Materials Literature
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Melamine-based quasi carbon nitride with an orthorhombic layer structure and a molecular weight of more than m/z 5000 was prepared with a system of melamine–Lewis acid at 600–700 °C in an autoclave avoiding catalytic carbonation action by ferrous substances.
A new structural type of sandwich polyoxometalate has been synthesized and characterized. The X-ray structure of this diiron complex, [FeIII2(NaOH2)2(P2W15O56)2], reveals that the junction between the central unit (Fe2Na2) and the trivacant POM units is rotated 60° from that observed in all other known sandwich POMs o…
The present paper deals with the analysis of experimental data from conductivity relaxation experiments. It is shown that evaluation of the chemical diffusion and surface transfer coefficients for oxygen by use of this technique is possible only if accurate data for the conductivity transient can be measured at short…
The complex [Fe(L1H)2][BF4]2 exhibits an abrupt thermal spin-crossover which may be mediated by an order–disorder transition of the BF4− anions.
This title provides the latest information on nuclear physics. Based on a course entitled Applications of Nuclear Physics. Written from an experimental point of view this text is broadly divided into two parts, firstly a general introduction to Nuclear Physics and secondly its applications.* Includes chapters on pract…
Hollow polymer cylinders in a polystyrene glass (see Figure) formed by self organization of hydrogen-bonded supramolecules are reported. Part of the supramolecular template can be conveniently removed after the structure has been formed allowing the tubes to be emptied without need for degradation or similar methods.
In order to establish a method for monitoring contamination in insulators based on leakage current waveforms and their frequency characteristics, the leakage current waveforms and frequency characteristics of an artificially polluted 180 mm diameter cap and pin type insulator were investigated by the wet contaminant a…
The temperature coefficient of the resonant frequency (TCF) of complex perovskite (Pb 1− x Ca x )[Fe 0.5 (Nb 1− y Ta y ) 0.5 ]O 3 ceramics ( x = 0.5, 0.55; 0.0 ≤ y ≤ 1.0) was investigated, relative to the bond valence of the A‐ and B‐site ions in the ABO 3 perovskite structure (such as the barium‐, strontium‐, and cal…
A series of composite inorganic–organic materials from the copper/cyanide/organoimine system have been isolated and structurally characterized. The structural consequences of introducing sterically demanding substituents and of expanding the donor to donor distance in linear dipodal organodiimine ligands has been addr…
In the past the role of tungsten as a fusion reactor plasma-facing material has been fairly limited. It has appeared sparingly in tokamaks, but usually only for experimental purposes. This is likely to change in the future. Tungsten has a very high threshold for sputtering as well as a high melting point and high ther…
We have used detergent and enzymatic extraction of natural arteries to produce an acellular matrix vascular prosthesis (AMVP). Implanted as an allograft in a canine model, this AMVP shows excellent handling characteristics, low thromboreactivity, no evidence of aneurysm, and exceptional graft patency in the peripheral…
Polycondensation/pyrolysis of 2,5,8-tricarbodiimide-tris-s-triazine and its derivatives gave hexagonal graphite-like pseudo carbon nitrides, CH0.3–0.08N1.0–0.63, composed of tris-s-triazine nuclei. The materials were stable up to 600–800 °C under an inert atmosphere depending on their nitrogen content.
Adhesive wettability of wood is usually evaluated by contact angle measurement. Because of liquid penetration and spreading on the wood surface, the contact angle changes as a function of time. In this study, a wetting model was developed to describe the dynamic contact angle process in which a parameter (K) can be us…
La[N(SiMe3)2]3 reacted with 1,3-dicyclohexylcarbodiimide in refluxing toluene to yield the mono-guanidinate complex La[CyNC(N(SiMe3)2)NCy](N(SiMe3)2)21. Compound 1 is monomeric in solution; X-ray structural analysis reveals an unassociated complex in the solid state, with a four-coordinate lanthanum center. Complex 1…
Silk fibroin solution was prepared by dissolving the silk fibroin in triad solvent CaCl2 · CH3CH2OH · H2O. In this article we tested and analyzed the state of frozen silk fibroin solution and fine structure of freeze dried porous silk fibroin materials. The results indicated that the glass transition temperature of fr…
TOPO (tri-n-octylphosphine oxide) capped Mn-doped ZnS and Mn-doped CdS nanoparticles have been prepared from bis(diethyldithiocarbamato)zinc(II) or bis(methylhexyldithiocarbamato)cadmium(II) and manganese dichloride. The nanoparticles obtained all show quantum size effects in their optical spectra with respect to the…
The viability of bacteria in the presence of sol–gel reagents has been studied in order to define the best experimental conditions for the sol–gel encapsulation of E. coli. The β-galactosidase activity of these bacteria, trapped in sol–gel silica matrices, was then analyzed. Two routes, using alkoxide and aqueous prec…
Abstract Inelastic mean free path values are needed for quantitative XPS analysis of a range of important polymers and other organic materials. Measured reference data are limited, although some semi‐empirical equations to estimate IMFP are available. Existing estimation methods often require values for such quantitie…
New kinds of hybrid materials containing covalently bonded Eu3+ (Tb3+) bipyridine complexes in a silica network have been prepared and their luminescence properties reported.
Six novel octakis(dialkoxyphenoxy)phthalocyaninatocopper(II) complexes (abbreviated as [(CnO)2PhO]8PcCu (n = 9–14)) have been synthesized. It was found that these derivatives exhibit rich mesophases; Colh, Colr1, Colr2, Colr3, Coltet and Cub phases. These mesophases were characterized by microscopic observation, DSC m…