Materials Literature
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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…
Crystalline undoped and thulium doped yttrium oxide (Y2O3) thin films have been grown by the pulsed laser deposition (PLD) technique on various single-crystal substrates heated at 700 °C. X-Ray diffraction (XRD) analysis showed that the orientations of the films depended on the substrate and on the oxygen pressure. Th…
Modification of poly(phthalazinone ether sulfone ketone) (PPESK) by sulfonation with concentrated or fuming sulfuric acid as sulfonation agents was carried out to prepare membrane materials with increased hydrophilicity and potentially increased fouling resistance. Sulfonated PPESK (SPPESK) copolymers, with a degree o…
In order to raise the turbine inlet gas temperature to improve thermal efficiency of gas turbines, turbine blade and vane materials are required to have high creep rupture strengths. In the present study, a new single crystal superalloy with a moderate Re addition (2.4wt%) has been developed. The alloy shows a higher…
Adamantyl-terminated poly(propylene imine) dendrimers 1–5 were dissolved in water in the presence of β-cyclodextrin through strong non-covalent interaction between the β-cyclodextrin and adamantyl groups. The solubilization of the dendrimer by β-cyclodextrin is most effective at pH = 2, because at this pH there is com…
Poly(amic acid) was synthesized with a low-temperature solution polymerization of 3,3′-dihydroxybenzidine and pyromellitic dianhydride in N,N-dimethylacetamide. The cast films were thermally treated at various temperatures. The polyimide containing the hydroxyl group was rearranged by decarboxylation, resulting in a f…
Optically isotropic thin films (0.5 μm) of an amorphous side-chain copolymer containing 10% azobenzene moieties and 90% meso-azobenzene groups (K1-10 sample) were irradiated by two interfering orthogonal (±45°) or parallel (p + p) linearly polarized laser beams; permanent holographic diffraction gratings were thus ins…
The hydrothermal chemistry of the Ni(II)/molybdate/3,3′-bipyridine system exhibits pronounced pH dependence, such that under basic conditions a 2-D material with embedded clusters [{Ni(3,3′-bpy)2}2Mo4O14] 1 is observed, while under acidic conditions the 2-D bimetallic oxide network of [Ni(3,3′-Hbpy)Mo4O13(OH)] 2 is is…
Many concrete structures may be submitted to high rate dynamic loadings (impacts, explosions, etc.). So, it is necessary to know the behaviour of this material in order to predict the response of the structure. Under dynamic loading an increase of apparent compressive strength is observed. This may be due to a rheolog…
Polyimide (PI) materials with a low coefficient of thermal expansion (CTE) while still retaining high strength and toughness are desirable in various applications. In this study a sol–gel process was used to incorporate silica into homopolyimides and copolyimides with highly rigid structures in an attempt to pursue th…