Materials Literature
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The recent upsurge of interest in contrast agents for magnetic resonance imaging, of luminescent chemosensors for medical diagnostic, and lately, for optical imaging of cells has generated an impressive momentum for the coordination and supramolecular chemistry of trivalent lanthanide ions. We shortly review the synth…
Abstract The thermal decomposition of freeze‐dried Li‐Mn(II)‐Fe(III)‐formate precursors was investigated by means of DTA, TG and mass spectroscopy. By the thermal treatment of the prefired precursors between 400 and 1000°C, single phase solid solutions Li x Mn 1+x Fe 2–2x O 4 (0 ≤ x ≤ 1) with cubic spinel structure we…
Two new isotypic triple molybdates, namely tricesium lithium dicobalt tetrakis(tetraoxomolybdate), Cs3LiCo2(MoO4)4, and trirubidium lithium dizinc tetrakis(tetraoxomolybdate), Rb3LiZn2(MoO4)4, crystallize in the non-centrosymmetric cubic space group I-43d and adopt the Cs6Zn5(MoO4)8 structure type. In the parent struc…
Abstract The kinetics of spontaneous crystallization of sodium chloride from aqueous‐ethanol solutions were studied. During the crystallization the electrical conductance and optical transmission of the supersaturated solutions were measured automatically. For monitoring of the total surface of growing potassium chlor…
We studied the mechanical behavior of densely packed (up to approximately 30% v/v), sedimented layers of (1 microm) water-in-oil W/O emulsion droplets, upon indentation with a (10 microm) large spherical probe. In the presence of attractive forces, the droplets form solid like networks which can resist deformation. Ad…
We report the observation of nonreciprocal magnetoelectric x-ray scattering (MEXS) in globally centrosymmetric crystal of magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4})$. At the (222) Bragg reflection, resonant MEXS was observed around the pre-edge region of Fe $K$ absorption. This unique scattering, being distinct fr…
Alginate is a major constituent of mature biofilms produced by Pseudomonas aeruginosa. The penultimate step in the biosynthesis of alginate is the conversion of some beta-D-mannuronate residues in the polymeric substrate polymannuronan to alpha-L-guluronate residues in a reaction catalyzed by C5-mannuronan epimerase.…
Abstract The influence of soda lignin and thiolignin on the mechanical properties (tensile strength and elongation at rupture) as well as on the dielectric properties (conductivity (σ), permittivity (ϵ′), dielectric loss (ϵ″), and dielectric relaxation time (τ)) of their composites with natural rubber (NR) was investi…
In this paper, we report the preparation of one-dimensional (1D) nanostructures from layered compounds (2D). γ-MnOOH nanorods were successfully prepared from platelike layered Na-birnessite by simple hydro(solvo)thermal treatment at low temperature. It was observed that the reaction medium plays an important role in t…
We measured the temperature-dependent photoluminescence (PL) decay time of the mixed system of free exciton (FX) and donor-bound exciton (DX0) in a ZnO thin film. From the measured cw PL spectra, we also calibrated the individual spectral widths and integrated PL intensities of FX and DX0 by fitting the spectra with f…
The structures and vibrational frequencies of the type II Anderson heteropolyanions [TeMo6O24]6- and [IMo6O24]5- have been calculated by using density functional theory using a number of common functionals and basis sets. For the first time, Raman intensities have been calculated and the effect of solvent on the model…
Abstract Recharging processes of chromium ions were investigated for Mg 2 SiO 4 :Mg, Cr single crystals using annealing in O 2 and in air and γ‐irradiation, as compare to YAG :Ca, Cr single crystals. The formation of tetravalent Cr ions in the Mg 2 SiO 4 :Mg, Cr is related not only to the initial Cr content in the mel…
Interpenetrating polymer networks (IPNs) with spatially graded co-continuous structures were constructed by photo-cross-linking a homogeneous mixture of photo-reactive polystyrene and methyl methacrylate monomer. For a given thickness, irradiation with weak ultraviolet (UV) light results in a co-continuous morphology…
We report on the observation of optical gain from InAs nanocrystal quantum dots which emit at 1.55microns and are imbedded in a novel polymer platform. The measurements are based on a three-beam time resolved pump-probe technique, which enables extracting the intrinsic gain cross section, lifetime, and recovery time.…
The phase stability of polycrystalline BiFeO3−δ (BFO) was measured using coulometric titration in the technologically important temperature range for growth of epitaxial thin films, 680°C–800°C. BFO exhibits only a very narrow oxygen nonstoichiometry, i.e., δ<0.01. For the most nonstoichiometric sample obtainab…
Initial attempts to prepare new Ln-Cd-Te-O-Cl compounds led to the isolation of two novel cadmium tellurium(IV) oxychlorides with two different types of structures, namely, [Cd(2)(Te(6)O(13))][Cd(2)Cl(6)] and Cd(7)Cl(8)(Te(7)O(17)). Both compounds feature novel polymeric tellurium(IV) oxide anions and unusual cadmium…
Abstract In this study, the effect of Fe powder on the physical and mechanical properties of high density polyethylene (HDPE) was investigated experimentally. HDPE and HDPE containing 5, 10, and 15 vol % Fe metal–polymer composites were prepared with a twin screw extruder and injection molding. After this, fracture su…
The title compound, [Ru(2)(O(2)CCF(3))(4)] (1), has been obtained without any exogenous ligands and crystallized by deposition from the gas phase at 170 degrees C. Its crystal structure has been determined for the first time to confirm an infinite chain motif built on axial Ru...O interactions of the diruthenium(II,II…
We have determined the dispersion of acoustic and optical surface phonon modes 2H-NbSe2 at the by inelastic x-ray scattering under grazing incidence conditions. Already, at room temperature, an anomaly is observed close to the charge density wave -vector position located at about one-third along the Gamma-M direction…
Abstract II‐VI semiconductor nanoparticles have recently attracted a lot of attention due to the possibility of their application in various devices. In the present study, chemical method has been used in synthesis of CdS nanoparticles and thiophenol was used as capping agent. X‐ray diffraction studies of both samples…