Materials Literature
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The incorporation of 1.0–5.0 mol% Ce3+ or La3+ ions in MSU-X alumina molecular sieves, prepared through an N○I○ assembly pathway, dramatically improves their thermal stability without altering the mesopore size or the wormhole channel motif.
Transition metals are powerful three-dimensional templates, which can gather various functionalized ligands and orient them in a precise fashion so that complex multicomponent molecular systems can be obtained without constructing covalently-assembled edifices. The compounds thus prepared exhibit precise chemical or p…
In this paper, a new method is proposed to avoid acoustic-resonance-related instabilities in metal halide lamps when operated with a high-frequency electronic ballast. Angle modulation of the inverter switching pattern has been used as a vehicle to randomize lamp driving frequency and to limit lamp power spectrum belo…
In neutral bicarbonate-containing solutions, the predominant pathway for peroxynitrite decomposition was CO 2 -catalyzed formation of nitrate ion; that is, CO 2 was regenerated in the process. When nitrite ion was present, HCO 3 - also formed during ONO 2 - decomposition. The data could be reproduced by a kinetic mode…
The synthesis and characterisation of oligomers and polymers containing gold or platinum atoms in the backbone are reported. The polymers range in structure from the conjugated, rigid-rod type containing linear gold(I) centres to hyperbranched or dendrimeric materials containing octahedral platinum(IV) centres.
Multilayer films of molybdenum oxide were prepared by means of alternate adsorption of ammonium octamolybdate ((NH 4 ) 4 [Mo 8 O 26 ]) and poly(allylamine hydrochloride) (PAH). The films were reproducibly grown at each adsorption cycle, as monitored by a quartz crystal microbalance. Adsorption of PAH on the surface of…
Cascade molecules/dendrimers are highly branched, regularly built molecules that have now been known for two decades. While efforts in the early stage of their investigation were directed towards the development of higher generation structures and new dendritic architectures, the design of functional dendrimers is mor…
A gyroid-to-sphere shape transition has been unveiled in the growth of mesoporous silica morphologies that are synthesized under quiescent acidic aqueous conditions. It can be induced by a decrease of the acidity for a surfactant-based gyroid preparation. As the acidity is gradually lowered from the gyroid domain, the…
Addition of trace SO2 (ca. 8 ppm) to a reactant gas containing NO substantially enhanced the oxidation rate of carbon black mixed with a Pt/SiO2 catalyst, which is attributed to SO3 (or H2SO4) catalyzing the oxidation of carbon by NO2.
Chalcogenide glasses of As20S80, Ge20As20S60, As40S60 and As40S57Se3 were prepared. The wavelength dispersions of the Faraday effect for these glasses were examined. The Verdet constants of the glasses decreased at wavelengths longer than the absorption edge of the glasses. The values of the Verdet constants of the gl…
Abstract With the use of the Boltzmann superposition principle, a statistical theory of rubber elasticity, and phenomenological theory, the hysteresis loss at high strain (greater than 100%) of nonlinear viscoelastic materials has been quantified in terms of material parameters. The theory incorporates both experiment…
The effects of Schiff base-metallocomplexes on the corrosion of mild steel were investigated by corrosion weight loss measurements, electrochemical measurements and surface analyses in various aqueous solutions such as hydrochloric acid solution and pseudo cooling water. The maximum value of inhibition efficiency on t…
1-Methyl-2,5-bis[1-(4-phenylurazolyl)] pyrrole was prepared from the reaction of 4-phenyl-1,2,4-triazoline-3,5-dione with N-methylpyrrole in methylene chloride solution. This compound was converted to its potassium dianion salt upon reaction with potassium hydroxide in absolute ethanol. The reaction of this dianion sa…
The purpose of this investigation was to analyze the modified Young's modulus of microcrystalline cellulose tablets at comparatively low relative densities, based on concepts of percolation theory. Tablets were prepared and tested using a Zwick 1478 universal testing instrument. For statistical evaluation a new method…
The oxidative decarboxylation of α-aryl carboxylic acids to the corresponding carbonyl derivatives was observed in catalytic systems containing tetrabutylammonium periodate and metallotetraphenylporphyrins (metal=FeIII or MnIII) at room temperature.
Detailed loss and current distributions in the foil-wound low-voltage winding of a 6 MVA transformer using a finite-element analysis package are presented. The foil-winding eddy loss is estimated and its variation with clearance to yoke is examined. Plots of foil current and eddy-current density and loss-intensity dis…
The development of crazes in polycarbonate is investigated with the method of ultra small angle X-ray scattering of synchrotron radiation. Measurements at T = 130°C are discussed. The two-dimensional scattering patterns are analysed by means of a simple fibrillar model of the crazes. The geometrical parameters of the…
A simplified mechanism for the depolymerization of nylon-66 and nylon-6 mixtures via the ammonolysis route is proposed here. The mechanism includes the amide link breakage and amide end dehydration (nitrilation) reactions, plus the ring addition and ring opening reactions for cyclic lactams in nylon-6. On the basis of…
The first use of polyhedral silsesquioxanes to organize ensembles of biologically relevant motifs is described. N-Protected amino acids and peptides can be attached to [H2N(CH2)3]8Si8O12 1 and [p-HOCH2C6H4]8Si8O12 2 in either a convergent fashion or a divergent fashion to produce peptidyl silsesquioxanes in excellent…
Carboxylate-bridged cobalt–lanthanide complexes [Co2Nd(O2CCMe3)6(C9H7N)2(NO3)] and [Co2Er2(O2CCMe3)8(C9H7N)2(NO3)2] have been prepared and structurally characterised by X-ray diffraction; both of them are found to be antiferromagnetically coupled.