Materials Literature
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Abstract An in situ FTIR study of the reduction of NO by propylene in O2 has shown that the reaction on the Rh/Al2O3 surface at 623 K leads to the formation of IR bands assigned to adsorbed hydrocarbons, -NCO, -CN, -NO+, -CO32− and CO2 species. The intensity of the bands depends on the reaction time and the presence o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIonic Interactions and Charge Transport Properties of Metallopolymer Films on ElectrodesRobert J. Forster and Johannes G. VosCite this: Langmuir 1994, 10, 11, 4330–4338Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1…
Based on the RBAO technology, low‐shrinkage mullite/SiC/ Al 2 O 3 /ZrO 2 composites were fabricated. A powder mixture of 40 vol% Al, 30 vol% A1 2 O 3 and 30 vol% SiC was attrition milled in acetone with TZP balls which introduced a substantial ZrO 2 wear debris into the mixture. The precursor powder was isopressed at…
Ferroelectric Pb[(Mg 1/3 Nb 2/3 ) x Ti 1- x ]O 3 (PMNT) thin films with a well-developed perovskite structure were prepared on Si(100) and Pt/Ti/ SiO 2 /Si(100) substrates by rf magnetron sputtering deposition at high substrate temperatures of 480–650° C. The effect of substrate materials was investigated by X-ray dif…
The composition ranges of Al-Ni-Co decagonal quasicrystals in superlattice-ordered and disordered states have been investigated. The single-decagonal-phase region is limited to a very small area around ${\mathrm{Al}}_{71}$${\mathrm{Ni}}_{16}$${\mathrm{Co}}_{13}$ at 650 \ifmmode^\circ\else\textdegree\fi{}C, which expan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhanced Electrochemical Deposition with an Atomic Force MicroscopeJohn R. LaGraff and Andrew A. GewirthCite this: J. Phys. Chem. 1994, 98, 44, 11246–11250Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994…
We present high-resolution specific-heat, C, measurements on a large (4.47 mg) single crystal of \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$${\mathrm{I}}_{3}$ from 0.25 to 20 K in zero and different magnetic fields. The electronic specific-heat coefficient in the normal state is extracted to \ensuremath{\gamma}=(18.9\ifmmo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of four-coordinate aluminum oxynitride (AlO4-xNx) environments in AlON solids by MAS 27Al NMR at 14 TJohn J. Fitzgerald, Scott D. Kohl, Gilberto Piedra, Steven F. Dec, and Gary E. MacielCite this: Chem. Mater. 1994, 6, 11, 1915–1917Publication Date (Print):Novemb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Layered Borates Ba3M(BO3)3 (M = Dy, Ho, Y, Er, Tm, Yb, Lu, and Sc)James R. Cox, Douglas A. Keszler, and Jinfan HuangCite this: Chem. Mater. 1994, 6, 11, 2008–2013Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 No…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-insulator transitions in La1-xTiO3, 0.0 .ltoreq. x .ltoreq. 0.33. structure-property correlationsM. J. MacEachern, H. Dabkowska, J. D. Garrett, G. Amow, Wenhe Gong, Guo Liu, and J. E. GreedanCite this: Chem. Mater. 1994, 6, 11, 2092–2102Publication Date (Print):Novembe…
Crystallography provides a major approach toward reaching an understanding of the relationship between crystal structure and material physical properties. The specific relationships of five highly structure dependent physical properties, namely piezoelectricity, pyroelectricity, ferroelectricity, ferroelasticity and o…
Brewster angle microscopy (BAM) and polarized fluorescence microscopy (PFM) were used to observe domains of a tilted condensed phase in coexistence with an isotropic liquid phase in Langmuir monolayers of pentadecanoic acid. The orientation of the molecular tilt direction inside the domains can be described as a ‘‘vir…
Summary X‐ray detection by energy‐dispersive spectrometry in the analytical electron microscope (AEM) is often limited by low collected X‐ray intensity ( P ), modest peak‐to‐background ( P/B ) ratios, and limitations on total counting time (τ) due to specimen drift and contamination. A new AEM has been designed with m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of "Wheel-and-Axle"-Type Porphyrin Arrays Composed of Phosphorus PorphyrinsHiroshi Segawa, Kazuhiko Kunimoto, Kimihiro Susumu, Masahito Taniguchi, and Takeo ShimidzuCite this: J. Am. Chem. Soc. 1994, 116, 24, 11193–11194Publication Date (Print):November 1, 1994Publ…
Abstract Previous studies have demonstrated techniques by which model elastomers prepared by end linking poly(dimethylsiloxane) (PDMS) chains can be reinforced by the in-situ precipitation of silica from a base-catalyzed sol-gel conversion of tetraethoxysilane (TEOS). The present investigation extends this technique t…
We have investigated the electron affinity of (111) and (100) single crystalline surfaces of chemical-vapor-deposited diamond with additional treatments. For specimens exposed to hydrogen plasma (H treatment), the electron affinities are found to be negative from photoyield spectra using ultraviolet synchrotron radiat…
The stable Al-Cu-Co, Al-Ni-Co and Al-Ni-Fe decagonal quasicrystalline phases were studied by transmission electron microscopy and powder X-ray diffraction. These phases were found to be isotypic in all three alloy systems. Minor differences in the intensity distributions in their electron diffraction patterns can be a…
5-Formyltetrahydropteroylpolyglutamate (5-CHO-H4PteGlun) is the only reduced folate derivative that is stable to oxidation and alkaline pH. However, no metabolic role has been assigned to this folate derivative, and evidence for its existence in cells has been questioned. Recently, serine hydroxymethyltransferase was…
Silicon oxycarbide glasses were synthesized by the sol‐gel process using precursors such as methyl‐, propyl‐, and phenyltrimethoxysilanes. The final products contained 14–38 wt% carbon. A TEM study on the nanometer scale revealed that all of the materials were amorphous and monophasic, and that it was not possible to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and Synthesis of Functionalized Polyimides for Second-Order Nonlinear OpticsDong Yu and Luping YuCite this: Macromolecules 1994, 27, 23, 6718–6721Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994ht…