OpenAccess

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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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2021-03-27
11:28

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2021-03-27
11:28
Embargoed OpenAccess [FZJ-2021-01376] Journal Article
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Dramatic impact of intermediate-valence impurity on induced magnetism in singlet ground state system PrNi
We studied the influence of La (nonmagnetic) and Ce (intermediate valence) impurities on the ferromagnetic ordering temperature Tc of compounds RE1-x(La,Ce)xNi (RE = Pr, Gd). The ordering temperature Tc was measured in a wide range of impurity concentration. [...]

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2021-03-25
11:28
OpenAccess [FZJ-2021-01372] Journal Article
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Response of a Li-glass/multi-anode photomultiplier detector to collimated thermal-neutron beams
The response of a position-sensitive Li-glass scintillator detector being developed for thermal-neutron detection with 6 mm position resolution has been investigated using collimated beams of thermal neutrons. The detector was moved perpendicularly through the neutron beams in 0.5 to 1.0 mm horizontal and vertical steps. [...]
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2021-03-21
11:28
OpenAccess [FZJ-2020-04512] Journal Article
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Clamp cells for high pressure neutron scattering at low temperatures and high magnetic fields at Heinz Maier-Leibnitz Zentrum (MLZ)
We report on the feasibility of high pressure neutron scattering in clamp cells at various diffraction and spectroscopy beamlines in the Heinz Maier-Leibnitz Zentrum in Garching (Germany). The cells are compact in order to fit into the existing sample environment devices and to accommodate samples up to about 150 mm³ at pressures above 1 GPa..
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2021-03-19
11:28
Embargoed OpenAccess [FZJ-2021-01368] Journal Article
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Melts of single-chain nanoparticles: A neutron scattering investigation
Journal of applied physics 127(4), 044305 - () [10.1063/1.5140705]
The impact of purely intramolecular cross-linking on the properties of a polymer melt is studied by neutron diffraction and quasielastic incoherent and coherent neutron scattering on a system composed exclusively of single-chain nanoparticles. As a reference, a parallel study is presented on the melt of the linear precursor chains’ counterpart. [...]

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2021-03-17
11:32
OpenAccess [FZJ-2020-05229] Journal Article
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Adjustable polystyrene nanoparticle templates for the production of mesoporous foams and ZnO inverse opals
The manifold applications of porous materials, such as in storage, separation, and catalysis, have led to an enormous interest in their cost-efficient preparation. A promising strategy to obtain porous materials with adjustable pore size and morphology is to use templates exhibiting the appropriate nanostructure. [...]
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2021-03-17
11:32
OpenAccess [FZJ-2020-04737] Journal Article
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Effect of cosolvent on the rheological properties and self-assembled structures from telechelic polyampholytes
A triblock copolymer with hydrophobic end blocks and a polyampholytic middle block is investigated in a mixture of water and acetone with a focus on the dependence of the rheological properties and of the micellar structure and correlation on the content of acetone. The polymer under study is PMMA86-b-P(DEA190-co-MAA96)-b-PMMA86, where PMMA stands for poly(methyl methacrylate) and P(DEA-co-MAA) for poly(2-(diethylamino) ethyl methacrylate-co-methacrylic acid). [...]
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