Materials Literature
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Species of the genus Thalassiosira are abundant in the oceanic waters south of the Antarctic Convergence Zone. Species within the genus are differentiated on the basis of arrangement and density of areolae and on type, position, and arrangement of processes. All of the Antarctic species known to us can be separated on…
X-ray photoelectron spectroscopy spectra measured on copper sulfide (CuxS) films showed that a thin surface reaction product containing Cu in the +2 valence state was formed on CuxS films exposed to air for 46 h at 40 °C and 90% relative humidity. An entirely different CuxS surface reaction product layer was formed in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWell-controlled polymerization by metalloporphyrin. Synthesis of copolymer with alternating sequence and regulated molecular weight from cyclic acid anhydride and epoxide catalyzed by the system of aluminum porphyrin coupled with quaternary organic saltTakuzo Aida, Koichi Sa…
The currents flowing from a localized corrosion site (LCS) on passive stainless steel in air‐saturated have been studied using a vibrating probe electrode. The potential behavior during applied currents was analyzed by assigning equivalent circuits to the passive surface and the localized site so that the paths of the…
Abstract Differential scanning calorimetry was used on a range of synthesized phenol–formaldehyde (PF) resols to discover relationships between formulation parameters or physical properties of resols, and their thermal behavior during cure. The thermograms showed either one or two exothermic reactions. The lower exoth…
Excitation coefficients for the production of vibrationally exicted D2 by low energy electrons have been determined from measurements of the intensity of infrared emission from mixtures of D2 and small concentrations of CO2 or CO. The measurements were made using the electron drift tube technique and covered electric…
The effect of lateral substituents on the type and thermodynamic stability of the mesophases shown by terminally polar and nonpolar rod-like mesogens is described. Lateral substituents both sterically force the interacting molecules apart and also hinder the packing of the molecules in a layered structure, thus suppre…
The nebulosities around five optically selected (by UV excess) luminous QSOs have been observed spectroscopically. 3C 273, which has been observed off-nucleus before, has nebulosity dominated by a stellar continuum. TON 202, a steep-spectrum radio source, has nebulosity dominated by strong Balmer and [O III] emission…
Abstract A range of authigenic sedimentary chlorites from sandstones has been studied by analytical transmission electron microscopy. Selected area (single crystal) electron diffraction patterns are of the I b ( β = 90°) polytype confirming the earlier observations of Hayes (1970). TEM analyses show all samples to be…
The crystal structure of cubic barium titanate was determined at five temperatures up to 180 °C, using the data collected by an X-ray automatic four-circle diffractometer. At temperatures between the Curie temperature and about 180 °C, the Ti atom is displaced from the center of the unit cell along the <111> direction…
The addition of small amounts of iron to the shape-memory alloy Ti-Ni suppresses the martensitic transition, permitting a detailed study of ``premartensitic'' effects. Using x-ray and neutron-diffraction data, specific-heat, resistivity, and susceptibility measurements, we show that two distinct phases appear. The fir…
Solid catalysts in common use are typically in the form of small metal crystallites dispersed on the internal surface of the porous support. Advantages of these supported-metal catalysts lie in their high surface-to-volume ratio and the high thermal stability endowed by the dispersion. Such catalysts are commonly prod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly amorphous, birefringent, para-linked aromatic polyamidesH. G. Rogers, Russell A. Gaudiana, W. C. Hollinsed, P. S. Kalyanaraman, J. S. Manello, C. McGowan, R. A. Minns, and R. SahatjianCite this: Macromolecules 1985, 18, 6, 1058–1068Publication Date (Print):June 1, 198…
The gene for the major phosphofructokinase enzyme in Escherichia coli, pfkA, has been sequenced. Comparison of the amino acid sequence with other phosphofructokinases showed that this enzyme is related to the Bacillus stearothermophilus and rabbit muscle enzymes, but is different from the second, minor phosphofructoki…
The three-dimensional structure of ubiquitin has been determined at 2.8 A resolution. X-ray diffraction data for the native protein and derivatives were collected with an automated diffractometer. Phases were obtained by use of a single isomorphous mercuric acetate derivative. The molecule contains a pronounced hydrop…
The oxidation and reduction of metal phthalocyanines give rise to at least six oxidation states whose electronic spectra are rationalized in some depth in terms of SCF energies, Coulomb and exchange integrals. It is shown that a single set of parameters can reproduce the Q band energies moderately well. Further this s…
Abstract Melt fabricated plastic articles with improved solvent and vapor barrier properties are of great need in the packaging industry. Various techniques, such as coextrusion, surface treatments, and coatings, are being employed currently towards this objective. Present work has identified a unique polymer blend ap…
Solid‐state 29 Si and 27 Al NMR spectra of kaolinite fired at 800° to 1450°C, interpreted in light of a newly proposed metakaolinite structure and complementary X‐ray diffraction results, lead to the following conclusions about the hightemperature reactions: (1) Removal of the final residual hydroxyl radicals of metak…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimerization of cobalt(II) tetrasulfonated phthalocyanine in water and aqueous alcoholic solutionsYu Chu Yang, J. Richard Ward, and Reginald P. SeidersCite this: Inorg. Chem. 1985, 24, 12, 1765–1769Publication Date (Print):June 1, 1985Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe melt properties of ring polystyrenesJ. RooversCite this: Macromolecules 1985, 18, 6, 1359–1361Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published inissue 1 June 1985https://pubs.acs.org/doi/10.1021/ma00148a059https://doi.org/10.10…