Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute-solution chiral optical changes signal the thermally reversible gelation of poly(n-hexyl isocyanate) in hydrocarbon solventsMark M. Green, Chetan A. Khatri, Michael P. Reidy, and Kalle LevonCite this: Macromolecules 1993, 26, 17, 4723–4725Publication Date (Print):Augu…
The effect of sulfide (S2–) ions on the corrosion behavior of an austenitic steel (Uranus B6) in phosphoric acid (H3PO4) solutions was examined. The critical concentration at which the effect of S2– ions became perceptible was determined. Aggressive effects of the ions increased with increases in temperature and oxyge…
ADVERTISEMENT RETURN TO ISSUEPREVArticleA two-dimensional self-consistent-field model for grafted chains: determining the properties of grafted homopolymers in poor solventsKanglin Huang and Anna C. BalazsCite this: Macromolecules 1993, 26, 17, 4736–4738Publication Date (Print):August 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoubly-hydrated hexafluoroacetylacetone as a tetradentate ligand: synthesis, magnetochemistry, and thermal transformations of a dimanganese(III) complexElisabeth Bouwman, Kenneth G. Caulton, George Christou, Kirsten Folting, Christophe Gasser, David N. Hendrickson, John C. H…
Cadmium sulphide thin films have been deposited chemically at near room temperature in aqueous ammonia solutions using thiourea as the sulphur source. The composition of the solution was [CdSO4] = 1.4 × 10−2M, [Thiourea] = 2.8 × 10−2 M, [NH3] = 1.74 M. The structure of the layers and the growth mechanism are studied b…
„Metallautismus”︁ ‐ dieser Begriff charakterisiert treffend den Befund, daß im adamantanoiden Eisen(III)‐Chelatkomplex 1 die vier Eisenzentren weder elektronisch noch magnetisch miteinander wechselwirken. Verbunden sind die vier Metallatome über sechs Chelatliganden 2 , die durch Deprotonierung des Kondensationsproduk…
A new method for the design of antireflection coatings is described in which a linearly constrained quadratic programming optimization procedure is used to find an inhomogeneous layer solution that, for a given overall thickness of the layer, corresponds to the global optimum for the problem. The refractive-index prof…
The application of a DC electric field (poling) to a ferroelectric lead zirconate titanate (PZT) ceramic aligns domains in the field direction. The non 180°-domain switches involve mechanical deformations, which are detected as acoustic emission signals. Concurrent with AE signals, electrical current pulses arise from…
Proteolytic degradation of glutamine synthetase (GS) in Escherichia coli is known to follow "marking" by oxidative modification. At an early stage of the degradative pathway, oxidation of His 269 and Arg 344 abolishes GS enzymatic activity. We propose a mechanism for the early stage of oxidative inactivation of GS on…
AnsrnacrBernalite is a new iron hydroxide from the Proprietary mine at Broken Hill, New South Wales, Australia.The mineral occurs as flattened pyramidal to pseudo-octahedral crystals up to 3 mm on edge with concretionary goethite and coronadite.The crystals are dark bottle green, with a vitreous to adamantine luster.B…
Abstract Thermal characteristics of radiation‐grafted FEP‐g‐polystyrene copolymer films were evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The grafting of polystyrene onto FEP film introduced a two‐step degradation pattern where polystyrene degradation occurred in the ra…
The fluorescence of ${\mathrm{Pr}}^{3+}$:${\mathrm{LaCl}}_{3}$, ${\mathrm{PrCl}}_{3}$ and ${\mathrm{Nd}}^{3+}$:${\mathrm{LaCl}}_{3}$, ${\mathrm{NdCl}}_{3}$ has been measured up to pressures of 10 GPa. In addition the structural parameters of ${\mathrm{PrCl}}_{3}$ and ${\mathrm{GdCl}}_{3}$ have been obtained up to 8 GP…
The reaction of (E)-4,5-epoxy-(E)-2-heptenal with butylamine and glycine methyl ester produced brown macromolecular pigments, which showed fluorescent characteristics similar to lipofuscins. This polymerization reaction implies in the first step the formation of 1-alkyl-2-(1'-hydroxyalkyl)pyrroles (IV, VI). Compounds…
In disordered fractal or nonfractal systems, the disorder induces rapid fluctuations of the acoustical vibrational wave functions, so that statistics can be used to resolve the problem of Raman scattering from localized low-energy vibrations. We derive the expressions of light-vibration coupling coefficient, C(ω), as…
Remarkably aromatic are the diaza[26]annulenes of type 1, which are stabilized by pyrrole rings positioned at the corners. This has been proven by 1H NMR spectroscopy, crystal structure analysis, and by electrophilic substitution reactions. In contrast, for the simple annulenes (CH)n, the aromaticity “stops” at the 22…
Cristobalite is formed when borosilicate glass (Corning Code 7740) is sintered at temperatures ranging from 700 o to 1000 o C. The precipitation kinetics, determined by XRD analysis, exhibit a characteristic incubation period which decreases with increasing sintering temperature, from 60‐120 min at 700 o C to 3‐5 min…
A selective film‐formation technology using liquid‐phase deposition (LPD) around room temperature for fully planarized multilevel interconnections is developed. The LPD technique utilizes supersaturated hydrofluosilicic acid aqueous solution as a source liquid. The films can be selectively formed on chemical vapor dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and magnetic properties of a binuclear copper(II) complex with a .mu.-1,2-squarato coordination mode. Crystal structure of (.mu.-1,2-squarato)bis[(N-(2-(diethylamino)ethyl]salicylidenaminato)aquacopper(II)] hydrateC. E. Xanthopoulos, M. P. Sigalas, G. A. Katsoulos,…
Thermally stimulated depolarization current (TSDC), thermal sampling (TS) TSDC, and dielectric spectra of poly(p-phenylene sulfide) (PPS) were measured in the vicinity of the glass transition temperature Tg. The global TSDC spectra of amorphous PPS with varying the poling temperature revealed the presence of two TSDC…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble polyimides with polyalicyclic structure. 2. Polyimides from bicyclo[2.2.1]heptane-2-exo-3-exo-5-exo-6-exo-tetracarboxylic 2,3:5,6-dianhydrideMasao Yamada, Masatoshi Kusama, Toshihiko Matsumoto, and Toshikazu KurosakiCite this: Macromolecules 1993, 26, 18, 4961–4963Pu…