Materials Literature
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Low temperature (<270 °C) plasma enhanced chemical vapor deposition (PECVD) of SiO2 thin films using tetraethylorthosilicate (TEOS) and O2 plasma was investigated. Depositions were carried out in a PECVD reactor with a helical resonator discharge source. Transmission infrared spectroscopy, spectroscopic ellipso…
The atomic structures of 25° and 45° asymmetric [001] tilt boundaries in SrTiO3 have been determined experimentally using the unique combination of high-resolution Z-contrast imaging and simultaneous electron-energy-loss spectroscopy in the scanning transmission electron microscope. These complementary techniques perm…
The aim of this investigation is the evaluation of DNA interaction of with tetraruthenated porphyrin (TRP) and of DNA damage in the presence of light. Direct-fluorescence and electronic absorption measurements after incubation of DNA with TRP indicate strong binding between pBR322 DNA or calf thymus DNA with the modif…
The present work was initiated in order to obtain a better understanding of the nucleation mechanism of cube oriented grains during recrystallisation of hot deformed aluminium. Investigations included: the stability aspect of cube oriented grains during deformation, a characterisation of cube oriented areas in the as…
This work presents an exhaustive mathematical model for the high pressure polymerization of ethylene in tubular reactors of configuration similar to that encountered in the industry. Multiple injection of monomer, mixtures of initiators and chain transfer agents are considered together with realistic flux configuratio…
Oxidation of the heteropolyanion [Mn4II(H2O)2(PW9O34)2]10− (0) with potassium persulphate yielded mixed valence MnII,III products reproducibly isolated as the green potassium salt of [Mn4(H2O)2(PW9O34)2]9− (1) and the brown potassium-caesium salt of [Mn4(OH)2(PW9O34)2]9− (2). Coulometric and single crystal X-ray struc…
To investigate in vitro platelet adhesion to hydrogels, using electron-beam irradiation, polymer reaction, and radical polymerization, hydrogels were synthesized to have a wide range of water content. The nonionic synthesized hydrogels include polyacrylamide (PAAm), poly(vinyl alcohol) (PVA), poly(ethylene glycol) (PE…
This study reports our first-year experience in the immunocytochemical staining of specimens prepared by the ThinPrep processor. The avidin-biotin-complex technique was applied to smears of 70 cytological specimens, including fine-needle aspiration samples from various sites (56 specimens), body fluids (13 specimens)…
Composite electrodes for solid oxide fuel cells were modeled by three‐dimensional resistor networks. The networks were generated on a computer by identifying neighbors in either cubic lattices randomly occupied by electrolyte or electrode particles, or in random packings generated by sequential deposition of such part…
Abstract The cure kinetics of an unsaturated polyester resin were studied by differential scanning calorimetry (DSC), and different dynamic and isothermal procedures were compared. It was established that the isothermal kinetic analysis through the isoconversional adjustment ln t = A + E/RT is the method that offers t…
The shrinkage rates of small prismatic dislocation loops introduced by high-temperature plastic deformation in 9·4 and 18 mol% Y2O3-stabilized cubic ZrO2 single crystals have been determined via sequential observation of thin transmission electron microscopy foils annealed ex situ between 1100 and 1300°C. The shrinkag…
One‐step post‐polymerization‐functionalization of polythiophene is reported. Using the new method presented here a large variety of amines carrying, for example, sterically demanding or electronically sensitive functional groups can be attached to conducting‐polymer‐modified electrodes even under aqueous conditions. T…
The cylindrical pore structure and barrier layer of anodic films formed on magnesium which are similar to the Keller's model of anodic alumina are determined by direct cross‐sectional observation. The ratios of cell diameter and barrier layer thickness to the forming voltage are notably smaller than those associated w…
A study is made of a glass/glass‐ceramic bilayer as a model homogeneous/heterogeneous laminate. The underlying objective is microstructural design of ceramic layer systems with optimum mechanical properties, alternating hard layers, for wear resistance, with tough layers, for fracture resistance. Mica flakes in the gl…
Development of a coating material for shell eggs is important because of economic loss from shell damage and decline in interior egg quality. Studies were done to evaluate the interior quality (moisture loss, Haugh unit, and pH) and shell properties (strength, thickness, morphology, and color) of uncoated eggs and egg…
The objective of this study is to develop improved procedures for characterizing amorphous carbon films. Raman spectroscopy is used to characterize amorphous carbon thin films grown by pulsed laser deposition at temperatures between 293 and 873 K. The amount of bond-angle disorder is shown to decrease with increasing…
Several methods of chemical analysis, for example various redox titrations and thermogravimetric approaches, have been adapted to establish the oxygen content in superconducting cuprates and to determine the higher oxidation states of copper and other mixed-valent metals. The present review discusses and complements t…
The collapse transition of a single polymer chain in two and three dimensions was studied using the bond-fluctuation model. The obtained exponents ν of the scaling law 〈S2N〉∼N2ν agree with values proposed in the literature as well as above, at and below the Θ-temperature TΘ. Transition curves and scaling analysis plot…
Crystals of ribonuclease from Streptomyces aureofaciens diffract to atomic resolution at room temperature. Using synchrotron radiation and an imaging-plate scanner, X-ray data have been recorded to 1.20 A resolution from a crystal of native enzyme and to 1.15 A from a crystal of a complex with guanosine-2'-monophospha…
Abstract The main objective of this study was to show that an efficient removal of residual monomers is very important for in situ compatibilization of immiscible polymer blends by one step reactive extrusion. One‐step reactive extrusion means that when compatibilizing two immiscible polymers with one polymer containi…