Materials Literature
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Ti(70)Zr(10)Co(20) containing an icosahedral quasicrystalline phase has been fabricated, and presents high activity and selectivity in catalyzing the oxidation of cyclohexane with oxygen under solvent-free conditions.
Acetate-induced demetalation of a {gamma-SiW(10)Fe(2)}-based dimer affords an acetato/hydroxo-bridged triiron cluster stabilized by two isomerically distinct Keggin units.
Matrix isolation IR spectroscopy has been used to study the vacuum pyrolysis of 1,1,3,3-tetramethyldisiloxane (L1), 1,1,3,3,5,5-hexamethyltrisiloxane (L2) and 3H,5H-octamethyltetrasiloxane (L3) at ca. 1000 K in a flow reactor at low pressures. The hydrocarbons CH3, CH4, C2H2, C2H4, and C2H6 were observed as prominent…
This work analyses the nature of temporal patterning of the anodic potential induced by chlorides during polarization of iron under current-controlled conditions in acid solutions. It is shown that potential oscillations emerged as a result of the local chloride attack of a thin oxide layer, which covers the iron surf…
Mixed-valent manganese phosphonate clusters [Mn(II)(8)Mn(III)(2)O(2)(O(3)PC(10)H(7))(4)(C(6)H(5)CO(2))(10)(py)(4)(H(2)O)(2)] (1) and [Mn(II)(4)Mn(III)(9)O(4)(OH)(2)(O(3)PC(10)H(7))(10)(C(6)H(5)CO(2))(5)(py)(8)(H(2)O)(6)] (2) are reported. Compound 1 is the first example of manganese phosphonate clusters prepared throu…
Calotropis procera produces copious amounts of latex, which has been shown to possess several pharmacological properities. Its local application produces intense inflammatory response. In the 10 cases of Calotropis procera -induced keratitis reported here, the clinical picture showed corneal edema with striate keratop…
Chelate evaporation method for rare earth and aluminum precursor delivery was used for “in-situ” MCVD fabrication of large core rare earth-doped optical fiber preforms. Vaporization conditions and device design are discussed. Preform results are analyzed.
OBJETIVOS: O presente estudo teve como objetivo cultivar condrócitos retirados da articulação do joelho de coelhos encapsulados em hidrogel de alginato (HA) e caracterizar a produção de matriz extracelular (ECM). MÉTODOS: A cartilagem articular foi removida do joelho de coelhos, com três a seis meses, fragmentada em p…
By using a novel terpyridine-based dye as a surface stabilizing agent, novel dye-capped Ag nanocrystals (NCs) were obtained. The growth dynamics of these dye-capped Ag NCs were monitored by UV-vis absorption spectroscopy. Interactions between the dye and the Ag NCs were investigated by 1H NMR spectroscopy. The dye-cap…
Electromagnetic radiation of a line source scattered by a nihility cylinder, coated with a double positive (DPS) or double negative (DNG) layer, is investigated theoretically. The response of coated nihility circular cylinder is observed and it is noted that how the results obtained for this configuration differ from…
Red-emitting phosphors based on gadolinium oxysulfate were synthesized in a single phase form by our original flux method using alkaline metal sulfate such as Na2SO4 and the 0.6Li2SO4--0.4Na2SO4 eutectic mixture, and photoluminescence properties were characterized. Addition of the flux is significantly effective to en…
Strength variation of alumina ceramics formed by dry-pressing of granules was examined by the number density of coarser defects. The Weibull modulus m was related to the exponent n of the power function of the number density of coarser defects by strength simulation; m = 1.82n - 1.92. The Weibull modulus was determine…
In this combined quantum chemical and EPR study we have investigated the formation of CO(2)(-) radicals by contact of CO(2) molecules with a K precovered MgO surface. K atoms have been deposited on polycrystalline MgO samples, and then exposed to CO(2). The typical EPR signal of the isolated K atoms disappears when th…
A new silyl terminated bent-core mesogen was synthesized which shows a randomly tilted SmCR phase and a columnar phase with p2gg lattice as new modes of self-assembly in this class of compounds.
The mechanism of low-temperature deformation in a fracture process of L1 2 Ni 3 Al is studied by molecular dynamic simulations. Owing to the unstable stacking energy, the [0 1] superdislocation is dissociated into partial dislocations separated by a stacking fault. The simulation results show that when the crack speed…
Nickel oxide-gadolinia-doped ceria thin films with a ceria composition of 80 at% Ce and 20 at% Gd were grown by pulsed laser deposition on sapphire and SiO2/Si wafers as well as on yttria stabilized zirconia polycrystalline substrates. Upon reduction of the NiO phase in a H2/N2 atmosphere at 600 degrees C, a stable th…
Pt nanoparticles supported on niobium (Nb)-doped titania were prepared using the alcohol reduction method. The Nb-doped was subjected to various heat-treatments. Depending on the heat-treatment either anatase or rutile was produced. The change in Pt morphology when deposited on supports that were treated under hydroge…
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A red phosphor, ( Sr , Ca ) 2 P 2 O 7 : Eu 2 + , Mn 2 + , for UV light-emitting diodes (LEDs) was synthesized under a reducing atmosphere, and its luminescent properties were investigated. The phosphor absorbs UV light at around 400 nm and efficiently emits red light at approximately 610 nm through an energy transfer…
Emilia sonchifolia (Lin)DC (compositae) has found various medicinal uses in folkloric medicine, as a cure for various ailment such as sore-throat, tonsillitis, styptic, vulnery, wounds healing, stomach ache, conjunctivitis, depurative, infantile tympanitis, anticonvulsants, bowel complaints and sores; aqueous extract…