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Neutron research

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Displaying 301 - 325 of 914

Competing Antiferromagnetic-Ferromagnetic States in d 7 Kitaev Honeycomb Magnet

December 14, 2020
Author(s)
Hector Vivanco, Benjamin Trump, Craig Brown, Tyrel M. McQueen
The Kitaev model is a rare example of an analytically solvable and physically instantiable Hamiltonian yielding a topological quantum spin liquid ground state. Here we report signatures of Kitaev spin liquid physics in the honeycomb magnet Li 3Co 2SbO 6

Boosting Membrane Hydration for High Current Densities in Membrane Electrode Assembly CO2 Electrolysis

November 25, 2020
Author(s)
Hisan W. Shafaque, ChungHyuk Lee, Kieran F. Fahy, Jason K. Lee, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, Aimy Bazylak
Despite the advantages of CO2 electrolyzers, efficiency losses due to mass and ionic transport across the membrane electrode assembly (MEA) are critical bottlenecks for commercial-scale implementation. In this study, more efficient electrolysis of CO2 was

Peritectic Phase Transition of Benzene and Acetonitrile into a Cocrystal Relevant to Titan, Saturn's Moon

November 14, 2020
Author(s)
Christina A. McConville, Yunwen Tao, Hayden Evans, Benjamin Trump, Jonathan B. Lefton, Wenqian Xu, Andrey A. Yakovenko, Elfi Kraka, Craig Brown, Tomce Runcevski
Benzene and acetonitrile are two of the most commonly used solvents found in almost every chemical laboratory. Titan, Saturn's icy moon, is one other place in the Solar system that has even larger amounts of these compounds, together with many other

SurA is a Cryptically Grooved Chaperone that Expands Unfolded Outer Membrane Proteins

October 21, 2020
Author(s)
Dagan C. Marx, Ashlee M. Plummer, Anneliese M. Faustino, Taylor Devlin, Michaela A. Roskopf, Mathis J. Leblanc, Henry J. Lessen, Barbara T. Amann, Patrick J. Fleming, Susan T. Krueger, Stephen D. Fried, Karen G. Fleming
The periplasmic chaperone network ensures the biogenesis of bacterial outer membrane proteins (OMPs) and has recently been identified as a promising target for antibiotics. SurA is the most important member of this network, both due to its genetic

Effect of H 2 O Molecules on Thermal Expansion of TiCo(CN) 6

October 19, 2020
Author(s)
Qilong Gao, Xinwei Shi, Alessandro Venier, Qingzhen Huang, Hui Wu, Jun Chen, Andrea Sanson, Erjun Liang
The understanding of the role of guest molecules in the lattice void of open-framework structures is vital for thermal expansion tailoring. Here, we take a new NTE compound, TiCo(CN) 6 as a case study from the local structure perspective to investigate the

Enhance Dynamics in the Anomalous Melting Regime of DMPG Lipid Membranes

October 16, 2020
Author(s)
Elizabeth Kelley, Michihiro Nagao, Paul Butler, Lionel Porcar, Bela Farago
Like many soft materials, lipids undergo a melting transition associated with a significant increase in their dynamics. At temperatures below the main melting transition (T m), all molecular and collective dynamics are suppressed, while above T m the alkyl

Domain Interactions Determine the Conformational Ensemble of the Periplasmic Chaperone SurA

October 1, 2020
Author(s)
Dagan C. Marx, Mathis J. Leblanc, Ashlee M. Plummer, Susan T. Krueger, Karen G. Fleming
SurA is thought to be the most important periplasmic chaperone for outer membrane protein biogenesis. Its structure is composed of a core region and two peptidylprolyl isomerase domains, termed P1 and P2, connected by flexible linkers. As such these three

Elucidating the Structure of the Metal-Organic Framework Ru-HKUST-1

September 22, 2020
Author(s)
Gregory R. Lorzing, Krista P. Balto, Alexandra M. Antonio, Benjamin Trump, Craig Brown, Eric D. Bloch
Ru-HKUST-1 (Ru 3(btc) 2X 1.5; btc 3– = 1,3,5-benzentricarboxylate; X –^ = chloride, acetate, trimesate) has received considerable attention as a result of its structure type, tunability, and the redox-active nature of its constituent metal paddlewheel

