Materials Literature
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Cocquyt, C. & Jahn, R.: Rare Surirella taxa (Bacillariophyta) from East Africa described by Otto Müller: typifications, recombinations, new names, annotations and distributions. — Willdenowia 35: 359–371. —ISSN 0511-9618; © 2005 BGBM Berlin-Dahlem. doi:10.3372/wi.35.35218 (available via http//dx.doi.org/)East African…
The properties of the luminescence pulse from collapsing laser-created bubbles in pressurized water are studied for pressures between 0.25 and 15 bars. The duration of the light pulse is found to be linear in the maximum bubble size, but for a given bubble size it increases with the applied pressure p as p0.38. The nu…
Abstract A novel method of preparation of superhydrophobic nanosilica by surface-modification in situ in aqueous solution is reported in this paper. The silica nanoparticles modified by hexamethyldisilazane show superior hydrophobic and excellent dispersive properties in organic solvents. Wettability studies show that…
In this communication, we report the self-assembly of zirconia by mixing its precursor with another solution containing surfactant as well as gelatin. The resulting zirconia product consists of many disks with a range of diameter from approximately 100 nm to approximately 2 mum. These disks can be assembled inside aqu…
Abstract The adsorption of tris(8-quinolinato)aluminum(III) (Alq3) into mesoporous silica was investigated. Alq3 was easily occluded into the mesoporous silica from Alq3 solution and the luminescence altered with respect to the amount of adsorbed Alq3. This is the first report to effectively modify the luminescence pr…
Resonant cavities have been widely used in the past to enhance material, nonlinear response. Traditional mirrors include metallic films and distributed Bragg reflectors. In this paper we propose negative index material mirrors as a third alternative. With the help of a rigorous Green function approach, we investigate…
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…