Materials Literature
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The photocatalytic degradation of lissamine fast yellow has been carried out in the aqueous suspension of ZnO under artificial light. The effects of process parameters such as catalyst loading, H 2 O 2 , FeCl 3 , etc., on the extent of degradation have been studied. The influence of pH, bubbling of N 2 and O 2 and tem…
The corrosion loss of mild steel in the marine tidal zone varies considerably with elevation relative to mean tide. Classical studies on steel piles and electrically isolated coupons show quite different vertical corrosion profiles. This usually is attributed to the effect of differential aeration. In many practical a…
Diatoms are photosynthetic unicellular eukaryotes found in most aquatic environments. They are major players in global biogeochemical cycles, and generate as much oxygen through photosynthesis as terrestrial rainforests do. Insights into their evolutionary origins have been revealed by the whole-genome sequencing of T…
Abstract Ethylbenzene (EB) films prepared on cold metal substrates by vapor deposition in vacuum show a curious light scattering in the supercooled liquid (SCL) state when the temperature is raised at a constant rate. To investigate the cause of this phenomenon, we examined the behavior of similarly prepared samples o…
Thin polycrystalline aluminum (1050 and 6061-T6 alloys) samples were shocked to 4 GPa to examine elastic wave attenuation not observed in thicker samples (1–10 mm). Using laser interferometry in plate impact experiments, particle velocity histories were obtained for 0.08–1 mm thick samples, thinned from bulk material.…
When a thin film that is prepared in a step form on a substrate and coated uniformly with a reflective material is illuminated by a parallel coherent beam of monochromatic light, the Fresnel diffraction fringes are formed on a screen perpendicular to the reflected beam. The visibility of the fringes depends on film th…
Several enriched continuum mechanics theories have been proposed by the scientific community in order to develop models capable of describing microstructural effects. The aim of the present paper is to revisit and compare two of these models, whose common denominator is the use of fractional calculus operators. The fo…
We report three heptanuclear [Ni7] complexes with planar disc-like cores, akin to double-bowl metallocalix[6]arenes, which form molecular H-bonded host cavities.
As-doped ZnO films were grown by the radio frequency magnetron sputtering method. As the substrate temperature during growth was raised above ∼400 °C, the films changed from n type to p type. Hole concentration and mobility of ∼6×1017 cm−3 and ∼6 cm2 V−1 s−1 were achieved. The ZnO films were studied by secondary ion m…
. The EPR parameters of a series of dinuclear manganese(III,IV) complexes with mono(μ-oxo), bis(μ-oxo), (μ-oxo)(μ-carboxylato), bis(μ-oxo)(μ-carboxylato), and (μ-oxo)bis(μ-carboxylato) bridges were studied by broken-symmetry density functional (DFT) methods. The influence of the exchange-correlation functional on the…
In this feature article we focus on the key problem of charge separation in nano-scale photovoltaic materials; in particular recent theoretical/computational work based on first principles electronic structure approaches is presented and discussed. We review applications of state-of-the-art electronic structure calcul…
We have studied the temperature dependence of the visible fluorescence lines of 250 nm large PbF2 nanocrystals codoped with Er3+ and Yb3+ ions. By gluing such a particle at the end of a sharp atomic force microscope tip, we have developed a scanning thermal microscope able to observe the heating of electrically excite…
Abstract The K-Ar dating of glauconite has been used as an important stratigraphic tool for many decades. The application of this technique is limited to pure glauconites, free of detrital contamination by K-bearing phases, often not easy to detect. This study extends the application of isotope dating to the contamina…
High Mg-content, wurtzite MgZnO films were grown on sapphire (0001) substrates by pulsed laser deposition. It was found that the compositions, defect states, optical, and electrical properties of MgZnO films depend critically on the substrate temperature and oxygen pressure. As the substrate temperature increases, Mg…
As turfeiras são ambientes especiais para estudos relacionados com a dinâmica da matéria orgânica, evolução das paisagens, mudanças climáticas e ciclos de poluição atmosférica locais, regionais e globais. Elas contribuem para o sequestro global de carbono, funcionam como reservatórios de água e constituem o ambiente d…
The use of field portable X-ray fluorescence (XRF) spectrometry as a quantification tool for gypsum content in soils of West Texas and southern New Mexico, USA, was evaluated. Six sites were evaluated with gypsum contents ranging from less than 10% to greater than 90%. Samples collected from each site were scanned in…
Abstract The objective of this study was to design new, functional, nanostructured materials from the abundant clay mineral kaolinite, in spite of development problems with the interlayer chemistry of kaolinite because of its non-swelling properties. A particular goal of this work was to graft, in a controlled way, al…
The atomic-scale interactions of H atoms with hydrogenated amorphous carbon (a-C:H) films were identified using molecular dynamics (MD) simulations and experiments based on surface characterization tools. Realistic a-C:H films developed using MD simulations were impinged with H atoms with a kinetic energy correspondin…
We have investigated how the exchange bias and coercive field of NiFe/BiFeO3 bilayers on (001)SrTiO3 is affected by changes in substrate temperature, oxygen pressure, and film thickness for BiFeO3 deposition. Our results suggest that the exchange bias and the coercive field are mainly dependent on the roughness at the…
The thermal stability of p-type Ba8Ga16Ge30 clathrates grown from gallium flux has been tested by heat treatment in low pressure Ar atmosphere at 400, 600, and 800 °C. Significant gallium loss was observed for all samples during heat treatment. The treatment at 400 °C does not significantly change the sample propertie…