Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Modeling of Gas Formation in the Thermal Decomposition of Powdery Cellulose and Pine SawdustRafael Bilbao, Jesus Arauzo, and Maria L. SalvadorCite this: Ind. Eng. Chem. Res. 1995, 34, 3, 786–793Publication Date (Print):March 1, 1995Publication History Published…
Fragipans are a common feature in Pennsylvania, occurring in 30% of Pennsylvania' soils. These fragipans resist root penetration and are characterized by very coarse prismatic structure, firm to very firm brittle consistence, low permeability, bulk densities that are higher than overlying horizons, loamy textures, and…
Abstract Measurements of the kinetics of acid dissolution of synthetic aluminous goethites and corresponding hematites produced by heating of parent Al-goethites at various temperatures were carried out in 1 M HC1 at 30, 40 and 50 ° C. Dissolution-time curves show sigmoidal shapes for the goethites (110 ° C), whereas…
The synthesis of poly(p-methylstyrene)–polyisobutylene–poly(p-methylstyrene) triblock copolymer was accomplished by sequential monomer addition. The synthesis involves the living polymerization of isobutylene by the TiCl4/methylchloride:hexanes, 40:60 v:v/ −80°C system in the presence of di-tert-butylpyridine using di…
A method of improving the adhesion of carbon thin films deposited using a cathodic vacuum arc by the use of implantation at energies up to 20 keV is described. A detailed analysis of carbon films deposited onto silicon in this way is carried out using complementary techniques of transmission electron microscopy and x-…
Two-stage melting is observed in a two-dimensional colloidal suspension with dipolar interactions. Micrometer-sized polystyrene spheres dispersed in water are confined to two dimensions between glass cover slides. Application of an ac electric field normal to the layer leads to an interparticle interaction that is to…
We have measured the electron emission from a CsI-coated multiwire cathode, induced by ultraviolet photons and electrons, in vacuum at high electric fields. We found an enhancement in quantum efficiency of a factor of 1.5 at 160 nm, 3 at 185 nm, and 25 above 200 nm, at a field of 500 kV/cm. At the short wavelengths th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Unusual Transition Metal Cluster Containing a Seven Metal Atom Plane. Syntheses and Crystal Structures of [Mn][Mn7(THF)6(CO)12]2, Mn3(THF)2(CO)10, and [Mn(THF)6][Mn(CO)5]2Gapgoung Kong, George N. Harakas, and Bruce R. WhittleseyCite this: J. Am. Chem. Soc. 1995, 117, 12,…
Abstract High-temperature Raman spectroscopy and optical microscopic observations have revealed a new metastable polymorph of CaAl 2 Si 2 O 8 composition, which brings to four the number of known crystalline phases in this system. Similar to the metastable monoclinic pseudo-orthorhombic and pseudo-hexagonal phases, th…
Abstract LiBaBS 3 (P2 1 /c; a = 7,577(2) Å, b = 8,713(2) Å, c = 8,687(2) Å, β = 116,22(2)°; Z = 4) und LiBaB 3 S 6 (Cc; a = 15,116(3) Å, b = 8,824(2) Å, c = 8,179(2) Å, β = 117,46(3)°; Z = 4) wurden durch Reaktion stöchiometrischer Mengen der Metallsulfide mit Bor und Schwefel bei 750°C dargestellt. Die Anionenteilstr…
PZT thin films were synthesized by sol-gel on a Pt/Ti double layer bottom electrode or on a Pt single layer bottom electrode to investigate the bottom electrode dependence of PZT film structure. On Pt/Ti, <111> oriented perovskite grains with 50–100 nm lateral size were densely packed. On Pt, large perovskite grains (…
The magnetostrictive and magnetoelastic properties of amorphous wires produced by rapid quenching in rotating water are reviewed, with particular reference to the domain structure. Saturation magnetostriction and engineering magnetostriction of as-quenched and annealed wires having compositions of the type Fe/sub x/Co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Gallium(III) 2-Hydroxy-5,10,15,20-tetraphenylporphyrin. A Novel Example of a Cyclic Gallium(III) Porphyrin TrimerJacek Wojaczynski and Lechoslaw Latos-GrazynskiCite this: Inorg. Chem. 1995, 34, 5, 1054–1062Publication Date (Print):March 1, 1…
Abstract Metal complexes with TCNQ as ligands, [MnIII(salen)(TCNQ)0.5][MnIII(salen)(TCNQ)0.5(CH3OH)]CH3OH·H2O (1) and [FeII(CH3OH)4(TCNQ)2]TCNQ·2CH3CN (2) (where TCNQ and H2salen represent tetracyanoquinodimethane and quadridentate schiff base N,N′-disalicylideneethylenediamine, respectively) were prepared, and crysta…
All articles of this category The photooxygenation of 5-hydroxymethyl-2-furfural (1a) or derivatives 1b-g yields 4-hydroxy- Δ 2 -butenolides 2 which are the precursors of butenolides 3 or α , β -unsaturated γ -oxo esters 5 . The selective reduction of olides 2 or oxo esters 5 with zinc in acetic acid under sonication…
The minimization of particle contamination during wet processing of Si wafers, such as from particles in solutions with surfactants, was studied. It was demonstrated that particle deposition on wafer surfaces in solutions is determined by an attractive or a repulsive electrostatic force through the zeta potentials of…
Electron-beam induced deposition has been shown to be capable of creating structures of nanometer size in three dimensions without supplementary process steps like lift-off or etching procedures. Tips can be produced with radii of curvature comparable to the beam diameter used for deposition, i.e., some nanometers. By…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrophilic Activation of Aliphatic C-H Bonds Mediated by Zirconium Hydride Entities and Applied to the Functionalization of the Porphyrinogen PeripheryDenis Jacoby, Sylviane Isoz, Carlo Floriani, Angiola Chiesi-Villa, and Corrado RizzoliCite this: J. Am. Chem. Soc. 1995,…
Abstract 2,2′‐Bis(2‐oxazoline) and 2,2′‐bis[5,6‐dihydro‐(4H)‐1,3‐oxazine] have been used as chain coupling reagents ( CC ) and reacted in the bulk with α,ω‐dicarboxy‐poly(2,2′‐oxydiethylene adipate) ( PS ) or with α,ω‐dicarboxy‐polyamide 12 ( PA ). The reactions have been followed by viscosimetry, titration of COOH gr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvenient Synthesis of Water Soluble, Isomerically Pure Ruthenium Phthalocyanine ComplexesGerald E. Bossard, Michael J. Abrams, Marilyn C. Darkes, Jean F. Vollano, and Robert C. BrooksCite this: Inorg. Chem. 1995, 34, 6, 1524–1527Publication Date (Print):March 1, 1995Public…