Materials Literature
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Polyaniline-gold nanocomposites containing polyaniline nanostructures attached to well-dispersed uniform-size gold nanoparticles were obtained using a surface initiation approach.
Several new ruthenium-nitrosyl conjugates with meso-4′pyridylporphyrins, namely the two anionic isomers [nBu4N][trans-RuCl4(4′MPyP)(NO)] (1) and [nBu4N][cis-RuCl4(4′MPyP)(NO)] (2), the two neutral isomers [mer,trans-RuCl3(4′MPyP)2(NO)] (3) and [mer,cis-RuCl3(4′MPyP)2(NO)] (4), and the tetraruthenated adduct [nBu4N]4[4…
Dendritic solidification with forced convection and free convection driven by contraction and thermo- solutal buoyancy is simulated in two-dimensional space using a sharp-interface model. Both pure substances and alloys are considered. The model is formulated using the finite element method and works directly with pri…
We report on new thermotropic liquid-crystalline oligo(amino acid) derivatives forming columnar structures. These are based on branched oligo(glutamic acid)s and 2-(3,4-dialkyloxyphenyl)ethyl moieties. An oligo(glutamic acid) derivative, alpha,gamma-bis(L-glutamoyl) L-glutamic acid tetra[2-(3,4-dioctadecyloxyphenyl)et…
The aim of this work is the development and testing of a control system for solid oxide fuel cell hybrid systems through dynamic simulation. Because of the complexity of these cycles, several parameters, such as the turbine rotational speed, the temperatures within the fuel cell, the differential pressure between the…
Durable alloy foils are needed for gas turbine recuperators operating at 650°–700°C. It has been established that water vapor in the exhaust gas causes more rapid consumption of Cr in austenitic stainless steels leading to a reduction in operating lifetime of these thin-walled components. Laboratory testing at 650°–80…
The reaction mechanism of a manganese precursor, tris(dipivaloylmethanato)manganese , was investigated in liquid delivery metallorganic chemical vapor deposition (MOCVD) of manganese oxide films. The behavior of in the gas phase was analyzed under actual CVD conditions by in situ infrared absorption spectroscopy. The…
Single walled carbon nanotubes (SWNTs) have been coated with fluorine-doped silica by liquid phase deposition (LPD) using a silica–H2SiF6 solution and a surfactant stabilized solution of SWNTs. The coating of individual SWNTs versus small ropes is controlled by the choice of surfactant. Since the LPD reaction is perfo…
A front-tracking technique on a fixed Cartesian grid, based on the kinetics of dendritic growth, is used to model the progress of an undercooled columnar dendritic front in non-equilibrium 2D solidification controlled by conduction and thermal natural convection. The effect of the alloy latent heat of fusion is includ…
Through density functional calculation and NMR spectroscopy, an unusual intermediate-spin electronic structure (d(xz)d(yz))3(d(xy))1(d(z)2)1 has been assigned to the six-coordinate saddled [Fe(OETPP)(THF)2]+ complex instead of the corresponding ruffled [Fe(TiPrP)(THF)2]+ complex.
The effect of nano sized particles compared to micro sized particles is explained by the high surface to volume ratio. The influence of different types and concentrations of nano and micro sized fillers on the erosion resistance, the thermal conductivity and the dielectric properties of an unfilled silicone elastomer…
Commercial MAXWELL capacitors were investigated by ac impedance spectroscopy, chronoampero- metry, constant current discharge and other transient techniques in order to determine rated capacitances reliably. Capacitance is outlined as a dynamic quantity that depends on the voltage and the state of charge of the superc…
بيوسوربشن الصدارة ببكتيريا جرام-ف، إما غير المغطى ( فرينديي سيتروباكتر ) أو مغطى ( نيومونيا كليبسيلا ) ميز . بيوسوربشن الصدارة وجد ليتأثر بف الحل، يوقع بالأحرف الأولى على تركيز المعدن، و كمية من الخلايا المسحوقة المجففة و وقت الاتصال . من ثم، سعة البيوسوربشن الأفضل، بالبكتيريا المختبرتين، نيلت في ف 4، تركيز الدليل الأ…
This paper details improvements of the d33 co-efficient for thick-film lead zirconate titanate (PZT) layers. In particular, the effect of blending ball and attritor milled powders has been investigated. Mathematical modeling of the film structure has produced initial experimental values for powder combination percenta…
Single-walled carbon nanotubes (SWNTs) have been effectively wetted and dispersed in saturated sodium hydroxide (NaOH) alcohol-water solutions with little surface damage or shortening of the tubes; the treated material was dissolvable as individual tubes in many common organic solvents.
Thermomechanical processing parameters were adjusted during the processing of Ti-IF steel sheet to obtain microstructures with different grain sizes and precipitation states. The grain size and precipitation state were fully characterized for each specimen in order to investigate the effect of each on mechanical prope…
Transparent magnetic semiconductor films were prepared on glass substrates by a novel chemical process involving ( i ) ZnO deposition from an aqueous solution and ( ii ) the introduction of Fe impurities into the ZnO in another aqueous solution. The former/latter aqueous solutions contain only zinc/iron nitrate and di…
Ultrafine grained microstructures and micro-textures formed dynamically during single-pass, high-Z, large-strain deformation have been analyzed in 0.15C steel. A single pass compression technique capable of imposing large plastic strain up to 4 was employed in the present study. Hardness test data revealed work harden…
Mesoporous hybrid silica-based spheres with functionalized surfaces and abundant highly ordered domains are obtained using for the first time a simple synthetic route based on spray-drying processes.
Blends of 80/20 CPE/NR filled with various silica loadings were prepared, and their properties were determined. It was found that cure properties are influenced significantly by the addition of precipitated silica. Scorch time and cure time decrease with increasing silica loading, which could be explained by the therm…