Geometric control of manganese redox state
Comparison of the structures of four monomanganese (and one monoiron) complexes of ligands with the identical donor [N3(O–)3] set reveals that geometry determines the redox state of the cation.
Materials Literature
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A heptanuclear Cr III Ni II 6 complex with a low-lying S= 15/2 ground state
A low-lying S= 15/2 ground state in a heptanuclear CrIIINiII6 species arises from the ferromagnetic interaction (J= 16.8 cm–1) between one central CrIII(S= 3/2) and six peripheral NiII(S= 1) ions through the cyanide bridge.
Synthesis and Characterization of Polyaniline Derivatives: Poly(2-alkoxyanilines) and Poly(2,5-dialkoxyanilines)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Polyaniline Derivatives: Poly(2-alkoxyanilines) and Poly(2,5-dialkoxyanilines)Giuseppe D'Aprano, Mario Leclerc, Gianni Zotti, and Gilberto SchiavonCite this: Chem. Mater. 1995, 7, 1, 33–42Publication Date (Print):January 1, 1995Publication H…
Thermal stability of doped ceria: experiment and modelling
The process of the decrease of the surface area due to crystallite growth in ceria at 943 K is described by a kinetic model involving oxygen and cerium diffusion. The experimentally found variations in the rate of crystallite growth are reported as a function of the content (⩽ 10% cat.) of dopants, which are the catio…
Reaction of Methylsilanols with Hydrated Silica Surfaces: The Hydrolysis of Trichloro-, Dichloro-, and Monochloromethylsilanes and the Effects of Curing
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of Methylsilanols with Hydrated Silica Surfaces: The Hydrolysis of Trichloro-, Dichloro-, and Monochloromethylsilanes and the Effects of CuringC. P. Tripp and M. L. HairCite this: Langmuir 1995, 11, 1, 149–155Publication Date (Print):January 1, 1995Publication Histo…
Triphenylene Columnar Liquid Crystals: Excited States and Energy Transfer
The present paper deals with the photophysical properties of columnar liquid crystals formed by hexakis-(alky1oxy)triphenylenes. Absorption and fluorescence spectra of solutions are analyzed on the basis of quantum chemical calculations performed by the CS-INDO-CI (conformations spectra-intermediate neglect of differe…
Special trends in thermal analysis
PART I: Simultaneous Thermoanalytical Examinations Under Conventional Conditions: Introduction Derivative Thermogravimetry (DTG) Simultaneous DTA, TG and DTG Derivative Dilatometry (DTD) Selectivity of the Measurements Thermo-Gas Titrimetry (TGT) A Continuous and Selective Water Detector Evolved Gas Analysis by Means…
Development of polymer blend morphology during compounding in a twin‐screw extruder. Part IV: A new computational model with coalescence
Abstract In Part II of this series of publications, the first generation model of morphology evolution during polymer blending in a twin‐screw extruder was presented. The model was based on a simplified flow analysis, and an assumption that dispersion occurs via drop fibrillation followed by disintegration. In the pre…
Nematic homogeneous photo alignment by polyimide exposure to linearly polarized uv.
Exposure of positive-type polyimide (PI) to linearly polarized deep UV (DUV) light (257nm) induced homogeneous alignment of nematic liquid crystals. The alignment state changed markedly at a particular energy of the UV light. Measurement of the UV absorption spectrum and retardation change generated in PI films by UV…
Temperature Dependence of Triton X-100 Micelle Size and Hydration
Quasi-elastic light scattering spectroscopy was used to measure the mutual diffusion coefficient, D,, of Triton X-100 micelles in aqueous solution and the translational diffusion coefficient, D,, of mesoscopic probes in the same solutions. We apply conventional hydrodynamic treatments of diffision under the assumption…
Biomedical applications of synthetic biodegradable polymers
This is a state-of-the-art, inclusive volume exploring several families of biodegradable polymers having biomedical applications. Contributing authors are active in their disciplines and therefore provide up-to-the-minute, factual data derived from hands-on experience and cutting-edge technology. Authors were selected…
History of commercial polymer alloys and blends (from a perspective of the patent literature)
Abstract Polymer blends are defined as mixtures of at least two polymeric species. Thus, the first patent polymer blend was a mixture of natural rubber, NR, with gutta percha patented by Alexander Parkes, an artist of Birmingham, in 1846. The first man‐made polymer, nitrocellulose, NC was prepared by Braconnot in 1833…
TiNi (shape memory) films silicon for MEMS applications
TiNi shape memory alloy in thin film form is an excellent candidate for MEMS microactuation. Using RF sputter deposition, thin films of TiNi (51.7 at% Ti-48.3 at% Ni) have been formed on silicon substrates and produced shape memory behavior at approximately 60/spl deg/C. Films were amorphous when deposited and were su…
Base and acid catalysis by the alkali-containing MCM-41 mesoporous molecular sieve
Sodium and caesium cation-exchanged mesoporous MCM-41 are shown to be mild, selective, water-stable and recyclable catalysts for the base-catalysed Knoevenagel condensation and acid-catalysed acetalization and aldol condensation, whereas caesium acetate-impregnated MCM-41 shows strong base activity in the Michael addi…
Fluid supersaturation and crystallization in porous media
Abstract The relationship between the supersaturation at the point of crystallization and the rate at which supersaturation increases has been studied from nucleation experiments on barite BaSO 4 , strontianite SrCO 3 , witherite BaCO 3 and gypsum CaSO 4 .2H 2 O. The crystallization experiments have been carried out b…
Screening of Bacterial Cellulose-producingAcetobacterStrains Suitable for Agitated Culture
Extensive screening for cellulose-producing Acetobacter strains suitable for agitated culture was done by developing the screening conditions. A total of 2096 strains were isolated; isolation from fruits was particularly efficient. The cellulose productivities of 412 isolates were estimated by culturing in two differe…
Effect of Spark Plasma Sintering on Densification and Mechanical Properties of Silicon Carbide
Silicon carbide ceramics which 5 mass% Al2O3 and 2 mass% Y2O3 were added to were prepared by the spark plasma sintering (SPS) method under the conditions of 30 MPa and 5 min. Mechanical properties at room temperature were eximined. The SPS brought dense silicon carbide ceramics at a sintering temperature of 1800°C, wh…
Incommensurate crystal structures
An overview is given of the crystallography of aperiodic crystals, in particular of incommensurately modulated structures and incommensurate intergrowth compounds. The symmetry, the description of the structure and diffraction are described. An extensive discussion is given of crystallographic methods for determinatio…
Enzyme-Catalyzed .epsilon.-Caprolactone Ring-Opening Polymerization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnzyme-Catalyzed .epsilon.-Caprolactone Ring-Opening PolymerizationRenee T. MacDonald, Satish K. Pulapura, Yuri Y. Svirkin, Richard A. Gross, David L. Kaplan, Joseph Akkara, Graham Swift, and Steven WolkCite this: Macromolecules 1995, 28, 1, 73–78Publication Date (Print):Jan…
Automated recognition of partial discharges
An overview of automated recognition of partial discharges (PD) is given. The selection of PD patterns, extraction of relevant information for PD recognition and the structure of a data base for PD recognition are discussed. Mathematical methods useful for the design of the data base are examined. Classification metho…