Materials Literature
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The chirality-dependent magnetoelectric properties of Neel-type domain walls in iron garnet films is observed. The electrically driven magnetic domain wall motion changes the direction to the opposite with the reversal of electric polarity of the probe and with the chirality switching of the domain wall from clockwise…
Au pairs: Whereas one methane molecule is not dehydrogenated by free gold-dimer cations, the cooperative interaction of two methane ligands initiates a catalytic formation of ethylene. The cycle is closed by the adsorption of a third methane molecule that cooperatively activates the release of ethylene (see scheme yel…
A new phenomenological approach to spatially-resolved research of nonlinear (NL) microwave properties of operating thin-film superconducting resonators is proposed. The approach is based on frequency and spatial singularity of Laser Scanning Microscopy (LSM) images that can be extracted from a set of 2-D patterns repr…
The dynamic generalization of the Peierls-Nabarro equation for dislocations cores in an isotropic elastic medium is derived for screw and edge dislocations of the ``glide'' and ``climb'' type, by means of Mura's eigenstrains method. These equations are of the integrodifferential type and feature a nonlocal kernel in s…
The electron-phonon coupling in potassium-doped graphene on Ir(111) is studied via the renormalization of the ${\ensuremath{\pi}}^{\ensuremath{\ast}}$ band near the Fermi level, using angle-resolved photoemission spectroscopy. The renormalization is found to be fairly weak and almost isotropic, with a mass enhancement…
The present paper discusses a Non Destructive Evaluation (NDE) technique involving Compton back-scattering. Two 15 cm x 15 cm x 15 cm cubical concrete blocks were scanned for detection of voids. The setup used a PC controlled gamma scattering scanning system. A 137Cs radioactive source of strength 153.92 GBq with lead…
We report on the emission of hybrid nanosources composed of gold nanoparticles coupled with quantum dots. The emission relies on energy transfer from the quantum dots to gold nanoparticles which could be de-excited through radiative plasmon relaxation. The dependence of the emission efficiency is studied systematicall…
Magnetization and its relaxation have been measured in $\text{Ba}{({\text{Fe}}_{1\ensuremath{-}x}{\text{Co}}_{x})}_{2}{\text{As}}_{2}$ single crystals at various doping levels ranging from very underdoped to very overdoped regimes. A sizable magnetization-relaxation rate has been observed in all samples, indicating a…
The enhancement of second-harmonic generation (SHG) efficiency by urea doping in tristhioureazinc(II) sulfate (ZTS) single crystals and its correlation with crystalline perfection have been investigated. ZTS is a potential semiorganic nonlinear optical material. Pure and urea-doped single crystals of ZTS have been suc…
Hydrogen storage properties have been studied on newly designed three-dimensional covalent-organic framework (3D-COF). The design of these materials was based on the ctn network of the ultralow density COF-102. The structures were optimized by multiscale techniques and the optimized structures were checked for their s…
The surface enhanced Raman scattering (SERS) spectrum of a reporter molecule attached to gold or silver nanostructures, which is pH-sensitive, can deliver information on the local pH in the environment of the nanostructure. Here, we demonstrate the use of a mobile SERS nanosensor made from gold nanaoaggregates and 4-m…
The deposition of atomically thin highly uniform chemically derived graphene (CDG) films on 300 mm SiO(2)/Si wafers is reported. We demonstrate that the very thin films can be lifted off to form uniform membranes that can be free-standing or transferred onto any substrate. Detailed maps of thickness using Raman spectr…
The energies of different spin multiplicities of a range of iron complexes are computed using modern density functional theory (DFT) methods of the generalized gradient approximation (GGA; BP86 and OPBE), meta-GGA (TPSS), hybrid meta-GGA (TPSSh), hybrid (B3LYP), and double-hybrid (B2PLYP) types. It is shown that so fa…
This study deals with the tensile drawing behavior of a polylactide material containing 4% of d -stereoisomer units, in the amorphous state. The draw temperature domain spanned from the glass transition to the onset of thermal crystallization, namely 70−100 °C. The stress−strain curves exhibit a strain-hardening stron…
Polarity-dependent fluorescent probes are recently attracting interest for high-resolution cell imaging. Following a stepwise rational approach, we prepared and tested a toolbox of new coumarin derivatives tailored to in vivo imaging applications. Our compounds are characterized by a donor-(coumarin core)-acceptor mol…
Nanoparticles (NPs) are reported to be a potential environmental health hazard. For organisms living in the aquatic environment, there is uncertainty on exposure because of a lack of understanding and data regarding the fate, behavior, and bioavailability of the nanomaterials in the water column. This paper reports on…
Natural fiber-reinforced composites are finding new applications in many sectors. In certain industries, such as building and transport, reduced material flammability is a key requirement. Knowledge of the flammability of natural fiber-reinforced composites and the methods used to improve their fire resistance is nece…
The site-specific engineering of colloidal surfaces has provided a powerful approach to pushing the boundaries of today's materials research. The resulting surface-anisotropic and patchy particles have become the center of vital research areas, ranging from the need for large-scale fabrication techniques to exploring…
Three europium-doped pyrochlores including La2Zr2O7:Eu, La2Hf2O7:Eu, and Nd2Zr2O7:Eu were tested to determine their lifetimes as a function of temperature. These pyrochlores were examined to determine their suitability as thermographic phosphors, in systems that use these materials for thermal barrier coatings. Result…
Two compounds based on polyoxometalates, (4,4′-H2bpy)7(4,4′-Hbpy)[]2[] ·10H2O (1) and (4,4′-H2bpy)6(4,4′-bpy)[]2 · 18H2O (2), have been prepared under hydrothermal conditions and characterized by IR, XPS spectra, TG analyses, and single crystal X-ray diffraction. Both compounds consist of 4,4′-bipyridine units and pol…