Materials Literature
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A prototype transformer has been designed and built which is novel in its combination of high voltage (50 kV), high frequency (20 kHz) and high power (25 kVA) specifications. The design technique utilized a spreadsheet approach which facilitated an iterative design procedure. The transformer used a ferrite core, nylon…
Abstract The oxidation of cyclohexane with molecular oxygen in the presence of isobutyraldehyde catalyzed by nanostructured iron and cobalt oxides and iron oxide supported on titania has been studied. Nanostructured cobalt oxide on MCM-41 is found to be efficient for catalytic aerobic epoxidation of olefins.
Polyaniline (PANI) films were prepared by electroless surface polymerization of the aniline on an aniline–silane (C6H5NHC3H6Si(OMe)3) modified (aniline primed) ITO electrode. Dense, smooth and strongly adhered films with thickness in the range of 100 nm to 1 µm were isolated. The polyaniline films deposited on aniline…
In this work, filter paper was coated with plasma depositions of hexamethyldisilazane (HMDS), and double layers of HMDS and n-hexane, and HMDS and tetraethyl orthosilicate (TEOS). In the case of double layers of HMDS and TEOS, TEOS deposition times of 2, 4 and 6 minutes were studied. The double layers were interfaced…
Electrochemical impedance spectroscopy was used in the study of lithium insertion in a film. Spectra obtained at different potentials showed the characteristic shape of a diffusion process, with a Warburg regime at high frequencies and a capacitive branch at low frequencies arising from the charge storage associated w…
Dihydrophilic block copolymers of poly(ethylene oxide)-b-polyglycidol were prepared and polyglycidol blocks converted into ionic blocks containing OP(O)(OH)2, COOH, or SO3H groups. Although phosphorylation of polyhydroxy compounds with POCl3 usually leads to insoluble products, phosphorylation of poly(ethylene oxid…
Several methods for the determination of both the surface free energy of polymer materials and the conditions necessary to perform contact angle measurements are discussed. The effects of the corona-treatment energy on the surface free energy and on the adhesion of acrylic adhesive were studied using a biaxially-orien…
YCo 4−x Fe x B compounds have been investigated by means of neutron powder diffraction. Substitution of Co with Fe causes substantial modifications of the crystal structure. Iron occupies preferentially one (2c) of the two cobalt sites (2c and 6i). The Curie temperature of the material increases with Fe content from T…
Using an improved pulsed electroacoustic system which is capable of measuring space charge distribution at minimum intervals of 25 /spl mu/s, the charge distribution inside water-treed polyethylene (PE) was examined. From the results, the frequency dependencies of conductivity and permittivity were examined for water…
Layered cobalt oxides and heavy-fermion compounds are quantitatively compared from the viewpoint of thermoelectric materials. These two systems exhibit anomalously large thermopowers with good electric conductivity, which is attributed to a strong electron-electron correlation. In certain materials the pseudogap incre…
The achiral syn conformer (face-to-face) of the ethane-bridged bis(zinc porphyrin) (syn-ZnD) transforms into the corresponding chiral extended anti bis-ligated species (anti-ZnD.L2) in the presence of enantiopure ligands (L: amino acid derivatives). The mechanism of the supramolecular chirality induction is based on c…
p-Type 6H-SiC substrates were implanted with Mn + or Fe + at doses of 3 5 × 10 16 cm − 2 under conditions that avoided amorphization (substrate temperature ∼350°C). After annealing at 700°C, the magnetic properties of the samples were examined by superconducting quantum interference device magnetometry. Both the Fe-…
Ti-modified high silica zeolite with an Si/Al ratio of 1900 was found to be effective for the oxidation of propene to oxygenates such as propene oxide, in the presence of molecular oxygen at 573 K.
Abstract The crystal structure determination of tris(vanadyl)-substituted tungstoantimonate(III) K11H[(VO)3(SbW9O33)2]·27H2O reveals that the [(VO)3(SbW9O33)2]12− anion contains three exterior VO2+ groups sandwiched by two α-B [SbW9O33]9− ligands in VIV···VIV separation of 5.411(8)-5.464(8) Å and is stabilized by equa…
The mole fraction solubility of a poorly water soluble loop diuretic, furosemide, was determined in aqueous binary mixtures of ethanol, propylene glycol, and glycerol from 0% to 100% cosolvent concentrations at 25 degrees C. Solubility predictions based on the minimum number of experimental data points were performed…
Polyoxometallates act as electon relays in a photocatalytic process that involves POM/S/Mn+ (POM = polyoxometallates PW12O403−, SiW12O404− and P2Mo18O626−; S = organic substrate and Mn+ = metal ions Ag+, Cu2+, Pd2+ and Ni2+). By a suitable choice of POM and, to a lesser extent, organic substrate, selective photocataly…
The present work describes a water/oil emulsion technique for the production of microspheres by cross-linking soluble starch with epichlorohyrin, which is a very efficient divalent cross-linking agent for starch. Because they are important features for potential applications, such as pulmonary administration, special…
The degradation process of silicone rubber was investigated by leakage current monitoring in the inclined-plane method. A data acquisition system (DAS) with 12-bit, 8-channel analog/ digital (AD) converter was prepared. The maximum erosion depth was measured for use as the degradation indicator. The result suggests th…
A model to quantify the degree of mixing in pharmaceutical powder mixing operations was developed. The additive volume mixing model is based on the determination of the characteristic volume of agitation for a given blender, which is dependent on process parameters such as the formulation ingredients, the geometry of…
Spheres, rods, and wires are the most usual morphologies of semiconductor nanoparticles. Here, in contrast, cube-shaped crystals of cadmium sulfide (e.g., see Figure) are reported. The “nanocubes” are produced on self-assembled monolayers of alkanethiolates on gold, and the size of the cubes can be controlled through…