Materials Literature
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An investigation is made concerning the negatively charged environment, which the oxygen atoms of a glass provide for hosted metal ions, and the extent to which this changes on varying the glass composition. For Mn2+, d–d spectra show that the changes in the (average) oxygen electronic density of the glass are faithfu…
We describe electrochemical quartz crystal microbalance studies of polypyrrole films exposed to concentrated aqueous sodium tosylate solutions, in which the polymer is non-permselective in doped and undoped redox states at equilibrium. Then, sources and sinks of salt within the film open up new mechanistic possibiliti…
It is believed that the interactions between the biological environment and biomaterial surface are the key factors influencing its biocompatibility. Therefore, plasma processing, which can vary the surface properties without altering the bulk properties, has been considered as one of the important techniques for impr…
Metallocryptands based on trigonally coordinated Pt(0) or Pd(0) with P2phen [2,9-bis(diphenylphosphino)-1,10-phenanthroline] bind Pb(II) ion through very strong, closed-shell metallophilic interactions; their syntheses, characterization and X-ray crystallography are presented.
Photosensitized luminescence in the near-infrared region of five low vibrational β–diketonato neodymium(III) complexes, tris(1,1,1,5,5,5-hexafluoroacetylacetonato)neodymium(III) (1), tris(4,4,5,5,5-pentafluoro-1-pentafluorophenyl-1,3-pentanedionato)neodymium(III) (2), tris(4,4,5,5,6,6,6-heptafluoro-1-pentafluorophenyl…
The new unsymmetrical [Bu4N][Ni(Pri2timdt)(dmit)] 4 and [Bu4N][Ni(Pri2timdt)(mnt)] 5 dithiolene complexes (Pri2timdt is the mono-anion of 1,3-diisopropylimidazolidine-2,4,5-trithione; dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate; mnt = maleonitriledithiolate) have been prepared from the reaction of the neutral complex…
A standardized format for partial discharge (PD) data recorded in gas-insulated switchgear (GIS) was proposed recently by a CIGRE Task Force (15.03.08). Being an open structure, the PD CIGRE data format can be used for all HV apparatus and equipment. Such a format is necessary to process PD measurements from any PD ac…
Silver nanoparticles encapsulated within boron nitride nanocages were produced from mixtures of boric acid, urea and silver nitrate upon reduction at 700 °C in hydrogen; this is a useful fabrication method for the mass production of boron nitride nanocapsules at low temperatures compared to the ordinary arc discharge…
The silicone-based coating applied to 345 kV post insulators in a substation on the shore of Long Island Sound has depolymerized over a period of about 7 years although no in-service failures have occurred. However, the increasing rate of depolymerization suggests that the coatings will have to be renewed in the near…
Fracture mechanisms in galvannealed coatings have been studied by performing draw bead tests on galvannealed Ti stabilized interstitial free and Aluminum killed low carbon steel sheets and by investigating coating microstructures by scanning electron microscopy. Galvannealing treatments, on samples galvanized using an…
In this work, we investigated the thermal degradation behavior of segmented polyurethane (PUR) elastomers before and after UV irradiation. The thermal degradation of PUR elastomers was studied over the temperature range of 25–600°C in an atmosphere of nitrogen using thermal gravimetric analysis (TGA). Four series of P…
The electronic structure of the fully lithiated benzene molecule has been calculated at different levels of approximation with particular attention paid to its second hyperpolarizability. It has been estimated that lithiation of the benzene molecule may lead to the enormous increase of the second hyperpolarizability.…
A novel copper(II)–praseodymium(III) hetero-polynuclear complex [Cu6PrL6][Pr(H2O)10]·14H2O (H3L: N-carboxymethyl-N-(2-carboxyphenyl) glycine acid) has been structurally and magnetically characterized, which consists of a molecular wheel of six Cu(II) ions with a Pr(III) ion axle.
The development of injectable microspheres for anticancer drug delivery into the brain is a major challenge. The possibility of entrapping 5-fluorouracil (5-FU) in chitosan coated monodisperse biodegradable microspheres with a mean diameter of 10-25 um was demonstrated. An emulsion of 5-FU (in water) and polylactic ac…
Sexual reproduction in the domoic acid–producing pennate diatom Pseudo-nitzschia multiseries (Hasle) Hasle is dioecious and involves pairing of two morphologically isogamous parent cells (gametangia) and the production of two gametes per gametangium. Gamete fusion leads to the formation of zygotes, which elongate into…
A novel AB2 monomer, 4-(fluorophenyl)-4′,4″-(bishydroxyphenyl) phosphine oxide, was synthesized. The monomer was successfully polymerized to a modest molecular weight with various catalysts, including K2CO3 and Cs2CO3/Mg(OH)2. Hyperbranched polymers exhibited exceptionally high thermal stability and solubility in conv…
Porous germanium (PG) is prepared by a novel bipolar electrochemical etching (BEE) technique; scanning electron microscopy (SEM) clearly reveals formation of a porous layer up to a few microns thick that is Ge–Hx terminated as indicated by FTIR spectroscopy; the hydride terminated PG material is quite resistant to oxi…
Sulfonated polyanilines (SPANs) with sulfur-to-nitrogen ratios of 0.05–0.40 were prepared by the copolymerization of aniline (ANI) and 3-aminobenzenesulfonic acid [metanilic acid (MA)] with ammonium peroxodisulfate in 1 M HCl at various MA/ANI and oxidant/monomer ratios and temperatures. The SPANs degree of oxidation,…
The solid surface tension γsv of hydrophobic polymer powders has been determined using the capillary penetration technique. By plotting Kγlv cos ζ, where K is a geometric factor, versus the liquid surface tension γlv, the following values of γsv were directly derived from the curves: poly(tetrafluoroethylene) γsv = 20…
Templated silicate molecular sieves exhibiting templated super-micropores in the range 1.0–2.0 nm and interesting pore symmetries bearing similarity to the Lα, SBA-2 (P63/mmc) and Mα (cmm) phases have been prepared by exploiting the novel aggregation properties of a new family of ω-hydroxyalkylammonium bolaform surfac…