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Materials

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Displaying 976 - 1000 of 2328

Scaling Behavior of Anisotropy Relaxation in Deformed Polymers

September 11, 2018
Author(s)
Christopher N. Lam, Wen-Sheng Xu, Wei-Ren Chen, Zhe Wang, Christopher B. Stanley, Jan-Michael Y. Carrillo, David Uhrig, Weiyu Wang, Kunlun Hong, Yun Liu, Lionel Porcar, Changwoo Do, Gregory S. Smith, Bobby G. Sumpter, Yangyang Wang
Drawing an analogy to the paradigm of quasi-elastic neutron scattering, we present a general approach for quantitatively investigating the spatiotemporal dependence of structural anisotropy relaxation in deformed polymers by using small-angle neutron

Resolving Interfacial Charge Transfer in Titanate Superlattices using Resonant X-Ray Reflectometry

September 6, 2018
Author(s)
Ryan F. Need, P. B. Marshall, E. Weschke, Alexander J. Grutter, Dustin Allen Gilbert, E. Arenholz, P. Shafer, S. Stemmer, Stephen D. Wilson
Oxide interfaces, where strong electron-electron correlations lead to emergent phase behavior, have been the subject of intense study in recent years. However, the buried nature of heterointerfaces often makes them challenging to probe directly. Addressing

Strain-Induced Competition between Ferromagnetism and Emergent Antiferromagnetism in (Eu,Sr)MnO 3

September 4, 2018
Author(s)
Alexander J Grutter, Steven M. Disseler, E. J. Moon, Dustin Allen Gilbert, E. Arenholz, A. Suter, T. Prokscha, Z. Salman, Brian J Kirby, S. J. May
We demonstrate emergent antiferromagnetic interactions is strained thin films of the mixed valence manganite (Eu,SR)MnO 3. Although the composition studied, Eu 0.7Sr 0.3MnO 3, will nominally yield a ferromagnetic phase in bulk, we observe significant

High-efficiency Coherence-Preserving Harmonic Rejection with Crystal Optics

September 1, 2018
Author(s)
Fan Zhang, Andrew J. Allen, Lyle E. Levine, Gabrielle G. Long, Ivan Kuzmenko, Jan Ilavsky
We report a harmonic rejection scheme based on the combination of Si (111) monochromator and Si (220) harmonic-rejection crystal optics. This approach is of importance to a wide range of X- ray applications in all three major branches of modern X-ray

Protocols for Determining the Mechanical Properties of High Strength Copolymer Aramid Fibers

September 1, 2018
Author(s)
Amanda L. Forster, Viviana Rodriguez Cardenas, Ajay Krishnamurthy, Amy E. Engelbrecht-Wiggans, Zois Tsinas
The primary goal of the manuscript is to develop a protocol to prepare consistent specimens for accurate mechanical testing of high strength copolymer aramid fibers, by removing a coating and disentangling the individual fiber strands without introducing

SEIRAS Study of Chloride Mediated Polyether Adsorption on Cu

August 31, 2018
Author(s)
Thomas P. Moffat, Daniel Josell, Lee J. Richter
Surface enhanced infrared absorption spectroscopy (SEIRAS) was used to examine the co- adsorption of a selection of polyethers with Cl- under conditions relevant to superconformal Cu electrodeposition in CuSO4-H2SO4 electrolytes. In 0.1 mol/L H2SO4 a

Kinetic Separation of Propylene over Propane in a Microporous Metal-Organic Framework

August 30, 2018
Author(s)
Libo Li, Xiaoqing NMN Wang, Wei Zhou, Litao Jia, Banglin Chen
Propylene (C 3H 6)/propane (C 3H 8) separation is one of the most challenging as well as most energy-intensive separation processes in the petrochemical industry. Herein we report a microporous metal-organic framework ELM-12 with appropriate channels where

Nanoparticle Architecture Preserves Magnetic Properties during Coating to Enable Robust Multi-Modal Functionality

