. Raghavan, Naveshkaanth Alexander, Christopher Stafford, Raymond D. Buchner, Mark Swihart
A general approach to multicomponent metal-decorated crumpled reduced graphene oxide nanocomposites using a flame-based process Mohammad Moein Mohammadi1, Shikuan Shao1, Santosh Srivatsa Gunturi1, Anirudh Ravi Raghavan1, Naveshkaanth Alexander1

Effects of Al-Si Coating and Zn Coating on the Hydrogen Uptake and Embrittlement of Ultra-High Strength Press-Hardened Steel

September 25, 2019
Author(s)
Kyoung Rae Jo, Lawrence Cho, Dimas H. Sulistiyo, Eun Jung Seo, Seong Woo Kim, Bruno C. De Cooman
Press-hardened steel (PHS), used for automotive safety-related structure parts, is sensitive to hydrogen embrittlement due to its martensitic microstructure. Hydrogen is introduced in PHS during the hot press forming (HPF) process, by an atmospheric

Ultrathin Interfacial Layer with Suppressed Room Temperature Magnetization in Magnesium Aluminum Ferrite Thin Films

September 24, 2019
Author(s)
Jacob J. Wisser, Satoru Emori, Lauren Riddiford, Aaron Altman, Peng Li, Krishnamurthy Mahalingam, Brittany T. Urwin, Brandon M. Howe, Michael R. Page, Alexander Grutter, Brian Kirby, Yuri Suzuki
Low-damping magnetic oxide thin films with small thicknesses are essential for efficient insulator spintronic devices, particularly those driven by spin torques effects. Here, we investigate depth-resolved compositional and magnetic properties of epitaxial

Strain Shifts under Stress-controlled Oscillatory Shearing in Theoretical, Experimental and Structural Perspectives: Application to Probing Zero-Shear Viscosity

September 23, 2019
Author(s)
Johnny Ching-Wei Lee, Yu-Tong Hong, Kathleen Weigandt, Elizabeth Kelley, Hyunjoon Kong, Simon A. Rogers
Strain response under stress-driven oscillatory shearing could shift from the origin. The phenomenology is experimentally confirmed with entangled polymer-like micelles and polyethylene oxide solutions. A theory of strain shifting is provided based on the

Ceramic Materials and Powder Diffraction

September 15, 2019
Author(s)
Winnie K. Wong-Ng
Contrary to general public’s perception of ceramics as primarily encompassing art work, table ware, porcelain enamels, tiles, and sanitary ware, ceramics cover a broad range of materials and applications. We have attempted to categorize these materials in

John Werner Cahn

September 15, 2019
Author(s)
William J. Boettinger, C A. Handwerker, Frank W. Gayle
John Werner Cahn, retired Senior Fellow of the National Institute of Standards and Technology (NIST), died in Seattle, WA on March 14, 2016 at age 88. After distinguished careers at General Electric in Schenectady, N.Y. (1954-1964) and at MIT (1964-1978)

Molecular Partitioning in Ternary Solutions of Cellulose

September 15, 2019
Author(s)
Xin Zhang, Yimin NMN Mao, Madhu Sudan Tyagi, Feng Jiang, Doug Henderson, Bo Jiang, Zhiwei Lin, Ronald L. Jones, Liangbing Hu, Robert M. Briber, Howard Wang
Scattering measurements on the structure and dynamics of ternary solutions from dissolving microcrystalline cellulose (MC) in mixtures of ionic liquid (IL) and polar organic solvent have revealed dissolved cellulose molecular coils and partitioning of IL

Effect of Oxygen Stoichiometry on the Magnetization Profiles and Negative Magnetization in LSMO Thin Films

September 14, 2019
Author(s)
Robbyn Trappen, Alexander Grutter, Chih-Yeh Huang, Aubrey Penn, Navid Mottaghi, Saeed Yousefi, Allison Haertter, Shalini Kumari, James LeBeau, Brian Kirby, Mikel B. Holcomb
The depth dependent magnetization in thin film oxygen stoichiometric and oxygen deficient La 0.7Sr 0.3MnO 3 is investigated by using polarized neutron reflectivity. The stoichiometric sample shows enhanced interfacial magnetization relative to the rest of

Comparison of Anion and Cation Dynamics in a Carbon-Substituted closo-Hydroborate Salt: 1 H and 23 Na NMR Studies of Solid-Solution Na 2 (CB 9 H 10 )(CB 11 H 12 )

