Materials Literature
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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.-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAramid and imidazole based polyelectrolytes: physical properties and ternary phase behavior with poly(benzobisthiazole) in methanesulfonic acidMelinda B. Gieselman and John R. ReynoldsCite this: Macromolecules 1993, 26, 21, 5633–5642Publication Date (Print):October 1, 1993Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of surface chemical groups on energetic heterogeneity of activated carbonsTeresa J. Bandosz, Jacek Jagiello, and James A. SchwarzCite this: Langmuir 1993, 9, 10, 2518–2522Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCofacial bisorganometallic diporphyrins: synthetic control in proton reduction catalysisJames P. Collman, Yunkyoung Ha, Paul S. Wagenknecht, Michel Angel Lopez, and Roger GuilardCite this: J. Am. Chem. Soc. 1993, 115, 20, 9080–9088Publication Date (Print):October 1, 1993Publ…
Abstract The blends of two different ultra high molecular weight polyethylenes (UHMWPE) and high density polyethylene (HDPE) were prepared in melt at different compositions and mixing rates in Brabender Torque Rheometer. The temperature build‐up due to the internal friction during melt blending was recorded and evalua…
We propose a new method to align liquid crystals using microgrooves that are fabricated by a stamping process. This rubless alignment method has the advantage of accurate control of the pretilt angle and azimuthal surface anchoring energy by means of changing the surface morphology. In this paper we discuss the contro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA decanuclear mixed-valent manganese complex with a high spin multiplicity in the ground stateDavid P. Goldberg, Andrea Caneschi, and Stephen J. LippardCite this: J. Am. Chem. Soc. 1993, 115, 20, 9299–9300Publication Date (Print):October 1, 1993Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of a layered molecular material comprising manganese hexafluoroacetylacetonate and nitronyl nitroxide radicalsAndrea Caneschi, Dante Gatteschi, and Roberta SessoliCite this: Inorg. Chem. 1993, 32, 21, 4612–4616Publication Date (Print):October 1, 1993Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of cesium (.mu.-oxo)bis(oxodisulfatovanadate) Cs4(VO)2O(SO4)4Kurt Nielsen, Rasmus Fehrmann, and Kim Michael EriksenCite this: Inorg. Chem. 1993, 32, 22, 4825–4828Publication Date (Print):October 1, 1993Publication History Published online1 May 2002Published…
Silver has played a critical role in the fabrication of metal/ high‐T c superconductor composites. Phase equilibrium in the binary PbO–Ag and CuO–Ag systems has been investigated using differential thermal analysis (DTA), thermogravimetry (TG), and X‐ray diffractometry (XRD) techniques. Composition versus temperature…
Abstract Emission mechanism in an aromatic polyimide, PI(BPDA/PDA), derived from biphenyltetracarboxylic dianhydride and p ‐phenylene diamine were studied with ultraviolet visible absorption and fluorescence spectra of a series of the model compounds. The excitation spectrum of the intermolecular charge‐transfer (CT)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and dynamic properties of the lanthanum(III) complex of 1,4,7,10-tetrakis(2-carbamoylethyl)-1,4,7,10-tetraazacyclododecaneJanet R. Morrow, Shahid Amin, Charles H. Lake, and Melvyn Rowen ChurchillCite this: Inorg. Chem. 1993, 32, 21, 4566–4572Publication…