Materials Literature
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The effects of mixed solvents used for casting films of diblock copolymer/homopolymer blends of poly(dimethylsiloxane)- co -polystyrene/polystyrene have been studied in detail at the surface of the films. The surface composition was determined over a wide range of detection depths using data from various spectroscopic…
The water-soluble conducting copolymer of poly(aniline-co-o-aminobenzenesulfonic acid) (PAOABSA) was synthesized directly from aniline and o-aminobenzenesulfonic acid and characterized by elemental analysis, FTIR, UV–Vis, X-ray powder diffraction, and XPS. The room-temperature conductivity of the copolymer can be chan…
Heteronuclear multiple quantum NMR is used to measure the paramagnetic 13 C shifts of the α substituents of the hemes in five different tetraheme ferricytochromes c 3 . The shifts of the 20 bis-histidine ligated hemes are assigned and then analyzed in terms of a model based on the π molecular orbitals of the heme unde…
Contrast in low energy electron microscopy (LEEM) originating in the phase of the imaging electron wave is discussed. A wave-optical model is reviewed in which LEEM step contrast is calculated as the interference of the Fresnel diffracted waves from terrace edges which meet at a step. Model predictions which take into…
We report the results of molecular dynamics simulations of a quasi-two-dimensional system designed to mimic the quasi-two-dimensional colloid suspensions studied by Marcus and Rice [Phys. Rev. E 55, 637 (1997)]. The simulations duplicate all of the important qualitative findings of Marcus and Rice, in particular the o…
Long-time self-diffusion in dispersions of rigid colloidal rods with an aspect ratio of 19 is studied with fluorescence recovery after photobleaching (FRAP) in isotropic and nematic phases. The long-time self-diffusion coefficient ${D}_{s}^{L}$ is found to decrease linearly with concentration up to $(L/D)\ensuremath{\…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of a Poly(ε-caprolactone) Monosubstituted First Generation Dendrimer by Lipase CatalysisArmando Córdova, Anders Hult, Karl Hult, Henrik Ihre, Tommy Iversen, and Eva MalmströmView Author Information Swedish Pulp and Paper Research Institute, STFI P.O. Box 5604…
Nanocrystalline lead zirconate titanate (PZT) powders, with a Zr:Ti ratio of 60:40, have been prepared from a solution of triethanolamine (TEA) and Ti 4+ , Zr 4+ , and Pb 2+ ions. The metal ions were in solution through complex formation with TEA. The soluble metal‐ion–TEA complex formed the precursor material when it…
Abstract All tool steels are heat treated to develop specific combinations of wear resistance, resistance to deformation or breaking under loads, and resistance to softening at elevated temperature. This article describes recommended heat treating practices, such as normalizing, annealing, austenitizing, quenching, pr…
A simple model for the design of selective catalytic reduction (SCR) process is presented. The two-dimensional mass transfer equation shown in Bai and Chwu (1997) is simplified and the analytic solution is obtained. The analytic solution is verified by the solution of the numerical two-dimensional model as well as pub…
Article Mikrostruktur und Wechselverfomnmgs- verhalten des mechanisch randschichtverfestigten Stahls Ck 45 was published on December 1, 1998 in the journal HTM Journal of Heat Treatment and Materials (volume 53, issue 6).
Abstract This article describes the methods and equipments involved in the preparation of specimens for examination by light optical microscopy, scanning electron microscopy, electron microprobe analysis for microindentation hardness testing, and for quantification of microstructural parameters, either manually or by…
The formation of scale under sulphuric acid pressure leaching conditions of a limonitic laterite ore was investigated. Experiments were conducted using a batch titanium autoclave in order to study the effects of acidity (0.15–0.40 M), and temperature (250–270°C) on scale formation. It was found that scale increases wi…
The synthesis of poly(thio- 1,4-phenylene) (PPS) at room temperature by the reaction of diphenyl disulfide with potassium persulfate (K2S2O8) in non-basic solvents, in the presence of trifluoromethanesulfonic acid, is reported. The reaction in chlorinated solvents, such as dichloromethane and tetrachloroethane, result…
Abstract Titanium metal passes through three major steps during processing from ore to finished product: reduction of titanium ore to sponge (porous form), melting of sponge and scrap to form ingot, and remelting and casting into finished shape. This article describes primary fabrication, including all operations that…
The unsolved problem of plastic waste utilization has led to a great interest in the development of studies of accelerated degradation of polymers. In this work the course of photo-oxidative degradation of some water soluble polymers such as poly(acrylic acid) (PAA), poly(methacrylic acid) (PMA) and poly(vinylpyrrolid…
The electrolytic manufacture of sodium hydrosulfite is affected by feedstock composition, electrode morphology, and electrode material. Here we show that porous graphite cathodes can provide the highest one‐pass conversion of sodium bisulfite to hydrosulfite, without contamination by sodium thiosulfate. For example, a…
By Mg doping of ZnS, the lattice constants and the band gap of Zn1−XMgXS host material were increased. The emission spectrum of Mn in Zn1−XMgXS shifted to shorter wavelengths than that of ZnS:Mn. The electroluminescent (EL) devices fabricated with the source of X=0.32 show 552 nm peak yellowish–green emission. Deposit…
Thin films of VO 2 single-crystalline on (0001) sapphire substrates have been prepared by visible pulsed laser ablation technique. The crystal quality and properties of the films are evaluated through electrical resistance measurement, x-ray diffraction (XRD), and Rutherford-backscattering spectroscopy/channeling (RBS…
Abstract Titanium and its alloys are used in various applications owing to its high strength, stiffness, good toughness, low density, and good corrosion resistance. This article discusses the applications of titanium and titanium alloys in gas turbine engine components, aerospace pressure vessels, optic-system support…