Materials Literature
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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…
Dramatically different cavitation was produced by two separate acoustic pulses that had different shapes but similar duration, frequency content, and peak positive and negative pressure. Both pulses were produced by a Dornier HM-3 style lithotripter: one pulse when the ellipsoidal reflector was rigid, the other when t…
The mechanism of the light emission of single-bubble sonoluminescence (SBSL) is studied theoretically based on the quasiadiabatic compression model. It is concluded that SBSL is not the blackbody radiation but the thermal radiation. It is clarified that the shape of the spectrum is determined by the temperature inside…
The XPS technique in combination with microcalorimetry was used to picture the acid character of metal ion loaded zeolite and silica−alumina samples. Co, Cu, and Ni ions were loaded on ZSM-5 and SiO 2 −Al 2 O 3 (about 1 mmol/g) by three different procedures: ion exchange, impregnation, and solid-state ion-exchange. Th…
Non-covalently attached or soluble cell wall proteins of Saccharomyces cerevisiae were extracted using a high pH/2-mercaptoethanol procedure and were separated for peptide sequencing using 2D-PAGE. A partial N-terminal sequence of a major protein spot was obtained and showed high identity with enolase gene products. W…
The series of dinuclear 4,4′-bis(hexyloxy)azobenzene, [H(Azo-6)], cyclopalladated complexes of general formula [Azo-6)Pd(µ-X)]2, (X = Cl, Br, I, N3, SCN, OAc) and [Azo-6)2Pd2(µ-Ox)] (Ox = oxalate) have been synthesized and investigated for mesomorphism and spectroscopic properties. Single-crystal X-ray analysis of the…
Molecules of azaporphyrins combine two acidic pyrrole-type NH groups and several basic centres—two internal pyrrolenine nitrogen atoms and from one to four meso-nitrogen atoms—in one highly conjugated aromatic system. The acid–base properties of such unique multicentre ampholites have been the subject of numerous stud…
The results of electronic structure calculations of the induced dipoles and quadrupoles on an anion in a locally distorted rocksalt crystal are described. Such information is of interest in the construction of ionic interaction potentials and for modeling the dielectric behavior of ionic materials. The systems include…
We describe an experimental method for in situ resistivity measurements during the electrochemical hydrogen loading of thin, switchable metal hydride films. Using an oxygen‐free electrolyte we are able to measure the hydrogen concentration in the films quantitatively and to determine the pressure‐composition isotherms…