Poly(pyrrole) as a support for electrocatalytic materials
D. Curran, J. Grimshaw and S. D. Perera, Chem. Soc. Rev., 1991, 20, 391 DOI: 10.1039/CS9912000391
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Preparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on silica
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of highly dispersed cobalt oxide and sulfide catalysts supported on silicaYasuaki Okamoto, Kozo Nagata, Toshinori Adachi, Toshinobu Imanaka, Kazuhiro Inamura, and Toshiyuki TakyuCite this: J. Phys. Chem. 1991, 95, 1, 310–319Publication Date (…
Material failure mechanisms and damage models
This work introduces a tutorial series on material failure mechanisms and damage models to familiarize nonspecialists with the fundamentals of failure mechanisms in engineering assemblies. Since failure is a complicated concept, four simple conceptual models for failure are discussed: stress-strength, damage-endurance…
Chemistry of Ag n aggregates in aqueous solution: non-metallic oligomeric clusters and metallic particles
Since the discovery of long-lived oligomeric silver clusters in aqueous polyanion solutions it has become possible to investigate the chemical reactivity of silver aggregates over a wide size range, especially in the range where the transition from the atom to the metal takes place.Both oligomeric and metallic particl…
Techniques for characterization of electrodes and electrochemical processes
STRUCTURE AND COMPOSITION OF ELECTRODES AND ELECTROLYTES: Techniques for the Study of Solid Ionic Conductors Ellipsometry as an In Situ Probe for Study of Electrode Processes In Situ Characterization of Electrode Processes by Photothermal Deflection Spectroscopy Surface X-Ray Absorption Spectroscopy, EXAFS and NEXAFS…
Synthesis and ultrastructural studies of styrene-divinylbenzene Polyhipe polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and ultrastructural studies of styrene-divinylbenzene Polyhipe polymersP. Hainey, I. M. Huxham, B. Rowatt, D. C. Sherrington, and L. TetleyCite this: Macromolecules 1991, 24, 1, 117–121Publication Date (Print):January 1, 1991Publication History Published online1 Ma…
EXAFS determination of the structure of cobalt in carbon-supported cobalt and cobalt-molybdenum sulfide hydrodesulfurization catalysts
The structure of the cobalt present in carbon-supported Co and Co-Mo sulfide catalysts was studied by means of X-ray\nabsorption spectroscopy at the Co K-edge and by X-ray photoelectron spectroscopy (XPS). Thiophene hydrodesulfurization\nactivities were used to measure the catalytic properties of these catalysts. By c…
Preclinical evaluation of MnDPDP: new paramagnetic hepatobiliary contrast agent for MR imaging.
Manganese(II)-N,N'-dipyridoxylethylenediamine-N,N'-diacetate-5,5'-bis (phosphate) (MnDPDP) is a paramagnetic complex designed for use as a hepatobiliary agent. The T1 relaxivity of MnDPDP (2.8 [mmol/L]-1.sec-1 in aqueous solution) was similar to that of gadolinium diethylenetriaminepentaacetic acid (DTPA) (4.5 [mmol/L…
Decay of density fluctuations in gels
Near the sol-gel transition, gelling systems exhibit an extremely slow relaxation of thermally driven density fluctuations. We have made a detailed quasielastic light scattering study of the decay of density fluctuations in reacting silica sol-gels in the pre- and post-gel regimes, and at the gel point. In the pre-gel…
Nonlinear circuit analysis using the method of harmonic balance—A review of the art. Part I. Introductory concepts
Abstract The harmonic balance method is a technique for the numerical solution of nonlinear analog circuits operating in a periodic, or quasi‐periodic, steady‐state regime. The method can be used to efficiently derive the continuous‐wave response of numerous nonlinear microwave components including amplifiers, mixers,…
An approach to porphyrin-based molecular wires: synthesis of a bis(porphyrin)tetraone and its conversion to a linearly conjugated tetrakisporphyrin system
An approach to molecular wires based on quasi-one-dimensional linearly conjugated poly-porphyrin systems is outlined and a rationally designed synthesis of the tetrakisporphyrin 9, a strand some 65 Å in length, via the bis(porphyrin)tetraone 2 is described.
Stochastic properties of partial-discharge phenomena
The author presents a bibliography and survey of the literature concerned with theory and measurement of the stochastic behavior of pulsating partial-discharge (PD) phenomena that can occur when insulation is subjected to electrical stress. The types of PD phenomena considered include AC and DC generated electron aval…
A review of the fabrication and properties of erbium-doped fibers for optical amplifiers
Erbium-doped fiber has become the central component of nearly all optical amplifiers. Applications reported include repeaters, power amplifiers, preamplifiers, and distributed amplifiers. To date, nearly all the fiber used in these devices has been silica based and fabricated by variations on the major telecommunicati…
Photoinduced electron transfer in the solid state: rate vs. free energy dependence in fixed-distance porphyrin-acceptor molecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron transfer in the solid state: rate vs. free energy dependence in fixed-distance porphyrin-acceptor moleculesGeorge L. Gaines III, Michael P. O'Neil, Walter A. Svec, Mark P. Niemczyk, and Michael R. WasielewskiCite this: J. Am. Chem. Soc. 1991, 113, 2, 71…
Angiotensin II stimulates collagen synthesis in cultured vascular smooth muscle cells
The journal consistently attracts the most important and highly innovative papers from the current research; our commitment to rapid publication ensures that these are published in the fastest time possible. In addition to primary papers from world-renowned experts, the Journal contains authoritative reviews that summ…
Phase transformations in materials
Thermodynamics and phase diagrams of materials, A.D.Pelton diffusion in crystalline solids, G.E.Murch statistical theories of phase transitions, K.Binder homogeneous second phase precipitation, R.Wagner transformations involving interfacial diffusion, G.R.Purdy diffusionless transformations, L.Delaey spinodal decompos…
Polyhydroxyalkanoic acids
Polyhydroxyalkanoic acids (PHA) are water-insoluble polyesters of alkanoic acids containing a hydroxyl group as at least one functional group in addition to the carboxy group, and possess the general formula shown in Fig. 1. Although some of these polymers are also available from chemical synthesis, many of them are s…
Chirality in liquid crystals
Chirality has become arguably the most important and complex topic of research in liquid crystals today. The reduced symmetry in these organized phases leads to a variety of novel phase structures, properties, and applications. Molecular asymmetry imparts form chirality to liquid-crystalline phases, which is manifeste…
Octabromotetraphenylporphyrin and its metal derivatives: Electronic structure and electrochemical properties
The free-base octabromotetraphenylporphyrin (H2OBP) has been prepared by a novel bromination reaction of (meso-tetraphenylporphyrinato)copper(II). The metal [V(IV)O, Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Ag(II), Pt(II)] derivatives exhibit interesting electronic spectral features and electrochemical redox properties…
Angiotensin II stimulates collagen synthesis in cultured vascular smooth muscle cells
The aim of the present study was to investigate whether angiotensin II, by increasing extracellular matrix synthesis, contributed to the vascular wall thickening observed in hypertension. Thus, we examined the direct effects of angiotensin II on collagen and fibronectin synthesis in cultured rat vascular smooth muscle…