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Displaying 1 - 25 of 840

Maximally efficient exchange in thin flow cells using density gradients

October 25, 2024
Author(s)
Megan Mitchell, Charles Majkrzak, David Hoogerheide
Flow cells are ubiquitous in laboratories and automated instrumentation and are crucial for ease of sample preparation, analyte addition, and buffer exchange. Often, the assumption that the fluids have exchanged completely in a flow cell is crucial to data

Single-Crystalline Covalent Organic Frameworks with Exceptionally High Specific Surface Areas and Gas Storage Capacities

October 10, 2024
Author(s)
Baoqiu Yu, Yu Tao, Xuan Yao, Yucheng Jin, Shan Liu, Tongtong Xu, Hailong Wang, Hui Wu, Wei Zhou, Xin Zhou, Xiao Wang, Xu Ding, Xin Xiao, Yue-Biao Zhang, Jianzhuang Jiang
Single-crystalline covalent organic frameworks (COFs) are highly desirable towards understanding their pore chemistry and functions. Herein, two 50100 μm single-crystalline three-dimensional (3D) COFs, TAM-TFPB-COF and TAPB-TFS-COF, were fabricated from

Calibration of a gamma ray Compton camera for radioactivity measurements

September 10, 2024
Author(s)
Heather H. Chen-Mayer, Dagistan Sahin, Bryan Remley, Steven Brown, David Goodman
A dual-plane Compton imaging detector previously developed for prompt gamma imaging has been further tested and calibrated for quantitative radioactivity determination, specifically to assess radioactive debris from a reactor fuel element containing

Measurement of Chloride in Concrete by Prompt Gamma Neutron Activation

September 1, 2024
Author(s)
Richard A. Livingston, Preethi Sridhar, Neal Berke, Amde M. Amde, Heather H. Chen-Mayer
Prompt Gamma Activation Analysis (PGAA) is an elemental analysis method based on radiative neutron capture that is isotope-specific and has a high sensitivity to chlorine (Cl). To evaluate the feasibility of replacing the conventional wet chemistry method

Flow Activation Energy of High-Concentration Monoclonal Antibody Solutions and Protein-Protein Interactions Influenced by NaCl and Sucrose

August 20, 2024
Author(s)
Guangcui Yuan, Paul Salipante, Steven D. Hudson, Richard Gillilan, Qingqiu Huang, Harold Hatch, Vincent Shen, Alexander Grishaev, Suzette Pabit, Rahul Upadhya, Sudeep Adhikari, Jainik Panchal, Marco Blanco, Yun Liu
The solution viscosity and protein−protein interactions (PPIs) as a function of temperature (4−40 °C) were measured at a series of protein concentrations for a monoclonal antibody (mAb) with different formulation conditions, which include NaCl and sucrose

AutoRefl: Active Learning in Neutron Reflectometry for Fast Data Acquisition

August 1, 2024
Author(s)
David Hoogerheide, Frank N. Heinrich
Neutron reflectometry (NR) is a powerful technique for interrogating the structure of thin films at interfaces. Because NR measurements are slow and instrument availability is limited, measurement efficiency is paramount. One approach to improving

Generation of Neutron Airy Beams

July 28, 2024
Author(s)
Charles W. Clark, Dmitry Pushin, Michael G. Huber, Kirill Zhernenkov, Jonathan White, Lisa DeBeer-Schmitt, David Cory, Huseyin Ekinici, Melissa Henderson, Owen Lailey, Dusan Sarenac
The Airy wave packet is a solution to the potential-free Schr¨odinger equation that exhibits remark-able properties such as self-acceleration, non-diffraction, and self-healing. Although Airy beams are now routinely realized with electromagnetic waves and

Spin Echo Small-Angle Neutron Scattering using Superconducting Magnetic Wollaston Prisms

July 17, 2024
Author(s)
Fumiaki Funama, Caitlyn Wolf, Kathleen Weigandt, Jiazhou Shen, Steven Parnell, Fankang Li
We show the implementation of superconducting magnetic Wollaston prisms for spin echo small-angle neutron scattering. Two calibration methods for the spin echo length are presented: one utilizing spin echo modulated small-angle neutron scattering and the

Liquid Deuterium Cold Source Concept for the NIST Neutron Source

July 5, 2024
Author(s)
John Jurns, Philipp Arnold, Jeremy Cook, Osman Celikten
The National Institute of Standards and Technology (NIST) Center for Neutron Research (NCNR) houses an aging reactor that serves more than 40 % of all cold neutron research needs in the U.S. First critical in 1967, the National Bureau of Standards Reactor

Neutron Vibrational Spectroscopic Study of the 1:1 Acetylene:Ammonia Cocrystal Relevant to Titan, Saturn's Moon

July 5, 2024
Author(s)
Morgan Kramer, Trump Benjamin, Luke Daemen, Rafael Balderas-Xicohtencatl, Yongqiang Cheng, Anibal J. Ramirez-Cuesta, Craig Brown, Tomce Runcevski
The surface of Titan, Saturn's icy moon, is believed to be comprised of various molecular minerals with a great diversity in structure and composition. Under the surface conditions, 93 K and 1.45 atm, most small molecules solidify and form minerals

