Materials Literature
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Spherical lanthanum aluminate powders approximately 1 μm in diameter were produced using spray pyrolysis techniques. These materials were characterized by X‐ray diffractometry and scanning electron microscopy. Two intermediate products were produced and identified as lanthanum oxide and aluminum oxide. These intermedi…
Infrared laser pumping of Tm:LiYF4 at low temperatures on a transition between excited states leads to strong visible and ultraviolet fluorescence. These effects are believed to arise from a multistep process. In the first step photon avalanche excitation creates a population of Tm3+ ions in states near 15 000 cm−1 an…
We have investigated the effects of reactive and organofunctional silicone softeners and silane coupling agents on the performance properties of cotton fabrics. The silicone softeners were aminofunctional polydimethylsiloxane, reactive polydimethylsiloxane of high viscosity, and hydroxy-end-blocked reactive polydimeth…
We demonstrate that the addition of small amounts of a novel azo-dye to a ferroelectric liquid crystal and illumination with low intensity (∼ 0.8 mW cm−2) UV light can result in reversible, isothermal phase transitions and dramatic changes in the properties of the system. In particular we examine light induced transit…
The release of toluene diisocyanate derivatives from polyurethane foam covers that were removed from the Même breast implant was studied. The polyurethane foam covers as retrieved from the implants were contaminated on average with 2,4- and 2,6-toluene diamine (TDA), 2,4- and 2,6-toluene diisocyanate (TDI), and toluen…
Abstract Model compounds for imines formed during the thermal curing of short chain polyimides have been synthesized and characterized. These compounds have imine bonds (CN) formed by the nucleophilic attack of primary amines on imide carbonyls. The CN stretching mode appears at 1649–1664 cm −1 in the Raman and infr…
Abstract Consideration of XRD, TEM, AEM, and analytical data reported in the literature indicates that dioctahedral aluminous smectite and illite form two separate solid solutions that differ chemically from one another primarily by the extent of Al substitution for Si, the amount of interlayer K, and the presence of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the ligand-field strength on the radiative properties of the ligand-localized 3.pi..pi.* state of rhodium complexes with 1,10-phenanthroline: proposed role of dd statesHisayuki Miki, Masashi Shimada, Tohru Azumi, J. A. Brozik, and G. A. CrosbyCite this: J. Phys. Ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on interactions of isocyanide with transition metal complexes. 36. Synthesis and characterization of a binuclear palladium(I) complex with bridging .eta.3-indenyl ligands, Pd2(.mu.-.eta.3-indenyl)2(isocyanide)2, and its transformation to a tetranuclear palladium(I) c…
Abstract Blends of ethylene methyl acrylate (EMA) and poly(dimethylsiloxane) rubber (PDMS) are demonstrated to be miscible. The miscibility results in a single and composition‐dependent glass transition temperature. IR spectra of the blends provide direct evidence of chemical reaction between EMA and PDMS rubber.
Frequency upconversion characteristics in Er3+- or Tm3+-ion-activated and Yb3+-ion- sensitized luminescent materials have been investigated. The principal goal was to obtain high-brightness, blue and green light sources under 980 nm emitting laser diode light excitation. Processes leading to the efficient upconversion…
Mineral modes have been determined for specimens of eight rock types from CuKα X-ray powder diffraction data using the Rietveld method. The samples include two granites, a granodiorite, adamellite, gabbro, basalt, trachyte, and two granulite-facies metamorphic rocks. Up to eight individual mineral components have been…
Recent sonochemical studies have revealed that active oxygen species are formed by pyrolysis of water molecules due to high temperature cavitation bubbles. When aqueous solutions of DNA were sonicated, single-strand breaks and double-strand breaks of DNA were observed. Formation of double-strand breaks due to mechanic…
Abstract Mixed addenda heteropolyoxometalate, NPV6Mo6, was found to be an efficient catalyst for the oxidative dehydrogenation of a variety of benzylic amines to the corresponding Schiff-base imines with molecular oxygen in toluene solution. Under the same reaction conditions, isochroman and indan were respectively ox…
Abstract— A new low‐image‐lag drive method is proposed for large‐size LCTVs, taking into account the input signal and inter‐field differential signal dependence of the response time. It was shown that the gray‐level response time was 30–60 ms, which is 2–3 times as long as the ON‐OFF bi‐level response time, and was ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterligand carbon-carbon .sigma.-bond breaking and repair in a "stapled" bis(phthalocyaninato)titanium complex. Synthesis, characterization, and electrical conductivity properties of oxidation products of bis(phthalocyaninato)titanium(IV) and bis(phthalocyaninato)tin(IV) an…
Sapphire fibers with (near) c ‐axis orientation were tested in tension over a range of strain rates (10 −5 to 0.5 min −1 ) at elevated temperatures (800° to 1500°C). The strength of the fibers was dependent on the strain rate. Slow crack growth was confirmed as the degradation process by direct inspection of the fract…
Vertical cutaneous extensibility was studied before and after 1, 2, 5 and 10 min hydration by application of tap water. After hydration, we noted an increase in all rheological parameters linked to elasticity whereas viscosity and hysteresis parameters were unmodified. These modifications took place from the first min…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe role of trimethylsilyl chloride in Gilman cuprate 1,4-addition reactionsBruce H. Lipshutz, Stuart H. Dimock, and Brian JamesCite this: J. Am. Chem. Soc. 1993, 115, 20, 9283–9284Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear and dinuclear ruthenium complexes containing the LRu(acac) fragment. Crystal structures of [LRuIII(acac)(OH)]PF6.cntdot.H2O, [{LRuIII(acac)}2(.mu.-O2H3)](PF6)3, and [{LRuIII(acac)}2(.mu.-O)](PF6)2. Characterization of the mixed-valence species [{LRu(acac)}2(.mu.-…