Materials Literature
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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.
Lead magnesium niobate Pb(Mg1/3Nb2/3)O3 — lead titanate PbTiO3 [abbr. as (1 — x) PMN — x PT] ferroelectric ceramics with different excesses of MgO and PbO were systematically studied under different processing conditions for ferroelectric refrigeration application. It was found that the excess amount of MgO and PbO, a…
A new perovskite related Sr0.97NbO3 phase has been synthesized. Although both powder X-ray diffraction and selected area electron diffraction studies suggest a primitive cubic perovskite structure with ap ≈4.023 Å, high resolution powder neutron diffraction reveals a subtle lattice distortion from cubic symmetry. The…
Raman microscopy has been used to study kaolinites and dickites and their intercalates and to identify dickites in kaolins at low concentrations. During the intercalation, with potassium acetate, of a low defect structure kaolinite, several crystals provided significantly different Raman spectra. This led to the propo…
Depending on the reaction conditions and the ionic radius of the lanthanide ion, tetraphenyldisiloxanediol, (Ph2SiOH)2O, reacts with [Ln{N(SiMe3)2}3{LiCl(thf)3}3] (Ln = Eu, Gd, Sm) to afford novel heterobimetallic rare earth disiloxanediolates, some of which can be regarded as ‘inorganic lanthanide metallocenes’; a ri…
Electrochemical studies were made of the influence of Cu on pitting behavior and active dissolution of 25% Cr duplex stainless steels (DSS) in chloride-containing neutral and acid solutions. Alloys with increased Cu content showed higher pitting potentials (Ep) in 1 M hydrochloric acid (HCl) and 3.5% sodium chloride (…
The Schiff bases 2,2′-bis{N-[(2-diphenylphosphino)phenyl]formimidoyl}biphenyl (L1) and 2,2′-bis{[(2-diphenylphosphino)benzylidene]amino}biphenyl (L2) were synthesized from the appropriate amine and aldehyde. Their co-ordination behaviour towards PdII, PtII and NiII has been studied. Dinuclear complexes were formed whe…
Microcrystalline cellulose 19 parts was combined with sodium carboxymethylcellulose, hydroxypropylmethyl cellulose, hydroxypropyl cellulose or polyvinylpyrrolidone one part, either by spray-drying or physical mixing. This combined excipient (20%) mixed with lactose (80%) and water was added to aid formation of pellets…