Materials Literature
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The synthesis and polymerization of two new electroactive bisphenols derived from 3,4,9,10-perylenetetracarboxylic dianhydride and 1,4,5,8-naphthalenetetracarboxylic dianhydride with 2-(4-aminophenyl)-2-(4-hydroxyphenyl)propane, respectively, are described. Copolymerization using the two new bisphenols and 4,4′-isopro…
Silver colored ribbon-like crystals of K1 − xSn5 − xBi11 + xSe22 (x ≈ 0.33) were prepared by direct combination of K2Se, Bi2Se3, Sn and Se at 800 °C. A structure determination was carried out for K0.66Sn4.82Bi11.18Se22. Bi2Te3-type and NaCl-type building units are connected to form a new kind of three-dimensional anio…
Reaction of VCl4 or VOCl3 with water under atmospheric pressure chemical vapour deposition conditions in a cold-wall horizontal-bed reactor at 350–600 °C produces clear yellow V2O5 films. Films grown at temperatures in excess of 500 °C were crystalline and indexed with an orthorhombic unit cell a = 11.527(5), b = 4.38…
A family of pyrochlore stannates, M2Sn2O7 (M = La, Bi, Gd or Y) has been prepared from hydrothermal systems at 240 °C and structurally characterized by powder X-ray diffraction, transmission electron microscopy and differential thermal analysis. The La and Bi stannates showed nanocrystalline characteristics with avera…
Treatment of zerovalent copper with NH4X (X = I, Br or SCN) in the presence of RbI and 18-crown-6 (18c6), in acetonitrile, in air, afforded a diversity of crystalline products in which halogeno- or pseudo-halogeno-cuprate(I) anions co-precipitate with the geometrically rigid crown ether cation [Rb(18c6)]+. Four comple…
Low-rate dynamic contact angles of a large number of liquids were measured on a poly(ethyl methacrylate) (PEMA) polymer using an automated axisymmetric drop shape analysis profile (ADSA-P). The results suggested that not all experimental contact angles can be used for the interpretation in terms of solid surface tensi…
The isomeric diamine monomer 5(6)-amino-1-(4-aminophenyl)-1,3,3-trimethylindane (DAPI) was successfully synthesized via the dimerization of α-methylstyrene followed by nitration and reduction. High molecular weight, soluble polyimides were synthesized via ester–acid solution imidization techniques and had glass-transi…
The presented studies are focused on the dependence of paper sheet strength properties such as tear resistance, burst, and extensibility on the composition of additive [chitosan blends with poly(vinyl alcohol) and gelated starch]. Chitosan acetate (cationic) and its blends caused an improvement of the strength propert…
Ten different ceramic matrix composite (CMC) materials were subjected to a constant load and temperature in an air environment. Tests conducted under these conditions are often referred to as stressed oxidation or creep rupture tests. The stressed oxidation tests were conducted at a temperature of 1454°C at stresses o…
The kinetics of waterside corrosion of Zircaloy-4 in PWR systems reveal accelerated reaction rates at high burnup levels. In such cases, a thick and dense hydride layer is observed beneath the metal/oxide interface. Laboratory corrosion tests on samples prehydrided using gaseous and cathodic charging techniques clearl…
Novel unsymmetrical squarylium dyes which absorb in the near-infrared region were synthesized by a stepwise procedure via intermediate 4-substituted 3-hydroxycyclobut-3-ene-1,2-diones. By introducing benz[c,d]indoline or benzo[b]pyran moieties at one end as an electron-donating component, the SQ dyes exhibited their a…
A measuring system for the digital acquisition of partial discharge (PD) pulse signals, based on the last generation of oscilloscopes, has been developed in order to perform both PD pulse shape and PD pulse height analysis. Wide-band, fast sampling rate and individually-triggerable memory blocks are available for the…
A new macrocyclic ligand 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraylmethyltrimethylenetris(phenylphosphinic acid) H3L1 was synthesised and its complexes with lanthanides were prepared. X-Ray analysis of seven Ln complexes (Ln = La, Ce, Nd, Eu, Tb, Er, Yb) shows a formation of dimers [LnL1]2 with phosphinic acid br…
An investigation was carried out on the crystallization behavior of p-dioxanone polymers using differential scanning calorimetry (DSC). Kinetic analyses were performed on data collected primarily during isothermal crystallization. Isothermal data were treated within the framework of the classical Avrami equation. Usin…
The effect of glass fibers on the crystallization of poly(butylene terephthalate) (PBT) was investigated by crystallization kinetics analysis under isothermal and nonisothermal conditions. From the crosspolar optical micrographs of melt- and solvent-crystallized PBT composites, the glass fibers were found to increase…
Medical technology continues to advance rapidly, as physicians and engineers move closer and understand better each other's needs. Nowhere is there more evidence for this than in the development of advanced medical implants. Traditionally, new products were developed by prototyping and evaluation; however, this proces…
Microwave effects have been shown to promote the activation of NOx molecules in the process of selective reduction of NO by CH4 over an In–Fe2O3/HZSM-5 catalyst and to enhance the water tolerance of this catalyst for NO reduction.
The optical properties and quantum efficiency of potential red K 5 Eu x ( WO 4 ) 2.5 + 1.5 x ( x = 0.5 − 3.0 ) phosphors for a novel phosphor liquid crystal display (LCD) are measured under near‐UV excitation (394 nm). The quantum efficiency of K 5 Eu 2.0 ( WO 4 ) 5.5 phosphor fired at 900°C for 3 h is 0.46 at 365 nm…
A series of cationic porphyrins with 1-4 positive charges are studied: mono(N-methyl-4-pyridyl)triphenylporphine chloride [Mono], cis(N-methyl-4-pyridyl)diphenylporphine chloride [Cis], tri(N-methyl-4-pyridyl)monophenylporphine chloride [Tri] and tetra(N-methyl-4-pyridyl)porphine chloride [Tetra]. Their photophysical…
A series of N-substituted, thermally stable, photochromic fluorescing indol-2-ylfulgimides were synthesized, with high yields, from the corresponding fulgides by Lewis acid and hexamethyldisilazane promoted one-pot reaction. The quantum efficiencies of the photoinduced coloration and bleaching processes, in polar and…