Materials Literature
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The dc leakage current behavior and its thickness dependence in vanadium-doped bismuth titanate thin films have been investigated over a wide range of temperatures. The leakage current behavior was explained on the basis of space-charge-limited conduction theory. The current density, calculated from the I-V characteri…
The purpose of this paper is to provide a high corrosion resistance multilayer coating on AZ91D magnesium alloy. The multilayer coating having a thickness of about 45 μm and consisting of different Ni‐P alloy layer was prepared by electroless deposition. The composition of the multilayer coating from substrate to surf…
Using computational models, we investigate how the aspect ratio of nanoparticle fillers within a polymer coating affects the ability of the film to heal nanoscale defects in the underlying substrate. We first consider the interactions between the filled polymer melt and a flat surface and show that the depletion attra…
The atmospheric corrosion of pure copper has been investigated after the deposition of sodium chloride (NaCl) particles and exposure to humid air containing gaseous pollutants. Microgravimetry, Fourier transform infrared (FTIR) microspectroscopy, and scanning electron microscopy with x-ray microanalysis were used for…
The presence of soluble organic material as well as high concentrations of suspended matter in waters and wastewaters affect the efficiency when chlorine is used as disinfection agent. The objective of our work is to explore to which extend ultrasonic treatment can facilitate wastewater disinfection with chlorine in o…
This report shows that Salmonella enterica catabolizes ethanolamine to acetyl-CoA (Ac-CoA), which enters the glyoxylate bypass and tricarboxylic acid cycle for the generation of energy and central metabolites. During growth on ethanolamine, S. enterica excreted acetate, whose recapture depended on Ac-CoA synthetase (A…
Acoustic-phonon transmission and thermal conductance in a double-bend quantum waveguide at low temperatures are investigated with the use of the scattering matrix method. The calculated results show that the total transmission coefficient versus the reduced phonon frequency exhibits a series of resonant peaks and dips…
Coplanar waveguide (CPW) metamaterials with varied left- (LH) and right-handed (RH) passbands are thoroughly studied in terms of per-unit-length transmission parameters and magnitude/phase of transmission coefficient, respectively. The two metamaterials are constructed by simultaneously loading the lumped or distribut…
Fully oxidized alpha-AlIIIW12O40(5-) (1ox), and one-electron-reduced alpha-AlIIIW12O40(6-) (1red), are well-behaved (stable and free of ion pairing) over a wide range of pH and ionic-strength values at room temperature in water. Having established this, 27Al NMR spectroscopy is used to measure rates of electron exchan…
The driver for lean NO x treatment is the need to meet regulatory standards for diesel engines and gasoline direct injection spark‐ignited engines that offer better fuel economy. Efforts over the last decade have been focused toward finding an active lean NO x catalyst that can reduce NO x under oxidizing conditions o…
Amidos de milho contendo aproximadamente 72 e 100 % de amilopectina foram convertidos em amidos termoplásticos por processamento em um misturador intensivo a 160 ºC, usando glicerol como plastificante. Os amidos termoplásticos foram condicionados em ambiente de 53 ± 2% u.r. e caracterizados por medidas de absorção de…
The case of disappearing/late-appearing stable polymorphs and their impact is well-understood by scientists in the pharmaceutical industry. This paper discusses an instance where a more stable crystal form was discovered during the development of a fast-track drug candidate. Challenges in adapting to the discovery of…
To improve the biocompatibility of silicon-based implantable micro- and nanodevices, and to tailor silicon surfaces for controlled cell immobilization, well-defined functional polymer-Si(111) hybrids, consisting of nearly monodispersed poly(2-hydroxyethyl methacrylate [P(HEMA)] with covalently coupled collagen and tet…
We constructed ultraviolet (UV) photodetectors using thin films of silicon nanoparticles as active media. The Si nanoparticle films are electrodeposited at room temperature on Si p-type substrates. Uniform silicon nanoparticles of 1-nm diameter are dispersed from Si wafers using electrochemical etching. The nanopartic…
Molecular dynamics simulations of model miscible polymer blends consisting of 1,4-polybutadiene (PBD) (slow component) and PBD chains with reduced or eliminated dihedral barriers (fast component) have been performed in order to study the influence of blending on segmental relaxation processes in the fast component. We…
Stoichiometric BaTiO3 ceramics fabricated from sol-gel-derived powders and sintered at temperatures ⩽1100°C are highly insulating and electrically homogeneous. At higher sintering temperatures, samples gradually lose oxygen and the conductivity increases as a consequence. The latter phenomena are very sensitive to the…
The coercive field $({E}_{c})$ of $\mathrm{Pb}({\mathrm{Zr}}_{0.55}{\mathrm{Ti}}_{0.45}){\mathrm{O}}_{3}$ film was experimentally observed showing a paraboliclike relationship with grain size $d$. The curvature of ${E}_{c}\ensuremath{-}d$ increased as the film thickness decreased. A phenomenological theory was develop…
The evolution of the domain structure in lead zirconate titanate ceramics in the course of polarization fatigue is investigated by piezoresponse force microscopy. It is found that fatigue results in a strong modification of the domain structure. The domain patterns initially consisting of mainly 180° domains split int…
Reduction of [(triphos)NiCl2] (1) with an excess of NaBH4 in THF produces the paramagnetic Ni(I) complex [(triphos)Ni(eta2-BH4)] (2). X-ray crystallography shows 1 to be a square-planar Ni(II) species in which the phosphine ligand is bidentate, whereas 2 has pseudotetrahedral geometry at the Ni(I) center, with a tride…
The time-dependent morphology development in a segmented polyurethane, which was prepared by the reaction of equimolar amounts of 1,4-phenylene diisocyanate ( p PDI) and poly(tetramethylene oxide)glycol of 〈 M n 〉 of 975 g/mol, was investigated. No chain extender was utilized during the synthesis, and the resultant mo…