Materials Literature
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Abstract The effect of CO 2 on the nonisothermal crystallization of isotactic polypropylene (iPP) was studied with high‐pressure differential scanning calorimetry at cooling rates of 0.2–5 °C/min. CO 2 significantly delayed the melt crystallization of iPP, and both the crystallization temperature and the heat of cryst…
We confirm by Monte Carlo simulations of a Lebwohl-Lasher lattice spin model the existence of a biaxially ordered nonbent structure in a liquid-crystalline cell subject to opposing boundary conditions. We report on the observation of the bending transition from the biaxial to the bent-director structure when the tempe…
A nonthermal plasma process (dielectric-packed bed reactor) was combined with catalyst to remove nitrogen oxides (NO x ). Two different honeycomb catalysts such as V 2 O 5 /TiO 2 and Cr 2 O 3 /TiO 2 were compared with respect to the removal characteristic of NO x . The effect of oxygen content, water vapor, feed gas f…
Abstract Changes in the lamellar and crystalline structures were followed as a function of applied stress to understand the influence of the interactions between the crystalline and amorphous domains on the fiber properties. We observed a reversible transformation from a structure giving a four‐point small‐angle patte…
Electrically conducting redox-active particles were synthesized by coating near-monodisperse, micrometer-sized polystyrene latex particles (1.62 μm diameter) with polyaniline at 0 °C. This low-temperature synthesis route ensured that high-quality polyaniline was produced. The purified particles were dispersed in an aq…
Inclusion complexation of beta-chitin with linear aliphatic amines was studied by X-ray diffraction. All tested amines, C3 to C8 monoamines and C2 to C7 diamines with terminal amino groups, reversibly formed crystalline complexes with beta-chitin by immersion of dry chitin in pure liquid. Complex formation caused line…
In this paper, we set forth a general theoretical framework to predict the nanoelectromechanical behavior of polyelectrolyte brushes and then apply it to a model system of negatively charged chondroitin sulfate glycosaminoglycan (CS-GAG) chains. We used a Poisson−Boltzmann (PB) based approach to calculate the electros…
An intracellular 3-hydroxybutyrate (3HB)-oligomer hydrolase (PhaZ2(Reu)) of Ralstonia eutropha was purified from Escherichia coli harboring a plasmid containing phaZ2(Reu). The purified enzyme hydrolyzed linear and cyclic 3HB-oligomers. Although it did not degrade crystalline poly(3-hydroxybutyrate) (PHB), the purifie…
We report scanning tunneling microscopy of semiconductor-semiconductor carbon nanotube junctions with different band gaps. Characteristic features of the wave functions at different energy levels, such as a localized defect state, are clearly exhibited in the atomically resolved scanning tunneling spectroscopy. The pe…
Nanoporous poly(cyclohexylethylene) (PCHE) monoliths were prepared from ordered poly(cyclohexylethylene)−polylactide (PCHE−PLA) diblock copolymers. The copolymers were prepared by first the catalytic hydrogenation of hydroxyl end-functionalized polystyrene (PSOH) giving hydroxyl end-functionalized PCHEOH. The hydroxyl…
We have investigated the effect of reducing the thickness of strontium bismuth tantalate film to as low as 25 nm on its ferroelectric characteristics. A degradation of ferroelectric properties such as significant reduction in remanent polarization is generally observed with reduction in film thickness, in particular b…
<italic>Magnetochemistry</italic> provides an introduction to this area of study, which is the study of the magnetic properties of materials. Magnetochemistry is of central importance in the study of transition-metal complexes, providing information on the chemical bonding in these molecules. This text provides an int…
A relatively large laboratory-scale sample of a commercial type of PVC material usually used in building, flooring, home furnishings, clothing, etc., is thermally decomposed under carefully controlled conditions. Dehydrochlorination of PVC material at high temperature (up to 600 °C) has been studied. The results show…
Thermoelectric power generation has the potential to recover a large amount of energy loss at the vapor condensers in the steam-based power plants. A suitable arrangement of thermoelectric modules was designed from the heat transfer theory in the cylindrical heat exchanger. Even under the practical operation limits, 1…
Failure modes of electrospun polymer nanofibers are reported. The nanofibers have diameters in the range of 80–400 nm and lengths greater then several centimeters. The nanofibers fail by a multiple necking mechanism, sometimes followed by the development of a fibriliar structure. This phenomenon is attributed to a str…
Composites were prepared by using carbon nanotubes (CNTs) and methyl-ethyl methacrylate copolymer, modified with nonionic surfactant to improve the carbon nanotube dispersion and workability. The thermal results show that the polymer glass transition temperature increases up to 10°C and that only 1wt% CNT content impr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic Oxides of Main Group and Transition Elements Downsizing Inorganic Solids to Small Molecular FragmentsHerbert W. Roesky, Ionel Haiduc, and Narayan S. HosmaneView Author Information Institut für Anorganische Chemie, Universität Göttingen, Tammannstrasse 4, D-370…
In this letter, the role of amorphous Si clusters in the excitation of Er implanted in substoichiometric SiOx films will be elucidated. It will be shown that the temperature of the SiOx thermal process prior to Er implantation is crucial in determining the luminescence properties of the samples. In particular, the lum…
FeTaN/TaN/FeTaN sandwich films, FeTaN/TaN and TaN/FeTaN bilayers were synthesized by using RF magnetron sputtering. The magnetic properties, crystalline structures, microstructures and surface morphologies of the as-deposited samples were characterized using angle-resolved M-H loop tracer, VSM, XRD, TEM, AES and AFM.…
A fractional reaction-diffusion equation is derived from a continuous time random walk model when the transport is dispersive. The exit from the encounter distance, which is described by the algebraic waiting time distribution of jump motion, interferes with the reaction at the encounter distance. Therefore, the react…