Materials Literature
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Dense (K,Na)NbO 3 (KNN)-based ceramics were developed by optimizing the sintering conditions with newly developed K 4 CuNb 8 O 23 (KCN) as a sintering aid. The sinterability and electrical properties of KNN ceramics were investigated as a function of KCN concentration. The density of KNN ceramics increased monotonical…
We present a comprehensive analysis of double-resonant Raman scattering in graphite and derive an analytical expression for the Raman cross section of the $D$ mode in one dimension. The extension to two dimensions does not change the double-resonant phonon wave vectors. In the full integration of the Raman cross secti…
A method for accelerating the discovery of ionic luminophores using combinatorial techniques is reported. The photophysical properties of the resulting transition-metal-based chromophores were compared against a series of analogous, traditionally prepared species. The strong overlap between these two sets confirms the…
The investigations of the structure of polypropylene fibers colored with quinacridone and phthalocyanine pigments were carried out. The fibers were extruded from the melt at three different temperatures and were taken at three different velocities. In fibers two polypropylene modifications, the monoclinic α and the tr…
Abstract Investigation of the surface composition of powders often requires compaction. To study the effect of compaction on surface analysis, samples have been compacted at various pressures ranging from 0 Pa (i.e. no compaction) up to 2000 MPa (2 × 10 4 kg cm −2 ) Low‐energy ion scattering (LEIS) was used to determi…
We have theoretically investigated a series of butadiyne-linked porphyrin derivatives that exhibit large two-photon absorption (TPA) cross sections in the visible-IR range. The electronic structure, one-photon absorption (OPA), and TPA properties have been studied in detail. We found that the introduction of a butadiy…
Abstract The preparation and ligating properties of S‐oxygenated derivatives of a macrobinucleating hexaazadithiophenolate macrocycle H 2 L 1 of the Robson type towards nickel( II ) and zinc( II ) ions are reported. Nickel complexes of the hexaazadiphenylsulfonate ligand (L 2 ) 2− [(L 2 )Ni II 2 (μ‐L)] + (L = m ‐Cl‐OB…
Abstract Four new Cu II complexes of formulae [Cu 3 (SE) 2 (H 2 O) 2 Cl 3 ]Cl·6H 2 O ( 1 ), Cu 3 (SE) 2 (N 3 ) 4 (DMF) 2 ( 2 ) , Cu(SE)N 3 ·DMF ( 3 ) and Cu(SE)N 3 ·Cu(SE)N 3 ( 4 ) with tridentate Schiff‐base ligands SE − , derived from condensation of N , N ‐dimethylethylenediamine with salicylaldehyde, have been syn…
A solution surface-erosion route was successfully employed to produce one-dimensional (1D) ZnO nanostructures. ZnO nanorod arrays and three-dimensional urchin-like assemblies could be selectively obtained with different manipulations. In this process, zinc foil was introduced to an organic solution system and acted bo…
Abstract The addition of a small amount of a poor solvent impurity (methanol) to a theta solvent (cyclohexane) is found to cause appreciable swelling (≈30% increase of the average brush height) in a model end‐grafted polystyrene (PS) brush layer. This unusual type of swelling is not observed if octadecyltrichlorosilan…
[Co(III)Cp(2)](+)[Fe(III)I(4)](-) (Cp = cyclopentadienyl) prepared by the double oxidation of FeI(2) and CoCp(2) with iodine exhibits a 30 degrees C thermal hysteresis in magnetic susceptibility between 134 and 164 K that is attributed to a phase transition to a disordered triclinic unit cell from an ordered monoclini…
Abstract The photodegradation of poly(ether sulphone) (PES) was investigated systematically by time‐of‐flight SIMS (ToF‐SIMS) and x‐ray photoelectron spectroscopy (XPS). The effect of varying the irradiation dose, wavelength and the atmosphere was studied along with mechanistic photooxidation studies using 18 O 2 . Ph…
Coverage-dependent heats of adsorption and sticking probabilities for oxygen on Ni[211] have been measured at 300 K using single-crystal adsorption calorimetry. The data are consistent with a switch from dissociative chemisorption at low coverage to oxide formation above 2 ML adatom coverage. The initial heat of adsor…
Abstract An extensive study of the surface chemical changes to poly(ether sulphone) (PES) ultrafiltration membranes is made for the first time by the use of time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) after photoirradiation at 254 nm with irradiances varying from 10 to 300 mJ cm −2 in a nitrogen atmosphe…
Using the Glew−Hildebrand saturation technique, the solubilities of bis(2,2,6,6-tetramethyl-4-piperidinyl) maleate in hexane, heptane, octane, m -xylene, and tetrahydrofuran at temperatures from 253.15 K to 310.15 K were measured with the help of the classical equilibrium method. The experimental data were correlated…
Propagation of electromagnetic plane waves in some directions in gravitationally affected vacuum over limited ranges of spacetime can be such that the phase velocity vector casts a negative projection on the time-averaged Poynting vector. This conclusion suggests, inter alia , gravitationally assisted negative refract…
The thermoelectric power $S(T)$ and thermal conductivity $\ensuremath{\kappa}(T)$ were systematically studied for a series of ${\mathrm{Al}}_{82.6\ensuremath{-}x}{\mathrm{Re}}_{17.4}{\mathrm{Si}}_{x}$ $(7\ensuremath{\leqslant}x\ensuremath{\leqslant}12)$ $1∕1$-cubic approximants. We found that $S(T)$ of these approxima…
The Ru2+ complex [Ru(bpy)2(bpy-ph4-Si(CH3)3)]2+ can be electrostatically bound to the negatively charged channel entrances of dye-loaded zeolite L crystals where it acts as a functional stopcock molecule. Impressive electronic triplet-singlet excitation energy transfer from the Ru2+ complex to the acceptor dye oxazine…
We have investigated the charge ordering (CO) in magnetite below the Verwey transition. A new set of half-integer and mixed-integer superlattice reflections of the low-temperature phase have been studied by x-ray resonant scattering. None of these reflections show features characteristic of CO. We demonstrate the abse…
A new Brønsted acidic aluminosilicate, AlTUD-1, with ideal characteristics for catalyst immobilisation (mesoporous structure, high surface area, and high Al(tetrahedral)/Si ratio), was used successfully for the noncovalent anchoring of two well-established asymmetric hydrogenation catalysts: [Rh(I)(cod)[(R,R)-MeDuPHOS…