Scaling Relationships for the Elastic Moduli and Viscosity of Mixed Lipid Membranes

September 21, 2020
Author(s)
Elizabeth Kelley, Paul Butler, Rana Ashkar, Robert Bradbury, Michihiro Nagao
The elastic and viscous properties of biological membranes play a vital role in controlling cell functions that require local reorganization of the membrane components as well as dramatic shape changes such as endocytosis, vesicular trafficking, and cell

Electric-field imaging using polarized neutrons

September 10, 2020
Author(s)
Y.- Y. Jau, Daniel S. Hussey, Thomas R. Gentile, Wangchun Chen
We experimentally demonstrate that electrically neutral particles, neutrons, can be used to directly visualize the electrostatic field inside a target volume that can be physically isolated or occupied. Electric field images are obtained using a spin

Accelerating Bubble Detachment in Porous Transport Layers with Patterned Through-Pores

September 9, 2020
Author(s)
Jason K. Lee, ChungHyuk Lee, Kieran F. Fahy, Pascal J. Kim, Kevin Krause, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, Aimy Bazylak
Mass transport losses ultimately suppress gas evolving electrochemical energy conversion technologies, such as fuel cells and carbon dioxide electrolyzers, from reaching the high current densities needed to realize commercial success. In this work, we

Restricting Orbital Angular Momentum by Transverse Coherence

September 5, 2020
Author(s)
Ronald L. Cappelletti, John T. Vinson
A traveling wave or wave packet may possess orbital angular momentum in the form of a phase vortex about its axis of propagation. These orbital angular momentum states are a general wave phenomenon, and, as such, can be realized for individual wave packets

A Mechanical Mechanism for Vitamin E Acetate in E-cigarette/Vaping-Associated Lung Injury

August 26, 2020
Author(s)
Mitchell DiPasquale, Omotayo Gbadamosi, Michael H. L. Nguyen, Stuart R. Castillo, Brett W. Rickeard, Elizabeth Kelley, Michihiro Nagao, Drew Marquardt
The outbreak of electronic-cigarette/vaping associated lung injury (EVALI) has made thousands ill. This lung injury has been attributed to a physical interaction between toxicants from the vaping oils and the pulmonary surfactant. Pulmonary surfactant is

Critical Current Density as a Performance Indicator for Gas-Evolving Electrochemical Devices

August 26, 2020
Author(s)
Jason K. Lee, ChungHyuk Lee, Benzhong Zhao, Jacob LaManna, Eli Baltic, Daniel S. Hussey, David L. Jacobson, Aimy Bazylak
Reaching high current densities is absolutely imperative for electrochemical energy conversion, from fuel cells to CO2 reduction. Here, we identify the existence of a performance indicator for gas-evolving electrochemical energy conversion devices: the

Position-dependent neutron detection efficiency loss in 3He gas proportional counters

August 22, 2020
Author(s)
Patrick N. Peplowski, Zachary W. Yokley, Madison Liebel, Shuo Cheng, Richard C. Elphic, Shannon Hoogerheide, David J. Lawrence, Jeffrey Nico
The position-dependent neutron detection response of a 3He gas proportional counter (GPC) was characterized using a collimated (3-mm-wide), monoenergetic 0.05 eV neutron beam. For neutrons incident on the GPC near the ends of the active region, the neutron

The Antioxidant Vitamin E as a Membrane Raft Modulator: Tocopherols do not Abolish Lipid Domains

August 1, 2020
Author(s)
Mitchell DiPasquale, Michael H. Nguyen, Brett W. Rickeard, Nicole Cesca, Christopher Tannous, Stuart R. Castillo, John Katsaras, Elizabeth Kelley, Frederick A. Heberle, Drew Marquardt
A great deal of individuals across North America regularly supplement their diet with the antioxidant, vitamin E. This billion-dollar supplementation industry encourages the use of vitamin E with little evidence supporting its actual health benefits
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