Materials Literature
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We have investigated magnetic field-induced strain (MFIS) associated with rearrangement of martensite variants and its corresponding magnetization process in a disordered Fe-31.2Pd(at%) single crystal and an ordered Fe3Pt single crystal, exhibiting a cubic to tetragonal martensitic transformation at 230 K and 85 K, re…
Heating single-walled carbon nanotubes (SWNTs) with molten hydroxides MOH (M = K, Cs) gave MOH@SWNT in good yield; high resolution transmission electron microscopy (HRTEM) indicated that CsOH in CsOH@SWNT often adopts twisted 1D crystal structures inside SWNTs; treating MOH@SWNT with water at room temperature removes…
The influence of cathode composition on the open-circuit voltage (OCV) and the performance of a single chamber solid oxide fuel cell (SC-SOFC) was investigated. Because the SC-SOFC is operated using a mixture of air and fuel, the OCV of the cell is determined by the difference of catalytic activity between the cathode…
Endosmart GmbH was founded in January 2002 and is a spin-off from the Forschungszentrum Karlsruhe. Endosmart focuses on the use of NiTi mostly outside the implant market. Therefore a lot of tools especially for instruments for minimally invasive surgery are being developed. Innovative hingeless graspers, baskets, flex…
Successful synthesis of a series of highly conjugated porphyrin analogues, including thia-, dithia- and oxathia-tetrabenzoporphyrins, and their optical properties are reported.
We have refined a one-pot synthesis of trans-A2B-corroles via the condensation of 5-(pentafluorophenyl)dipyrromethane with aldehydes followed by macrocyclization mediated by DDQ. After thorough examination of reaction parameters and thanks to the identification of key factors influencing the formation of bilanes and t…
[Fe(tpy-DTTA)(2)Gd(2)] is a self-assembled trinuclear complex based on a novel ligand in which a terpyridine and a poly(amino carboxylate) moiety are connected; it has a well-defined topology with favourable features to attain high relaxivities, i.e. a rigid Fe(II)(tpy)(2) core, reduced flexibility at the periphery th…
Surface dissolution and diffusion of oxygen molecules (O2) in SiO2 glass were studied by their photoluminescence at 1272 nm excited with a titanium sapphire laser oscillating at 765 nm. The dissolution of O2 from ambient atmosphere at both surfaces was much faster than the following diffusion of O2 into SiO2 glass, in…
A new type of hierarchically three-length-scaled porous zirconium oxide material with high BET surface area of > 900 m2 g−1, having a uniform macroporous (300–500 nm) structure of a supermicroporous (1.5 nm) nanoparticle (∼25 nm in size) assembly with irregular mesovoids (20–60 nm) in the macroporous walls, was prepar…
This communication presents the crystal structures of the high spin state at 300 K, the low spin state at 30 K and the metastable high spin state after irradiation at 30 K and an estimate of the critical LIESST temperature of [FeL2](BF4)2 which is shown to undergo a spin transition at 271 K.
The influence of hydroxyl group (OH) concentration on the durability of adhesive bonds formed between an epoxy resin and aluminium adherend has been examined. Initially, surface analysis in combination with chemical derivatisation was employed to characterise the OH and epoxy functional groups present in FM-73, a stru…
The highly deformed, micrograined layer on the outermost surface of a rolled Al-Fe-Si-Mn model alloy was electrochemically characterized. The thickness of this deformed surface layer in a 1.0 mm thick sheet was approximately 1 μm. Polarization curves in 5% NaCl solution at pH 3.0 and 11.5 were obtained at different de…
Anodic polarization was performed in 0.9% NaCl and 1% lactic acid solutions to characterize the relationship between the corrosion behavior and microstructures of cast Ti-Au (5-40%) alloys. An abrupt increase in the current density occurred at approximately 0.6 V vs. SCE for the 30% and 40% Au alloys in the 0.9% NaCl…
The enhanced gradient plasticity theories formulate a constitutive framework on the continuum level that is used to bridge the gap between the micromechanical plasticity and the classical continuum plasticity. The later cannot predict the size effects since it does not posses an intrinsic length scale. To assess the s…
Electrochemical and spectroscopic measurements with CV, chronoamperometry and in situ spectrometry were carried out for dimethyl terephthalate, which showed vivid color change upon electrochemical stimulation, to clarify its electrochromic characteristics.
DNA adsorption onto polypyrrole (PPy) powder particles has been monitored, ex situ , by X‐ray photoelectron spectroscopy (XPS) technique. DNA adsorption isotherms were determined by the quantitative analysis of the XPS spectra, and by plotting the X/N atomic ratios (X = C, O, Cl, P and Na) versus DNA equilibrium conce…
The formation of a new trigonal polytype of niobium disulfide, 1T-NbS2, is described from the atmospheric pressure chemical vapour deposition reaction of niobium pentachloride with hexamethyldisilathiane and tert-butyl disulfide at 400–600 °C; films were grown on glass and those deposited at 500–600 °C were crystallin…
We introduce a degenerate nonlinear parabolic system that describes the chemical aggression of calcium carbonate stones under the attack of sulphur dioxide. For this system, we present some finite element and finite difference schemes to approximate its solutions. Numerical stability is given under suitable CFL condit…
A multi-component white cast iron was developed for rolling mill rolls. The morphology and alloy concentration of carbides precipitated during solidification were investigated using X-ray diffraction, SEM, TEM and EDS analysis in the cast iron with typical chemical composition of Fe-2%C-5%Cr-5%V-5%Mo-5%W-5%Co (mass%).…
Formation of pitting at copper-contaminated sites on the silicon wafer surface during immersion in dilute hydrofluoric acid solution is elucidated by atomic force microscopy observations and electrochemical methods. It was discovered that the pit formation was promoted by the absence of light and hindered under illumi…