Methods of X-Ray and Neutron Scattering in Polymer Science
Methods of X-Ray and Neutron Scattering in Polymer Science , Ryong-Joon Roe Oxford U. Press, New York, 2000. $80.00 (331 pp.). ISBN 0-19-511321-7 Buy at Amazon
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Multilayer Diffraction Gratings Al/GaAs as Polaritonic Photodetectors
This article is devoted to the investigation of multilayer diffraction grating of Al/GaAs using spectroscopic ellipsometry. The ellipsometric parameters ψ and Δ were measured under conditions of surface polariton excitation, as well. Various representations of the dielectric function for the analysis of optical data o…
Magnetic field and electromagnetic force analysis of 3-phase air-core superconducting power transformer
The superconducting windings of the air-core superconducting power transformer have possibilities of being exposed to a higher magnetic field than those of the iron-core transformer because of no special paths for magnetic flux. Thus, in this paper, the magnetic field and electromagnetic force acting on the windings o…
Structural Evolution of Thermal‐Sprayed Yttria‐Stabilized ZrO 2 Thermal Barrier Coatings with Annealing—A Neutron Diffraction Study
We studied the influence of the annealing temperature on the atomic structure of yttria‐stabilized tetragonal zirconia (YSZ) which was deposited as a 300 μm thick thermal barrier coating (TBC) on nickel superalloy substrates by plasma spraying. To obtain neutron powder diffraction patterns of the barrier coatings we u…
Tunneling and Optical Spectroscopy of InAs and InAs/ZnSe Core/Shell Nanocrystalline Quantum Dots
We combine scanning tunneling spectroscopy and photoluminescence excitation spectroscopy (PLE) to study the electronic level structure and single electron charging effects of InAs and novel InAs/ZnSe core/shell nanocrystal quantum dots. The two techniques provide complementary information on the electronic structure o…
XANES study of Li-MgO and Li-La2O3-MgO catalysts for oxidative coupling of methane
To characterize the defect sites in the near-surface and bulk phase of Li-MgO and Li-La2O3-MgO, XANES at Mg K-edge and La L3-edge was applied. For Li-MgO, it can be suggested that Li doping at a low content (2.5 wt%) brings about the formation of defect species only in the near-surface. This is due to the localization…
Thermo-Oxidative Stability of High Performance Composites under Thermal Cycling Conditions
Thermo-oxidative stability of high performance composites was investigated under thermal cycling conditions between room and 177°C curing temperature. For the analysis of thermal cycling experimental results, an equivalent cycle time (ECT) was developed by applying degradation-reaction kinetic theories to thermal-cycl…
Iodine L-edge XAFS study of linear polyiodide chains in amylose and α-cyclodextrin
We performed iodine L edge XAFS measurements on blue-black amylose-iodine complex to obtain information about the electronic and geometrical structures of polyiodide chain included in amylose helix. Measurements were also carried out on crystalline alpha-cyclodextrin-iodine complex (alpha-cyclodextrin)2 x Cd0.5 x I5 x…
Electrooxidation of Methanol and Formic Acid on Platinum Dispersed Polypyrrole Electrodes
The present study was performed in order to investigate the electrocatalytic properties of platinum incorporated polypyrrole films for methanol and formic acid oxidations. The behaviour of this modified electrode was characterised in acidic media (0.1M HClO4). The electrodes exhibited excellent long-term stability in…
Crystallization Studies of LLDPE during Tubular Blown Film Processing
Abstract The final physical properties of semi-crystalline blown films are highly dependent on the crystalline morphology and orientation of polymer chains within the film. Simultaneous on-line SALS (Small Angle Light Scattering) and IR (Infrared) temperature measurements were successfully used to study crystallizatio…
Surface of Silica Glass Reacting with Silicon Melt: Effect of Raw Materials for Silica Crucibles
The density of brownish spots formed on the surface of silica glass through the reaction with silicon melt is studied using three types of silica glass, that are made from natural quartz powder, synthetic silica powder, and Al-doped synthetic silica powder. The density of the brownish spots was higher in natural quart…
Thermal Degradation of Green and Upgraded Flax Fibres
Over the last couple of years, an increasing amount of research has been dedicated to the use of flax fibres as an environmentally friendly alternative to glass fibres in engineering composites. Because of the relatively poor thermal stability of flax fibres compared to glass fibres, knowledge of the thermal degradati…
XANES study on Ruddlesden-Popper phase, Lan+1NinO3n+1 (n = 1, 2, and ∞)
Ruddlesden-Popper phase, La(n+1)Ni(n)O(3n+1 (n=1, 2, and infinity) compounds were prepared by citrate sol-gel method. We revealed the origin of the variation of the electrical conductivities in La(n+1)Ni(n)O(3n+1 (n=1, 2, and infinity) using resistivity measurements, Rietveld analysis, and X-ray absorption spectroscop…
Photodegradation of SiO<SUB>2</SUB>-Coated CdS Nanoparticles within Silica Gels
A comparative study of the photodegradation of CdS nanoparticles coated with silica shells dispersed in water and embedded in two silica gels with different pore size is presented. Although encapsulation of the quantum dots in a silica shell previously was proven to provide a basically permanent protection against lig…
Foaming of Thermoplastic Elastomers with Water
We present results on foaming of a thermoplastic elastomer (TPE) using water as the physical blowing agent. The TPE is a blend of polypropylene and fully crosslinked EPDM rubber made by a dynamic vulcanization process. The influence of the blowing agent content, and the processing conditions on foam density, cell nucl…
Minimizing Errors in Electron Microprobe Analysis
Errors in quantitative electron microprobe analysis arise from many sources including those associated with sampling, specimen preparation, instrument operation, data collection, and analysis. The relative magnitudes of some of these factors are assessed for a sample of NiAl used to demonstrate important concerns in t…
Smectite stability in acid salt solutions and the fate of Eu, Th and U in solution
Abstract The alteration and transformation behaviour of Ceca smectite in two acid and saline solutions (NaCl and KCl) was studied in batch experiments. This type of smectite is proposed as potential backfill material for nuclear waste storage sites. The initial solution was enriched with 500 ppm of U, Th and Eu. The e…
Using EIS to study the electrochemical response of alloy AA5083 in solutions of NaCl
The corrosion behavior of alloy AA5083 in aerated solutions of NaCl has been studied. Special attention has been paid to the analysis of the electrochemical response of this alloy using Electrochemical Impedance Spectroscopy (EIS). Analysis of the obtained data has enabled an evaluation of the contributions made by ea…
Modification of Poly(maleic anhydride-co-styrene) with Hydroxyl Containing Compounds
Soluble and cross-linked poly(maleic anhydride-co-styrene) copolymers were reacted with hydroxyl containing compounds such as salicylic acid, 2-phenyl ethanol, eugenol and paracetamole in acetone or dioxane solution at 50-80°C. The hydrolytic and controlled release behavior of the copolymers containing these compounds…
The Influence of Molecular Architecture and Solvent Type on the Size and Structure of Poly(benzyl ether) Dendrimers by SANS
The size of poly(benzyl ether) dendrimers with different molecular architectures was measured by small angle neutron scattering (SANS). Both polar and non-polar solvents were used to measure the effect of solvent type. The radius of gyration (Rg) of all of the dendrimers follows a scaling law of Rg ∝ M1/3 consistent w…