scholarly journals Direct observation of spin correlations in an artificial triangular lattice Ising spin system with grazing-incidence small-angle neutron scattering

2021 ◽  
Author(s):  
Petai Pip ◽  
Artur Glavic ◽  
Sandra Helen Skjærvø ◽  
Anja Weber ◽  
Andrew Smerald ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Spin System ◽  
Small Angle ◽  
Triangular Lattice ◽  
Small Angle Neutron Scattering ◽  
Grazing Incidence ◽  
Spin Correlations ◽  
Ising Spin ◽  
Ising Spin System ◽  
Frustrated Spin

Short-range correlations in the highly frustrated spin-liquid state of an artificial triangular-lattice Ising spin system were measured using grazing incidence small-angle neutron scattering and quantified using an empirical structure factor.

Conceptual design of the grazing-incidence focusing small-angle neutron scattering (gif-SANS) instrument at CPHS

2021 ◽  
pp. 1-5
Author(s):  
Huarui Wu ◽  
Weihang Hong ◽  
Yao Zhang ◽  
Pulin Bai ◽  
Wenbo Mo ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Conceptual Design ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
High Performance ◽  
Grazing Incidence ◽  
The Other ◽  
Tsinghua University ◽  
Neutron Sources ◽  
Sans Instrument

Developing small-angle neutron scattering techniques at compact accelerator-driven neutron sources (CANS) is of great importance for expanding the user community and advancing CANS capability. At the Compact Pulsed Hadron Source (CPHS) at Tsinghua University, neutron-focusing mirrors are under intensive research to address the challenge. A grazing-incidence focusing SANS (gif-SANS) project is initialized. It employs a nested supermirror assembly with a large collecting area to achieve ⩾ 10 5 n/s neutron intensity at Q min ⩽ 0.007 Å − 1 . It will equip two detectors, one being a 3He detector for normal Q-range measurements, and the other being a high-resolution detector for extending the Q min down to 10 − 3 Å − 1 . In this work, we present the conceptual design of the gif-SANS at CPHS. Such a scheme is conducive to enable high-performance SANS measurements at CANS.

scholarly journals Microstructure and water distribution in catalysts for polymer electrolyte fuel cells, elucidated by contrast variation small-angle neutron scattering

2019 ◽  
Vol 52 (4) ◽  
pp. 791-799 ◽  
Author(s):  
Satoshi Koizumi ◽  
Satoru Ueda ◽  
Takumi Inada ◽  
Yohei Noda ◽  
Robert A. Robinson
Keyword(s):  
Fuel Cells ◽  
Neutron Scattering ◽  
Polymer Electrolyte ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Water Distribution ◽  
Grazing Incidence ◽  
Polymer Electrolyte Fuel Cells ◽  
Contrast Variation ◽  
Mixed Water

By using small-angle neutron scattering (SANS) reinforced by scanning electron microscopy, the fine structure of catalysts for polymer electrolyte fuel cells has been investigated. The experimental data resulting from contrast variation with mixed light and heavy water (H2O/D2O) are well described by a core–shell model with fluctuations in concentration between water and Nafion. In particular, SANS obtained with the mixed water ratio 30/70, which corresponds to a matching point between mixed water and Nafion, shows a broad scattering maximum, which is attributed to a 5 nm-thick Nafion shell on the surface of the larger carbon particles. After swelling by water, the ionomer layer absorbs water at the 17 wt% level. By changing the H2O/D2O ratio, it was further confirmed that the catalyst with the ionomer exhibits water repellence, whereas the bare catalyst without the ionomer is wetted by water. Because it is very difficult to extract more information, for instance regarding the Pt–Nafion interactions, by means of small-angle scattering, reflectometry and grazing-incidence scattering experiments with neutrons should be attempted on a model catalyst prepared on a flat substrate.

scholarly journals Time-of-flight grazing incidence small angle neutron scattering on Gd nanowires

2009 ◽  
Vol 167 (1) ◽  
pp. 73-79 ◽  
Author(s):  
W. Kreuzpaintner ◽  
J.-F. Moulin ◽  
D. Lott ◽  
R. Kampmann ◽  
M. Haese-Seiller ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Time Of Flight ◽  
Grazing Incidence

Partial Disordered Phase of Ising Spin System in Distorted Triangular Lattice RbCoBr3

2008 ◽  
Vol 77 (10) ◽  
pp. 104703 ◽  
Author(s):  
Yoichi Nishiwaki ◽  
Tota Nakamura ◽  
Akira Oosawa ◽  
Kazuhisa Kakurai ◽  
Norikazu Todoroki ◽  
...  
Keyword(s):  
Spin System ◽  
Triangular Lattice ◽  
Ising Spin ◽  
Disordered Phase ◽  
Ising Spin System
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