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Neutron research

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Displaying 426 - 450 of 1579

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
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