Materials Literature
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Remanence properties and magnetization reversal mechanism of Fe nanowire arrays with diameters 16 nm and 130 nm are studied. Isothermal remanent magnetization curves show that the contribution of irreversible magnetization decreases when the diameter changes from 16 nm to 130 nm. The remanence coercivities of these na…
Corrosion behaviour of iron and mild steel in organic acid solutions has attracted the attention of several investigators 1-3 . Corrosion studies on metals in organic acid solutions are scarce in comparison with similar studies in mineral acids 4-7 . Mild steel is used for fabrication of reaction vessels, storage tank…
The practical difficulties encountered in analyzing the kinetics of new reactions are considered from the viewpoint of the capabilities of state-of-the-art high-throughput systems. There are three problems. The first problem is that of model selection, i.e., choosing the correct reaction rate law. The second problem i…
Abstract The non‐isothermal crystallization kinetics of pure polyamide 1010 (PA1010) and PA1010/montmorillonite nanocomposite (PA1010/MMT) was investigated by differential scanning calorimetry (DSC) at various cooling rates. The Avrami analysis modified by Jeziorny and a new method developed by Mo can describe the non…
Mechanical tensile and impact toughness tests and critical pitting corrosion temperature (CPT) tests were performed on samples of Duplok 27, a P/M-HIP duplex stainless steel containing copper, after heat treatments simulating industrial heat treatments of large components. It was shown that copper alloying has positiv…
Sulfonated aluminum phthalocyanines interact with cytochrome c forming complexes in aqueous solutions. The binding of these dyes was probed using fluorescence techniques (steady-state spectroscopy and time-correlated single photon counting), which enable the calculation of the equilibrium binding constants. The fluore…
We prepared iron-impregnated silica films, which turned out to be very efficient catalysts for carbon nanotube synthesis, by a sol-gel process starting from the mixture of tetraethyl orthosilicate (TEOS), aqueous solution of iron nitrate (Fe(NO3)3⋅9H2O), and ethanol. The Fe/silicate-composite catalyst films consisted…
The chemical solution deposition (CSD) technique as a highly flexible method for the fabrication of electronic oxide thin films is reviewed. Various chemical aspects of different approaches are discussed, including sol–gel, hybrid, and metallo-organic decomposition (MOD) routes, which all have been successfully applie…
This study proposes an improvement of the general formalism for calculating gamma-ray buildup factors in multilayer shields developed by Assad et al. The main modification concerns the treatment of the double-layer shield formed by the two first layers of a multilayer shield. Instead of replacing the double-layer shie…
The diatom Brachysira gravida Shayler & Siver sp. nov. is described from an oligotrophic, acidic, freshwater lake in the Ocala National Forest in north-central Florida, U.S.A. The richness of Brachysira was previously investigated to reveal that the genus is both abundant and morphologically diverse in this region of…
Nanostructured NiZn-ferrites were synthesized using a low-temperature co-precipitation method within the reverse micelles of ternary CTAB/1-hexanol/water microemulsions. The influence of pH on the precipitation reaction was investigated. It was found that a higher pH resulted in more crystalline particles. Subsequent…
We investigated the effect of Co stearate as a new reducing agent, with SiO/sub 2/ and CaO additives, on the magnetic and physical properties of SrFe/sub 2/ W-type hexagonal ferrite. We found that the magnetic properties of SrO/spl middot/8.5Fe/sub 2/O/sub 3/ were considerably improved by adding 0.3 wt% of Co stearate…
Field electron emission properties were investigated for nitrogen-doped nanocrystalline diamond films grown on Si substrates from CH4/Ar/N2 gas mixtures by direct current arc plasma chemical vapor deposition (CVD). Different nitrogen content in the gas mixtures and different deposition temperatures were used for the g…
Previous numerical investigations of model silica have shown evidence favouring liquid–liquid phase separation in the deeply supercooled liquid. This thermodynamic instability is argued to be responsible for the polyamorphic behaviour in the glass. In these previous investigations, a method for discerning local densit…
The microhardness ( H ) of single crystal, orthorhombic mullite was measured on (010) and (001) faces from room temperature up to 1400°C. The microhardness versus temperature curves display sigmoidal shapes. The mean microhardness at room temperature is ∼16 Gpa and it decreases with temperature to H is ∼ 13 GPa at 300…
Abstract In this paper, we advocate the use of the Tunnelling global optimization method for phase stability analysis and for multiphase equilibria calculations. The method had been successfully used for solving a variety of phase-equilibrium problems. The Tunnelling method has two steps. First, a minimum (which may n…
The Saccharomyces cerevisiae Tmt1 gene product is the yeast homologue of the Escherichia coli enzyme that catalyzes the methyl esterification of trans-aconitate, a thermodynamically favored isomer of cis-aconitate and an inhibitor of the citric acid cycle. It has been proposed that methylation may attenuate trans-acon…
Abstract In order to improve the stretchability of linear low density polyethylene (LLDPE) for double bubble tubular film (DBTF), the blending of LLDPEs have been investigated. Three LLDPEs of varying densities were blended, and several films having different densities, molecular-weight distributions and composition d…
Nanodispersed metallic clusters of platinum and palladium were incorporated into NaX zeolite cavities by impregnation with acetone solution of corresponding acetylacetonates, solvent evaporation and acetylacetonate thermal decomposition. The acetylacetonate decomposition was followed by thermogravimetry. Modified zeol…
Crevice corrosion on Type 316L (UNS S31603) stainless steel in alkaline chloride solutions was studied by galvanostatic polarization of an occluded specimen with a polytetrafluoro-ethylene (PTFE) crevice former. It is shown that it is possible for crevice corrosion to propagate in such solutions, even at pH > 1…