Materials Literature
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We present the results of a specific heat study of the ${\mathrm{Pr}}_{0.6}({\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{)}_{0.4}{\mathrm{MnO}}_{3}(0<~x<~1)$ manganite system as a function of doping concentration x and temperature. The low-temperature specific heat data indicate that these materials have De…
Electrodes of conductive nitrogen‐incorporated tetrahedral amorphous carbon films ( taC : N ) deposited at ambient temperatures are shown to possess an extraordinary combination of the stability associated with boron‐doped diamonds and greatly enhanced electrocatalytic properties. In this first communication on the el…
Diamondlike carbon (DLC) prepared by plasma-enhanced CVD is a metastable amorphous material characterized by attractive optical, electrical, chemical, and tribological properties. DLC films can be prepared at low temperatures from a large variety of precursors, and can be modified by the incorporation of different ele…
Mesoporous molecular sieve silicas with ordered structures are formed from tetraethylorthosilicate (I0) in a new reaction pathway based on nonionic R(EO)nH surfactants (N0) and denoted (N0Mn+)I0, wherein electrostatic forces are introduced into the assembly process through –(EO)nH complexation of small metal cations (…
The ability to predict or confirm ferroresonance and to evaluate its severity depends primarily on the correctness of the transformer model used in the computer simulation. An equivalent circuit is developed here for the widely used three-phase grounded-wye to grounded-wye five-legged wound-core distribution transform…
CdTe nanocrystal/polyaniline composite films as well as films of closely packed CdTe nanocrystals were used to fabricate light-emitting devices with low turn-on voltages [∽2.5 V for a device with a Mg cathode and an indium tin oxide (ITO) anode]. In principle, the emitted colour is tunable from green to red, depending…
Owing to their topology, three iminosemiquinone radical ligands couple in a ferromagnetic fashion, mediated by a low-spin Co(III) ion.
Corona discharge introduces polar groups into the polymeric surfaces and, as a consequence, improves the surface energy, wettability, and adhesion characteristics. The main chemical mechanism of corona treatment is oxidation. This article further discusses some special problems that are related to corona treatment of…
Several alloy systems can be selected for high-temperature shape memory alloys, defined as alloys with stable reverse transformation temperatures above 120°C. However, due to the lack of minimum quality standards for stability, ductility, functional behavior and reliability, no successful applications have been realiz…
In this article, we have developed models for threading dislocation (TD) reduction due to the introduction of an intentionally strained layer. Three different types of dislocations have been considered in this model: misfit dislocations (MDs), mobile TDs, and TDs whose glide motion has been blocked by a MD crossing th…
The goal of this feature article is to introduce the dimension ‘magnetic anisotropy’ in the field of molecule-based magnets. For that, we have focused on three cyano-bridged MnIIMoIII compounds synthesized from the [MoIII(CN)7]4– precursor. The pentagonal bipyramid structure of this precursor is not compatible with a…
Micelle templating and co-condensation of tetraethoxysilane and 3-(2,4-dinitrophenylamino)propyl-triethoxysilane in the presence of hexadecyltrimethyl-ammonium bromide has been used to synthesize transparent yellow thin films and monoliths of organic dye-functionalized MCM-41 silica: these hierarchical materials consi…
The optical effect upon insertion of hydrogen into Pd-coated magnesium lanthanide switchable mirrors is investigated in terms of the changes of their complex refractive indices. A significant change in the optical constants of LnMg layers is seen between the as-deposited state and the dehydrided state after one cycle.…
Broad-band dielectric spectroscopy is employed to study the molecular dynamics of (dielectrically active) glass-forming liquids which are confined to (dielectrically inactive) zeolites and nanoporous glasses. For the H-bond-forming liquid ethylene glycol (EG) embedded in zeolites of different sizes and topologies one…
A new oxidation catalyst containing perruthenate immobilised within MCM-41 has been prepared and used in the clean oxidation of alcohols to carbonyl compounds with molecular oxygen.
Materials containing highly accessible and well ordered titanium sites prepared by grafting titanocene on ITQ-2 material are excellent catalysts for epoxidation of olefins, yielding high conversions and selectivities to the desired epoxides.
Reactions of [H2N(CH2)3]8Si8O12 or its octahydrochloride salt with a variety of electrophiles, including anhydrides, lactones, acid chlorides, α,β-unsaturated esters and isocyanates, afforded functionalized R8Si8O12 frameworks in good to excellent yields. Practical methods for the synthesis of [HO(CH2)3]8Si8O12, [OCN(…
Nanocrystalline SrTiO 3 was prepared by a stearic acid sol-gel technique. X-ray measurements showed that the sample obtained is of good quality and the grain sizes range from 26 to 120 nm. One blue photoluminescence (PL) band at around 470 nm was observed at room temperature. Investigation of the dependence of the vis…
A quantitative thermal conductivity measurement technique, the method, is applied in a scanning thermal microscope (SThM) with a resistive probe for the determination of thermal properties with a high spatial resolution in the nanometre range. With this set-up the quantitative thermal conductivity of materials can be…
Thermal and mechanical behavior of ZnO varistors used in surge arresters is simulated for current pulses of various magnitude and duration. Time dependence of the temperature profile and of the distribution of thermal stresses is computed by solving heat transfer equations for varistor disks with nonuniform electrical…