Materials Literature
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Europium‐doped yttrium aluminum garnet (YAG) phosphor particles were prepared from mixed nitrate solutions by the FEAG (filter expansion aerosol generator) process. The crystallinity, morphology, and luminescence of the YAG:Eu particles were investigated. The prepared particles had an amorphous phase, which turned int…
The performance of a solid oxide fuel cell utilizing hydrogen sulfide as a fuel was studied with , , and anode materials. The electrolyte was yttria‐stabilized zirconia with a thickness ranging from 40–500 μm. Power densities of over were obtained with the Li/Co sulfide based material and gas analysis demonstrated hyd…
Thermoluminescence modelling started with very simple models of highly localised point defects, and separation of trapping and recombination centres. Whilst these ideas still dominate the discussions, current research indicates that most defects are far more complex, with localised transitions, and defect interactions…
Aliphatic poly(ester-amide)s were prepared by polycondensation of N,N′-1,4 butanediylbis(6-hydroxyhexanamide), dimethyl adipate, and 1,4-butanediol, using Ti(OBu)4 as a catalyst. For polymers with a bisamide monomer content below 25 mol-%, Mw between 20 000 and 50 000 were obtained after 10–12 h polymerization at temp…
Poly(furfuryl alcohol) with M n = 2–2.2 × 103 was prepared using p-toluenesulphonic acid in methylene chloride. Polymer structures were determined by 1H and 13C NMR spectroscopy. The 1H NMR spectrum indicated the predominance of linear sequences and the absence of CH2OCH2bonds in the polymer. The 13C NMR spectrum…
Porous silica frameworks containing well-dispersed metal particles are particularly important in catalysis. These authors report a method for direct inclusion of metal nanoparticles into a host framework, thus circumventing the need for post-synthesis functionalization of the support. The method involves a new molecul…
CdS/HgS/CdS nanoparticles consist of a CdS core, epitaxially covered by one or two monolayers of HgS, and additional cladding layers of CdS. The luminescence spectrum of the studied materials contains a dominant exciton band located at the HgS layer and an additional nonexcitonic band, presumably corresponding to the…
The excitation wavelength dependence of time-resolved EPR is used to demonstrate the pathway of intramolecular energy transfer in a covalently linked copper(II)−free base porphyrin dimer. Spin polarized spectra are presented for selective excitation of both the copper(II) porphyrin donor (at 540 nm) and the free base…
Abstract Formation of kaolinite-smectite (K-S) mixed layers in a soil toposequence developed from basaltic parent material was examined. The soil formed in a temperate climate with alternating dry and wet seasons in Sardinia (Italy). Chemical composition and charge characteristics of the smectite component in the K-S…
The preparation of dense homogeneous zirconia‐toughened alumina (ZTA) with high dry‐sliding wear resistance is described. These ZTA ceramics are obtained by sintering green compacts, made by colloidal filtration of well‐defined ZrO 2 ‐Al 2 O 3 particle suspensions, for 2 h at 1400°C. The optimum solid and stabilizer c…
Abstract Double hydroxide solids precipitated homogeneously from three laboratory-synthesized aqueous solutions that simulated mildly contaminated surface or groundwater. Over a limited pH range, precipitates formed rapidly from dissolved ions, and more slowly by incorporating ions dissolving from other solids, includ…
Quantum chemical ab initio calculations are performed for the magnetic exchange coupling in binuclear chlorine-bridged Co(II) complexes of the form L 3 CoCl 3 CoL 3 . In order to simplify the calculations, the terminal ligands are replaced with He-type model ligands L. The calculations are carried out at the restricte…
The development of new electrode materials has expanded the range and classes of detectable compounds using electroanalytical methods. Conducting electroactive polymers (CEPs) have been demonstrated to have remarkable sensing applications through their ability to be reversibly oxidized or reduced by applying electrica…
The possible use of ozone to produce higher oxides was analyzed thermodynamically. Because the activity of oxygen in ozone is ∼10 18 at room temperature and ∼10 8 at 773 K, ozone may react with metals to yield higher‐oxidation‐state products than does an ambient pressure of pure oxygen. In agreement with this thermody…
The effect of a patterned surface on the phase separation kinetics of a thin polymer film has been investigated using the Cahn–Hilliard–Cook model in three dimensions with the addition of a short range surface potential. We have observed pattern-induced spinodal waves perpendicular to the surface creating “checkerboar…
The ionic conductivity and relaxation in the lithium tellurite glasses with varying ${\mathrm{Li}}_{2}\mathrm{O}$ content have been investigated in the frequency range 10 Hz to 2 MHz and in the temperature range from 373 K to just below the glass transition temperature. The composition dependences of the dc conductivi…
W e analyse the influence of charged impurities and flexoelectric polarization on the optical transmission of a hybrid aligned nematic liquid crystal cell. The theoretical results obtained within the framework of the Poisson-Boltzmann equation and Frank elastic theory are compared with the observed optical response [N…
Phase properties of gradient AB copolymer melts which consist of chains with the specified chemical distribution of A and B monomers have been studied within the Landau–Ginzburg model. All the melts with the linear distribution of the monomers exhibit only a direct continuous phase transition from disordered to the la…
A method of radiation dosimetry is described using pulsed optically stimulated luminescence (POSL). An irradiated sample is stimulated with a series of light pulses from a laser tuned to an appropriate wavelength. The emitted light, due to the detrapping of charges and their subsequent recombination with charges of th…
When phosphorylated, the dimeric form of nitrogen regulatory protein C (NtrC) of Salmonella typhimurium forms a larger oligomer(s) that can hydrolyze ATP and hence activate transcription by the sigma(54)-holoenzyme form of RNA polymerase. Studies of Mg-nucleoside triphosphate binding using a filter-binding assay indic…