Materials Literature
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The density of brownish spots formed on the surface of silica glass through the reaction with silicon melt is studied using three types of silica glass, that are made from natural quartz powder, synthetic silica powder, and Al-doped synthetic silica powder. The density of the brownish spots was higher in natural quart…
Over the last couple of years, an increasing amount of research has been dedicated to the use of flax fibres as an environmentally friendly alternative to glass fibres in engineering composites. Because of the relatively poor thermal stability of flax fibres compared to glass fibres, knowledge of the thermal degradati…
Ruddlesden-Popper phase, La(n+1)Ni(n)O(3n+1 (n=1, 2, and infinity) compounds were prepared by citrate sol-gel method. We revealed the origin of the variation of the electrical conductivities in La(n+1)Ni(n)O(3n+1 (n=1, 2, and infinity) using resistivity measurements, Rietveld analysis, and X-ray absorption spectroscop…
A comparative study of the photodegradation of CdS nanoparticles coated with silica shells dispersed in water and embedded in two silica gels with different pore size is presented. Although encapsulation of the quantum dots in a silica shell previously was proven to provide a basically permanent protection against lig…
We present results on foaming of a thermoplastic elastomer (TPE) using water as the physical blowing agent. The TPE is a blend of polypropylene and fully crosslinked EPDM rubber made by a dynamic vulcanization process. The influence of the blowing agent content, and the processing conditions on foam density, cell nucl…
Errors in quantitative electron microprobe analysis arise from many sources including those associated with sampling, specimen preparation, instrument operation, data collection, and analysis. The relative magnitudes of some of these factors are assessed for a sample of NiAl used to demonstrate important concerns in t…
Abstract The alteration and transformation behaviour of Ceca smectite in two acid and saline solutions (NaCl and KCl) was studied in batch experiments. This type of smectite is proposed as potential backfill material for nuclear waste storage sites. The initial solution was enriched with 500 ppm of U, Th and Eu. The e…
The corrosion behavior of alloy AA5083 in aerated solutions of NaCl has been studied. Special attention has been paid to the analysis of the electrochemical response of this alloy using Electrochemical Impedance Spectroscopy (EIS). Analysis of the obtained data has enabled an evaluation of the contributions made by ea…
Soluble and cross-linked poly(maleic anhydride-co-styrene) copolymers were reacted with hydroxyl containing compounds such as salicylic acid, 2-phenyl ethanol, eugenol and paracetamole in acetone or dioxane solution at 50-80°C. The hydrolytic and controlled release behavior of the copolymers containing these compounds…
The size of poly(benzyl ether) dendrimers with different molecular architectures was measured by small angle neutron scattering (SANS). Both polar and non-polar solvents were used to measure the effect of solvent type. The radius of gyration (Rg) of all of the dendrimers follows a scaling law of Rg ∝ M1/3 consistent w…
Aromatic dicarboxylic acids, such as terephthalic (TPA) and isophthalic (IPA) acids having different structures of the activated carboxyl groups were prepared in situ by the reaction of the diacids with TsCl/DMF/Py containing various amounts of DMF. The polycondensation involved by these carboxyl groups using 0.3 equi…
Polyimides with a unique combination of properties including low colour in thin films, atomic oxygen (AO) resistance, ultra-violet (UV) radiation resistance, solubility in organic solvents in the imide form, high glass transition ( T g ) temperatures, and high thermal stability have been prepared and characterized. Po…
In the first part of this paper the results of a literature review are presented. Here we provide an overview of the materials that are suitable for long term service in oxidizing atmospheres at temperatures of 1500°C and higher. Criteria are a sufficient stability against the surrounding environment, low vapor pressu…
Methods to reveal the macrostructure of spheroidal graphite cast iron (SGI) are not available. This has caused a number of controversies involving the solidification mechanism of this metallic alloy. The objective of the present work is to examine the use of a novel technique (DAAS) reported recently, to reveal the so…
The influence of precipitates on the development of microstructure and crystallographic texture during cold rolling was investigated in particle-containing Al-Cu and Al-Mn single crystals with the initial orientations (011)[100], (011)[211] and (112)[111]. Analysis of the X-ray rolling textures yielded broad scatter o…
The corrosion behaviour of type 316 stainless steel has been investigated in F- containing dilute hydrochloric acid and acetic acid solutions aerated with oxygen gas at 25°C using electrochemical measurement techniques. Both electrochemical impedance spectroscopy spectra and polarisation curves illustrate that 316 sta…
The semiconductor-metal-semiconductor transitions in stoichiometric FeS compounds were observed under nearly hydrostatic pressure condition up to 8 GPa and a temperature down to 4 K. In the low-pressure semiconductor state, the energy gap caused by the electron correlation decreases with a volume reduction. On the oth…
The thermal expansion behaviour of silver fcc has been described by an anharmonic Einstein model using EXAFS data in the temperature range between 10 and 300 K. The linear expansion coefficient of a bulk silver foil agrees well with X-ray diffraction data. In the case of silver particles embedded in a silicate glass m…
Numerical simulations are presented that document the strong effect of a previously underappreciated portion of two‐stage thermal treatments used in the study of nucleation processes: the “heat‐up” process whereby samples are heated from “nucleation” conditions to “growth” conditions. The simulations indicate that two…
NAD+-dependent formate dehydrogenase (FDH) from Candida boidinii was cloned and expressed to a high level in Escherichia coli (20% of soluble E. coli protein). Molecular modelling studies were used to create a three-dimensional model of C. boidinii FDH, based on a known structure of the Pseudomonas sp. 101 enzyme. Thi…