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The complex [Ni(12-aneN4)(OH2)2](ClO4)2·H2O (12-aneN4 = 1,4,7,10-tetraazacyclododecane) has been prepared and its structure determined. The complex crystallizes in the orthorhombic space group P212121 With a= 11.173(5), b = 11.976(5) and c = 13.969(4) Å. The volume of the unit cell is 1869(1) Å3. The total reflections…
Abstract The Sharma constant S o , the isochoric temperature coefficient of volume expansivity, the isochoric temperature coefficient of internal pressure, the reduced compressibility, the reduced volume and a few other acoustic parameters are evaluated for N‐(P‐Hexyloxybenzylidene)‐P‐Toluidine (HBT) using only the co…
Abstract Effects of counter cation on the anionic polymerization of N ‐phenylmaleimide ( N ‐PMI) were investigated with alkali metal tert ‐butoxides. N ‐PMI was more rapidly polymerized in the polymerization system with a larger size of counter cation (K + > Na + > Li + , e.g., 100% for K + , 20 min, and 2.7% fo…
A molecular dynamics experiment was designed to follow the sequence of depolymerization reactions occurring when a polymer degrades into its constituent monomers. This simulation addresses internal changes that certain materials undergo at the moment of burning. Polymer fragments were thermally generated from the rand…
<div class="htmlview paragraph">This paper describes experimental results obtained while operating three different diesel engines using fuels treated with a platinum organometallic fuel additive. Platinum group organometallics that are soluble and stable in hydrocarbons were used. The projected cost of the addit…
LEED fine structure features are due to an interference between the measured beam (usually the specular) and a pre-emergent beam. This pre-emergent beam is internally reflected at the surface potential barrier and is subsequently diffracted by the substrate into the same direction as the beam under observation. As a r…
Abstract The feasibility of transforming palygorskite from two localities to smectite hydrothermally at temperatures ranging from 22° to 160°C was investigated in a series of laboratory experiments, in which alkalinity was maintained in the pH range of 11.4 to 12 by adding NaOH. The smectite formed was characterized b…
Abstract Complexes [NiL2(H2O)X]X·nH2O (L=N,N-dimethyl-1,2-ethanediamine; n=0 when X=BF4; n=1 when X=Br; n=3 when X= Cl), [NiL2(H2O)Y]·nH2O (n=2 when Y= SeO4; n=5 when Y=SO4), [NiL2(H2O)2](NO3)2·H2O and [NiL2] (ClO4)2 have been synthesized and investigated thermally in the solid state. The complexes [NiL2(H2O)Cl]Cl·3H2…
The application of submicron grating structure for light trapping in thin silicon solar cells has been investigated theoretically and experimentally. A gain in absorption corresponding to an increase in thickness of more than a factor of 4 for polarized light and about 3 for unpolarized light has been demonstrated.
This paper is a review of already published work. Exciton-relaxation processes in organic solids are discussed. Pyrene and poly(phenylenevinylene) (PPV) crystals are investigated as two examples of strong exciton–phonon coupled systems. Free-exciton luminescence is observed simultaneously with self-trapped exciton lum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZinc N-substituted porphyrins as novel initiators for the living and immortal polymerizations of episulfideTakuzo Aida, Kenichi Kawaguchi, and Shohei InoueCite this: Macromolecules 1990, 23, 17, 3887–3892Publication Date (Print):August 1, 1990Publication History Published on…
Abstract The influence of particle size on particulate fouling rates during convective sensible heat transfer to liquids has been investigated. Experiments have been carried out using aluminum oxide particles with nominal diameters ranging from 0.06 μm to 15 μm, suspended in an organic solvent for a wide range of conc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of the "pendant-arm" macrocycle 6,13-diamino-6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane to chromium(III). Crystal structure and physical properties of the hexacoordinated complex ionPaul V. Bernhardt, Peter Comba, Neil F. Curtis, Trevor W. Hambley, Geoffrey…
Ultrasonication is very effective in dispersing alumina and barium titanate slurries. When optimum conditions are used, very short durations (2 to 3 min) are enough to achieve well‐dispersed, stable suspensions.
Microcrystalline vaterite, CaCO3, has been synthesized by decomposition of ikaite, CaCO3.6H2O, crystals at room temperature. Scanning electron micrographs show that vaterite occurs as arborescent aggregates ~30 to 40 μm in size. This growth form has not been described before. It is of interest that the overall morphol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe electronic structure of barium gallium antimonide (Ba7Ga4Sb9): a compound seemingly probing the limits of the Zintl conceptPere Alemany, Santiago Alvarez, and Roald HoffmannCite this: Inorg. Chem. 1990, 29, 17, 3070–3073Publication Date (Print):August 1, 1990Publication…
The insulator‐to‐metal transition , doping, the mechanism of conductivity, solitons, and organic ferromagnets are among the topics covered in this overview of developments in conducting polymers. The materials are already in commercial use in, for example, batteries. Further possibilities are examined and the latest d…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation W. J. McGrory, W. H. Tuminello; Determining the molecular weight distribution from the stress rel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of nickel carbonyl clusters: chemical bonding and spectroscopy of [Ni5(CO)12]2-, [Ni6(CO)12]2-, and [Ni8C(CO)16]2- studied by the LCGTO-LDF methodGianfranco Pacchioni and Notker RoeschCite this: Inorg. Chem. 1990, 29, 16, 2901–2908Publication Date (Print…
Methodology for designing reliable ceramic components requires a precise evaluation and correlation of strengths in different stress states. The present paper compares the merits of the Weibull approach and the multiaxial elemental strength model on an experimental case involving mixed‐mode failure in the presence of…