Materials Literature
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Bulk hydrogen retention and the analysis of absorption kinetics have been studied on graphite irradiated with neutrons at various conditions. Two kinds of hydrogen trapping sites may exist and be additionally produced during irradiation: interstitial cluster loop edge sites (trap 1) and carbon dangling bonds at edge s…
Abstract Solid-state NMR methods were used to characterize the filler distribution in rubber blends and domain size of thermoplastic vulcanizates (TPV). Correlation between filler content and magic angle spinning (MAS) 13 C and 1 H NMR signal linewidth was established, and filler content in each component of the rubbe…
Recent developments in direct injection foam processing using styrene–maleic anhydride (SMA) copolymer have resulted in a distinct and significant increase in the performance of foam packaging for food service applications. There are several problems that a consumer could experience when using a traditional polystyren…
Electron paramagnetic resonance spectroscopy is used to determine the concentration of excited (singlet) molecular oxygen photosensitized by silicon nanocrystals. The generation of singlet oxygen in the porous silicon layers is studied quantitatively at various oxygen pressures and exciting light intensities with the…
Abstract The multiaxial impact test in polymers is analyzed. The impact response of a propylene copolymer is characterized under different test conditions. Due to the nature of the impact event and to the complex material behavior, an intricate stress state is developed rendering rather difficult the assessment of the…
Abstract Surface morphology of monolayers related to solid‐state structure for methacrylate comb copolymers having fluorocarbon and hydrocarbon side‐chains was investigated by X‐ray diffraction (XRD), differential scanning calorimetry, and atomic force microscopy (AFM). From the XRD profiles, two kinds of short spacin…
Corrosion tests for copper were carried out in solutions containing various concentrations of chloride or sulfate ions under both static and flowing conditions. Pitting corrosion occurred at lower ion concentrations and was then transformed to general corrosion with increasing ion concentration. The critical ion conce…
We have observed one-dimensional (1D) superlattices at the grain boundary of highly ordered pyrolytic graphite (HOPG) with a scanning tunneling microscopy (STM). Observed 1D superlattices extend over micrometer length and have periodicities from 0.5 nm to 10 nm with a height corrugation up to 1.5 nm, due to electron d…
This article describes the coupled heat and mass (water, oil) transport phenomena in parallelepiped samples of beech (Fagus sylvatica) fried in peanut oil between 120 and 180°C. The aim was to evaluate the suitability of simultaneous fry drying and oil impregnation as an alternative wood treatment process. Water loss…
Plasma facing components (PFC) for modern steady state fusion devices have to withstand heat fluxes up to 20 MW m −2 . In case of internal defects in the components, a critical heat flux event can occur at an incident heat flux lower than expected in a defect-free component. It is therefore essential to develop in-ves…
The need to deliver ultra-low emitting vehicles at a reasonable cost is driving the automotive industry to invest significant manpower in computer aided design and optimization of exhaust treatment systems. The significant fluctuations in the stock exchange market values of the precious metals employed in the manufact…
The effect of hydrostatic pressure on chemical reactions induced by 20 kHz ultrasound has been studied using three different methods: the oxidation of potassium iodide, bubble cloud visualization studies, and sound attenuation measurements. The latter two have demonstrated that shielding of the ultrasonic wave is less…
Abstract Deformation twins in an ultrafine grained commercial Al – Mg – Si alloy with nonequilibrium grain boundaries processed by equal channel angular pressing at room temperature have been observed by means of a transmission electron microscope and a high-resolution transmission electron microscope. It was found th…
Abstract The electronic structure of WO 6 6– –Zn 2+ complex in ZnWO 4 crystal is calculated by the configuration interaction method in embedded cluster approach. The dependencies of energies of the electronic states of WO 6 6– –Zn 2+ centre on displacements of atomic coordinates that model vibrations of WO 6 6– group…
A partial crystallization field and rate study was performed for the synthesis of ferrierite from gels of variable composition: 1.85Na 2 O·Al 2 O 3 · x SiO 2 ·592H 2 O·19.7R, where R = pyrrolidine or ethylenediamine. The variables of syntheses were the SiO 2 /Al 2 O 3 molar ratio of the gel (10 < x < 25), temperature…
Abstract Emission spectra of Ho 3+ ‐doped YVO 4 crystals are studied in the visible and infrared spectral regions. Besides the emission bands at 544 nm and at about 1950 and 2017 nm due to Ho 3+ , we observed a broad emission band at 610 nm at low temperatures like 15 K in the highly doped crystals with the Ho 3+ conc…
The polycrystalline (with nanosized particles) samples of Pb(Sc0.5Nb(1−x)∕2Tax∕2)O3 (PSNT) (x=0, 0.3, 0.5, 0.7, and 1) were prepared using mechanical activation system and the mixed oxide routes. The compounds were found in rhombohedral structure with the presence of a small amount of pyrochlore phase. The changes in…
The optimized configurations, electronic structures, charge transfers, band gaps, total energies, cohesive energies, electron density maps, infrared absorption spectra, Raman spectra, and relevant modes of natural acoustic vibrations for the semiconductor clusters C 24 , B 12 N 12 , Si 12 C 12 , Zn 12 O 12 , and Ga 12…
Abstract Instrumental characterization of an adhesion interface in a rubber-brass system often faces a difficulty in exposing a clean surface due to a stick of rubber residue on a brass surface. We have succeeded in isolating an interface from the rubber matrix by inserting a filter paper between rubber and brass duri…
X-ray diffraction pattern from cotton fiber (dch32) grown in the Karnataka state of India has been recorded. Fiber was found to contain 17 Bragg reflections, of which 11 are broadened because of crystal size and intrinsic strain influences. Contributions to integrated intensities from intrinsic strain in the fiber hav…