Materials Literature
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The doping–undoping properties of polypyrrole films electropolymerized under ultrasonication were investigated. p -Toluenesulfonate-doped polypyrrole film prepared with ultrasonication exhibited a more negative cathodic peak than that prepared without ultrasonication in the cyclic voltammograms. This voltammetric chan…
The electrochemical oxidation of dense Mn films is shown to occur through the following sequence of oxides: Mn to MnO to Mn 3 O 4 to Mn 2 O 3 to MnO 2 . X-ray photoelectron spectroscopy analysis reveals that at each stage, the manganese exists as a hydrated compound. Complete oxidation was shown to be necessary to mai…
Titanium oxides of different surface areas were sulfated then calcined to convert the solid to a strong acid. The amount of sulfur retained by the solid and the thermal stability of the resulting sulfate are controlled by the dispersion of the initial oxide. The acid properties were determined by gravimetry at 383 K,…
Abstract The tensile and stress‐relaxation properties of an uncrosslinked and a loosely silane‐crosslinked high‐density polyethylene exposed to organic “crude‐oil” penetrants were assessed. The measurements were performed on penetrant‐saturated samples, surrounded by the organic liquid throughout the experiment. The p…
We describe a model-independent evaluation of the possibility of extracting detailed lattice dynamical information from neutron powder diffraction data. The method, which we first reported recently [Phys. Rev. Lett. 93, 075502 (2004)], is extended to include consideration of crystal symmetry. This is exploited to redu…
Critical freezing of molecular rotation in an achiral smectic phase, which leads to polar ordering through the second order paraelectric-antiferroelectric $(\mathrm{Sm}\text{\ensuremath{-}}A\ensuremath{\rightarrow}\mathrm{Sm}\text{\ensuremath{-}}A{P}_{\mathrm{A}})$ phase transition is studied theoretically and experim…
Uniformly distributed ZnO nanorods with diameter 80–120 nm and length 2 µm have been grown at low temperatures on GaN by a catalyst-free and inexpensive aqueous solution method. The formation of the ZnO nanorods and the growth parameters are controlled by reactant concentration, temperature and pH. XRD and TEM studies…
A series of novel organic superstructures exhibiting diverse aggregate morphologies with liquid-crystalline-like properties were prepared by a simple precipitation method. Here, a chiral sugar moiety was simply introduced at the Schiff-based rod end of rod−coil molecules. In contrast to coil−coil molecules, the self-a…
Electrochemical impedance spectroscopy has been revealed to be a useful tool to evaluate the exposed surface area and consequently to evaluate the corrosion behavior of titanium foams intended for biomedical applications. In order to find the most accurate corrosion assessment, a new equivalent circuit involving a por…
Polyester films are modified with their bioactivity for tissue engineering by grafting a nano-structured bioactive material, nano-structured chitosan (nano-CS), on a model polymer, poly (epsilon-caprolactone) (PCL). The nano-CS was duplicated using a solvent-etched PCL mold and then grafted onto PCL using a selected s…
Patterned multilayer films composed of poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS) were prepared using dip and spin self-assembly (SA) methods. A silicon substrate was patterned with a photoresist thin film using conventional photolithography, and PAH/PSS multilayers were then deposi…
Abstract Silk fibroin films with various calcium chloride contents were prepared by a cast film method and subsequent MeOH treatment. The conformational changes from α‐helix to β‐sheet structure were analyzed by Fourier transformed infrared attenuated total reflection spectroscopy measurements. The films obtained were…
Atomic-scale microstructure changes of carbon nanotubes under high bias∕high current conditions were studied by in situ high-resolution transmission electron microscopy. We found that high bias voltage caused significant structure changes, such as crystallization and elimination of amorphous coating on the surface of…
We report the fabrication process and the electrical characteristics of a nanocapacitor structure using metal-insulator-carbon nanotube-metal layers. The structure shows high capacitance and the possibility of ultrahigh integration density due to the unique nanotube structure. Nanoscale and high-aspect-ratio patterns…
Polycrystalline Ba2MnWO6 (BMW) and Sr2MnWO6 (SMW) samples were studied between 80 and 1200 K by Raman scattering spectroscopy. In the case of BMW (space group Fmm), four Raman active vibrational modes, predicted by factor group analysis, were identified. Raman scattering studies with different wavelengths revealed a r…
The crystallization of two diblock copolymers, one forming a cylindrical mesophase and the other a spherical mesophase in which the crystallizable unit, polyethylene, is the minority component, has been followed in situ using high-temperature atomic force microscopy. Contrast is obtained between the crystallizable and…
Catalyst-doped sodium aluminum hydrides have been intensively studied as solid hydrogen carriers for onboard proton-exchange membrane (PEM) fuel cells. Although the importance of catalyst choice in enhancing kinetics for both hydrogen uptake and release of this hydride material has long been recognized, the nature of…
A series of bis(pyridyl) acceptor emitters are synthesized and the LC and photophysical (PL and EL) properties of their supramolecular structures, including H-bonded polymer networks and trimers, are explored. Unique mesomorphic properties may be introduced into these H-bonded complexes and polymers containing nonmeso…
Abstract In today's world, technology for capacitors has grown significantly with its requirements in the direction of better dielectric properties. Developing an ideal composite material (polymer and ceramic) for satisfying the processing parameters is of great interest for capacitor industry. In this study, chemical…
Electrocatalysis of a Pd–Ni/composite anode (small amounts of Pd–Ni catalyst on a lanthanum chromite-based porous composite anode) for direct oxidation of dry methane in solid oxide fuel cells (SOFCs) was studied at . Synergy of Pd and Ni catalysts was observed for the direct oxidation of dry methane. Maximum power de…