Materials Literature
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Tensile creep and creep rupture behaviors of alumina/17 vol% silicon carbide nanocomposite and monolithic alumina Were investigated at 1200° to 1300°C and at 50 to 150 MPa. Compared to the monolithic alumina, the nanocomposite exhibited excellent creep resistance. The minimum creep rate of the nanocomposite was about…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoenzymes: A Novel Class of Biological CatalystsTadhg P. BegleyCite this: Acc. Chem. Res. 1994, 27, 12, 394–401Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/ar00048a…
A stable high-copy-number plasmid pSYL105 containing the Alcaligenes eutrophus polyhydroxyalkanoic acid (PHA) biosynthesis genes was constructed. This plasmid was transferred to seven Escherichia coli strains (K12, B, W, XL1-Blue, JM109, DH5alpha, and HB101), which were subsequently compared for their ability to synth…
Raman spectroscopy was used to examine the structure of barium titanium oxide thin films grown by metal-organic chemical vapor deposition (MOCVD) and laser-assisted deposition. The spectra were compared with the spectra of a ceramic specimen and a single crystal. Raman peaks specific to the tetragonal ferroelectric ph…
The concentrations of L-aspartate, L-glutamate, L-serine, glycine and gamma-aminobutyric acid (GABA) were determined in repeated samples of ventricular CSF from five patients with severe closed head injury. The values were compared with those obtained from five subjects undergoing surgical treatment for intractable de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSegregative Crystallization of Several Diamond-like Phases from the Graphitic BC2N without an Additive at 7.7 GPaSatoshi Nakano, Minoru Akaishi, Takayoshi Sasaki, and Shinobu YamaokaCite this: Chem. Mater. 1994, 6, 12, 2246–2251Publication Date (Print):December 1, 1994Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNanophase Separation in Monodisperse Rodcoil Diblock PolymersL. H. Radzilowski and S. I. StuppCite this: Macromolecules 1994, 27, 26, 7747–7753Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio Molecular Orbital Study of Na(H2O)n (n = 1-6) Clusters and Their Ions. Comparison of Electronic Structure of the "Surface" and "Interior" ComplexesKenro Hashimoto and Keiji MorokumaCite this: J. Am. Chem. Soc. 1994, 116, 25, 11436–11443Publication Date (Print):Dece…
Simulations of water using the exnteded simple point charge (SPC/E) model at temperatures between 190 and 330 K were performed using molecular dynamics techniques. A maximum in the density at 1 bar pressure was found to occur at 235 K. The energies and diffusivities are also reported. The SPC/E-modeled water exhibits…
Crystal polymorphism is important because of the different physical and mechanical properties of the polymorphs. Based on a stereochemical approach to controlling crystal polymorphism using stereospecific nucleation inhibitors, auxiliaries have been designed for the precipitation of the yform of glycine (see Figure) f…
Both liquid and solid foams, together with analogous cellular materials, have distinctive mechanical or rheological properties which find many applications. This review concentrates on the search for a basic understanding of the underlying mechanisms, in terms of specific structural models. Computer simulations play a…
The crystal structures of three calcium chalcogenides CaS, CaSe, and CaTe were investigated by energy-dispersive x-ray-diffraction techniques using a synchrotron source to a static compression up to 52 GPa. For CaS and CaSe, a first-order phase transformation from the NaCl phase to the CsCl phase was observed at 40 an…
Highly transparent and conductive zinc-stannate thin films, ZnSnO 3 , have been prepared by rf magnetron sputtering using a target composed of ZnO–SnO 2 ( SnO 2 , 78 wt%). A resistivity as low as 4×10 -3 Ω·cm and an average transmittance above 80% in the visible range were obtained for undoped zinc-stannate films depo…
The molecular weight of polyaniline can be substantially increased from that normally obtained (Mw ≈ 53 000) by the oxidative polymerization of aniline with ammonium peroxydisulfate at about 0 to 3 °C up to about 218 000 by the presence of selected dissolved neutral salts. A further increase up to Mw ≈ 385 000 can be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization and Solid-State Properties of Processable N-Alkylated Polyanilines in the Neutral StateWen-Yue Zheng, Kalle Levon, Jukka Laakso, and Jan-Eric OesterholmCite this: Macromolecules 1994, 27, 26, 7754–7768Publication Date (Print):December 1, 1994Publication Hist…
Chemical characterization of passive films formed on AISI 304 austenitic stainless steel, in a borate/boric acid solution at pH 9.2, under various conditions of potential, temperature, and polarization time, was made by Auger electron spectroscopy combined with ion sputtering, and x‐ray photoelectron spectroscopy (XPS…
Monte Carlo simulations show that dense systems of spherical particles with a short-ranged attractive interaction can undego a first-order transition from a dense to a more expanded solid phase with the same structure. This phase transition is analogous to the liquid-vapor transition in systems with longer-ranged attr…
The preparation of electrochromic nickel oxide ( NiO x ) films, which are colorless in an as-deposited state, has been carried out in Ar/O 2 /H 2 mixed gas by the rf-sputtering method. Highly transparent films of as-deposited nickel oxide could be prepared in the sputtering atmosphere consisting of Ar:O 2 :H 2 =50:10:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular hyperpolarizabilities of coumarin dyesChristopher R. MoylanCite this: J. Phys. Chem. 1994, 98, 51, 13513–13516Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December 1994https://pubs.acs.org/doi/10.1021/j1…
A theory has been developed to examine the depolarization effect on the ferroelectric transition of small ${\mathrm{BaTiO}}_{3}$ particles. To reduce the depolarization energy, a crystal would break up into domains of different polarization. In this study, we consider cubic particles with alternating domains separated…