Materials Literature
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The accuracy and precision of quantitative energy-dispersive x-ray spectrometry in the environmental scanning electron microscope have been estimated using a series of copper / gold alloys of known composition. The mean values (five to six replicate experiments) had relative errors within +/- 5%, and most were within…
This article presents an approach to analyzing the peel behavior of pressure-sensitive adhesives (PSAs) using the finite element method. The rheological properties and the peel strength of four natural-rubber–based PSAs were experimentally measured to provide input for and comparison with the finite element modeling.…
Microcellular processing techniques have been applied at an experimental level to both extrusion and injection moulding plastics processing, using wood fibre as reinforcing filler. The focus of the current research is the investigations of these processes using chemical foaming agents and comparative studies of physic…
The flexural, shear and tensile modulus of high density polyethylene structural foams were measured in order to determine the effect of skin thickness on their response under load. Data for foam density between 424 and 725 kg/m 3 and skin thickness between 3 and 57% are compared with different models taken from the li…
The sintering and the crystallization of two iron‐rich glass compositions (45–75‐μm powder fractions) were studied in air and nitrogen atmospheres. The phase formation was evaluated by differential thermal analysis, while the densification, by dilatometry; the crystalline phases were identified by X‐ray diffraction an…
Eleven new species of the diatom genus Gomphonema are described from brown-water habitats in Tasmania, Australia. These species are endemic to individual habitats or suites of systems, and most are known only from Tasmania. Although many of the Tasmanian species are morphologically similar to others from that island,…
Interfacial reaction kinetics between Ag and ceramic‐filled glass (CFG) substrate, containing borosilicate glass, high‐silica glass, and alumina, has been investigated at 850°–925°C in different atmospheres. No chemical reaction at the interface of Ag/CFG is found when firing takes place in N 2 or N 2 + 1% H 2 . Fired…
Rapid uptake of intravenously injected liposomes by the mononuclear phagocyte system has limited their use as drug delivery vehicles. Recently, various long-circulating liposomes have been prepared by incorporating glycolipids or other amphiphilic molecules into the lipid bilayer of conventional liposomes. The purpose…
The new mineral lindbergite, Mn(C 2 O 4 )·2H 2 O, is a secondary mineral in the Lavra da Boca Rica granite pegmatite, Sapucaia do Norte, Galiléia Co., Minas Gerais, Brazil. It occurs as: (1) white short prismatic crystals 0.1 to 0.3 mm in length, interpreted as pseudomorphs after the orthorhombic trihydrate, with face…
Piezochromic phenomena are explained by pressure perturbation to the HOMO and/or LUMO energy levels of the related electronic transition. The piezochromism of solid inorganic and organic materials has been investigated by examination of the phase transition phenomena. Specific electronic properties of the solids, acqu…
Textured bismuth titanate ceramics were successfully produced using spark plasma sintering and platelike bismuth titanate particles prepared using a molten‐salt method. The microstructure and dielectric properties of the samples were investigated. The results showed that the dielectric property of the textured bismuth…
Abstract A microscopic surface analytical technique is desirable for detailed studies of environmental and geochemical surface processes because most of the relevant solid components from natural sources are heterogeneous and have intricate microstructures. Recent advances in XPS instrumentation have allowed chemical…
The crystallization mechanism of α‐cordierite from a B 2 O 3 ‐ and TiO 2 ‐containing glass submitted to fast heating in the cordierite primary phase field of the CaO–MgO–Al 2 O 3 –SiO 2 quaternary system was investigated. Addition of B 2 O 3 to a SiO 2 ‐rich glass suppressed the formation of μ‐cordierite. This suppres…
Stable and metastable pitting corrosion of Ti was investigated in neutral and acidic halide solutions. In agreement with earlier findings by others, Br− were found to be significantly more aggressive in triggering pitting corrosion of Ti than Cl−. In Br−-containing solutions, the major factors influencing the occurren…
Plasma protein adsorption patterns on surfaces may give vital information to evaluate biocompatibility of biomaterials designed for direct blood-contacting applications or tissue integration. Adsorption of human serum proteins on four different types of biomaterials (glass, aminosilanized glass, hyaluronan and sulfate…
The crotonase homolog, 6-oxo camphor hydrolase (OCH), catalyzes the desymmetrization of bicyclic beta-diketones to optically active keto acids via an enzymatic retro-Claisen reaction, resulting in the cleavage of a carbon-carbon bond. We have previously reported the structure of OCH (Whittingham, J. L., Turkenburg, J.…
Quantitative analysis method for the calculation of three-dimensional (3D) orientation of poly(trimethylene terephthalate) (PTT) with polarized FTIR-ATR spectroscopy has been discussed. To experimentally obtain a set of four ATR infrared spectra required for 3D orientation analysis, it is necessary to rotate a sample…
A method for thin-film deposition has been studied. The method is based on metal sputtering in a hollow cathode configuration with supply of a reactive gas in the vicinity of the substrate. The working gas and entrained sputtered atoms exit the cathode through an elongated slot. The reactive gas is thereby largely pre…
We propose an input-dependent shape function for the stop model to remove its property of equal vertical chords regardless of dc bias. We compare several identification methods for the stop model and show that the input-dependent shape function improves the ability to represent the stop model effectively. A least-squa…
Thermal elasticity and electrical resistivity with the magnetic phase transition were studied in FeRh alloy films prepared by ion-beam sputtering and subjected to post-annealing. Fe/sub 49.7/Rh/sub 50.3/ and Fe/sub 48.9/Rh/sub 51.1/ films deposited on conventional glass substrate and subjected to post-annealing at 600…