Materials Literature
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Confluence of NMR for paramagnetic molecules and the complementary density functional theory calculations reveals an anomalous spin-polarization mechanism that is maximized in high-spin d(4) complexes. It is critical to realize this mechanism to correctly rationalize the spin-density distribution around the porphyrin…
Nanoparticles of MnFe 2 O 4 have been synthesized under an induced magnetic field by a hydrothermal process. A strong correlation between the cation distribution and the magnetic properties of MnFe 2 O 4 nanoparticles has been identified. From the results of Mössbauer spectroscopy it has been found that the nanopartic…
Addition of NaCl to the solid-phase fermentation of an Australian isolate of Gymnoascus reessii resulted in enhanced production of chloropolyenylpyrroles, while the addition of NaBr suppressed chloropolyenylpyrrole production in favor of bromo and dechloro analogues. Access to a wider selection of polyenylpyrroles pro…
The production of hydrogen via the partial oxidation of isooctane was evaluated using a variety of Ni−Al 2 O 3 catalysts . The effects of catalyst preparation method, nickel loading, and calcination temperature, as well as the reaction operating conditions (such as reaction temperature and space velocity), on the perf…
Periodic arrays of Ta nanopillars were grown onto patterned substrates by glancing angle sputter deposition at growth temperatures Ts ranging from 200to900°C. The Si substrates were patterned using a colloidal suspension of 260-nm-diameter silica spheres that was dispersed to form a two-dimensional close-packed monola…
Abstract Combined ultrahigh vacuum‐electrochemical (UHV‐EC) methods were utilized to expose polycrystalline iron and mild steel surfaces to 0.01 M NaOH and for the subsequent transfer back to the UHV analysis chamber without exposure to air. X‐ray photoelectron spectroscopy (XPS) was then employed to elucidate a chemi…
A new numerical method is proposed for determining the low-frequency dynamics of the charge carrier coupled to the deformable quantum lattice. As an example, the polaron band structure is calculated for the one-dimensional Holstein model. The adiabatic limit on the lattice, which cannot be reached by other approaches,…
We systematically studied the magnetic and transport properties of the polycrystalline samples of Fe-doped perovskite cobaltites: ${\mathrm{Pr}}_{1\ensuremath{-}y}{\mathrm{Ca}}_{y}{\mathrm{Co}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$ ($y=0.3$, $x=0--0.15$; $y=0.45$, $x=0--0.3$) and ${\mathrm{Gd}}_{0.55}{\…
Ferroelectric b-axis oriented BaTi2O5 thin film was successfully prepared on MgO (100) substrates by laser ablation. The effects of substrate temperature (Tsub) and oxygen partial pressure (PO2) on the crystal structure, surface morphology, and dielectric property of the film were investigated. BaTi2O5 thin films were…
KOH sub-molten salt method was studied for preparing potassium titanate whiskers and titanium dioxide by using titaniferous slag as the raw material. The effects of reaction temperature, reaction time, initial KOH concentration and mass ratio of alkali-to-slag on the morphology of the products were investigated. The r…
The fracture of Ni-Ti superelastic alloy has been investigated by a sustained tensile-loading test in physiological saline solution containing hydrogen peroxide (0.15M NaCl + 0.3M H(2)O(2)). The fracture always occurs when the applied stress exceeds the critical stress for martensite transformation. In contrast, under…
Eine optische Spritze für den Transport eines Substrats in vivo beruht auf der lichtaktivierbaren 3,5-Dibrom-2,4-dihydroxyzimtsäure-Gruppe. Eine Zweiphotonenanregung setzt das Substrat (hier Ethanol) frei; dabei entsteht ein fluoreszierendes Cumarinderivat, mit dessen Hilfe die Konzentration an freigesetztem Substrat…
The preparation and characterization of several new cyano-ligated six-coordinate low-spin iron(III) porphyrinates are reported. The synthesis and structure of the new bis(cyanide) derivative K(222)][Fe(TMP)(CN)2] (TMP = tetramesitylporphyrinate) is described. Three mixed-ligand species of the general form [Fe(Porph)(C…
TiO 2 is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH 3. Furthermore, it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorption of SO 2 and NO over two kinds of TiO 2 catalysts was investigated using a conventional flow type…
Several trans-azobenzene derivatives carrying a nitroxide (aminoxyl) radical (2a, 6a-12a) were prepared, and their photoisomerization reactions to the corresponding cis-isomers were investigated. Although no fruitful results could be obtained for the photoisomerizations of the derivatives with para-subsituents (9a-12a…
The dynamic structure factor S(Q,omega) of both associated (water and ammonia) and simple fluids (nitrogen and neon) has been determined by high-resolution inelastic x-ray scattering in the 2-14 nm(-1) momentum transfer range. A line-shape analysis with a generalized hydrodynamic model was used to study the involved r…
This study reports the fabrication of bioactive polymer fibers onto which signaling molecules can control and direct cell responses. To encourage and control directional biological responses, GRGDS peptides were immobilized onto the surface of 100 microm diameter poly(ethylene terephtalate) (PET) fibers (monofilaments…
Magnetoelectric composites with ferrite–ferroelectric composition ( x )Ni 0.8 Zn 0.2 Fe 2 O 4 +(1− x ) PZT (lead zirconate titanate (PbZr 0.52 Ti 0.48 O 3 ) used as a ferroelectric phase) in which x varies as 0, 0.15, 0.30, 0.45 and 1 mol% were prepared by using a conventional ceramic double-sintering method. Phase an…
The structure of oriented 2D block copolymer single crystals is characterized by grazing-incidence small-angle x-ray diffraction, demonstrating long-range sixfold orientational order. From line shape analysis of the higher-order Bragg diffraction peaks, we determine that translational order decays algebraically with a…
We have analyzed the fine structure of the distribution of relaxation times obtained from dynamic light scattering on solutions of homopolymers and diblock copolymers. We have shown that in a carefully designed experiment two additional fast modes can be identified in the distribution of relaxation times, besides the…