Materials Literature
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Abstract A theoritical model of the production of open‐cell microcellular foam is presented. This model allows the prediction of the conditions necessary to produce these materials. Experiments verify the model quite well. The results of the batch processing experiments indicate the processing parameters that promote…
Abstract The application of carbon-silica dual phase fillers (CSDPF) to natural rubber compound was investigated. It was found that these new fillers give significantly better overall performances in comparison with the conventional fillers—carbon black and silica. In a typical truck-tread compound, due to its high po…
Optical properties of Yb3+–Tb3+ codoped silica sol-gel samples have been studied after the gel to glass transition. Different upconversion emissions have been observed under near infrared excitation at about 1 μm. The Tb3+ ions are excited by means of energy transfer processes from Yb3+ ions. The temporal evolution of…
The luminescence lifetimes of An(III) and Ln(III) ions [An=Am and Cm; Ln=Nd, Sm, Eu, Tb and Dy] were measured in dimethyl sulfoxide(DMSO), N,N-dimethylformamide(DMF), methanol(MeOH), water and their perdeuterated solvents. Nonradiative decay rates of the ions were in the order of H 2 O > MeOH > DMF > DMSO, in…
The structural and electrical characteristics of a thermally grown gallium oxide on GaN films were investigated. A furnace oxidation at 850 °C for 12 h resulted in the formation of monoclinic β-Ga2O3, 88 nm in thickness. From the I–V measurements of the metal–oxide–semiconductor (MOS) structure, the breakdown field st…
We report the first experimental results on the temperature dependent in-plane and cross-plane thermal conductivities of a symmetrically strained Si/Ge superlattice and a Ge quantum-dot superlattice measured by the two-wire 3 omega method. The measured thermal conductivity values are highly anisotropic and are signifi…
A simple one-dimensional continuum model for electromigration transport has been fairly successful as a tool for understanding many empirical observations of electromigration phenomena in encapsulated interconnect lines on integrated circuits. In this paper, the development of the one-dimensional continuum electromigr…
To resolve relationships between members of the family Thermomonosporaceae, phylogenetic analyses using three sets of nucleotide sequences from 16S rDNA, 23S rDNA and the 16S-23S internal transcribed spacer (ITS) were carried out. Nearly all species of the family were included in this study. On the basis of congruous…
Photoinduced effects on the charge- and orbital-ordered (CO/OO) states in a layered perovskite manganite ${\mathrm{La}}_{0.5}{\mathrm{Sr}}_{1.5}{\mathrm{MnO}}_{4}$ have been investigated with femtosecond polarization-sensitive pump-probe spectroscopy. Disappearance of the optical birefringence as well as conspicuous c…
Polarized photoluminescence in orientated thin films of π-conjugated oligomers is demonstrated here. Vapor-deposited thiophene/p-phenylene co-oligomers are described and it is shown that these molecules form epitaxial needle-like crystals (see Figure). Molecular modification of the co-oligomers enables the emission co…
A comprehensive model has been developed for simulating the rates of general corrosion of selected metals in aqueous solutions. The model consists of a thermophysical and an electrochemical module. The thermophysical module is used to calculate the speciation of aqueous solutions and to obtain concentrations, activiti…
Crystallization and oxidation are usually considered as a consequence of cooling and emplacement of a magma, whereas little is known about crystallization upon reheating. However, the common eruption of basalt on the Earth and other rocky planetary bodies results in reheating at the interface. To explore the range of…
Fimbriae or pili are long, filamentous, multimeric macromolecules found on the bacterial cell surface. Bacteria express a diverse array of fimbriae or pili that are involved in bacterial adherence and invasion. Fimbriae can be categorized based on their modes of expression and assembly. Type I fimbriae and P pili are…
Chemical reactivity descriptors are computed by the use of three alternative approaches derived within the framework of density functional theory. These schemes consider the computation of orbital Fukui indices, where all valence orbitals are taken into account; the Fukui indices of each atom in the molecule from the…
Abstract Accelerated aging experiments were carried out on a natural rubber vulcanizate exposed to air and to seawater. Failure strain, shown to correlate well with the fatigue lifetime, was used to monitor the extent of degradation. The effect of temperature on the rate of aging followed an Arrhenius law, with activa…
A mixture of metallic vanadium, tungsten and molybdenum powder was dissolved in a hydrogen peroxide solution, to yield a polyvanadate sol containing W and Mo. A thin film of V 1- x - y W x Mo y O 2 was fabricated on a fused silica substrate by spin-coating using such a sol followed by reduction in hydrogen and success…
This study involves research on possible relationships between the composition of ethylene/norbornene copolymers and their thermal properties. The copolymers were fully characterised by differential scanning calorimetry (DSC), 13C NMR spectroscopy, Fourier transformation infra-red (FTIR) and Raman spectroscopy. The re…
Abstract A finite‐mode probability density function method was used with a computational fluid dynamics code to model the semibatch precipitation of barium sulfate from aqueous solutions of barium chloride and sodium sulfate in a Taylor‐Couette reactor. It was simulated in turbulent flow at high Taylor numbers under t…
This paper concerns the new results obtained on the characterization of chitins and chitosans. Large series of samples was analyzed covering a wide range of water soluble and insoluble materials. The water soluble polymers were obtained by heterogeneous deacetylation and by homogeneous reacetylation. The calibration o…
A novel organic/inorganic nanocomposite of polyethylene (PE) was prepared via in-situ coordination polymerization. The Ziegler-Natta catalyst was first supported on the surface of silicate nanowhiskers to subsequently initiate the polymerization of ethylene on the surface of these nanowhiskers. The nanowhiskers were e…