Materials Literature
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Abstract Due to the increasing use of power electronics high frequency working voltages are occurring rather frequently. This means a very high stress for any kind of insulatation. This situation is further aggravated by decreasing dimensions due to miniaturization. Therefore this situation has to be taken into accoun…
The chemiluminescence generated from the reaction of a thermally stable phenylphosphate-substituted dioxetane Lumigen PPD at ambient temperature was studied in DMSO solution. The presence of trivalent metal ions Cr(3+), Ga(3+), Fe(3+) and Al(3+) was found to quench the resulting chemiluminescence dramatically. The sys…
The temperature dependence of electrical resistivity in LaSrNiO4 ± δ ceramics synthesized using various techniques and subjected to heat treatment is studied. The occurrence of a metal-semiconductor transition is shown to be accounted for by the Anderson carrier localization originating from the random arrangement of…
The effects of nitrogen postplasma treatment on the properties of a Cu/Ta/a-C:F structure were investigated. Interface reactions between Ta and a-C:F were also examined. A strong interaction between Ta and a-C:F at the interface and defluorination of a-C:F film occurred during Ta sputter deposition. Ta fluoride was ob…
Adhesil1e support treatments for the conservation of silk artifacts were evaluated by comparing the properlies and relative light stability of silk laminates and their components. Samples were prepared by adhering silk habutae, representing the artifact, to a silk or polyester crepeline support fabric with either Appr…
The influence of commercially available inhibitors on the absorption of hydrogen by steel (St 52, StE 460, StE 690, 42CrMo4) in 15% hydrochloric acid was studied. The pickling bath aged continuously due to the chemical reaction with oxidized steel sheets. The H+- and inhibitor concentration decreased with time. The in…
Abstract Clay minerals in early Jurassic sequences of shales, siltstones and sandstones deposited in non-marine, transitional and shallow marine environments have been examined by X-ray diffraction, electron microscopy and chemical analysis to study the relationship between clay minerals, their environment of depositi…
Doping nanocrystalline silicon ( nc -Si) films grown by laser ablation with gold leads to a considerable suppression of the nonradiative recombination of the charge carriers and excitons, an increase in the intensity and stability of the visible photoluminescence, and enhancement of the low-energy (1.5–1.6 eV) photolu…
From silica precursors we synthesized silica fillers in sol-gel reaction in the carboxylated acrylonitrile/butadiene rubber (XNBR). N-2-aminoethyl-3-aminopropyl-trimethoxysilane (DAMS) and tetraethoxysilane (TEOS) were used as fillers' precursors. It has been found that DAMS is a substance crosslinking XNBR. The netwo…
Diamond is a prototype mechanical material. Its hardness is greater than that of any other material. Its shear stiffness is greater than its bulk modulus, and the latter is greater than that of any other material. Its surface energy is greater than that of any other cubic crystal. The purpose of this manuscript is to…
Sm 2 ( Fe 0.95 Cr 0.05 ) 17 N x and Sm2(Fe0.95Mn0.05)17Nx coarse powders 10–70 μm in size were synthesized by crushing mother alloy ingots into 32–74 μm in particle size and subsequent nitrogenation at 748 K in a flowing mixed gas of 60 vol % H2+40 vol % NH3. The effects of Cr or Mn substitution for Fe on the nitrogen…
The magnetic response of MgB2 samples prepared by solid state reaction method, were studied. Important features revealing the granular character of the specimens were verified, as (i) depressed magnetization versus field response, when compared with the corresponding curve for unlinked powder, (ii) the paramagnetic Me…
The dielectric properties, dielectric relaxation behavior, electric conduction and kinetic characteristics of fluorine-containing polysiloxane-imide were investigated. The fluorine-containing polyimide [6FDA + p-PDA] has a low dielectric constant of 3.04, compared to normal polyimides such as Upilex-S [BPDA + p-PDA] w…
The evolution, during laundering, of mechanical, chemical, and morphological prop erties of cellulose fibers covered with a fluorocarbon resin is studied using a combination of low frequency mechanical spectroscopy (LFMS), x-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). From this study of th…
The transport properties of Li-doped NiO and (Li + Ca)-doped NiO were investigated in the high temperature region up to 1073 K. All the oxide samples were prepared by a sol-gel method followed by a sintering procedure. The wet-chemical processing is efficient to prepare oxide ceramics due to shortening of the overall…
Perovskite‐type lanthanum iron oxide (LaFeO 3 ) powders were synthesized by glycothermal reaction at 300°C of a precursor that had been previously prepared by solvothermal decomposition of a mixture of lanthanum(III) isopropoxide and iron(III) butoxide (or methoxide) in toluene. Direct glycothermal reaction of the mix…
Abstract Bis[2-(aminomethyl)pyridine]platinum(II) chloride monohydrate [Pt(amp)2]Cl2·H2O has been found to exhibit photochromism in single-crystalline phase. Single crystals of the chloride were changed from almost colorless to pale-blue by the irradiation of the light. Its aqueous solution, however, shows no photochr…
Case histories of microbiologically influenced corrosion are presented with an emphasis on failure analysis and the techniques for diagnosing the role of fungi in the corrosion. Fungal influenced corrosion has been reported for carbon steel and aluminum fuel tanks; carbon steel cables; and painted and unpainted ship h…
Tunneling magnetoresistance (TMR) and magnetic properties of (Co/sub 50/Fe/sub 50/)/sub x/-(Al/sub 2/O/sub 3/)/sub 1-x/ granular films prepared by dual electron beam evaporation were studied. The influence of the particle size distribution (PSD) on magneto-transport properties is reported. It was found that TMR versus…
The domain pattern evolution in magnetic fields along the diagonal of a square Permalloy film element (edge length 57 /spl mu/m, thickness 207 nm) is studied theoretically and by Kerr-microscopic observation. Equilibrium configurations and magnetization curves are computed using a reduced two-dimensional model, based…