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Displaying 851 - 875 of 2347

Chalcogenide Topological Insulators

November 15, 2019
Author(s)
Joseph A. Hagmann
The purpose of this chapter is to introduce the reader to the chalcogenide materials systems that host the topological insulator phase of quantum matter. Specifically, the HgTe quantum well 2D topological insulator system and the V2VI3-type bismuth- and

Enhanced Gas Uptake in a Microporous Metal-Organic Framework via a Sorbate Induced-Fit Mechanism

November 13, 2019
Author(s)
Mei-Hui Yu, Brian Space, Douglas Franz, Wei Zhou, Chaohui He, Libo Li, Rajamani Krishna, Ze Chang, Wei Li, Tong-Liang Hu, Xian-He Bu
Physical adsorption of gas molecules in microporous materials is an exothermic process, with desorption entropy driving a decrease in uptake with temperature. Enhanced gas sorption with increasing temperature is rare in porous materials and is indicative

Tailoring the Pore Geometry and Chemistry in Microporous Metal-Organic Frameworks for High Methane Storage Working Capacity

November 13, 2019
Author(s)
Kai Shao, Jiyan Pei, Jia-Xin Wang, Yu Yang, Yuanjing Cui, Wei Zhou, Taner N. Yildirim, Bin Li, Banglin Chen, Guodong Qian
We realize that tailoring pore size/geometry and Chemistry, by virture of alkynl or naphthalene replacing phenyl within a series of isomorphic MOFs, can optimize methane storage working capacities, affording an exceptionally high working capacity of 203 cm

Recent trends in crystallography a current IUCr journals perspective

November 1, 2019
Author(s)
Andrew J. Allen
The International Union of Crystallography (IUCr) publishes papers in nine scientific journals, including its high-impact, cross-cutting open-access journal, IUCrJ, plus its data publication, IUCrData. Where are these papers cited? To what degree are

Reversible Epitaxial Electrodeposition of Metals in Battery Anodes

November 1, 2019
Author(s)
Jingxu Zheng, Qing Zhao, Tian Tang, Jiefu Yin, Calvin D. Quilty, Genesis D. Renderos, Xiaotun Liu, Yue Deng, Lei Wang, David C. Bock, Cherno Jaye, Esther S. Takeuchi, Kenneth J. Takeuchi, Amy C. Marschilok, Lynden A. Archer
The propensity of metals to form irregular and non-planar electrodeposits at liquid/solid interfaces has emerged as a fundamental barrier to high-energy, rechargeable batteries that utilize metal anodes. We report an epitaxial mechanism to regulate

Effect of Flexibility and Nanotriboelectrification on the Dynamic Reversibility of Water Intrusion into Nanopores: Pressure-Transmitting Fluid with Frequency-Depending Dissipation Capability

October 30, 2019
Author(s)
Alexander Lowe, Nikolay Tsyrin, Miroslaw Chorazewski, Pawel Zajdel, Michal Mierzwa, Juscelino Leao, Markus Bleuel, Tong Feng, Dong Luo, Mian Li, Dan Li, Victor Stoudenets, Sebastian Pawlus, Abdessamad Faik, Yaroslav Grosu
In this work the effect of a porous material´s flexibility on the dynamic reversibility of a non-wetting liquid intrusion was explored experimentally. For this purpose, high-pressure water intrusion together with high-pressure in-situ small angle neutron

Tunable Magnetic Ordering through Cation Selection in Entropic Spinel Oxides

October 21, 2019
Author(s)
Brianna Musico, Quinton Wright, T. Zac Ward, Alexander Grutter, Elke Arenholz, Dustin Gilbert, David Mandrus, Veerle Keppens
Twelve multicomponent spinels, comprised of (Mg, Cr, Mn, Co, Fe, Ni, Cu, and/or Zn)(Cr, Fe or Al) 2O 4, were prepared using solid state synthesis methods, resulting in nine homogenous, single phase samples with a Fm-3m structure, and three samples with

Orientational Distribution Function of Aligned Elongated Molecules and Particulates Determined from Their Scattering Signature

October 15, 2019
Author(s)
Guan-Rong Huang, Yangyang Wang, Changwoo Do, Yuya Shinohara, Takeshi Egami, Lionel Porcar, Yun Liu, Wei-Ren Chen
We present a strategy for quantitatively evaluating the field-induced alignment of non-spherical particles using small angle scattering techniques. The orientational distribution function (ODF) is determined from the anisotropic scattering intensity via

Biomimetic Approach to Inhibition of Photooxidation in Organic Solar Cells Using Beta-Carotene as an Additive

October 14, 2019
Author(s)
Sebastian Engmann, Vida Turkovic, Michela Prete, Mikkel Bregnhoj, Liana Inasaridze, Dmytro Volyniuk, Filipp Obrezkov, Juozas V. Grazulevicius, Horst G. Rubahn, Pavel Troshin, Peter R. Ogilby, M. Madsen
Recent improvements in the power conversion efficiencies of organic photovoltaic (OPV) cells have highlighted the fact that OPV device lifetimes are now the main bottleneck for further advances of this technology. As such, understanding and controlling

Chain and Ion Dynamics in Precise Polyethylene Ionomers

October 11, 2019
Author(s)
Christopher L. Soles, Amalie Frischknecht, Benjamin Paren, Robert Middleton, Karen Winey, Jason Koski, Madhu Sudan Tyagi, Jacob Daniel Tarver
We analyze the dynamics from microsecond-long, atomistic molecular dynamics (MD) simulations of a series of precise poly(ethylene-co-acrylic acid) ionomers neutralized with lithium, with three different spacer lengths between acid groups on the ionomers

Observation of Strong Polarization Enhancement in Ferroelectric Tunnel Junctions

October 9, 2019
Author(s)
Linze Li, Xiaoxing Cheng, Thomas Blum, Huaixun Huyan, Yi Zhang, Colin A. Heikes, Xingxu Yan, Chaitanya Gadre, Toshihiro Aoki, Mingjie Xu, Lin Xie, Zijian Hong, Carolina Adamo, Darrell G. Schlom, Long-Qing Chen, Xiaoqing Pan
Ferroelectric heterostructures, with capability of storing data at ultrahigh densities, could act as the platform for next-generation memories. The development of new device paradigms has been hampered by the long-standing notion of inevitable

Lattice theory for binding of linear polymers to a solid substrate from polymer melts: II. Influence of van der Waals interactions and chain semi?exibility on molecular binding and adsorption

September 30, 2019
Author(s)
Jack F. Douglas, Jacek Dudowicz, Karl Freed
The Polymeric Langmuir Theory (PLT), developed in Paper I, is employed to investigate the influence of van der Waals interactions and chain rigidity on the thermodynamics of the reversible molecular binding to interfaces in one component polymer fluids

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
Displaying 851 - 875 of 2347
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