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Neutron research

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Displaying 351 - 375 of 931

Polymer Dynamics in Block Copolymer Electrolytes Detected by Neutron Spin Echo

May 19, 2020
Author(s)
Whitney S. Loo, Antonio Faraone, Lorena S. Grundy, Kevin W. Gao, Nitash P. Balsara
Polymer chain dynamics of a nanostructured block copolymer electrolyte are investigated by neutron spin-echo spectroscopy. Monomeric friction, determined by fitting the short-time data to the Rouse model, increases with increasing salt concentration. Tube

Non-fuel Antineutrino Contributions in the High Flux Isotope Reactor

May 14, 2020
Author(s)
PROSPECT COLLABORATION, Jerome LaRosa, Hans Pieter Mumm, Svetlana Nour, Mark Tyra, Denis E. Bergeron
Reactor neutrino experiments have seen major improvements in precision in recent years. With the experimental uncertainties starting to surpass those from theory, it is important to carefully consider all sources of e in making theoretical predictions

In Situ Neutron Scattering of Antibody Adsorption during Protein A Chromatography

April 26, 2020
Author(s)
Maria Papachristodoulou, James Doutch, Hoi Sang Beatrice Leung, Andy Church, Thomas Charleston, Luke A. Clifton, Paul Butler, Christopher J. Roberts, Daniel G. Bracewell
A deeper understanding of the nano and mesoscale structure of chromatographic adsorbents and the distribution of proteins within the media, is critical to a mechanistic understanding of separation processes using these materials. Characterisation of the

Spatial Distribution of PEO-PPO-PEO Block copolymer and PEO Homopolymer in Lipid Bilayers

April 7, 2020
Author(s)
Mihee Kim, Frank Heinrich, Greg Haugstad, Guichuan Yu, Guangcui Yuan, Sushil K. Satija, Wenjia Zhang, Hannah S. Seo, Joseph M. Metzger, Samira M. Azarin, Timothy P Lodge, Benjamin J. Hackel, Frank S. Bates
Maintaining the integrity of cell membranes is indispensable for cellular viability. Poloxamer 188 (P188), a poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymer with a number average molecular weight of 8

Inter-Kramers Transitions and Spin-Phonon Couplings in a Lanthanide-Based Single-Molecule Magnet

April 6, 2020
Author(s)
Duncan H. Moseley, Shelby E. Stavretis, Zhenhua Zhu, Mei Guo, Craig Brown, Mykhaylo Ozerov, Yongqiang Cheng, Luke L. Daemen, Rachael Richardson, Gary Knight, Komalavalli Thirunavukkuarasu, Anibal J. Ramirez-Cuesta, Jinkui Tang, Zi-Ling Xue
Spin-phonon coupling plays a critical role in magnetic relaxation in single-molecule magnets (SMMs) and molecular qubits. Yet, few studies of its nature have been conducted. Phonons here refer to both intermolecular and intramolecular vibrations. In the

Metastability and Reversibility of Anionic Redox-Based Cathode for High-Energy Rechargeable Batteries

March 25, 2020
Author(s)
Bao Qiu, Minghao Zhang, Seung-Yong Lee, Haodong Liu, Thomas A. Wynn, Lijun Wu, Yimei Zhu, Wen Wen, Craig Brown, Dong Zhou, Zhaoping Liu, Ying Shirley Meng
Great focus has been placed on the advancement of anionic redox, to which Li-rich layered oxide cathodes high capacities - currently exceeding 300 mAh g -1 - are attributed. With almost doubled capacity compared with present cathode materials, performance

Interleaflet Coupling of n-Alkane Incorporated Bilayers

March 14, 2020
Author(s)
Hatsuho Usuda, Mafumi Hishida, Elizabeth Kelley, Yasuhisa Yamamura, Michihiro Nagao, Kazuya Saito
The relationship between the membrane bending modulus (k) and compressibility modulus (KA) depends on the extent of coupling between the two monolayers (leaflets). Using neutron spin echo (NSE) spectroscopy, we investigate the effects of n-alkanes on the

Structure and Dynamics of Ethane Confined in Silica Nanopores in the Presence of CO 2

February 28, 2020
Author(s)
Tingting Liu, Siddharth Guatam, David R. Cole, Sumant Patankar, David Tomasko, Wei Zhou, Gernot Rother
Fundamental understanding of subcritical/supercritical behavior of key hydrocarbon species inside nanoporous matrices at elevated pressure and temperature is less developed compared to bulk fluids, but this knowledge is needed for efficient utilization of

Low energy cross section measurement of the 10B(a;n)13N reaction and its impact on neutron production in 1st generation stars

