Materials Literature
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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…
Composite crystals are crystals that consist of two or more subsystems, in first approximation each one having its own three-dimensional periodicity. The symmetry of these subsystems is then characterized by an ordinary space group. Due to their mutual interaction the true structure consists of a collection of incomme…
Atomistic studies of stacking faults and dislocation cores in several h.c.p. metals have been carried out using recently constructed empirical many-body potentials. These potentials are fitted so as to reproduce the correct c/a ratios and allow us to study the effect of the deviation from close packing upon the disloc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of [M(N-methylimidazole)6]S8 (M = manganese, iron, nickel, magnesium). Polysulfide salts prepared by the reaction N-methylimidazole + metal powder + sulfurSomanath Dev, Emannuel Ramli, Thomas B. Rauchfuss, and Scott R. WilsonCite this: Inorg. Chem. 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of (micro)phase separation during fast, bulk copolymerization: some synchrotron SAXS experimentsAnthony J. Ryan, Wayne R. Willkomm, Todd B. Bergstrom, Christopher W. Macosko, Jeffrey T. Koberstein, Chung Chien Yu, and Thomas P. RussellCite this: Macromolecules 1991,…
The temperature dependence of the first sharp diffraction peak (FSDP) in the neutron structure factor has been measured from room temperature to 1036 \ifmmode^\circ\else\textdegree\fi{}C. With increasing temperature, the FSDP decreases in amplitude in a normal fashion. This is in contrast to the anomalous temperature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular engineering of liquid crystalline polymers by living polymerization. 10. Influence of molecular weight on the phase transitions of poly{ι-[(4-cyano-4'-biphenylyl)oxy]alkyl vinyl ether}s with nonyl and decanyl alkyl groupsVirgil Percec and Myongsoo LeeCite this: Mac…
Abstract New transparent flexible hybrid network “ceramer” materials have been synthesized by incorporating triethoxysilane capped polytetramethylene oxide with highly reactive titanium isopropoxide or zirconium n ‐propoxide without adding chelating agents. Both of these types of ceramer materials display high transpa…