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Neutron research

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Displaying 426 - 450 of 925

Methanol Accelerates DMPC Flip-Flop and Transfer: A SANS Study on Lipid Dynamics

March 5, 2019
Author(s)
Michael H. L. Nguyen, Mitchell DiPasquale, Brett W. Rickeard, Christopher B. Stanley, Elizabeth Kelley, Drew Marquardt
Methanol is a common solubilizing agent used for the study of transmembrane proteins/peptides in biological and synthetic membranes. Using small angle neutron scattering (SANS) and a strategic contrast matching scheme, we show that methanol has a unique

New Insights into Water Dynamics of Portland Cement Paste with Nano-Additives using Quasielastic Neutron Scattering

March 1, 2019
Author(s)
Kunal Kupwade-Patil, Ali Bumajdad, Craig Brown, Madhu Sudan Tyagi, Nicholas Butch, Abdullah F. Jamsheer, Oral Buyukozturk
Early age hydration kinetics of Portland cement with nano additives such as nano-silica (NS) was examined using quasielastic neutron scattering (QENS). Cement pastes with different ratios of Portland cement to NS was prepared. The concentration of the NS

Neutron Instruments for Research in Coordination Chemistry

February 28, 2019
Author(s)
Zi-Ling Xue, Anibal J. Ramirez-Cuesta, Craig Brown, Stuart Calder, Huibo Cao, Bryan C. Chakoumakos, Luke L. Daemen, Ashfia Huq, Alexander I. Kolesnikov, Eugene Mamontov, Andrey A Podlesnyak, Xiaoping Wang
Neutron diffraction and spectroscopies offer unique insight into structures and properties of solids and molecular materials. All neutron instruments located at the various neutron sources are distinct, even if their designs are based on similar principles

Probing Magnetic Excitations in Co^II^ Single-Molecule Magnets by Inelastic Neutron Scattering

February 27, 2019
Author(s)
Shelby E. Stavretis, Yongqiang Cheng, Luke L. Daemen, Craig Brown, Duncan H. Moseley, Eckhard Bill, Mihail Atanasov, A. J. Ramirez-Cuesta, Frank Neese, Zi-Ling Xue
Co(acac) 2(H 2O) 2 (1 acac = acetylacetonate), a transition metal complex (S = 3/2), displays field-induced slow magnetic relaxation as a single-molecule magnet (SMMs). For 1 and its isotopologues Co(acac) 2(D 2O) 2 (1-d 4^) and Co(acac-d 7) 2(D 2O) 2 (1-D

Scaling of Lipid Membrane Rigidity with Domain Area Fraction

February 21, 2019
Author(s)
Elizabeth G. Kelley, Michihiro Nagao, Paul D. Butler
The elastic properties of cell membranes play a vital role in controlling the morphology changes necessary for cell processes such as endocytosis and cell division. These elastic properties are highly sensitive to the lipid composition and distribution

Solvent-Pore Interactions in the Easgle Ford Shale Formation

February 15, 2019
Author(s)
Victoria H. DiStefano, Joanna McFarlane, Andrew G. Stack, Edmund Perfect, David F. Mildner, Markus Bleuel, Steve J. Chipera, Kenneth C. Littrell, Michael C. Cheshire, Katherine E. Manz, Lawrence M Anovitz
The effect of solvent extraction on pore space was examined on a suite of samples from the Eagle Ford Shale Formation with varying lithologies and maturities. Several solvents were contacted with shales, extracting the compatible organic matter. The

Porous Zero-Mode Waveguides for Picogram-Level DNA Capture

February 13, 2019
Author(s)
Vivek Jadhav, David Hoogerheide, Jonas Korlach, Meni Wanunu
We have recently shown that nanopore zero-mode waveguides are effective tools for capturing picogram levels of long DNA fragments for single-molecule DNA sequencing. Despite these key advantages, manufacturing of large arrays is not practical due to the

Optimization of Reflectometry Experiments using Information Theory

February 1, 2019
Author(s)
Bradley W. Treece, Paul A. Kienzle, David Hoogerheide, Charles Majkrzak, Mathias Loesche, Frank Heinrich
A method based on Bayesian statistics and information theory is developed to analyze the information gain Δ}H of surface-sensitive reflectometry experiments. After presenting the underlying mathematical framework and its implementation, the method is

Ni 2 Mo 3 O 8 : Complex Antiferromagnetic Order on a Honeycomb Lattice

January 18, 2019
Author(s)
Jennifer R. Morey, Allen Scheie, John P. Sheckelton, Craig Brown, Tyrel M. McQueen
Theoretical studies have predicted the existence of topological magnons in honeycomb compounds with zig-zag antiferromagnetic (AFM) order. Here we report this discovery of zig-zag AFM order in the layered and non-centrosymmetric honeycomb nickelate Ni 2Mo

High-Pressure Synthesis of A 2 NiO 2 Ag 2 Se 2 (A=Sr, Ba) with a High-Spin Ni 2+ in Square-Planar Coordination

January 14, 2019
Author(s)
Yuki Matsumoto, Takafumi Yamamoto, Kousuke Nakano, Hiroshi Takatsu, Taito Murakami, Kenta Hongo, Ryo Maezono, Hiraku Ogino, Dongjoon Song, Craig Brown, Tassel Cedric, Hiroshi Kageyama
Square-planar coordinate Ni 2+ ions in oxides are exclusively limited to a low spin state (S = 0) owing to extensive crystal field splitting. Here we report layered oxychalcogenides A 2NiO 2Ag 2Se 2 (A = Sr, Ba) with the S = 1 NiO 2 square lattice. The
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