Materials Literature
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Atomistic models were used to determine the properties of dislocation core fields and stacking fault fields in Al and Cu using embedded atom method (EAM) potentials. Long-range, linear elastic displacement fields due to nonlinear behaviour within dislocation cores, the core field, for relevant combinations of Shockley…
Tapered carbon nanotubes (TCNTs) are produced from activated carbon powders via simple thermal catalytic reactions in which the carbon nanotubes grow though a Sn-catalyzed vapor–liquid–solid growth process. The tapered nanotubes are well aligned and have a length of several tens of micrometers (see Figure).
A series of alkali metal azide-crown ether complexes, [Li([12]crown-4)(N3)], [Na([15]crown-5)(N3)], [Na([15]crown-5)(H2O)2]N3, [K([18]crown-6)(N3)(H2O)], [Rb([18]crown-6)(N3)(H2O)], [Cs([18]crown-6)(N3)]2, and [Cs([18]crown-6)(N3)(H2O)(MeOH)], has been synthesised. In most cases, single crystals were obtained, which a…
The inhibition of copper corrosion by benzotriazole (BTAH) has been studied by scanning electrochemical microscopy as a function of time and oxygen content. Under normal atmospheric conditions the inhibiting [Cu(I)-BTA] film was formed in approximately . When the oxygen content was lowered below , an insulating film c…
Preparation of mixed metal oxide precursors for solid oxide fuel cells represents a very complex chemical process in which a metal may form oxides, hydroxides and various complex basic salts as intermediates. A detailed study to determine the relationship between synthesis strategies, morphology, sinteractivity and SO…
Uniform, well-ordered, mesoporous organosilicate films (see Figure) have been synthesized by efficient direct and post-synthesis functionalization methods in supercritical carbon dioxide and characterized using spectroscopic, microscopy, and diffraction techniques. These materials have numerous potential applications,…
The electrical transport and chemical sensing properties of single-walled carbon nanotube field effect transistors (SWNT-FETs) coated with metal clusters have been investigated. The source-drain current passing through an SWNT-FET coated with Pd nanoparticles showed no change over a range of gate voltages. Nevertheles…
A gold nanocomposite made soluble in both water and oil by the addition of a second adsorption layer of poly-N-vinyl-2-pyrrolidone on gold nanoparticles that have been made hydrophobic, Yang, Yun, Li, Jinru, Mu, Jin, Rong, Huilin, Jiang, Long
Es wird Licht: Kohlenstoffnanoröhren aus ineinander gestapelten offenen Kegeln (SCCNTs) wurden im Gleichstromfeld aus THF-Suspension elektrophoretisch auf leitende Glaselektroden abgeschieden (siehe Bild). In diesen Filmen tritt Ladungstrennung auf, und sie liefern bei Bestrahlung mit sichtbarem Licht einen Photostrom…
Abstract Electrically conductive composites were prepared using epoxy resin (EP) as matrix and nickel‐coated polyethylene teraphthalate (PET) fibers as filler. The fibers were coated with nickel by plating and ultrasonic electroless deposition techniques. The coaxial transmission line method was used to measure the el…
We report the synthesis of well aligned, high density, vertical single-crystal ZnO nanowires on ITO-buffered Si substrate (ITO is indium tin oxide) at 550 ◦ Cf or 30 min. It was found that the average length and diameter of the ZnO nanowires were around 3.5 µ ma nd30 nm, respectively. It was also found that the ZnO na…
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,…