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Neutron research

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Displaying 526 - 550 of 925

Mixed Conductive Soft Solids by Electrostatically Driven Network Formation of a Conjugated Polyelectrolyte

February 15, 2018
Author(s)
Scott P. O. Danielsen, Gabriel E. Sanoja, Samantha R. McCuskey, Boualem Hammouda, Guillermo C. Bazan, Glenn H. Fredrickson, Rachel A. Segalman
The microscopic network structure transitions of a conjugated polyelectrolyte (Poly[2,6-(4,4-bis-potassium butanylsulfonate-4H-cyclopenta-[2,1-b;3,4-b']-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)], CPE-K) hydrogel were explored with a combination of

Neutron Interferometry Detection of Early Crack Formation in Fatigued Additively Manufactured SS316 Dogbones

February 15, 2018
Author(s)
Daniel S. Hussey, Hong Yao, Adam J. Brooks, Ali Haghshenas, Jumao Yuan, Caroline G. Lowery, Jacob M. LaManna, David L. Jacobson, Nikolay Kardjilov, Shengmin Guo, Michael M. Khonsari, Leslie G. Butler
Fatigue in selective laser melted (SLM) and conventional SS316 dogbones was studied with neutron imaging methods for attenuation, scattering, and diffraction. To detect the microcrack evolution in fatigued samples,two methods of grating-based neutron

Insertion of Dengue E into Lipid Bilayers Studied by Neutron Reflectivity Molecular Dynamics Simulations

February 13, 2018
Author(s)
Juan M. Vanegas, Frank Heinrich, David M. Rogers, Bryan D. Carson, Sadie La Bauve, Briana C. Vernon, Sushil K. Satija, Aihua Zheng, Margaret Kielian, Susan B. Rempe, Michael S. Kent
The envelope (E) protein of Dengue virus rearranges to a trimeric hairpin to mediate fusion of the viral and target membranes, which essential for infectivity. Insertion of E into the target membrane serves to anchor E and possibly also to disrupt local

Beyond Catalysis and Membranes: Visualizing and Solving the Electrode Water Challenge in AEMFCs

February 8, 2018
Author(s)
Daniel S. Hussey, Travis J. Omasta, Andrew M. Park, Jacob M. LaManna, Yufeng Zheng, Xiong Peng, Lianqin Wang, David L. Jacobson, John R. Varcoe, Bryan S. Pivovar, William E. Mustain
A majority of anion exchange membrane fuel cells (AEMFCs) reported in the literature have been unable to achieve high current or power. A recently proposed theory is that the achievable current is largely limited by poorly balanced water during cell

Investigation of Alteration of Li-6 Enriched Neutron Shielding Glass

January 31, 2018
Author(s)
Jamie Weaver, Danyal J. Turkoglu
Silicate glass doped with 6Li is a common slow neutron shielding material, and has been utilized as such in several neutron research facilities. 6Li is a unique isotope for thermal neutron capture as it has a large thermal neutron capture cross section (≈

Nuclear Magnetic Resonance Study of Anion and Cation Reorientational Dynamics in (NH 4 ) 2 B 12 H 12

January 29, 2018
Author(s)
Alexander V. Skripov, Roman V. Skoryunov, Alexei V. Soloninin, Olga A. Babanova, Vitalie Stavila, Terrence J. Udovic
Diammonium dodecahydro-closedidecabirate (NH 4) 2B 12H 12 is the ionic compound combining NH 4 + cations and [B 12H 12] 2- anions both of which can exhibit high reorientational mobility. To study the dynamical properties of this unusual material, we have

Glycerol Hydrogen-Bonding Network Dominates Structure and Collective Dynamics in a Deep Eutectic Solvent

