Materials Literature
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Studies of the mechanisms by which cerium dioxide enhances automotive catalyst performance would be facilitated by the use of pure, high‐surface‐area forms of cerium dioxide. A cerium dioxide powder with a BET area of 50 m 2 ·g −1 has been prepared by spray drying an aqueous solution of cerium nitrate, citric acid, an…
We conducted comparative studies on the chemical and mineralogical properties of selected pedons of Spodosols (Placorthods) and Andisols (Fulviudands and Melanudands) derived from Towada-a ash of 1000 B.P. and Chuseri ash of 5000 B.P., Spodosols and Fulviudands of the climosequence showed most remarkable differences i…
Abstract This study examines the effects of crystallinity and temperature on the mechanical properties of PEEK. Crystallinity in PEEK Increases with annealing temperature up to a maximum of 28 percent with a melting point at 335°C. A minor melting peak also occurs about 10°C above the annealing temperature. In cold dr…
The gases released by surface flashovers on alumina ceramics, glass, and quartz, using 20-μs voltage pulses, were investigated using an ion-pumped metal vacuum system. Appreciable quantities of gas were measured (approximately 10−6 Torr liter or 1013 molecules). The composition of this gas differed significantly from…
Abstract The title charge-transfer complex is prepared and its crystal structure is determined (BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene). One third of the BEDT-TTF molecules is incorporated in the anion sheet, and holds about 2+ charge. The remaining donors form a conducting sheet with a similar arrangement to…
We present the synthesis of 2-substituted hydroquinone-bisbenzoates which have large 2-substituents containing aromatic and other ring systems. Contrary to the general accepted opinion these large lateral substituents which cause remarkable deviations from the rod-like shape of the molecules do not prevent the liquid-…
Abstract A nuclear magnetic resonance investigation of the solid zinc chalcogenides ZnX (X = O, S, Se, Te) is carried out, using the following nuclei as probes, 67 Zn, 17 O, 33 S, 77 Se, and 125 Te. The spectra yield nuclear quadrupole coupling constants and chemical‐shift parameters for polycrystalline ZnO and Zns in…
The polymer analogous synthesis of new liquid-crystalline side-chain polymers having polystyrene and poly-α-methylstyrene backbones bearing pendant azo-benzene mesogenic groups is described. The effects of various spacer lengths on the mesophase types were examined. Several liquid-crystalline copolymers were also prep…
Abstract In this study, a theoretical basis for the use of conductive composites was established. A percolation simulation program was used to determine critical area fractions for dispersions of rectangles in two dimensions. Both the aspect ratio and orientations of the rectangles were varied independently, and the s…
A wide variety of thermodynamic, kinetic, and spectroscopic studies have demonstrated differences between the two metal-binding sites of transferrin. In the present investigation, we have further assessed these differences with respect to the binding of gadolinium, evaluated by UV difference spectrophotometry, electro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrofibrillar network of a rigid rod polymer. 1. Visualization by electron microscopyYachin Cohen and Edwin L. ThomasCite this: Macromolecules 1988, 21, 2, 433–435Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published inissue 1 Febr…
Thin films of Corning 7059, glass doped with CdS (2%–4% by weight) microcrystallites, with diameters presumably larger than 6 nm, were fabricated using rf sputtering technique. Sharp optical cutoff near 500 nm is visible on the absorption spectra of the films. Both Raman and absorption spectra presumably reveal the pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMobility and the distribution of free volume in epoxy network by photochromic labeling and probe studiesWei Ching Yu and Chong Sook Paik SungCite this: Macromolecules 1988, 21, 2, 365–371Publication Date (Print):February 1, 1988Publication History Published online1 May 2002P…
Corrosion of Si 3 N 4 under thin films of Na 2 CO 3 was investigated at 1000°C. Pure Si 3 N 4 and Si 3 N 4 with various additives were examined. Thermogravimetric analysis and morphology observations lead to the following detailed reaction mechanism: (I) decomposition of Na 2 CO 3 and formation of Na 2 SiO 3 , (II) ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAM1 parameters for zincMichael J. S. Dewar and Kenneth M. MerzCite this: Organometallics 1988, 7, 2, 522–524Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published inissue 1 February 1988https://pubs.acs.org/doi/10.1021/om00092a044htt…
The corrosion mechanism of Si 3 N 4 + Na 2 SO 4 /O 2 at 1000°C was investigated. Corrosion of both pure and additive‐containing Si 3 N 4 was studied. The reaction of Si 3 N 4 + Na 2 SO 4 consists of an initial period of slow weight loss due to Na 2 SO 4 vaporization and oxidation‐dissolution. This initial period was t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeometry of porphyrin-porphyrin interactionsPhilip Leighton, J. A. Cowan, Raymond J. Abraham, and Jeremy K. M. SandersCite this: J. Org. Chem. 1988, 53, 4, 733–740Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published inissue 1 Febru…
It is generally accepted that in the absence of oxygen corrosion of metals occurs largely due to microbial activity. Sulphate‐reducing bacteria are identified as the single most common causative microorganism responsible for the corrosion process under anaerobic conditions. They are believed to influence the overall p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray structures and far-infrared and Raman spectra of tetrahedral thiophenolato and selenophenolato complexes of zinc(II) and cadmium(II)Norikazu Ueyama, Takashi Sugawara, Kazuko Sasaki, Akira Nakamura, Shinsuke Yamashita, Yasuo Wakatsuki, Hiroshi Yamazaki, and Noritake Yas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure, magnetic properties, and orbital interactions of the [(.mu.-terephthalato)(ethylenediamine)diaquocopper(II)] zigzag chainEvangelos G. Bakalbassis, Anastasios P. Bozopoulos, Jerzy Mrozinski, Panayotis J. Rentzeperis, and Constantinos A. TsipisCite this: Ino…