September 5, 2019
Author(s)
A. V. Soloninin, R. V. Skoryunov, O. A. Babanova, A. V. Skripov, Mirjana NMN Dimitrievska, Terrence J. Udovic
The hexagonal mixed-anion solid solution Na 2(CB 9H 10)(CB 11H 12) shows the highest room-temperature ionic conductivity among all known Na-ion conductors. To study the dynamical properties of this compound, we have measured ghe 1H and 23Na nuclear

Measurement of the 10B(?,n0)13N cross section at E? ? 3.6 MeV and its application as a diagnostic at the National Ignition Facilit

September 3, 2019
Author(s)
Q Liu, M Febbraro, R.J. deBoer, A Boeltzig, Y Chen, C Cerjan, M Couder, B Frentz, G Gilardy, J. Gorres, E. A. Henry, E. Lamere, K. T. Macon, K. Manukyan, L. Morales, P. D. O'Malley, S Pain, W. A. Peters, D. Schneider, C. Seymour, R. Toomey, B. Vande Kolk, Jamie Weaver, M. Wiescher
The National Ignition Facility provides the opportunity to study nuclear reactions under controlled conditions at high temperatures and pressures at a level never before achieved. However, the time scale of the DT implosion is only a few nanoseconds

The Interfacial Zone Around Nanoparticles in Polymer Nanocomposites

September 2, 2019
Author(s)
Jack F. Douglas, Beatriz Betancourt, Fernando Vargas-Lara, Francis W. Starr, Wengang Zhang
We perform coarse-grained simulations of model nanoparticles having a diameter on the order of 10 nm in an unentangled polymer matrix in the limit of low nanoparticle concentration to understand how the presence of nanoparticles alter the segmental

Thermal Stability of Titanium Contacts to MoS2

August 30, 2019
Author(s)
Huairuo Zhang, Albert Davydov, Leonid A. Bendersky, Keren M. Freedy, Stephen J. McDonnell
Thermal annealing of Ti contacts is commonly implemented in the fabrication of MoS2 devices however its effects on interface chemistry have not been previously reported in the literature. In this work, the thermal stability of titanium contacts deposited

Sequential and one-pot post-polymerization modification reactions of thiolactone-containing polymer brushes

August 19, 2019
Author(s)
Cassandra M. Reese, Brittany J. Thompson, Phillip K. Logan, Christopher Stafford, Derek L. Patton, Michael Blanton
Thiolactone chemistry has garnered significant attention as a powerful post-polymerization modification (PPM) route to mutlifunctional polymeric materials. Here, we apply this versatile chemistry to the fabrication of ultrathin, multifunctional polymer

Modification of Spin-Ice Physics in Ho 2 Ti 2 O 7 Thin Films

August 16, 2019
Author(s)
Kevin Barry, Biwen Zhang, Naween Anand, Yan Xin, Arturas Vailionis, Jennifer Neu, Colin A. Heikes, Charis Cochran, Haidong Zhou, Yiming Qiu, William D. Ratcliff, Theo Siegrist, Christianne Beekman
We report on a study of the structural and magnetic properties of strained Ho 2Ti 2O 7 thin films. Structural characterization via synchrotron x-ray diffraction confirms good crystallinity of our films and shows a critical thickness slightly below 50 nm

Engineered Sulfur-MoS2-Graphene Heterostructure Cathodes for Diagnostics of Nanoscale Electrochemical Processes in High Energy Density Li-S Batteries

August 5, 2019
Author(s)
Vladimir P. Oleshko, William R. McGehee, Saya Takeuchi, Siyuan Zhang, Andrei A. Kolmakov, Jabez J. McClelland, Christopher L. Soles
Lithium-sulfur (Li-S) batteries have recently attracted enormous attention because of high theoretical specific energy (2600 Wh kg-1) and high specific capacity (1672 mAhg-1), as well as the low cost, natural abundance, and nontoxicity of elemental sulfur

Quantification of a PbCl x Shell on the Surface of PbS Nanocrystals

August 5, 2019
Author(s)
Samuel W. Winslow, Yun Liu, James W. Swan, William A. Tisdale
Differences between the properties of PbS nanocrystals prepared using a large excess of PbCl 2 and those prepared using other Pb sources have led to speculation that a thin PbCl x shell may be present on the surface of PbCl 2-derived PbS nanocrystals
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