Increased Dimensional Stability in Ionically Conducting Polyphosphazenes Systems
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A Two-Stage Martensite Transformation in a Cu-13.99 mass% Al-3.5 mass% Ni Alloy
The reverse martensite transformation of an as-quenched Cu–Al–Ni shape memory alloy presents two separate stages which are studied by means of calorimetry. The first stage, corresponding to the lower temperatures, presents a thermal hysteresis of about 10 K, a continuous behaviour of the energy dissipation and a very…
Mössbauer study of Clostridium pasteurianum hydrogenase II. Evidence for a novel three-iron cluster.
Hydrogenase II contains two iron-sulfur clusters, one of the [4Fe-4S] type and one of unknown structure with unusual spectral properties (H-cluster). Using Mössbauer spectroscopy we have studied the H-cluster under a variety of conditions. In the reduced state the cluster exhibits, in zero magnetic field, spectra with…
VTFTIR and light-induced excited spin state trapping in bis(2,2'-bipyridine)bis(thiocyanato)iron and related spin-crossover compounds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVTFTIR and light-induced excited spin state trapping in bis(2,2'-bipyridine)bis(thiocyanato)iron and related spin-crossover compoundsRolfe H. HerberCite this: Inorg. Chem. 1987, 26, 1, 173–178Publication Date (Print):January 1, 1987Publication History Published online1 May 2…
Basic Formulae of XUV Multilayer Optics
The theory of multilayer optics relevant to the following fields of application is given: The choice of materials for efficient XUV reflectors, Obtainment of high spectral resolution, Construction of polarizers and collimators for XUV beams.
Adhesion mechanism of polyvinyl chloride to silane primed metal surfaces
The interface of partially hydrolyzed organosilane primer Dow Corning® Z-6020 [N-(2-aminoethyl-3-aminopropyl trimethoxy silane], which will be referred to in this paper as simply AEAPS, and polyvinyl chloride (plastisol) was examined by XPS (X-ray photoelectron spectroscopy) depth profile analysis. These studies and t…
Variation in nitroxide probe chain flexibility within sodium dodecyl sulfate hemimicelles
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariation in nitroxide probe chain flexibility within sodium dodecyl sulfate hemimicellesPrem. Chandar, P. Somasundaran, Kenneth C. Waterman, and Nicholas J. TurroCite this: J. Phys. Chem. 1987, 91, 1, 148–150Publication Date (Print):January 1, 1987Publication History Publis…
Performance of Polymeric Insulating Materials in Salt-Fog
The paper presents the results of a study conducted on polymeric insulating materials in a salt-fog chamber. The materials examined include high temperature vulcanized (HTV) silicone rubber, ethylene propylene rubber (EPR) and cycloaliphatic epoxy. The influence of inorganic filler, type, concentration and dispersion…
Precholesteric liquid crystalline states of DNA
In aqueous concentrated solution, DNA forms cholesteric liquid crystalline phases whose textures were previously analysed. The transition between the isotropic and the cholesteric phase occurs generally with formation of cholesteric spherulites which grew inside of the isotropic phase and coalesce to give a homogeneou…
Crack layer theory
A damage parameter is introduced in addition to conventional parameters of continuum mechanics and consider a crack surrounded by an array of microdefects within the continuum mechanics framework. A system consisting of the main crack and surrounding damage is called crack layer (CL). Crack layer propagation is an irr…
Synthesis of montmorillonite–viologen intercalation compounds and their photochromic behaviour
The photochemical properties of four different viologen di-cations (V2+,1,1′-dipropyl-, 1,1′-diheptyl-, 1,1′-diphenylmethyl- and 1,1′-diphenylethyl-4,4′-bipyridinium di-cations) intercalated into the interlayer space of montmorillonite have been studied. The colour of the intercalation compounds which were co-intercal…
The solubility and diffusion of water in poly(aryl‐ether‐ether‐ketone) (PEEK)
Abstract The transport properties of water in neat poly(aryl‐ether‐ether‐ketone) (PEEK) coupons (2 to 6 mm thick) were investigated by gravimetric and mass spectrometric methods. The solubility of water increases from 0.44 wt.% at 35°C to 0.55 wt.% at 95°C; the temperature coefficient is 8 kJ/mol (1.9 kcal/mol). The d…
pH dependence of surface-enhanced Raman scattering spectra from 2,2'-bipyridine adsorbed on silver colloids
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTpH dependence of surface-enhanced Raman scattering spectra from 2,2'-bipyridine adsorbed on silver colloidsMunsok. Kim and Koichi. ItohCite this: J. Phys. Chem. 1987, 91, 1, 126–131Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Publishe…
Nd-Fe-B Permanent Magnets: Hydrogen Absorption/Desorption Studies (HADS) on Nd16Fe76B8 and Nd2Fe14B
The hydrogen absorption/desorption (HAD) behaviours of alloys based on Nd 15 Fe 77 B 8 (Neomax composition) and the stoichiometric phase Nd 2 Fe 14 B have been examined in an attempt to relate these effects to the microstructures of these alloys. The HAD processes were studied by microbalance, Differential Thermal Ana…
Long - Term Behavior of XLPE Insulated Cable Models
A test cycle with electrical, thermal and combined stresses has been performed on models of XLPE insulated: cables in order to characterize this type of cable from the viewpoint of endurance to combined stresses. For this purpose the method of Combined Analysis of experimental data has been used, thus permitting the g…
Kinetics of phase separation in polymer mixtures
Characteristic features of the liquid-liquid phase separation process in polymer systems are presented, followed by a concise review of existing studies on phase-separation kinetics in polymer solutions and mixtures. Brief discussions have been made on two selective topics in this field, i.e., applicability of Cahn's…
Mechanisms controlling high temperature embrittlement due to helium
High temperature embrittlement due to helium is controlled by helium-assisted cavity formation on grain boundaries. The basic mechanisms, underlying this process are discussed: bubble nucleation and growth, bubble-void conversion and void growth, crack formation by void coalescence. Differences between the microstruct…
Water Absorption of Resins and Composites: I. Epoxy Homopolymers and Copolymers
Water absorption experiments have been carried out on three DGEBA type epoxy resins. A reactive diluent added to the resin increased water permeation, while a monomer that expanded on cure decreased it. Exposure at 97% relative humidity (RH) gave results that closely paralleled those obtained by water immersion, thoug…
Preparation of Cordierite Ceramics from Metal Alkoxides (Part 1)
A new method for preparing homogeneous cordierite ceramics by a sol-gel process is described. Reactive and fine cordierite-type amorphous powder with high homogeneity was prepared by the sol-gel method. The hydrolysis of metal alkoxides used as starting materials was controlled. Namely, Si(OC2H5)4, with a hydrolysis r…
Quantitative Characterization and Performance of Porous Implants for Hard Tissue Applications
Description Thirty-one papers cover several interrelated investigations: mechanical properties of porous coatings and substrates; characterizations of pore dimensions; biodegradation and biological analysis; performance in human and laboratory animals; modeling and implant fixation; and systems for future applications.