Materials Literature
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Unsymmetrically substituted (phthalocyaninato)nickel(II) complexes –7 were synthesized by statistical condensation of 4,5‐dipentoxy‐ ( 2a ), 4,5‐diheptyl‐ ( 2b ), 3,6‐dihexoxy‐ ( 2c ), and 3,6‐diheptylphthalonitrile ( 2d ) with 3,4,5,6‐tetraphenylphthalonitrile ( 1 ) and separated by column chromatography. The obtaine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination Patterns for Biliverdin-Type Ligands. Helical and Linked Helical Units in Four-Coordinate Cobalt and Five-Coordinate Manganese(III) Complexes of OctaethylbilindioneAlan L. Balch, Marinella Mazzanti, Bruce C. Noll, and Marilyn M. OlmsteadCite this: J. Am. Chem. S…
Cyclotrimerization of 4,5‐bis(hexylthio)phthalodinitrile ( 1 ) in 1‐chloronaphthalene in the presence of BCl 3 leads to the subphthalocyanine 4 . Unsymmetrical phthalocyanines ( 5, 6 ) with six alkylthio substituents on three of the benzenoid units are synthesized by the reaction of 4 with an diiminoisoindoline deriva…
The surfaces of medical devices may promote both coagulation and infections caused by adherent microorganisms. In the case of polymeric elastomers, these iatrogenic effects are likely intermediated by absorbed host proteins that spontaneously bind to the device surface, promoting both bacterial adherence and thromboti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Protocol to Entrap Active Urease in a Tetraethoxysilane-Derived Sol-Gel Thin-Film ArchitectureUpvan Narang, Paras N. Prasad, Frank V. Bright, Arun Kumar, N. Deepak Kumar, B. D. Malhotra, M. N. Kamalasanan, and Subhas ChandraCite this: Chem. Mater. 1994, 6, 10, 1596–1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRNA Cleavage and Phosphate Diester Transesterification by Encapsulated Lanthanide Ions: Traversing the Lanthanide Series with Lanthanum(III), Europium(III), and Lutetium(III) Complexes of1,4,7,10-Tetrakis(2-hydroxyalkyl)-1,4,7,10-tetraazacyclododecaneK. O. Aileen Chin and Ja…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSterically Stabilized Colloidal Particles as Model Hard SpheresS. M. Underwood, J. R. Taylor, and W. van MegenCite this: Langmuir 1994, 10, 10, 3550–3554Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994http…
The fracture behavior of PZT specimens driven at their resonant frequency by the application of an ac voltage was investigated and compared with fracture behavior of monotonically loaded PZT. Microcracking was observed in the cyclically loaded specimens; above 150°C, the micro‐cracks were dispersed in small clusters,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Investigation of Framework Substitution of Cobalt into Aluminophosphate-5 Using Electron Spin Resonance and Temperature-Programmed Desorption MeasurementsVadim Kurshev, Larry Kevan, D. J. Parillo, C. Pereira, G. T. Kokotailo, and R. J. GorteCite this: J. Phys. Chem. 1994,…
The sample volume in diamond-anvil pressure cells suitable for X-ray powder diffraction studies is very small (</= 100 mum across). The resulting low signal-to-noise ratio has made it very difficult to obtain useful results with monochromatic angle-dispersive techniques, and the alternative white- beam energy-dispersi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis(2,3-naphthalocyaninato)lutetium(III) and (2,3-Naphthalocyaninato)(phthalocyaninato)lutetium(III) Complexes: Synthesis, Spectroscopic Characterization, and ElectrochemistryFrancois Guyon, Annig Pondaven, Pierre Guenot, and Maurice L'HerCite this: Inorg. Chem. 1994, 33, 21…
This article investigates the structure of an Er luminescence center in GaAs by using its intra-4f-shell luminescence spectrum as an atomic probe to identify the atomic configuration. This Er center is formed in GaAs by metalorganic chemical vapor deposition with O codoping and the center shows a high efficiency and a…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract— Failure of ceramic materials occurs when the stress intensity factor of the most serious crack in a component reaches a critical value K I , C , the fracture toughness of the material. In case of ideal brittle materials the fracture toughness is independent of the crack extension and, consequently, identical…
Electroactive pH‐controlled membranes are a potential application of materials presented here. The functionalization of conjugated pyrroles with pendant carboxylic groups has been used to produce polymer electrodes exhibiting the electrochemically‐controlled release of protons. The synthesis and the electrochemical ch…
In order to evaluate the performance of high‐Cr cast‐steel (15.4% Cr), as a pump casing material, abrasive wear, hardness, corrosion, erosion‐corrosion resistance were examined and compared with grey cast iron eventually used. The results obtained were analyzed on a microstructural basis with respect to Cr content of…
Compounds with the general formula C a H b N c O d X x (where X=boron and/or a non-metallic element of the third to fifth period; b≥1; a, c, d, e... x≥0) have been studied using the Cambridge Structural Database as a source of data and a search tool. Two relationships between the volume (V) and the number of formula u…
In the local deformation of the c-domain BaTiO3 crystal an “internal” 90° domain is formed in its bulk which does not reach any of the crystal surfaces. Conditions for its formation, its geometry and growth dynamics have been investigated. The effects of the monodomainization, “ageing” after “molding” by an electric f…
Abstract— A mathematical model of crack propagation due to the formation of a fractal cluster of voids and microcracks is presented. The initiation of a microcrack from a pile‐up of dislocations in the vicinity of a crack tip is modelled. A method to determine the fractal dimension of a crack, based on the crack growt…
Based on a microbalance, we have constructed a low-field Faraday magnetometer, which does not suffer from instability even with strongly ferromagnetic samples. The intrinsic value of this technique is that simultaneous gravimetric determination of the interstitial content (for example H, N or C) is possible. The desig…