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Over the decades, small-angle neutron scattering has became a definitive method for structural investigation on the mesoscale between a few Angstrom up to a few 100 nm. This makes it an indispensable tool for non-destructive material investigations in fields ranging from chemistry and biology, over material sciences to solid state physics, especially taking into account the fundamental nature of neutrons, which makes it possible to probe different isotopes and, therefore, enhance contrast by choosing an appropriate isotope distribution or to probe the spin state of the investigated materials. This Special Issue is dedicated to elucidate the advances made with SANS over the last few years, which includes new instrumentation, sample environment and experimental control, as well as novel approaches and experimental techniques. The ideas and approaches collected here will serve both the experienced experimenter as well as the novice to appraise whether their specific experimental setup is feasible with new ideas.

SANS --- neutron scattering --- instrument control --- data acquisition --- user facility --- GUI --- simulation --- GISANS --- BornAgain Software --- grazing incidence scattering --- small-angle neutron scattering --- SKADI --- ESS --- European Spallation Source --- sample environment --- 3D printed --- humidity chamber --- thin films --- dynamic light scattering --- small angle neutron scattering --- instrumentation --- microgels --- ultra-small-angle neutron scattering --- magnetoactive elastomer --- magnetorheological elastomer --- hysteresis --- restructuring of the filler --- foams --- colloidal superballs --- colloidal monolayers --- SAXS --- scattering --- form factor --- FTIR --- DLS --- semi-crystalline polymers --- proteins in buffer solution --- soft matter --- time-resolved --- sample environments --- small angle X-ray scattering --- SAS --- nanomaterials --- n/a

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This book, titled “Ionic Conductive Membranes for Fuel Cells”, from the journal Membranes, discusses the state of the art and future developments in the field of polymer electrolyte membranes for fuel cells, an efficient and clean system for converting fuel into energy.

proton exchange membranes --- PEMFC --- PFSA annealing --- hydration --- nc index --- PPSU --- High IEC, CSPPSU --- activation --- PEMFCs --- PVA:CS polymer blend --- NH4I salt --- XRD and FESEM --- impedance --- dielectric properties --- TNM and LSV study --- fuel cell technology --- energy --- polymer electrolyte membrane fuel cells (PEMFCs) --- solid oxide fuel cells (SOFCs) --- direct methanol fuel cells (DMFCs) --- reverse electrodialysis --- Nafion --- brine --- semi-crystalline polymers --- small-angle neutron scattering --- bioremediation --- renewable energy --- organic pollutants --- electrogens --- wastewater --- proton exchange membrane fuel cells --- radical scavengers --- halloysite --- cerium oxide --- PEM --- PEFC --- ionomer --- polymer electrolyte membrane --- polymer electrolyte membrane fuel cell --- proton exchange membrane --- proton exchange membrane fuel cell --- n/a

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Molecular magnets show many properties not met in conventional metallic magnetic materials, i.e. low density, transparency to electromagnetic radiation, sensitivity to external stimuli such as light, pressure, temperature, chemical modification or magnetic/electric fields, and others. They can serve as “functional” materials in sensors of different types or be applied in high-density magnetic storage or nanoscale devices. Research into molecule-based materials became more intense at the end of the 20th century and is now an important branch of modern science. The articles in this Special Issue, written by physicists and chemists, reflect the current work on molecular magnets being carried out in several research centers. Theoretical papers in the issue concern the influence of spin anisotropy in the low dimensional lattice of the resulting type of magnet, as well as thermodynamics and magnetic excitations in spin trimers. The impact of external pressure on structural and magnetic properties and its underlying mechanisms is described using the example of Prussian blue analogue data. The other functionality discussed is the magnetocaloric effect, investigated in coordination polymers and high spin clusters. In this issue, new molecular magnets are presented: (i) ferromagnetic high-spin [Mn6] single-molecule magnets, (ii) solvatomagnetic compounds changing their structure and magnetism dependent on water content, and (iii) a family of purely organic magnetic materials. Finally, an advanced calorimetric study of anisotropy in magnetic molecular superconductors is reviewed.

