Materials Literature
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A new method of incorporating TiO2 into zeolite cavities through ion exchange of zeolites Y with an aqueous solution of ammonium titanyl oxalate oxalate monohydrate, (NH4)2TiO(C2O4)2H2O, has been developed. Characterization of the products clearly demonstrates that (1) ion exchange between the Ti species present in th…
Abstract Nanostructured materials are polycrystals with a crystal size of a few (typically 20 or less) nm and hence consist of about equal volume fractions of grain (interphase) boundary cores and crystals. Due to the large volume fractions of incherent interfaces, the diffusional processes in these materials seem to…
We present a calculation of the hydrodynamic self-diffusion coefficient of a tagged particle in a dilute mono-dispersed suspension of small neutrally buoyant spheres undergoing a steady simple shearing motion. The displacement of the tagged particle parallel to the longitudinal or streamwise direction resulting from a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the paramagnetic [Ag13Fe8(CO)32]4- tetraanion: a cuboctahedral Ag13 cluster stabilized by Fe(CO)4 groups behaving as 4-electron donorsVincenzo G. Albano, Loris Grossi, Giuliano Longoni, Magda Monari, Suzanne Mulley, and Angelo SironiCite thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTridecavanadate, [V13O34]3-, a new high-potential isopolyvanadateDong Hou, Karl S. Hagen, and Craig L. HillCite this: J. Am. Chem. Soc. 1992, 114, 14, 5864–5866Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992htt…
Tungstic oxide/polyaniline composite films were prepared by a double‐pulse electrodeposition technique, and their properties were investigated by in situ optical and electrochemical techniques. Such composite films are more conducting than pure films. The films have an electrochromic window between the anodic colorati…
Magnesium is known to be a perspective fuel for engines which could use CO2 from the atmospheres of Mars and Venus as an oxidizer. Combustion of magnesium samples introduced into a high temperature CO2/CO mixture is experimentally studied. Measurements of the burning time as well as visual observations and spectral an…
N-Oxaloglycine (3) is an alpha-ketoglutarate (1) analogue that is a competitive inhibitor of prolyl 4-hydroxylase (EC 1.14.11.2). A study of the structure-activity relationships of some other oxalo derivatives shows that substitution on the glycine moiety modulates activity stereoselectively and that if the omega-carb…
Platinum-tin on alumina catalysts appear to have potential for use during naphtha reforming in processes utilising continuous catalyst regeneration, and without the need for complex activation procedures. To gain a better understanding of the properties that contribute to their effectiveness, the surface and bulk char…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicromechanics of crack growth into a craze in a polymer glassC. Y. Hui, A. Ruina, C. Creton, and E. J. KramerCite this: Macromolecules 1992, 25, 15, 3948–3955Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992http…
In unusually high yields of 75 and 70% respectively, the macrocycles with six (1) and twelve arene units have been efficiently synthesized by cyclization of α-iodo-ω-ethynylphenyl-acetylene oligomers. The success is probably due to the preassembly of these difunctional building blocks. Molecular models indicate an inn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBirefringence detection of the order-to-disorder transition in block copolymer liquidsN. P. Balsara, D. Perahia, C. R. Safinya, M. Tirrell, and T. P. LodgeCite this: Macromolecules 1992, 25, 15, 3896–3901Publication Date (Print):July 1, 1992Publication History Published onli…
Abstract A structural investigation is described of poly( L ‐lactic acid) by best fitting of powder X‐ray diffraction patterns. The examined sample shows the already known pseudo‐orthorhombic α‐form, and it was possible to determine the location of the two 10 3 polymeric helices in the unit cell and the size distribut…
Three different industrial carbon blacks were characterized in their surface chemistry with respect to their relative abilities to activate molecular oxygen. A variety of techniques was used including x-ray diffraction, gasification experiments, electron spectroscopy as XPS and UPS, helium ion scattering spectroscopy,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerroelectric polarization mechanisms in nylon 11J. I. Scheinbeim, J. W. Lee, and B. A. NewmanCite this: Macromolecules 1992, 25, 14, 3729–3732Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org…
The high‐temperature deformation behavior of a fine‐grained polycrystalline yttrium aluminum garnet (YAG) was studied in the temperature range of 1400° to 1610°C using constant strain rate compression tests under strain rates ranging from 10 −5 /s to 10 −3 /s. The stress exponent of the creep rate, the activation ener…
These studies evaluate the effect of biomedical polymers: Biomer, polydimethyl-siloxane (PDMS), polyethylene, expanded polytetrafluoroethylene (ePTFE), Dacron, and the control polystyrene with or without adsorbed proteins IgG, fibrinogen, and fibronectin on the ability of activated human monocytes/macrophages to produ…
Abstract Photoelectron peak areas are measured using various background removal methods. Linear, horizontal, Shirley's and Tougaard's backgrounds have been tested on many spectra for different pass energies in the spectrometer. These four values, obtained for each photoelectron line, are compared together and it is sh…
A morphous solids belonging to the systems Al 2 O 3 –Me 2 O (Me = Na, K) and Al 2 O 3 –B 2 O 3 were prepared by nitrate decomposition, introducing boron in the form of boric acid. Crystalline metastable solids with pseudotetragonal symmetry were obtained from thermal treatment at 850° to 900°C for the compositions Al…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent mononuclear gold(I) phosphinesChristopher King, Mohammed N. I. Khan, Richard J. Staples, and John P. Fackler Jr.Cite this: Inorg. Chem. 1992, 31, 15, 3236–3238Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 J…