Materials Literature
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Aluminate sodalites containing the telluride and tellurite ions have been synthesised for the first time. The structures of Sr8[AlO2]12(TeO3)2 and its reduced product Sr[AlO2]12Te2 have been determined using Rietveld refinement of powder neutron diffraction data. In Sr8[AlO2]12Te2 the anion occupies a position at the…
Abstract The concept of a regular polyhedra helix is defined and the full set of such moieties are analysed. It is found that apart from trivial cases, eight distinct RPH exist.
The effect of incorporating poly[styrene- b -(ethylene oxide)], PS- b -PEO into PS/PEO composites has been examined microscopically and dielectrically. The addition of block copolymer stabilizes the dispersion of PEO in PS and can produce composites of PEO in PS in which the PEO domain size ranges from the size of the…
143Nd/144Nd isotopic ratio and rare-earth impurities are examined for high purity neodymium oxide prepared by six chemical companies. The isotopic ratios of the reagents are grouped into four and vary from 0.511463 to 0.512238. Some of the reagents contain impurities more than 1 ppm for lanthanum, cerium and samarium.…
The interaction of hydrogen cyanide (HCN) and hydrogen isocyanide (HNC) with Ni(111) is studied by using ab initio embedding theory. The Ni(111) surface is modeled as a three-layer, 28-atom cluster with the Ni atoms fixed at bulk lattice sites. The present calculations show that both HCN and HNC bind to the surface in…
Adsorption kinetics of a polydisperse sample of poly(ethylene oxide) were studied using total internal reflectance fluorescence (TIRF), a method whose signal is approximately proportional to the adsorbed chain number . The initial stages of the adsorption process were found to be approximately transport-limited, domin…
We investigate the phenomenon of bond alternation in ring molecules of the type (CH)2n, which occurs due to the Peierls instability. We prove that the energy-minimizing configuration of bond lengths always has period two when n is odd. When n is even, a new instability may destroy the periodicity two as long as n is n…
Geometries, dimerization energies, and harmonic vibrational frequencies have been calculated for InMH 6 and MBH 6 (M = B, Al, Ga, and In) using MP2 and DFT methods. Results for B 2 H 6 and GaBH 6 show good agreement with experimental data, with both methods giving comparable accuracy. Trends in the properties of InMH…
Cincuenta y seis taxa de diatomeas del Orden Pennales, colectadas en Bahía San Antonio y proximidades (Prov. de Río Negro, Argentina) fueron estudiadas con microscopio óptico y microscopio electrónico de barrido. Cincuenta y cuatro de ellos son nuevos para el área. Licmophora hastata varoclavata Mereschkowsky, L. hyal…
近年, ごみ量の急増の傾向や埋立処分地の逼迫しているわが国では, ごみの減量化は, 処理の目的の中で大きなウエイトを占めるようになってきている。本文においては, この都市ごみ減量化および貯蔵可能なエネルギー回収技術として注目されているRDF (Refuse Derived Fuel: ごみ固形燃料) に関して, 技術的な側面を中心に概観してみた。内容としては, 1.廃棄物処理の現況とRDFのニーズ2.RDFシステムの開発経緯 (海外およびわが国) 3.RDF技術・システムにおける課題と対応策4.RDFの技術評価等を述べ, まとめとして, ごみの固形燃料化技術については, 基本的には, 固形燃料化施設の稼働実績もあり, 条件付きなが…
The rates of replacements of MeOH by pyridine (py) and imidazole (imH) type ligands L (=4CN-py, 3CN-py, 3Cl-py, 4Cl-py, py, 4Et-py, 4Me-py, 4NH 2 -py, 4(Me) 2 N-py; 4,5(Cl) 2 -imH, 4,5(CN) 2 -imH, Bz-imH, imH, 1Et-im, 1Me-im, 2Me-imH, 2Et-imH) in [(Co III P(MeO)(MeOH)] (P = protoporphyrin IX dimethyl ester) were measu…
Polyfuran films doped with perchlorate anions (PFu/ClO 4 ) were studied by scanning and transmission electron microscopies and electron diffraction in order to analyze their morphology and microstructure. Film generation was carried out electrochemically at constant potential, E d = 2.6 V (Ag/Ag + ), onto platinum ele…
The heat storage rate of a single pellet of magnesium nickel hydride was experimentally and theoretically studied for recovering waste heat from a industrial plant. The Mg–Ni hydride fine powder as a raw material was coated by copper thin film to obtain enough strength against hydrogen absorption/desorption cycles. Th…
The evolution of a RuO2–TiO2 film electrode has been studied as a function of temperature by secondary ion mass spectrometry (SIMS). The coating mixture prepared on a titanium support from an isopropyl alcohol solution of hydrated ruthenium chloride and titanium diisopropoxide bispentane-2,4-dionate precursors was hea…
Conducting polymers are materials of recent origin. They are obtained by polymerisation of simple organic monomers and doping with electron acceptor or donor species and show conductivity ranging from that of a semiconductor to that of metal. These materials are now available with unique electronic and optical propert…
Tartaric acid, malic acid, and glyceric acid were copolycondensed with glycolic acid at various molar ratios in feed to quickly synthesize biodegradable oligoesters. They were likely to have a moderately cross-linked structure with relatively low molecular weights and hydrophilic groups on the chains. In addition to m…
50 phr each of three hydrocarbon resins of different aliphatic-aromatic nature was added to a solvent based polychloroprene adhesive. The hydrocarbon resins were characterized using infra-red (IR) spectroscopy and differential scanning calorimetry (DSC) measurements. The properties and compatibility of the polychlorop…
The photodecomposition of Fe(CO) 5 adsorbed on the Au(111) surface at ∼90 K has been studied using IR reflection absorption spectroscopy (IRAS), thermal desorption spectroscopy (TDS), and X-ray photoelectron spectroscopy (XPS). IRAS and TDS show that Fe(CO) 5 is molecularly adsorbed on the surface and desorbed complet…
An electron spectroscopy for Chemical Analysis (ESCA) characterization of films based on collagen-poly(vinylalcohol) blends, cross-linked by dehydrothermal treatment is reported. The semiquantitative analysis indicates a remarkable enrichment of collagen in the surface with respect to its initial percentage utilized t…
The sorption and reduction of NO 2 have been studied on ammonium 12-tungstophosphate, a microporous derivative of 12-tungstophosphoric acid. NO 2 penetrates into the bulk structure, where reduction by NH 4 + occurs. Nitrogen, oxygen, and nitrous oxide are produced. Nitrogen is desorbed into the gas phase while oxygen…