Materials Literature
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The effects of elements such as Ni, Mo, Cr, Cu, and V on the wear behaviour of high manganese steels have been reported extensively. Most researchers agree on the influence of many of the elements but disagree on the effect of Cr. A study has been conducted to evaluate the effect of 1.7 and 2.3 wt-Cr on high manganese…
A numerical simulation for polymeric foaming extrusion processes was conducted. Combining classical nucleation rate and bubble growth models with a non-Newtonian fluid model of a flow, a simultaneous bubble nucleation and growth behavior in a flow field was simulated. Simulation results were compared with the experime…
A homologous series of banana-shaped compounds (n =1-12) is described. The short-chain derivatives exhibit a B6 phase, while B6/B1 dimorphism is found for the pentyloxy and hexyloxy homologues. The B1 phase of the compounds having longer alkyloxy chains is changed to a B2 phase for the compounds with n =11 and 12. The…
External pressure (uniaxial or isostatic) is usually necessary to form a thin and defect‐free joint in green state joining of SiC ceramics. A successful method of joining SiC in the green state using a liquid polymer precursor, allylhydridopolycarbosilane (AHPCS), without applied pressure, is described. The thermal de…
Abstract The nanostructure of natural aluminosilicate nanofiber “imogolite” under acidic conditions was directly confirmed by observation with atomic force microscope (AFM) for the first time. The outer surface of imogolite was successfully hydrophobidized by chemisorption of a phosphonic acid derivative with an alkyl…
Novel chemical routes to high-quality nanodispersed quantum dots of Zn 3 P 2 have been developed. The precursors Me 2 Zn and HP t Bu 2 were thermolyzed in TOPO (tri- n -phosphine oxide) or 4-ethylpyridine, resulting in capped nanomaterial. The nanoparticulates described in this work were capped with either TOPO or 4-e…
High molecular weight poly(hydromethyl-co-dimethyl)siloxanes containing 0.6 and 3 mol-% of Si—H units are polar functionalized by the addition of various mono-, di- and oligosaccharides. Due to the hydrogen bond interaction between the carbohydrate moieties, the solution properties are strongly altered. Static and dyn…
Within the framework of the American Map of Atmospheric Corrosiveness (MICAT) project, 4 years of field research on atmospheric corrosion carried out in 14 countries of Ibero-America, this paper reports atmospheric copper corrosion in 21 unpolluted rural atmospheres and 45 marine atmospheres covering a broad interval…
The structural and optical properties of thin lead oxide films were studied. Thin films were prepared by reactive dc magnetron sputtering of lead (Pb) targets in an Ar/O2 mixture. The structure has been determined by x-ray diffraction measurements, which show that crystalline lead oxide films of different composition…
Abstract Polymer blending is useful for improving physical properties. Blends of transparent polymers are generally hazy. However, transparency is required in many products such as packages (especially PET bottles). The miscible blends, PET (polyethylene terephthalate)/PBT (polybuthylene terephthalate), maintain trans…
Microstructure and thermomechanical properties of polylactides (PLA) with different optical purity (OP) of the lactate units were studied in detail. Thermal analysis by DSC revealed that the melting (Tm) and glass transition (Tg) temperatures of PLA can be simulated by the theoretical equations of Flory and Fox, respe…
Presented is the effect of using various cladding materials with different conductivities and dielectric constants on the applied voltage for optoelectronic (OE) devices based on nonlinear optical (NLO) polymers. Using a conductive polymer, we have demonstrated a 3 to 13 times increase in the effective electro-optic (…
Twisted multiwalled carbon-nanotube (MWCNT) ribbons were observed with transmission electron microscopy. Particularly one cantilevered MWCNT ribbon had a twist present in the freestanding segment. An energetics analysis was presented supporting the hypothesis that twists in MWCNT ribbons are stabilized through more fa…
Eleven different cyanobacteria were investigated with respect to their capabilities to synthesize poly-3-hydroxybutyrate [poly(3HB)] and the type of poly-beta-hydroxyalkanoic acid (PHA) synthase accounting for the synthesis of this polyester. Several methods, including (i) Southern blot analysis using a phaC-specific…
A theoretical approach is adopted in this paper based on the existing literature in order to present an explicit relationship between the strengths of fibers and yarns. This provides a relatively simple method for quick estimation of staple yarn strength, while avoiding some limitations of an empirical method. The CV…
Abstract In an attempt to obtain solidified ionic liquids a cholesterol-based gelator has been applied to gelation of these liquids. By addition of a small amount of low molecular-weight gelator 1, ionic liquids such as N,N′-dialkyl-substituted imidazolium ions and N-alkyl pyridinium ions are easily gelated to give th…
In this article we report on the fabrication of 100 nm pitch gratings over a large area (∼10 cm2) using a simple, low-cost, fast process. This method includes (1) generation of the grating pattern using interferometric lithography and spatial frequency doubling and (2) pattern replication using nanoimprint lithography…
Two-dimensional periodic structures were fabricated upon a fluorine-doped SiO(2) film in which the fluorine content changed gradually in the direction of film thickness. The films were deposited by plasma-enhanced chemical-vapor deposition. The film was periodically patterned into a 1-mum period and an ~1-mum -groove…
Open reading frame YJL071W of Saccharomyces cerevisiae was shown to be ARG2 and identified as the structural gene for acetylglutamate synthase, first step in arginine biosynthesis. The three Ascomycete acetylglutamate synthases characterized to date appear homologous, but unlike the other enzymes of the yeast arginine…
An artifical seed crystal material consisting of calcium silicate hydrate (5CaO x 6SiO2 x 5H2O : tobermorite crystals) applicable for phosphorus removal by crystallization was developed. Card-house shaped tobermorite crystals were developed on the seed material where orthophosphate crystallized as a calcium phosphate.…