Materials Literature
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A new compound of formula [Cu 2 L 2 ][tcnq] 3 has been obtained where L 2 is the Robson-type binucleating macrocyclic dianionic ligand obtained by condensation of 1,3-diaminopropane and 2,6-diformyl-4-trifluoromethylphenol and tcnq is tetracyanoquinodimethane. A comparison of the spectroscopic, conducting and magnetic…
Hydrolytically unstable d 3 [Mn IV (CN) 6 ] 2- as the [N(PPh 3 ) 2 ] + salt is crystallographically, spectroscopically, and magnetically characterized.
The presence of copper and vanadium in ceria at different concentrations gives solids with different characteristics which vary with calcination temperature. At low copper and vanadium concentrations, only the CeO2 phase is formed. When the concentration of copper is relatively high compared to vanadium, a CuO phase a…
Adsorption of polyethylenimine (PEI) of different sizes on swollen delignified pulp fibers indicates that for PEI molecules of diameter smaller than 25 nm, the accessible internal surface area within the pores in the cell wall is independent of the size of the PEI molecule. This suggests that a minimum pore radius R.…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Fine-Powder Polycrystalline Bi−Se−Te, Bi−Sb−Te, and Bi−Sb−Se−Te AlloysJoseph J. Ritter and Pichai MaruthamuthuView Author Information Ceramics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 Cite this: Inorg. Chem. 1997, 36, 2…
As W-type hexagonal ferrite permanent magnets with the formula SrO⋅2FeO⋅8Fe2O3 contain both ferrous and ferric oxides, a complicated atmosphere control during the sintering process is necessary in manufacturing, which is impractical for industrial production. Thus, a simple manufacturing method which is characterized…
Abstract X‐ray powder diffraction data were obtained for Cu 3 In 5 Se 9 and Cu 3 Te 9 , which were found to crystallize in orthorhombic and tetragonal systems, respectively. The electrical resistivities and Hall mobilities of these compounds were investigated in the temperature range 35–475 K. Cu 3 In 5 Se 9 , was ide…
We have investigated the effect of low-molecular mass species on the space charge behavior such as space charge distribution and electrical conduction of LDPE (low density polyethylene). We also attempted to explain the relationship between the space charge distribution and electrical conduction. The heterocharge, con…
The effects of solvents on the surface properties of oxygen plasma-treated polyethylene and polypropylene films have been studied by ESCA, contact angle measurement, and adhesion testing. The results show that oxygen plasma treatment produces some low molecular weight materials (LMWM) on the treated surfaces, which ca…
A poly(amic acid) (PAA) was prepared by ring-opening polyaddition of 4, 4′-hexafluoroisopropyridenebis(phthalic anhydride) and 1, 3-bis(4-aminophenoxy)benzene. The PAA film was very soluble to a tetramethylammonium hydroxide (TMAH) aqueous solution, whereas the dissolution inhibitor, 2, 3, 4-tris(1-oxo-2-diazonaphthoq…
Capillary bonding of wet solids through a water film is common and important for a variety of problems. An existing experimental technique for the measurement of capillary bonding forces was improved and used to show how fractional wetted area and capillary bonding force vary with water 'tension' for glass, polyethyle…
Some cetyltrialkylammonium tribromide salts have been studied in the solid phase using Raman spectroscopy and energy dispersive X-ray diffraction. The first technique detected the presence of asymmetric tribromides while the latter technique revealed the degree of asymmetry of the tribromide units (difference in the b…
Experimental evidence indicates that a large percentage of the crack development and subsequent fragmentation and heave in the blasting process is due to the effects of the high pressure gas generated by the explosive in the blasthole. An explicit finite/discrete element code has been developed to dynamically model st…
The structural properties of three-dimensional ordered phases of ${\mathrm{C}}_{3}$B and ${\mathrm{C}}_{5}$B compounds were studied using the ab initio pseudopotential method. Two different stacking sequences, BC and BB, of graphite layers were considered. Results indicate that for ${\mathrm{C}}_{3}$B, the structure w…
In order to clarify the reason for the excellent corrosion resistance of zinc-plated steel coated with magnesium which was electrodeposited from a molten salt, corrosion products in a 5 mass%NaCl aqueous solution were investigated by X-ray diffraction analysis and EPMA. It was found that thin MgO layer was rapidly for…
This paper focuses on the switching surge duties imposed on capacitors and air-cored reactors which are used in single-tuned filters at arc furnace installations. Switching surge studies are often necessary to fully rate these components. Rating guidelines are provided. An example compares conventional filter designs…
Al alloys 2024, 6061 and 7075 have been anodized in H 2 SO 4 solutions of two different concentrations and sealed in either boiling water or solutions of nickel acetate, cerium acetate or yttrium acetate at two different temperatures. The same aluminum alloys were anodized in Boeing's Boric-Sulfuric Acid Anodizing (BS…
Die-upset experiments on hot compacted commercial melt-spun powders MQP-A and MQP-B were carried out under an argon atmosphere at 500 to 800/spl deg/C with strain rates of 10/sup -4/ to 10/sup -1/ s/sup -1/. The kinetic analysis of the strain-rate stress relations yields the following dependences for the strain rate:…
The surface-enhanced Raman spectroscopy (SERS) of γ-aminobutyric acid (GABA) adsorbed on silver colloids in H2O and D2O were recorded and analyzed. When the concentration is greater than 10−3 M, the adsorbed species is the anionic form of the amino acid that interacts with the surface through both functional groups. A…
We have performed experiments to elucidate the mechanism of photosensitivity in rare-earth-doped fluorozirconate (ZBLAN) glasses. Glasses doped with Ce, Tb, Tm, and Pr were studied. Permanent holographic gratings were written in bulk samples using 248 nm light, with the strongest gratings observed in Ce:ZBLAN. Ultravi…