August 23, 2018
Author(s)
Lauren E. Woodard, Cindi L. Dennis, Julie Borchers, Anilchandra Attaluri, Esteban Velarde, Charlene Dawidczyk, Peter C. Searson, Martin G. Pomper, Robert Ivkov
Mixed metal/metal oxide nanoparticles offer potential as multifunctional platforms for disease diagnosis and therapy, or 'theranostics' [1-9]. We describe the synthesis and characterization of gold/silica/iron oxide core-shell nanoparticles, for which the

Complex coacervation in polyelectrolytes from a coarse-grained model

August 22, 2018
Author(s)
Jack F. Douglas, Marat Andreev, Juan J. DePablo, Vivek Prabhu, Matthew Tirrell
Polyelectrolyte coacervation refers to the formation of distinct liquid phases that arise when polyelectrolytes are mixed under appropriate polymer and salt concentrations. Molecular-level studies of complex polyelectrolyte coacervation have been limited

Fe 2 MnGe: A Hexagonal Heusler Analogue

August 20, 2018
Author(s)
S. Keshavarz, N. Naghibolashrafi, Michelle E. Jamer, K. Vinson, D. Mazumdar, Cindi L. Dennis, William D. Ratcliff, Julie Borchers, A. Gupta, P. LeClair
Fe 2MnGe is a potential half-metallic full-Heusler L2 1 ferromagnetic compound with large spin polarization (approximately equal}97%) useful for various spintronic applications according to our first principles calculations using density functional theory

Methane Storage in Paddlewheel-Based Porous Coordination Cages

August 18, 2018
Author(s)
Casey A. Rowland, Gregory R. Lorzing, Eric J. Gosselin, Benjamin Trump, Glenn P. A. Yap, Craig Brown, Eric D. Bloch
Although gas adsorption properties of extended three-dimensional metal-organic materials have been widely studied, they remain relatively unexplored in porous molecular systems. This is particularly the case for porous coordination cages which typically

In Situ Nanoscale Characterization of Water Penetration through Plasma Polymerized Coatings

August 1, 2018
Author(s)
Yang Zhou, Brian Patrick Josey, Emmanuel Anim-Danso, Brian B. Maranville, Jenia Karapetrova, Zhang Jiang, Qixin Zhou, Ali Dhinojwala, Mark D. Foster
The search continues for means of making quick determinations of the efficacy of a coating for protecting a metal surface against corrosion. One means of reducing the time scale needed to differentiate the performance of different coatings is to draw from

Aggregation and Solubility of a Model Conjugated Donor-Acceptor Polymer

July 31, 2018
Author(s)
Daniel R. Reid, Nicholas E. Jackson, Alexander J. Bourque, Chad R. Snyder, Ronald L. Jones, Juan de Pablo
In organic semiconductors, solution-phase polymer structure and aggregation have a strong influence on device morphology and performance. Thus, understanding solubility of conjugated polymers is crucial for their rational design. Using a combination of

Controllable Wide-range n- and p-Doping of Monolayer Group 6 Transition-metal Disulfides and Diselenides

July 30, 2018
Author(s)
Siyuan Zhang, Heather M. Hill, Curt A. Richter, Angela R. Hight Walker, Barlow Stephen, Seth Marder, Christina A. Hacker, Sujitra J. Pookpanratana
Developing processes to controllably dope transition-metal dichalcogenides (TMDs) is critical to achieving commercial integration for optical and electrical applications. In this study, molecular reductants and oxidants are introduced onto a series of

Mechanical Control of Crystal Symmetry and Superconductivity in Weyl Semimetal MoTe 2

July 30, 2018
Author(s)
Colin A Heikes, I Lin NMN Liu, Tristin Metz, Christoper Eckberg, Paul Michael Neves, Yan Wu, Linda NMN Hung, Phil Piccoli, Huibo Cao, Juscelino Leao, Johnpierre Paglione, Taner Yildirim, Nicholas P. Butch, William D. Ratcliff
The concept of topological order applied to condensed matter systems has inspired extensive experimental and theoretical searches for novel types of quantum matter. Topological superconductivity, where a bulk superconducting state and non-trivial topology
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