Materials Literature
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Two new azido-bridged Fe(III) Schiff base complexes, [Fe(salen)N 3 ] and [Fe(MeO-salen)N 3 ]·2H 2 O, [salen = N , N '-bis-salicylaldehyde(ethylenediimine) and MeO-salen = N , N' -bis-3-methoxysalicylaldehyde(ethylenediimine)] have been synthesized, characterized and studied cryo-magnetically. A new isomeric form of th…
In this paper we present the synthesis and the characterization of cyclophosphazenes substituted with allyl groups, their transformation in epoxide-containing cyclophosphazenes and the final utilization of these compounds as chain extenders in combination with polyamides. The reaction at high temperature of Nylon-6 wi…
The selective staining of the polyisoprene block in a polystyrene–polyisoprene–polystyrene triblock copolymer enables nanoparticles of sputtered gold to be patterned into stripes, templated by the stained block copolymer lamellae.
In this study, the low voltage phosphor film for field emission display (FED) is prepared by electrophoresis. The influence of the deposition parameters, such as deposition time, deposition voltage, electrode distance, and stirring speed on the electrophoresis and luminescence of phosphor film are investigated. The op…
The processing, microstructures and properties of La0.7Sr0.3Mn1–xZnxO3 perovskite manganite, with x= 0; 0.1, 0.2, and 0.3 have been investigated. X-ray diffraction, scanning electron microscopy (SEM) and other characterisation methods were used to study the relations of microstructure and properties. The X-ray powder…
Although chlorites are an important source of Mg and micronutrients in soils, little is known about their weathering behavior in acidic environments. The effect of organic (acetic, oxalic, citric) and inorganic (hydrochloric, nitric, sulfuric) acids on the dissolution of ripidolite was studied at 25°C over an acid con…
The neurotoxic lipopeptide (+)-kalkitoxin was synthesized by a route which employed asymmetric organocopper conjugate addition followed by in situ enolate alkylation to install the anti,anti-1,2,4-trimethyl relationship of the toxin; the synthesis of kalkitoxin required sixteen steps and proceeded in 3% overall yield.
Acid-induced cyclization of meso-tetraphenyl-2,3-secochlorin-2,3-dialdehyde produced meso-diphenylindaphyrin, a novel secochlorin-based chromophore in which linkages between the o-phenyl and the β-position force the meso-phenyl groups into co-planarity with the porphyrinic π-system.
The photophysicochemical changes of vinyl polymers (polyethylene, polystyrene and poly(vinyl alcohol)) under 172nm vacuum ultraviolet (VUV) light irradiation from Xe2 excimer lamps were investigated by means of contact angle measurements, X-ray photoelectron spectroscopy and infrared absorption spectroscopy. The bond…
We report the quantum yields for singlet oxygen production by a series of porphyrazines (pz) of the form M[pz(An;B4-n)] (Scheme 1), where the peripheral substituent A is [S-R]2 with R = (CH2CH2O)3H, B is a fused alpha,alpha'-dialkoxybenzo group and M = 2H, Mg or Zn. These compounds show intense near-IR absorbance/emis…
We analyzed the interaction of cerium ions with surface intermetallics on Al 2024-T3 in NaCl media under open circuit conditions at pH 3 using scanning electron microscopic, Auger-electron spectroscopic (AES), and energy dispersive X-ray techniques (EDX), as well as electrochemistry. The results indicate that cerium d…
Aluminium-based composites with quasicrystalline particles as reinforcements were synthesized via the powder metallurgy processing route. In order to obtain bulk samples with a nanoscale microstructure most equivalent to that resulting from rapid solidification, powders of Al-Mn-Ce alloys were prepared by pulverizatio…
With each new generation of integrated circuits and other nanostructured devices produced at ever-decreasing length scales, the extension of liquid-phase processes for the manufacturing of these devices is uncertain. The current work investigates the ability of liquids to wet nanoscale features. A model for wetting ti…
Foam bubbles of constant mean curvature with a number of faces between 3 and 32 have been computer generated. The surface area per unit volume is only weakly dependent upon the number of faces, which allows an approximate equation for the energy of a three-dimensional foam to be derived. A further relation between the…
The change of the axial bond length in the antimony(V) N-confused tetraphenylporphyrin dibromide complex was demonstrated by protonation and confirmed from X-ray single crystal analyses.
Dendrimers constitute a fascinating class of monodisperse, highly branched macromolecules which are the object of continuously increasing interest. The possibility of introducing selected chemical units in predetermined sites of the dendritic structure gives rise to the possibility of performing specific functions at…
A sodium chloride supported cobalt catalyst was found to be active in the synthesis of carbon nanotubes by a CCVD method.
Metal dusting is a severe form of corrosive degradation of metals and alloys at high temperatures (350-950°C) in carbon-supersaturated gaseous environments. Fe, Ni, and Co, as well as alloys based on these metals are all susceptible. The corrosion manifests itself as a break-up of bulk metal to metal powder, hence, th…
The metal-metal bonded indium porphyrin-osmium cluster complex [(TPP)InOs3(mu-H)2(CO)9(mu-eta2-C5H4N)] was first synthesized and characterized using the indium porphyrin hydride as the precursor. The complex has very good optical limiting performance with determined optical limiting threshold of 0.4 J cm(-2).
The octahedral complexes cis- and trans-[Ru(CN)2(CNtBu)4] are prepared in quantitative yields from the reaction of Ru3(CO)12 with an excess of the isocyanide and under CO pressure. During the reaction, part of the isocyanide ligands are reductively cleaved to yield the cyanide ligands, isobutene and hydrogen. The latt…