Materials Literature
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Zr-2.5Nb alloy pressure tubes for CANDU® reactors are nominally extruded at 815°C, cold-worked about 27%, and stress-relieved at 400°C for 24 h. The resulting structure consists of elongated α-Zr grains interspersed with a network of thin β-Zr filaments. Corrosion tests on unirradiated and preirradiated material have…
Our aim in this article is to discuss some questions related to the existence and uniqueness of solutions and on the existence of finite dimensional attractors for Cahn–Hilliard type equations. Compared to the classical Cahn–Hilliard equation, these models take into account the anisotropy of the material, the work of…
For clarification of the grain boundary energy and its structure of α-<110> symmetric tilt boundaries, the atomic structure was obtained by molecular dynamic method. The obtained results are summarized as follows.The grain boundary energy of <110> symmetric tilt boundary strongly depends on misorientation angle. There…
To prepare spray-dried powders of poly(D,L-lactic acid) (PLA) or poly-epsilon-caprolactone (P epsilonC) from colloidal suspensions containing indomethacin (IND) using benzyl benzoate (BnB), nanocapsules (NC) were prepared by nanoprecipitation. To select the best NC formulations, increasing drug concentrations were tes…
The utilization of sucrose by Clostridium acetobutylicum ATCC 824 was investigated. Sucrose was found to be transported via a phosphoenol-pyruvate (PEP)-dependent phosphotransferase system (PTS) and a metabolic pathway identical to that previously identified in C. beijerinckii, was established. The genes encoding the…
We studied the effects of different substrates on the development of the morphologies in thin film polymer blends in as-spun and annealed films. We have utilized thin films of blends of polystyrene and poly(methyl methacrylate) spun cast on Si, Au and Co surfaces, and produced quantitative composition maps with near e…
Amphiphilic and fluorescent covalently labelled core-shell nanoparticles based on poly(methyl methacrylate) (PMMA), were prepared by random copolymerisation of N-Vinyl carbazole (NVC) with MMA, initiated on polysaccharidic radicals, yielding diblock copolymers of either dextran-P(MMA-NVC) (Nanodex* particles), or hepa…
The synthesis and crystal structure of decanuclear Co and nonanuclear Ni cages are reported: the cages feature carboxylate and pyridonate ligands and demonstrate that inter-ligand repulsions can lead to novel structures.
Thermally induced structural transformations in hydrated MoO3 prepared by acidification of Na2MoO4 solution have been investigated dynamically by thermo-Raman spectroscopic techniques. The thermo-Raman spectra reveal that the structural evolution of as-synthesized hydrated MoO3 in air proceeds through an amorphous pha…
The phase–field model for binary alloys by Kim et al. is briefly introduced and the main difference in the definition of free energy density in interface region between the models by Kim et al. and by Wheeler et al. is di cussed. The governing equations for a dilute binary alloy are derived and the phase-field paramet…
Nucleation events of pitting corrosion for Fe‐Cr and Fe‐Cr‐Mo alloy series, enabling a single‐parameter variation in the alloy composition, was studied with microelectrochemistry. The main effect of Cr and Mo additions in Fe‐Cr alloys on the microtransient activity in NaCl solution is a decrease of the transient heigh…
Phenolic Schiff bases derived from o-, m-, and p-hydroxybenzaldehydes and 4, 4′-diaminodiphenyl ether were subjected to polycondensation reaction with formaldehyde. The resins were found to form polychelates readily with several metal ions. The materials were characterized by elemental analysis, GPC, IR, UV-Vis, 1H-NM…
Beta-titanium alloys show an excellent capability for precipitation hardening. The microstructural evolution i.e. the nature, the morphology, and the degree of coherency of the phases formed during the transformations of the beta phase strongly determines the characteristics of the alloys. It is known that ω precipita…
A novel phosphorus-containing curing agent, 2-(6-oxid-6H-dibenz〈c,e〉〈1,2〉oxa-phosphorin-6-yl) phenol formaldehyde novolac [OD-PN], was prepared from phenol formaldehyde novolac resin (PN) and a reactive 2-(6-oxid-6H-dibenz〈c,e〉〈1,2〉oxa-phosphorin-6-yl)chloride (ODC) while ODC was synthesized through reaction between o…
Because the performance of power transformers is by various distinct parameters of the magnetic core, the prediction of relevant characteristics such as no-load losses P by analytical methods is impractical. This paper reports first attempts to predict the dependence of P on several parameters of core design by means…
Eight new compounds α- and β-MxHy[(CpTi)3XW9O37]·nH2O (M = K+, x = 4, y = 3; M = NBu4+, x = 7, y = 0; X = Si, Ge) have been synthesized from vacant heteropolytungstate precursors α-, β-[XW9O34]10− (X = Si, Ge) and Cp2TiCl2. The products were characterized by elemental analysis, IR, UV–VIS spectroscopy, 1H NMR, 183W NM…
The crystal structures of [Ph4P]2[M(mnt)2] (M = Zn 1, Cu 2 or Ni 3), [Ph4P][M(mnt)2] (M = Cu 4 or Ni 5), [Ph4P]2[{M(mnt)2}2] (M = Co 6 or Fe 7), [Ph4P]2[M(mnt)3] (M = Fe 8 or Cr 10) and [Ph4P]3[Cr(mnt)3] 9 {mnt = maleonitriledithiolate, [S2C2(CN)2]2−} have been determined to investigate the packing and supramolecular…
The polymerization of aldehydes has played a considerable role in the progress of chain reaction polymerization and has significantly contributed to our knowledge of polymer science. Polyformaldehyde, as homopolymer and copolymer, plays an important role as a significant niche product in engineering plastics use. High…
The first structural characterisation of a heterocyclic free radical in all phases has been achieved. 4,5-Bis(trifluoromethyl)-1,3,2-dithiazol-2-yl, [CF3CSNSCCF3]˙ 4d, a 7π radical, was prepared quantitatively on reduction of [4d][AsF6] with various reducing agents. It is a blue gas over a green paramagnetic liquid [1…
Voltage-modulated scanning force microscopy has been employed to investigate the dynamics of ferroelectric domains as a function of time and temperature in triglycine sulfate (TGS) single crystals. Branching of the domain structure and nucleation of fine domain patterns by internal fields of thermal origin have been d…