Suppression of Segmental Chain Dynamics on a Particle's Surface in Well-Dispersed Polymer Nanocomposites

June 18, 2024
Author(s)
Jihyuk Kim, Benjamin Thompson, Taiki Tominaga, Takahito Osawa, Takeshi Egami, Stephan Forster, Michael Ohl, Erkan Senses, Antonio Faraone, Norman J. Wagner
The Rouse dynamics of polymer chains in model nanocomposite polyethylene oxide/silica nanoparticles (NPs) was investigated using quasielastic neutron scattering. The apparent Rouse rate of the polymer chains decreases as the particle loading increases

Bubbles Enable Volumetric Negative Compressibility in Metastable Elastocapillary Systems

June 13, 2024
Author(s)
Davide Caprini, Francesco Battista, Pawel Zajdel, Giovanni Di Muccio, Carlo Guardiani, Benjamin Trump, Marcus Carter, Andrey Yakovenko, Eder Amayuelas, Luis Bartolome, Simone Meloni, Yaroslav Grosu, Carlo Massimo Casciola, Alberto Giacomello
Although coveted in applications, few materials expand when subject to compression or contract under decompression, i.e., exhibit negative compressibility. A key step to achieve such counterintuitive behaviour is the destabilisations of (meta)stable

A New Inelastic Neutron Spectrometer HODACA

May 28, 2024
Author(s)
Hodaka Kikuchi, Shinichiro Asai, Taku Sato, Taro Nakajima, Leland Harriger, Igor Zaliznyak, Takatsugu Masuda
A new multiplex-type inelastic neutron scattering spectrometer, HOrizontally Defocusing Analyzer Concurrent data Acquisition spectrometer (HODACA), was recently developed and built at the C1-1 cold neutron beam port in JRR-3. The spectrometer is suitable

Visualizing 3D Morphologies and Spatial Heterogeneities of Li after Fast- Charging via In-situ Neutron Tomography

March 22, 2024
Author(s)
Maha Yusuf, Anders Kaestner, Markus Wied, Jacob LaManna, Nghia Vo, Alison Dunlop, Andrew Jansen, Bryant Polzin, Stephen Trask, Markus Strobl, Vanessa Wood, Michael Toney, Johanna Weker
Mechanistic understanding of Li plating is imperative to developing fast-charging batteries for sustainable electric vehicles. Here, we report in-situ 3D characterization of the morphology and spatial heterogeneities of Li plating using neutron micro

Swelling of Star Polymer Thin Films Exposed to Supercritical Carbon Dioxide

March 14, 2024
Author(s)
Ayse Caglayan, Sushil Satija, David Uhrig, Kunlun Hong, Tadanori Koga, Bulent Akgun
Impact of polymer chain architecture on the swelling of supported single-layer polymer thin films with thicknesses below 80 nm in the presence of supercritical CO2 (scCO2) is investigated using in-situ neutron reflectivity (NR) and exsitu x-ray

Reorientational Dynamics in Y(BH4)3:xNH3 (x = 0, 3 and 7): The Impact of NH3 on BH4- Dynamics

March 9, 2024
Author(s)
Jakob Grinderslev, Ulrich Haussermann, T. Jensen, Antonio Faraone, Michihiro Nagao, M. Karlsson, Terrence J. Udovic, M. Andersson
The reorientational dynamics of Y(BH4)3·xNH3 (x = 0, 3, and 7) was studied using quasielastic neutron scattering (QENS) and neutron spin echo (NSE). The results showed that changing the number of NH3 ligands drastically alters the reorientational mobility

Designing Nuclear Fuels with a Multi-Principal Element Alloying Approach

March 1, 2024
Author(s)
G. Beausoleil, J. Zillinger, L. Hawkins, T. Yao, Abdullah Weiss, X. Pu, N. Jerred, D. Kaoumi
Previous research has shown that multi-principal element alloys (MPEAs) using chromium, molybdenum, niobium, tantalum, titanium, vanadium, and zirconium can form stable body-centered-cubic (BCC) structures across a large temperature region (25°C to 1000°C)

Dynamic Structure Factor of Undulating Vesicles: Finite-Size and Spherical Geometry Effects with Application to Neutron Spin Echo Experiments

February 14, 2024
Author(s)
Rony Granek, Ingo Hoffmann, Elizabeth Kelley, Michihiro Nagao, Petia Vlahovska, Anton Zilman
We consider the dynamic structure factor (DSF) of quasi-spherical vesicles and present a generalization of an expression that was originally formulated by Zilman and Granek (ZG) for scattering from isotropically oriented quasi-flat membrane plaquettes. The

Bulk Elastic Constants And Their Role In Diffractive Stress Analysis

January 1, 2024
Author(s)
Thomas Gnaupel-Herold
The accuracy of stress determination depends to a large extent on the accuracy to which the diffraction elastic constants (DEC) can be obtained. DEC calculations require primarily single crystal elastic constants as input; however, large disparities
Displaying 1 - 25 of 840