Materials Literature
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Perovskite oxides , [ and , ] containing A site defects were studied by thermal analysis, measuring of the temperature dependence of electrical conductivity (373–1273 K) and x‐ray diffraction. The results showed that underwent a phase transition accompanied by oxygen desorption at about 1000 K in air. The electrical c…
The synthesis of new zirconium and hafnium bisporphyrinate double deckers M(P) 2 (MZr, Hf; POEP, TPP) 2,3) is described. The complexes are characterized by UV/Vis/NIR and 1 H‐NMR spectroscopy and cyclic voltammetry. As compared with MCe, the redox potentials or the energies of the nearinfrared absorption bands of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(carbosilane) precursors of silicon carbide: the effect of cross-linking on ceramic residueBruno Boury, Robert J. P. Corriu, and William E. DouglasCite this: Chem. Mater. 1991, 3, 3, 487–489Publication Date (Print):May 1, 1991Publication History Published online1 May 200…
Single crystals of the reduced niobate Ba2Nb15O32 are produced by heating NbO2 in BaO·3B2O3 under high-vacuum conditions. The borate acts both as a source of BaO and as a flux for crystallization. The compound Ba2Nb15O32 crystallizes in space group R3 (a = 7.777 (1) Å, c = 35.518 (6) Å) and contains isolated [Nb6O12]O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegregation of low molecular weight symmetric diblock copolymers at the interface of high molecular weight homopolymersPeter F. Green and Thomas P. RussellCite this: Macromolecules 1991, 24, 10, 2931–2935Publication Date (Print):May 1, 1991Publication History Published onlin…
Two distinct types of fumarase were purified to homogeneity from aerobically grown Escherichia coli W cells. The amino acid sequences of their NH2-terminals suggest that the two enzymes are the products of the fumA gene (FUMA) and fumC gene (FUMC), respectively. FUMA was separated from FUMC by chromatography on a Q-Se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBenzoannelated centropolyquinanes. Part IX. Synthesis and conformational behavior of fenestrindans (tetrabenzo[5.5.5.5]fenestranes) with four bridgehead substituentsDietmar Kuck, Andreas Schuster, and Ralph A. KrauseCite this: J. Org. Chem. 1991, 56, 11, 3472–3475Publication…
The preparation of several amorphous calcium aluminate compositions by the sol‐gel procedure is reported. Although a broad composition range of amorphous gels could be prepared, they invariably crystallized when heated to sufficiently high temperatures. The crystallization behavior of bulk samples and thin gel films o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of needlelike crystals (whiskers) of poly(6-hydroxy-2-naphthoic acid)G. Schwarz and Hans R. KricheldorfCite this: Macromolecules 1991, 24, 10, 2829–2833Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissu…
The slip systems and plastic properties of normal and transition hexagonal metals are briefly reviewed. In the case of titanium, there is strong evidence that the core of screw dislocations has a sessile three-dimensional configuration, so that the lattice friction on screw dislocations governs the low-temperature pla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation behavior of styrene-isoprene diblock copolymers: bulk systemsMing Long Yao, Hiroshi Watanabe, Keiichiro Adachi, and Tadao KotakaCite this: Macromolecules 1991, 24, 10, 2955–2962Publication Date (Print):May 1, 1991Publication History Published online1 Ma…
Abstract The objective of this paper is to develop the analytical background for test methodologies that will enable accurate prediction of the strength distribution of ceramic tubular components from the strength distributions of simple specimens. Four simple specimen configurations and two tubular configurations wer…
The present paper gives evidence for the replacement of oxygen by nitrogen when partially stabilized tetragonal zirconia is reacted with nitrogen above 1400°C to give a tetragonal product but in the t ′ (nontransformable) form. No transformation toughening is therefore expected from this nitrogencontaining tetragonal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoelectron spectroscopy of copper oxide (CuO-)Mark L. Polak, Mary K. Gilles, Joe Ho, and W. C. LinebergerCite this: J. Phys. Chem. 1991, 95, 9, 3460–3463Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZirconium and hafnium polyhydrides. Preparation and characterization of M2H3(BH4)5(PMe3)2, MH(BH4)3(dmpe), and MH2(BH4)2(dmpe)2John E. Gozum and Gregory S. GirolamiCite this: J. Am. Chem. Soc. 1991, 113, 10, 3829–3837Publication Date (Print):May 1, 1991Publication History Pu…
Abstract Uniform submicron crystals of B 4 C, boron‐enriched boron carbide, and B 4 C/TiB 2 composite powders have been synthesized continuously by rapid carbothermal reduction at approximately 2,200 K in a 0.14 m ID × 1.68 m long pilot‐scale graphite transport reactor. A unique reactor design allowed for continuous f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(furfuryl alcohol)-derived carbon molecular sieves: dependence of adsorptive properties on carbonization temperature, time, and poly(ethylene glycol) additivesDavid S. Lafyatis, Jeannie Tung, and Henry C. FoleyCite this: Ind. Eng. Chem. Res. 1991, 30, 5, 865–873Publicati…
Biosynthetic thiolase from Zoogloea ramigera was inactivated with a mechanism-based inactivator, 3-pentynoyl-S-pantetheine-11-pivalate (3-pentynoyl-SPP) where K1 = 1.25 mM and kinact = 0.26 min-1, 2,3-pentadienoyl-SPP obtained from nonenzymatic rearrangement of 3-pentynoyl-SPP where K1 = 1.54 mM and kinact = 1.9 min-1…
The electro-optic effect associated with the helix distortion of chiral smectic C (SmC*) liquid crystals and its application to light modulation are investigated. Optically and electrically addressed spatial light modulators based on this effect are demonstrated. They exhibit an analog response, response times as shor…
The witA gene located between pss and rrnG on the Escherichia coli chromosome encodes a 432-amino acid protein. It is homologous to a human hepatoma glucose transporter and to E. coli membrane proteins that transport citrate (CitA), arabinose (AraE), and xylose (XylE), and, like these carrier proteins, WitA also conta…