Materials Literature
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Abstract A new family of iron( II ) tetrafluoroborate and perchlorate spin‐crossover compounds has been synthesised and is discussed. The iron( II ) ion is surrounded by six 1‐ethyltetrazole ligands, which are halogen‐substituted on the C2 atom of the ethyl group. The spin‐crossover temperatures T 1/2 are high compare…
The effect of samarium substitution on dielectric and ferroelectric properties of BST is studied. Sample with compositional formula [Ba0.95Sr0.05]1− x /2Sm x Ti1− x /2O3, with x varying from 0 to 0.025 in steps of 0.005, were prepared by the conventional dry method. X-ray analysis confirmed the formation of single-pha…
The spin-selective photokinetics of a single matrix-isolated impurity molecule with a triplet-triplet optical transition, T 0–T 1, is considered and the manifestations of the photokinetics in the fluorescence excitation spectra and intensity autocorrelation functions g (2)(τ) of the molecule undergoing narrow-band opt…
Various types of three-dimensional matrices have been used as basic scaffolds in myocardial tissue engineering. Many of those are limited by insufficient mechanical function, availability, or biocompatibility. We present a clinically established collagen scaffold for the development of bioartificial myocardial tissue.…
The biosynthetic pathway for the synthesis of the compatible solute alpha-mannosylglycerate (MG) in the thermophilic bacterium Thermus thermophilus HB27 was identified based on the activities of recombinant mannosyl-3-phosphoglycerate synthase (MPGS) (EC 2.4.1.217) and mannosyl-3-phosphoglycerate phosphatase (MPGP) (E…
Different amounts of silver (0.5–10 wt%) have been mixed with EIA X7R‐type ceramic powders based on barium titanate. The XRD analysis indicated that no phases other than BaTiO 3 and silver were present in the doped ceramics; it further suggested that no reaction took place between BaTiO 3 and silver during calcination…
In this work, a bentonite clay from Mendoza, Argentina was activated with H2SO4 (4 and 8 N) at 90ºC for 2 and 3.5 hours. Under these conditions several cations were removed from the octahedral sheet (Mg, Al, and Fe) and the DTA-TGA curves of the solids obtained after treatment were modified. Treatment time and acid co…
Aluminum nitride (AlN) nanopowder was successfully synthesized from transition alumina nanopowder using an NH 3 –C 3 H 8 gas mixture as a reduction–nitridation agent. Phase‐pure, nanocrystalline AlN powder with a specific surface area of 36.4 m 2 /g and a mean particle size of 51 nm was prepared under typical reaction…
Aiming at the improvement of the photochemical performance of dithienylethenes, we present an analysis of the parameters that influence the quantum yield. We address some basic features of the ground-state potential energy surface of the photochromic dithienylethenes, showing the existence of three to five rotational…
Local fluorescence probes based on CdSe semiconductor nanocrystals were prepared and tested by recording scanning near-field optical microscopy (SNOM) images of calibration samples and fluorescence resonance energy transfer SNOM (FRET SNOM) images of acceptor dye molecules inhomogeneously deposited onto a glass substr…
The effects of formation of cyclodextrin inclusion complexes on the photochemical and photophysical properties of zinc phthalocyanine ( ZnPc ) and various peripherally substituted zinc phthalocyanines as well as zinc naphthalocyanine ( ZnNPc ) are investigated. The cyclodextrins employed were the hydroxypropyl-γ-cyclo…
Various oxide powders were prepared by the emulsion combustion method (ECM) using metal precursors, kerosene, and a surfactant. The product particles were characterized by transmission electron microscopy (TEM), nitrogen adsorption, and X‐ray diffraction. Hollow γ‐Al 2 O 3 particles were produced from aluminum nitrate…
Abstract The first examples of trimeric, dimetallic, pure oxalate‐bridged complexes [ox = (C 2 O 4 ) 2− ] have been synthesized and characterized structurally and magnetically for the two new series of crystalline molecular assemblies formulated as (TTF) 4 {M II (H 2 O) 2 [M III (ox) 3 ] 2 }· n H 2 O [for M III = Cr;…
A novel method is developed to objectively evaluate the frictional feel of textiles. A polymeric artificial human finger sensor fabricated from polyvinylsiloxane material em ulates the feeling mechanism of the fingers. This polymeric sensor is conveniently converted into a friction sledge that can be used to measure t…
Abstract. Crops on sandy soils (<5% clay) are exposed to K deficiency due to the small release and high leaching losses of K. Reliable tools are needed to improve the K management in cropping systems with limited K input, such as organic farming where import of nutrients are restricted according to the EC regulatio…
Carbon nanotubes (CNTs) did not exhibit strong interactions with Biliverdin IX beta reductase enzyme (BVRB) in water. With the use of noncovalent functionalization by the surfactant Triton X-100, the surfaces of the CNTs were changed from hydrophobic to hydrophilic. The hydrophilic surface of the CNT-Triton conjugate…
Titanium is a wonder metal, generally considered as one of the most biocompatible and corrosion resistant metals available for clinical applications. Since 1951, when Leventhal /1/ first published an article on the orthopaedic application of this metal, research activity and clinical experience resulted in new develop…
Abstract The deformation behavior of copper during equal channel angular pressing (ECAP) was calculated using a three-dimensional version of a constitutive model based on the dislocation density evolution. Finite element simulations of the variation of the dislocation density and the dislocation cell size with the num…
To use the unique properties of nanocrystalline ferrites in magneto-optical devices, it is important that they have a narrow particle size distribution. The present paper illustrates the potential of the microemulsion technique to synthesise different nanocrystalline ferrites (nickel ferrites, zinc ferrites) with such…
Abstract Hydrogen storage in MWNT was enhanced via the catalytic activity of NiMgO. The magnitude of the hydrogen to metal ratio for the MWNT/NiMgO system, combined with temperature programmed adsorption and desorption studies, showed hydrogen spillover from the catalyst to the carbon surface. Metal doping combined wi…