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2021-08-05
11:28
OpenAccess [FZJ-2021-03126] Journal Article
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Comparison of the temperature- and pressure-dependent behavior of the crystal structure of CrAs
The crystal structure of CrAs was investigated using synchrotron X-ray single-crystal diffraction for separate dependences on temperature (30–400 K) and on pressure (0–9.46 GPa). The isosymmetrical magnetostructural phase transition at TN = 267 K can induce a change in the microstructure by twinning due to a crossing of the orthohexagonal setting of the unit-cell parameter ratio c/b. [...]
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2021-07-16
11:28
OpenAccess [FZJ-2021-02090] Journal Article
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Unravelling Magnetic Nanochain Formation in Dispersion for In Vivo Applications
Advanced materials 33(24), 2008683 () [10.1002/adma.202008683]
Self-assembly of iron oxide nanoparticles (IONPs) into 1D chains is appealing, because of their biocompatibility and higher mobility compared to 2D/3D assemblies while traversing the circulatory passages and blood vessels for in vivo biomedical applications. In this work, parameters such as size, concentration, composition, and magnetic field, responsible for chain formation of IONPs in a dispersion as opposed to spatially confining substrates, are examined. [...]
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2021-07-04
11:28
OpenAccess [FZJ-2021-02424] Journal Article
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Differentiation between strain and charge mediated magnetoelectric coupling in La 0.7 Sr 0.3 MnO 3 / Pb(Mg 1/3 Nb 2/3 ) 0.7 Ti 0.3 O 3 (001)
Magnetoelectric (ME) coupling in La0.7Sr0.3MnO3/Pb(Mg1/3Nb2/3)0.7Ti0.3O3 (LSMO/PMN–PT (001)) has been probed in the past years to identify the underlying mechanism behind it. PMN–PT, which is well known for its excellent piezoelectric properties, also exhibits ferroelectricity. [...]
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2021-07-04
11:28
OpenAccess [FZJ-2021-01192] Journal Article

Scattering of multicomponent polymer blends
The random phase approximation for polymer blends was developed by H. Benoît and described small angle scattering functions as well as mean field phase boundaries. [...]
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2021-06-02
11:28
OpenAccess [FZJ-2021-02377] Journal Article
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Silica Fouling in Reverse Osmosis Systems–Operando Small-Angle Neutron Scattering Studies
Membranes 11(6), 413 - () [10.3390/membranes11060413]
We present operando small-angle neutron scattering (SANS) experiments on silica fouling at two reverse osmose (RO) membranes under almost realistic conditions of practiced RO desalination technique. To its realization, two cells were designed for pressure fields and tangential feed cross-flows up to 50 bar and 36 L/h, one cell equipped with the membrane and the other one as an empty cell to measure the feed solution in parallel far from the membrane. [...]
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2021-05-18
11:28
OpenAccess [FZJ-2021-01528] Journal Article
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Cooperative Chain Dynamics of Tracer Chains in Highly Entangled Polyethylene Melts
By neutron spin echo spectroscopy, we have studied the center of mass motion of short tracer chains on the molecular length scale within a highly entangled polymer matrix. The center of mass mean square displacements of the tracers independent of their molecular weight is subdiffusive at short times until it has reached the size of the tube d; then, a crossover to Fickian diffusion takes place. [...]
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2021-04-27
11:28
OpenAccess [FZJ-2021-00038] Journal Article
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Deep learning for X-ray or neutron scattering under grazing-incidence: extraction of distributions
Grazing-incidence small-angle scattering (GISAS) is a technique of significant importance for the investigation of thin multilayered films containing nano-sized objects. It provides morphology information averaged over the sample area. [...]
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2021-04-10
11:28
OpenAccess [FZJ-2021-01626] Journal Article
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Revealing the Absolute Direction of the Dzyaloshinskii-Moriya Interaction in Prototypical Weak Ferromagnets by Polarized Neutrons
Polarized neutron diffraction (PND) is a powerful technique to distinguish a weak magnetic contribution from the total scattering intensity. It can provide a detailed insight into the microscopic spin ordering at the unit cell level, but also into the mesoscopic magnetic ordering, like different types of domain populations. [...]
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2021-04-10
11:28
OpenAccess [FZJ-2021-01551] Journal Article
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Grazing Incidence Small-Angle Neutron Scattering: Background Determination and Optimization for Soft Matter Samples
Applied Sciences 11(7), 3085 - () [10.3390/app11073085]
Grazing incidence small-angle neutron scattering (GISANS) provides access to interfacial properties, e.g., in soft matter on polymers adsorbed at a solid substrate. Simulations in the frame of the distorted wave Born approximation using the BornAgain software allow to understand and quantify the scattering pattern above and below the sample horizon, in reflection and transmission, respectively. [...]
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2021-03-27
11:28
OpenAccess [FZJ-2021-01527] Journal Article

Numerically stable form factor of any polygon and polyhedron
Coordinate-free expressions for the form factors of arbitrary polygons and polyhedra are derived using the divergence theorem and Stokes's theorem. Apparent singularities, all removable, are discussed in detail. [...]
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