Materials Literature
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Poly-β-hydroxybutyrate biosynthesis was studied in Alcaligenes eutrophus under various nutrient-limiting conditions. When the cells were cultivated in nitrogen-limited media, both the levels of NAD(P)H and the ratios of NAD(P)H/NAD(P) were higher than those under nitrogen-sufficient conditions. The specific poly-β-hyd…
Abstract Previous studies on one soil showed that silicone polymer (polydimethylsiloxane, or PDMS) degrades to dimethyl-silanediol (DMSD). This study examines PDMS degradation on seven U.S. soils differing in pH, % organic matter, texture, mineralogy, and geographic origin. Moist soils were amended with 350-centistoke…
Incorporation of La 3+ into the BaTiO 3 lattice was studied on samples of various composition, using quantitative WDS microanalysis (EPMA) in combination with scanning electron microscopy (SEM) and X‐ray powder diffractometry (XRPD). Direct determination of solid‐solution formulas by microanalysis supports the structu…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
The growth of single crystal β‐silicon nitride fibers (see Figure) several millimeters long through the application of self‐propagating high‐temperature synthesis is demonstrated. Advantages include the igh purity of the fibers obtained, the fact that the fibers are stable up to 2000°C, and the low cost of the SHS pro…
Abstract Fixed‐bed reactors with periodic flow reversal are used to carry out reactions with low exothermicity in an autothermal way. Contrary to conventional autothermal reactors, the preheating of the feed gas is accomplished by regenerative heat exchange between the gas and fixed bed. The feedback of heat and direc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMechanistic Role of H2O and the Ligand in the Chemical Vapor Deposition of Cu, Cu2O, CuO, and Cu3N from Bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)copper(II)Jiri Pinkas, John C. Huffman, David V. Baxter, Malcolm H. Chisholm, and Kenneth G. CaultonCite this: Chem. Mater. 1995,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(alkyl thiophene-3-carboxylates). Synthesis and Characterization of Polythiophenes with a Carbonyl Group Directly Attached to the RingMartin Pomerantz, Hui Yang, and Yang ChengCite this: Macromolecules 1995, 28, 17, 5706–5708Publication Date (Print):August 1, 1995Publica…
Abstract The two types of highly-ordered oligo(3-hexylthiophene)s in head-to-head orientation, a series of α,ω-disubstituted oligothiophenes and a series of bis(dicyanomethylene)oligothienoquinonoids, were synthesized. The properties of these compounds are discussed on the basis of the electronic spectra and cyclic vo…
Abstract Binary blends of a reactive ethylene‐based terpolymer with polybutylene terephthalate (PBT) and with a liquid crystalline polyester (LCP) were studied to clarify the possible interactions between the blended polymers. The aim was to determine the suitability of the reactive terpolymer containing epoxy reactiv…
Limited information is available on inherent stabilities of four-chain-coils. We have developed a model system to study this folding motif using synthetic peptides derived from sequences contained in the tetramerization domain of Lac repressor. These peptides are tetrameric as judged by both gel filtration and sedimen…
An extension to the peaklist optimization procedure is proposed, in which one overall phase refinement cycle consists of tangent expansion, E-map, peaksearch and elimination of peaks to achieve a maximum correlation coefficient between E o and E c . This procedure appears to be able to solve large structures from rand…
Abstract An electroactive material with remarkable solubility, processibility as well as mechanical properties has been developed by complexation (thermal doping) of polyaniline (PANi) emeraldine base with dodecylbenzenesulfonic acid (DBSA) in the solid state. Isothermal treatment of such a mixture was found to promot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetranuclear Pentaammineruthenium Complexes Bridged by .pi.-Conjugated Tetracyano Ligands Related to TCNE: Syntheses and Spectroscopy of Different Oxidation StatesMichael Moscherosch, Eberhard Waldhoer, Herbert Binder, Wolfgang Kaim, and Jan FiedlerCite this: Inorg. Chem. 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic Viscoelastic Modulus of Associative Polymer Networks: Off-Lattice Simulations, Theory and Comparison to ExperimentsRobert D. Groot and Wim G. M. AgterofCite this: Macromolecules 1995, 28, 18, 6284–6295Publication Date (Print):August 1, 1995Publication History Publish…
A series of complexes Ru(CΞCC6H4R-4)(PR'3)2(η5-C5H5) (R = H, R' = Ph, 1a; R = H, R' = Me, 1b; R = NO2, R' = Ph, 2a; R = NO2, R' = Me, 2b) has been synthesized by reaction of RuCl(PR'3)2(η-C5H5) with 4-HCΞCC6H4R and deprotonation of the intermediate metal vinylidene complex. The complexes are of the donor-acceptor type…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Mechanics for Coordination Complexes: The Impact of Adding d-Electron Stabilization EnergiesVeronica J. Burton, Robert J. Deeth, Christopher M. Kemp, and Phillip J. GilbertCite this: J. Am. Chem. Soc. 1995, 117, 32, 8407–8415Publication Date (Print):August 1, 1995P…
The nucleation of a lamellar phase from a supercooled homogeneous phase in a fluctuation-driven first-order transition is studied, based on a phenomenological free energy due to Brazovskii (Zh. Eksp. Teor. Fiz. 68, 175 (1975) [Sov. Phys. JETP 41, 85 (1975)]). The absence of phase coexistence in the corresponding mean-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State 17O Magic-Angle and Dynamic-Angle Spinning NMR Study of the SiO2 Polymorph CoesiteP. J. Grandinetti, J. H. Baltisberger, I. Farnan, J. F. Stebbins, U. Werner, and A. PinesCite this: J. Phys. Chem. 1995, 99, 32, 12341–12348Publication Date (Print):August 1, 1995Pu…
Visible electroluminescence (EL) has been reported from semitransparent Au film/extra thin Si-rich silicon oxide film/p-Si diodes at room temperature. The Si-rich silicon oxide films, with thickness of about 40 Å, were grown using the magnetron sputtering technique. At forward bias of 4 V, EL spectra with peak energy…