January 25, 2018
Author(s)
Antonio Faraone, Durgesh V. Wagle, Gary A. Baker, E. C. Novak, M. Ohl, D. Reuter, Peter Lunkenheimer, A. Loidl, Eugene Mamontov
The deep eutectic solvent glyceline formed by choline chloride and glycerol in 1:2 molar ratio is much less viscous compared to glycerol, which facilitates its use in many applications where high viscosity is undesirable. Despite the large difference in

H 2 Adsorption on Cu(I)-SSZ-13

January 11, 2018
Author(s)
Bahar Ipek, Rachel A. Pollock, Craig Brown, Deniz Uner, Raul F. Lobo
We report H 2 adsorption capacities reaching 0.05 mass% (wt. %) at 303 K and 1 atm H 2 pressure on solid-state CuCl-exchanged [Al]-SSZ-13 and [B]-SSZ zeolites. Differential heat of H 2 adsorption is found in the range between 16 KJ mol H 2 -1 and 48 KJ mol

Small-Angle X-ray and Neutron Scattering Demonstrates that Cell-Free Expression Produces Properly Formed Disc-Shaped Nanolipoprotein Particles

December 19, 2017
Author(s)
Thomas Cleveland, Wei He, Angela C. Evans, Nicholas O. Fischer, Matthew A. Coleman, Paul Butler
Nanolipoprotein particles (NLPs), composed of a membrane scaffold protein and lipids, have been used to support membrane proteins in a native-like bilayer environment for biochemical or structural studies. Traditionally, these NLPs have been prepared by

Characterization of Monoclonal Antibody - Protein Antigen Complexes Using Small-Angle Scattering and Molecular Modeling

December 15, 2017
Author(s)
Maria Monica Castellanos Mantilla, James Anthony Snyder, Melody Lee, Srinivas Chakravarthy, Nicholas J. Clark, Arnold McAuley, Joseph E. Curtis
The determination of monoclonal antibody interactions with protein antigens in solution can lead to important insight to guide physical characterization and molecular engineering of therapeutic targets. We used small-angle scattering (SAS) combined with

Spatial Distribution of Hydrophobic Drugs in Model Nanogel-core Star Polymers

December 5, 2017
Author(s)
Vivek M. Prabhu, Guangmin Wei, Robert D. Miller, Victoria A. Piunova, William Swope, Amber Carr
Star polymers with a cross-linked nanogel-core are promising carriers of cargo for therapeutic applications due the synthetic control of amphiphilicity of arms and the stability to infinite dilution. Three nanogel-core star polymers were investigated to

Structural Basis for the Inhibitory Effects of Ubistatins in the Ubiquitin-Proteasome Pathway

December 5, 2017
Author(s)
Mark A. Nakasone, Timothy A. Lewis, Olivier Walker, Anita Thakur, Wissam Mansour, Carlos A. Castaneda, Jennifer L. Goeckeler-Fried, Frank Parlati, Tsui-Fen Chou, Ortal Hayat, Daoning Zhang, Christina M. Camara, Steven M. Bonn, Urszula K. Nowicka, Susan T. Krueger, Michael H. Glickman, Jeffrey L. Brodsky, Raymond J. Deshaies, David Fushman
The success of proteasome inhibitors has led to intense efforts to discover points of therapeutic intervention for nearly every component of the ubiquitin-proteasome system. The discovery of ubistatins, small molecules that inhibit proteasomal degradation

Assessment of PGAA capability for low-level measurements of H in Ti alloy

December 1, 2017
Author(s)
Danyal J. Turkoglu, Huaiyu H. Chen-Mayer, Rick L. Paul, Rolf L. Zeisler
The accuracy of low-level hydrogen measurements with prompt gamma-ray activation analysis (PGAA) depends on identifying and accounting for all background H signal, including interfering signals. At the cold-neutron (CN)PGAA facility at the NIST Center for

Optically Polarized He3

November 30, 2017
Author(s)
Thomas R. Gentile, P.J. Nacher, B Saam, T G. Walker
This article reviews the physics and technology of producing large quantities fo highly spin- polarized, or hyderpolarized, He3 nuclei using spin-exchange (SEOP) and metastability-exchange (MEOP) optical pumping, and surveys applications of polarized He3

