Materials Literature
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Abstract International Standard ISO 9223-92 permits the determination of atmospheric corrosivity based on either corrosion rates determined from annual tests on several standard metals or on the time of wetness (TOW) and pollution levels of SO2 and Cl−. Experience shows that the corrosion rate is influenced by the exp…
Ultrastructural and cytochemical studies on the mineralization of enameloid were performed using Heterodontus japonicus, an elasmobranch, and Tilapia buttikoferi, a teleost as materials. The mineralization of the enameloid in the Heterodontus was divided into the following two steps: (1) initial crystallization in the…
The mixed-ligand phthalocyanine lanthanide complexes [Ln(pc)X2] [pc = phthalocyanine radical anion; Ln = Sm, Eu, Gd or Lu; X = 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dionate (fod), 1,1,1-trifluoro-4-phenylbutane-2,4-dionate (btfa) or 3-heptafluorobutyryl-D-camphorate (hfbc)] have been synthesized and charact…
The effect of initial CO2 concentraion on NO destruction and regeneration was investigated as part of our ongoing research on NO emission from CO2 recycled coal combustion, which could realize easy CO2 recovery and drastic NO reduction simultaneously. Experiments were carried out in a flat flame burner for CH4 / O2 /…
The contrast observed in the (0001) HREM images of MoS2 are interpreted with a model based on rotational moiré patterns. Computer-simulated images show that rotations of two supercells by angles of 3, 5, 8, and 16 degrees around their centers reproduce the contrast observed in the experimental images. The calculations…
The oxidation behaviour of several TiB2 cermets has been studied in air in a range of temperatures between 700 and 1000C for up to 70h. The oxidation resistance of these materials has been characterised through measurements of mass gain as a function of time and temperature. The oxidation kinetics of these cermets was…
Diffusion coefficient of carriers, D, and their mobility, μ, in disordered semiconductors at very low temperatures are temperature-independent, being determined by the energy-loss hopping of carriers through localized band-tail states. In such a hopping relaxation in a system with exponential density of tail states, t…
A set of poly(β- l -aspartate)s bearing branched alkyl side groups of varying shapes and sizes has been synthesized, and the crystal structures of these polymers have been investigated by X-ray diffraction and computational methods. The anionic ring-opening polymerization of 4-(( S )-alkoxycarbonyl)-β-lactams (the alk…
A novel route for modifying the interlayer pore structure of silica iron oxide sol particle pillared montmorillonite was proposed based on the post-intercalation of organic templates. The pristine mixed oxide sol pillared montmorillonite (SFM) was prepared by the reaction of Na-montmorillonite with silica iron sol par…
The surface chemistry, reactivity of vaterite, and its crystalline transformation in the presence of manganese(II) have been studied in ultra-pure water and at room temperature using several techniques: X-ray diffraction (XRD), scanning electron microscopy (SEM), specific area measurements (BET), infrared (IR) spectro…
The effect of vanadium and niobium on the restoration behavior after hot deformation in medium carbon spring steels was investigated by use of a thermomechanical processing simulator. It was clarified that vanadium is effective to inhibit restoration after hot deformation, because vanadium carbides and/or nitrides fin…
Shock-wave compression of poly(aminomethineimine) under a pressure of 40 GPa produced no crystalline material but amorphous carbon nitrides having microscopically different morphologies, a quasi-spherically concentric closed-shell form, a random-layer-structure and a completely amorphous structure. These have the same…
Abstract : This paper concerns itself with photo-induced anisotropy in two azobenzene functionalized polymers. A simple physical model of the process which considers only three possible states of azo chromophores is proposed. This model predicts an equilibrium level of anisotropy which depends on the pump irradiance a…
The effect of pore size on the gaseous adsorption of ethenzamide (EZ) on porous crystalline cellulose (PCC) in a mixture of PCC-EZ, and the physicochemical stability of EZ in a mixture of PCC-EZ after storage at various relative humidities (RHs) were investigated by powder X-ray diffractometry, differential scanning c…
A polarised neutron diffraction (PND) experiment on [Ru(acac)3] at 4.18 K and 5 T along the b and c axes yielded 28 and 17 flipping ratios respectively. Single-crystal X-ray structure determinations at 293, 92 and 10.5 K, together with powder neutron diffraction experiments, provided auxiliary data allowing magnetic s…
The electrochemistry of a µ-oxo dimanganese(III) octaethylporphyrin (II) and those of the corresponding mononuclear complexes MnIII(OEP)Cl (I), MnIII(OEP)ClO4 (III) and MnIII(OEP)OH (IV) (where OEP represents octaethylporphyrin) were studied. When complex II was adsorbed on an electrode and placed in aqueous acidic el…
3%Si–Fe (100)[011] single crystal was investigated to analyze its texture evolution during rolling and recrystallization. Cold rolled (100)[011] could be fully recrystallized by utilizing dynamic strain aging, and sharp recrystallized texture was obtained. Rolled texture maintained the initial orientation (100)[011] w…
Impact experiments have been performed to obtain shock compression, release response, and spall strength of two scaled concrete formulations. Wave profiles from a suite of ten experiments, with shock amplitudes of 0.08 to 0.55 GPa, focus primarily on the elastic regime. Despite considerable wave structure that develop…
Calcium carbonate has been modified with three surface modifying systems based upon stearic acid, acrylic acid and a reactive coating comprising acrylic acid with dicumyl peroxide through dry blending. Polypropylene homopolymer was compounded with the coated and uncoated fillers (0 to 65 wt%) through twin screw extrus…
Since ω-phase crystals in β-Ti alloys formed by aging become nucleation sites of α-phase crystals due to further or high temperature aging, it is thought that this phenomenon can be utilized to produce stronger and more ductile (β+α) duplex Ti alloys. In order to form high density ω-phase crystals, the effects of a st…