molecular magnetism --- phase diagram --- superconductivity --- molecular magnets --- magnetism --- thermodynamics --- ?-d system --- cyclam --- critical behaviour --- redox --- exact diagonalization --- salicylamidoxime --- thermodynamic measurement --- magnetic conductor --- quantum magnet --- radical anion --- single crystal heat capacity measurement --- effect of high pressure --- square lattice --- single-molecule magnets --- cyano bridge --- Berezinskii-Kosterlitz-Thouless phase transition --- coordination polymers --- Prussian blue analogues --- chain --- antiferromagnetism --- dioxothiadiazole --- inelastic neutron scattering --- spin anisotropy --- rectangular lattice --- superexchange interaction --- Heisenberg exchange Hamiltonian --- Heisenberg --- S = 1/2 XXZ model --- antiferromagnetic coupling --- manganese(III) --- spin clusters --- magnetic properties --- magnetocaloric effect --- crystal structure --- copper(II) --- octacyanotungstate(V) --- octacyanometallates

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The present collection of articles focuses on different aspects of topological-materials studies. Recent progress in both, theoretical and experimental, studies is covered in this Special Issue. A particular stress is given on different optical investigations, as well as on recent band-structure calculations. Besides, neutron scattering experiments, crystal growth, and a number of theoretical models for different topological systems are discussed.

topological insulators --- optical conductivity --- Dirac materials --- Weyl nodes --- screw rotation symmetry --- line node --- space group 19 --- space group 61 --- cyclotron resonance --- crystal growth --- optical floating zone method --- SmB6 --- Sm1-xCexB6 --- topological insulator --- kondo insulator --- topology --- chirality --- multifold semimetal --- optics --- DFT --- topological semimetal --- cobalt monosilicide --- mechanical deformation --- quantum anomalous Hall effect --- Faraday rotation --- terahertz spectroscopy --- inelastic neutron scattering --- topological materials --- anomalous Hall effect --- isotropic ferromagnet --- kagome --- frustrated magnetism --- skyrmion --- magnetization --- optical-conductivity scaling --- topological semimetals --- band structures --- high Chern numbers --- bulk-edge correspondence --- Weyl semimetals --- band-structure calculations --- optical response --- n/a

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This book describes the results of both theoretical and experimental research on many topical issues in intramolecular hydrogen bonding. Its great advantage is that the presented research results have been obtained using many different techniques. Therefore, it is an excellent review of these methods, while showing their applicability to the current scientific issues regarding intramolecular hydrogen bonds. The experimental techniques used include X-ray diffraction, infrared and Raman spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR), nuclear quadrupole resonance spectroscopy (NQR), incoherent inelastic neutron scattering (IINS), and differential scanning calorimetry (DSC). The solvatochromic and luminescent studies are also described. On the other hand, theoretical research is based on ab initio calculations and the Car–Parrinello Molecular Dynamics (CPMD). In the latter case, a description of nuclear quantum effects (NQE) is also possible. This book also demonstrates the use of theoretical methods such as Quantum Theory of Atoms in Molecules (QTAIM), Interacting Quantum Atoms (IQA), Natural Bond Orbital (NBO), Non-Covalent Interactions (NCI) index, Molecular Tailoring Approach (MTA), and many others.

intramolecular interaction --- interaction energy --- hydrogen bond --- intramolecular hydrogen bonds --- deuterium isotope effects on chemical shifts --- isotope ratios --- hydrogen bond energies --- intramolecular hydrogen bonding --- high-accuracy extrapolation methods --- QTAIM --- non-covalent interactions --- local vibrational modes --- hydrogen bond (HB) --- intramolecular hydrogen bond (IHB) --- molecular tailoring approach (MTA) --- fragmentation methods --- bond energy estimation --- noncovalent interactions --- structures and binding energies --- charge-transfer interactions --- spin–spin coupling constants --- polymorphism --- isomerization --- phase transition --- nitro group --- matrix isolation --- IINS --- FT-IR --- Raman --- X-ray --- NQR --- DSC --- DFT --- Schiff base --- N-salicylidene aniline derivative --- photophysical properties --- solvatochromism --- Hirshfeld surface analysis --- amino-alcohols --- α-substitution --- beryllium bonds --- calculated infrared spectra --- interacting quantum atoms --- resonance-assisted hydrogen bond --- Schiff bases --- inelastic incoherent neutron scattering --- isotopic effect --- excited-state intramolecular proton transfer --- photochemistry --- photobiology --- quantum chemistry --- molecular dynamics --- ultrafast processes --- gas phase --- crystalline phase --- MP2 --- CCSD --- AIM --- SAPT --- nuclear quantum effects --- CPMD --- n/a --- spin-spin coupling constants