February 26, 2020
Author(s)
Q Liu, M Febbraro, R.J. deBoer, S. Aguilar, A Boeltzig, Y Chen, M Couder, J Gorres, Jamie Weaver, K. T. Macon, M. Wiescher, K. Manukyan, L. Morales, S Pain, W. A. Peters, C. Seymour, G. Seymour, R. Toomey, B. Vande Kolk
Nucleosynthesis in the fi rst generation of massive stars offer a unique setting to explore the creation of the fi rst heavier nuclei in an environment free of impurities from earlier stellar generations. In later generations of massive stars, hydrogen

Understanding How Ligand Functionalization Influences CO 2 and N 2 Adsorption in a Sodalite Metal-Organic Framework

February 25, 2020
Author(s)
Mehrdad Asgari, Rocio Semino, Pascal A. Schouwink, Ilia Kochetygov, Jacob D. Tarver, Olga Trukhina, Rajamani Krishna, Craig Brown, Michele Ceriotti, Wendy L. Queen
In this work, a detailed study is conducted to understand how ligand substitution influences the CO 2 and N 2 adsorption properties of two highly crystalline sodalite MOFs known as Cu-BTT (BTT -3= 1,3,5-benzenetristetrazolate) and Cu-BTTri (BTTri -3 = 1,3

Understanding Superionic Conductivity in Lithium and Sodium Salts of Weakly Coordinating Closo-Hexahalocarbaborate Anions

February 25, 2020
Author(s)
Mathias Jorgensen, Patrick T. Shea, Anton W. Tomich, Joel B. Varley, Marnik Bercx, Sergio Lovera, Radovan Cerny, Wei Zhou, Terrence J. Udovic, Vincent Lavallo, Torben R. Jensen, Brandon C. Wood, Vitalie Stavila
Solid-state ion conductors based on closo-polyborate anions combine high ionic conductivity with a rich array of tunable properties. Cation mobility in these systems is intimately related to the strength of the interaction with the neighboring anionic

Molecular Insight into Fluorocarbon Adsorption in Pore Expanded Metal-Organic Framework Analogs

February 12, 2020
Author(s)
Jian Zheng, Dushyant Barpaga, Benjamin Trump, Manish Shetty, Yanzhong Fan, Papri Bhattacharya, Jeromy J. Jenks, Cheng-Yong Su, Craig Brown, Guillaume Maurin, B. Peter McGrail, Radha Kishan Motkuri
The rapid growth in the global energy demand for space cooling requires the development of more efficient environmental chillers for which adsorption-based cooling systems can be utilized. Here in this contribution, we explore sorbents for chiller use via

Optimum lithium loading of a liquid scintillator for neutron and neutrino detection

February 11, 2020
Author(s)
Hans Pieter Mumm, Denis E. Bergeron, Mark Tyra, Jerome LaRosa, Svetlana Nour, T.J. Langford, Dimitry A. Pushin
Neutral particle detection in high-background environments is greatly aided by the ability to easily load 6Li into liquid scintillators. We describe a readily available and inexpensive liquid scintillation cocktail stably loaded with up to 1 % Li by mass

Transverse Lipid Organization Dictates Bending Fluctuations in Model Plasma Membranes

January 21, 2020
Author(s)
Brett W. Rickeard, Michael H. Nguyen, Mitchell DiPasquale, Caesar G. Yip, Hamilton Baker, Frederick A. Heberle, Xiaobing Zuo, Elizabeth Kelley, Michihiro Nagao, Drew Marquardt
Bending fluctuation is one of the most important dynamic modes of lipid membranes. These fluctuations play a vital role in many biological processes, most notoriously, contributing to the regulation of membrane protein activity. We investigated the bending

Structural and Reorientational Dynamics of Tetrahydroborate (BH 4 -) and Tetrahydrofuran (THF) in a Mg(BH 4 ) 2 &#82263THF Adduct: Neutron-Scattering Characterization

January 7, 2020
Author(s)
Mirjana NMN Dimitrievska, Marina Chong, Mark E. Bowden, Hui Wu, Wei Zhou, Iffat Nayyar, Bojana Ginovska, Thomas Gennett, Tom Autrey, Craig M. Jensen, Terrence J. Udovic
Metal borohydrides are considered as promising materials for hydrogen storage applications due to their high volumetric and gravimetric hydrogen densities. Recently, different solvents have been complexed with Mg(BH 4) 2 in efforts to improve its

6 LiF:ZnS(Ag) Neutron Detector Performance Optimized using Waveform Recordings and ROC Curves

January 1, 2020
Author(s)
Kevin N. Pritchard, A. Osovizky, Jeffrey B. Ziegler, Louis E. Binkley, Peter NMN Tsai, Nancy Hadad, M. Jackson, C. Hurlbut, George M. Baltic, Charles Majkrzak, Nicholas C. Maliszewskyj
We used data analysis and pattern recognition techniques to optimize the neutron sensitivity and selectivity of an ultrathin 6LiF:ZnS(Ag) scintillator based neutron detector paired with a Silicon Photomultiplier (SiPM). We recorded waveforms from the
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