Materials Literature
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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…
Abstract A new mode of association of water molecules is described. Adamantanoid water clusters bonded to bromide ions as well as other water molecules form a cage within which bromide‐encapsulated aza cryptands reside to form a host‐within‐a‐host‐like structure. The structure of this adamantanoid water decamer is rem…
Benzylmethoxybis(2,4,6-triisopropylphenyl)tin (1) and benzylisopropoxybis(2,4,6-triisopropylphenyl)tin (2) were synthesized and characterized. Compound 1 exhibited good activity in the ring-opening polymerization of ε-caprolactone, in a living fashion, under mild conditions. The polymerization was demonstrated to proc…
Samples of carboxy methyl cellulose, subjected to ion exchange with different metal ions (Cu, Ni, Co, Fe, and Ca), were pyrolyzed in the temperature range of 300−1000 °C to obtain chars that were doped with metal species. X-ray diffraction (XRD) profiles of these chars showed that the metal species in the char existed…
We demonstrate that in random-stacking hard-sphere colloidal crystals the stacking disorder not only exists in the direction perpendicular to the close-packed layers, but also extends in the lateral direction. The existence of such in-plane stacking disorder is suggested by a recent observation of lateral broadening o…
The preparation of binary materials based on Ta 2 O 5 −ZrO 2 by a sol−gel method and with a wide range of compositions is reported (Ta 2 O 5 nominal content from 4 to 74% w/w). Materials were characterized by X-ray diffraction, and infrared and Raman spectroscopy. Their acidic characteristics were evaluated from the m…