Materials Literature
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The grafting of polystyrene with controlled molecular weight and narrow molecular weight distribution onto the carbon black surface through the trapping of polymer radicals formed by the thermal dissociation of 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-terminated polystyrene (PSt-TEMPO) by the carbon black surface…
A variety of colloidal and polymeric sols, some doped with transition‐metal oxides, were investigated as potential precursors to calcium hexaluminate (CaAl 12 O 19 ) in an attempt to enhance reactivity and lower the formation and texturing temperatures of phase‐pure powders and films. One undoped polymeric sol was fou…
Covalent end-on grafting of poly(ethylene glycol) (PEG) onto a polysulfone (PSf) surface using α-4-azidobenzoyl-ω-methoxy-PEG (ABMPEG) is described. Photoreactive ABMPEG was synthesized by reacting monomethoxy-PEG (MPEG) with 4-azidobenzoyl chloride, yielding complete substitution of the hydroxyl groups. After adsorpt…
New polythiophene derivatives containing a nonlinear optical chromophore were prepared via copolymerization of 3-alkylthiophene and 2-[ N -ethyl- N -[4-[(4-nitrophenyl)azo]phenyl]amino]ethyl 3-thienylacetate. The presence of chromophore groups in the copolymer chain was confirmed by 1 H NMR, 13 C NMR, and FTIR spectro…
Subsolidus phase relationships in the Ga 2 O 3 –In 2 O 3 –SnO 2 system were studied by X‐ray diffraction over the temperature range 1250–1400°C. At 1250°C, several phases are stable in the ternary system, including Ga 2 O 3 ( ss ), In 2 O 3 ( ss ), SnO 2 , Ga 3− x In 5+ x Sn 2 O 16 , and several intergrowth phases tha…
Single crystals of (Pro-Pro-Gly)10 were grown by the hanging drop method. The crystals diffracted to a resolution of 1.8 A. In the crystals the polypeptides form triple helices that aggregate end-to-end mediated by the solvent molecules, with the basic repeat being 20 A along the helical axis. Analysis of the 20 A str…
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…