Multimodality of Structural, Electrical, and Gravimetric Responses of Intercalated MXenes to Water

November 28, 2017
Author(s)
Eric S. Muckley, Michael Naguib, Hsiu-Wen Wang, Lukas Vlcek, Naresh C. Osti, Robert L. Sacci, Xiahan Sang, Raymond R. Unocic, Yu Xie, Madhu Sudan Tyagi, Eugene Mamontov, Katharine L. Page, Paul R. C. Kent, Jagjit Nanda, Ilia N. Ivanov
Understanding of structural, electrical and gravimetric peculiarities of water vapor interaction with ion-intercalated MXenes used to design of a multimodal humidity sensor. Neutron scattering coupled to molecular dynamics and ab initio calculations showed

Clustering and Percolation in Suspensions of Carbon Black

November 17, 2017
Author(s)
Jeffrey J Richards, Julie Hipp, John K Riley, Norman J. Wagner, Paul Butler
In situ measurements are an increasingly important tool to inform the complex relationship between nanoscale properties and macroscopic measurements. These relationships can be used to inform the development of new materials, we have developed a SANS

The Effects of Burial Diagenesis on Multiscale Porosity in the St. Peter Sandstone: An Imagine, Small-Angle, and Ultra-Small-Angle Neutron Scattering Analysis

November 4, 2017
Author(s)
Lawrence M. Anovitz, Jared T. Freiburg, Matthew J. Wasbrough, David F. Mildner, Kenneth C. Littrell, Vitaliy Pipich, Jan Ilavsky
To examine the effects of burial diagenesis on heirarchical pore structures in sandstone and compare those with the effects of overgrowth formation, we obtained samples of St. Peter Sandstone from drill cores obtained in the Illinois and Michigan Basins

Studying Water and Solute Transport through Desalination Membranes via Neutron Radiography

October 25, 2017
Author(s)
Devin L. Shaffer, Jacob M. LaManna, David L. Jacobson, Daniel S. Hussey, Menachem Elimelech, Edwin P. Chan
Neutron radiography, a non-destructive imaging technique, is applied to study water and solute transport through desalination membranes. Specifically, we use neutron radiography to quantify lithium chloride draw solute concentrations across a thin-film

Chain Conformation near the Buried Interface in Nanoparticle-Stabilized Polymer Thin Films

October 10, 2017
Author(s)
Deborah A. Barkley, Naisheng Jiang, Mani Sen, Maya K. Endoh, Jonathan G. Rudick, Tadanori Koga, Yugang Zhang, Oleg Gang, Guangcui Yuan, Sushil K. Satija, Daisuke Kawaguchi, Keiji Tanaka, Alamgir Karim
It is known that when nanoparticles are added to polymer thin films, they often migrate to the film-substrate interface and form an "immobile interfacial layer", which has been believed as the origin of suppression of dewetting. We here report an

Latent Porosity in Alkali-Metal M 2 B 12 F 12 Salts: Structures and Rapid Room-Temperature Hydration/Dehydration Cycles

October 2, 2017
Author(s)
Dmitry V. Peryshkov, Eric V. Bukovsky, Matthew R. Lacroix, Hui Wu, Wei Zhou, W. Matthew Jones, Matic Lozinsek, Travis C. Folsom, D. Luke Heyliger, Terrence J. Udovic, Steven H. Strauss
Structures of the alkali metal hydrates Li 2(H 2O) 4Z, LiK(H 2O) 4, Na 2(H 2O) 3Z, and Rb 2(H 2O) 2Z, unit cell parameters for Rb 2Z and Rb 2(H 2O) 2Z, and the DFT-optimized structures of K 2Z, K 2(H 2O) 2Z, Rb 2Z, Rb 2(H 2O) 2Z, Cs 2Z, and Cs 2(H 2O)Z are
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