Materials Literature
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A quinoidal porphyrin has been synthesised with such a curved pi-system that pi-pi stacking leads to the formation of cyclic trimer aggregates in the crystal, which pack to generate cylindrical channels with an internal diameter of 1.0 nm.
Epoxy resin containing nano-scale silica particles was prepared to evaluate partial discharge degradation and insulation breakdown strength. This material showed superior partial discharge resistance and breakdown strength to epoxy resin without silica particles. Moreover, the focus was on dimension of silica particle…
Abstract A self‐consistent set of thermochemical data for 88 chemical species in the B/F/H/N system is obtained from ab initio electronic structure calculation. Calculations were performed for both stable and radical species. The quantities calculated include the atomization energy (∑ D 0 ), heat of formation (Δ H f )…
In this paper, we report on the synthesis of polypyrrole (PPy) and hybrid (Au-PPy-Au) nanowire arrays of controlled dimension by an all electrochemical template method. PPy nanowires with an average diameter of only 38-160 nm were obtained by electropolymerization in well-defined conditions within the pores of homemad…
Traditionally, mineral oils have been one of the most important quenchants used. However, their substantial deficiencies with respect to environment friendliness and toxicity as well as long-term, low-cost supply necessitate the search for alternative replacement media. Quenching performance of petroleum oils is limit…
The preparation and crystal structure of two oxalato-bridged NaI–FeIII compounds, [Na3Fe(ox)3(H2O)4]·H2O (1) and [FeII(phen)3][NaFe(ox)3(H2O)3]·4H2O (5), two mononuclear FeIII complexes AsPh4[Fe(bipy)(ox)2]·H2O (3) and AsPh4[Fe(phen)(ox)2]·H2O (4) and an oxalato-bridged FeIII compound [AsPh4]4[Fe2(ox)5]·5H2O (2) (ox =…
Hollow spherical particles with protein-silica hybrid shell structures have been synthesized through a combination of the catalytic activity of the protein and sonochemical treatment; the morphologies of the particles were controlled by varying the protein concentration.
An evaluation method for hydrogen embrittlement (HE) susceptibility for ultra high strength steel was studied. The study showed that the evaluation results obtained by the method were independent of the stress concentration factor and the dimension of the specimen. A commercial 0.40C-0.24Si-0.81Mn-1.03Cr-0.16Mo (mass%…
Abstract Calculations based on density functional theory predict the ground state of B 12 and B to be a convex planar configuration with C 1 symmetry. A small ionization‐induced structural change in B 12 is also predicted. It is suggested that multicentered bonds together with delocalized charge density are dominant f…
We report a novel synthesis of luminescent CdS nanorods which, unusually, are predominantly of the cubic phase.
The complex Na3[Cu3(mal)3(H2O)] x 8H2O was obtained from evaporation of an aqueous solution containing Cu(OAc)2, malic acid (HO2CCH2CHOHCO2H) and NaOH and was characterised by X-ray diffraction on single crystal, X-band and high-field EPR spectroscopy (HF-EPR) and magnetic susceptibility measurements. The trinuclear c…
Organosilica microspheres synthesised via a novel surfactant-free emulsion-based method show applicability towards optical encoding, solid-phase synthesis and high-throughput screening of bound oligonucleotide and peptide sequences.
A long lasting coherent oscillation with a sharp frequency of f(p) = 2 THz is observed in fs pump probe spectra for B <-- X excitation of Br2 in solid argon. It exactly matches the frequency of a coherent zone boundary phonon (ZBP) of the Ar environment. The ZBPs have a vanishing group velocity v(g), thus they stay in…
Zinc and zinc oxide electrodes with fibrous morphologies were prepared to exploit their high interfacial areas and superior electrical conductivity for the enhancement of electrochemical and photoelectrochemical properties.
A nanoporous alumina template made from a multilayer metal film structure has been developed that allows for the in situ removal of the electrically insulating alumina barrier layer, exposing a Pt electrode at the pore bases. This barrier-free nanoporous system is of great use for dc electrodeposition of a wide variet…
A new chiral binaphthyl salen ligand with rigid polyaromatic sidearms gives monohelical complexes (Fe(II) and Zn(II)) of predetermined handedness.
New redox active molecular macrocyclic architectures characterized by a direct connection between dipyrrin, tripyrrin and ferrocenyl fragments have been synthesized and characterized. Contrarily to fully conjugated porphyrins, in which four pyrrole moieties contribute to the overall aromatic pi-electronic system and b…
Entry into a new class of tetra- and dicopper clusters was assisted by a fine steric tuning of bulky amidinate ligands that provide spin-delocalizing superexchange pathways in class III mixed-valence clusters, the properties of which are best understood without invoking metal-metal bonding.
We present the results of a series of ab initio calculations on the ground states and the low lying excited states of the F and F+ centers in bulk ZnO. Both types of F centers are oxygen vacancies, causing rather strong distortions of the local geometries. The calculations were performed by means of wave function base…
Ba Mg Al 10 O 17 : Eu 2 + (BAM) blue phosphor was annealed in air at temperatures of 500 – 1000 ° C to investigate its thermal degradation. The photoluminescence of annealed samples was studied in ultraviolet and vacuum ultraviolet (VUV) regions, respectively. The observed Eu 3 + emission revealed that the oxidation o…