Materials Literature
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Abstract An ethylene‐propylene‐diene rubber (EPDM), containing 5 wt% 5‐ethylidene‐2‐norbornene, was functionalized with maleic anhydride through the Alder Ene reaction at temperatures above 200°C in a co‐rotating twin screw extruder. Characterization of the maleated product included FT‐IR, 1 H and 13 C NMR, and GPC. T…
Journal Article Measurement of Performances of Aerosol Type Radioactive Contamination Monitors Get access L. Grivaud, L. Grivaud Search for other works by this author on: Oxford Academic PubMed Google Scholar S. Fauvel, S. Fauvel Search for other works by this author on: Oxford Academic PubMed Google Scholar M. Chemto…
Abstract Computer simulation techniques have been used to investigate defect formation and the diffusion of Ca and Mg in diopside. It was found that isolated, non-interacting CaO and MgO Schottky defects had the lowest formation energies (3.66 and 3.97 eV respectively); oxygen Frenkel defects are the most favourable o…
X-ray photoemission measurements of CuCO3 are presented.
Thermal conductivity (at 5 to 300 K), dielectric (at 5 to 250 K) and sound velocity (at 5 to 150 K) measurements have been performed for the first time on ceramic samples of Na0.5Bi0.5TiO3. The data revealed a nearly temperature-independent plateau in thermal conductivity λ(T) at about 7 to 30 K and ≈︂0.2 W/mK. This p…
A theoretical study of the magnetic susceptibility of multilayered carbon nanotubes in fields both parallel, H ∥, and perpendicular, H ⊥, to the tube axis has been carried out disregarding electron-electron interaction. The temperature dependences of the magnetic susceptibility obtained exhibit a nontrivial form for H…
We propose simple configurations to measure the thermoelectric power and the four-probe resistivity simultaneously for different types of samples.
An Inconel 718 based alloy containing only trace amounts of C, S, and P was subjected to thermal cycling in a Gleeble 1500 system to induce microstructural features which are produced in the heat affected zone (HAZ) during welding. In the thermally cycled material many grain boundaries were observed to liquate; howeve…
Nano-MgO particles have been introduced into silver-sheathed tapes fabricated by the rod-in-tube process. It is found that the transport properties of the nano-MgO particle doped sample are noticeably improved compared with those of the undoped sample. The irreversibility line of the MgO-doped sample shifts to higher…
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) and x-ray photoelectron spectroscopy (XPS) are used to characterize a newly synthesized glycosylated photoactivatable reagent designed for surface glycoengineering. The glycoaryldiazirine reagent MAD-Gal (N-[m-(3-(trifluoromethyl)diazirine-3-yl)phenyl]-4-(-3-th…
A synthesis procedure for preparing palm oil fatty acid additives (POFA's) is described. The performance of these acids in carbon black (CB) filled natural rubber (NR) compounds was examined. The incorporation of POFA's is found to improve mechanical properties of CB filled NR compounds, especially below a concentrati…
A solid-state microactuator was studied using volume change due to redox reaction of poly(pyrrole) film. Pyrrole was electropolymerized on a comb-shaped microelectrode array, and the poly(pyrrole) film was covered by a solid polymer electrolyte, polyethylene glycol. The volume change of the poly(pyrrole) film by elect…
We have employed a phase modulation method using a photoelastic modulator to determine the uniformity and quality of the alignment layer of liquid crystals (LCs). It is demonstrated that a two-dimensional map of the phase retardation, associated with irregular rubbing and/or chemical contaminants, provides invaluable…
Stress concentration in ceramic‐matrix composites due to fiber‐matrix fusion is investigated using finite‐element modeling (FEM) in conjunction with experiment. FEM results indicate substantial stress concentration can be expected when the fiber and matrix are locally fused. The focus of the investigation is sealing t…
The irreversible behaviour of the pinning-induced magnetostriction of a cylindrical superconductor placed in a parallel magnetic field, , is analysed. An exact solution of the magneto-elastic problem is found and we present formulas for the deformation, , and the stress distributions, and , valid for any critical-stat…
The crystal structure of a new cubic cristobalite-related sodium aluminosilicate Na 1.45 Al 1.45 Si 0.55 O 4 [ P 2 1 3, a = 14.553 (1) Å] has been modelled using a modulation wave approach and the model tested against X-ray powder diffraction data using the Rietveld method. Owing to there being 64 independent position…
The new compounds K2Au2Ge2S6 (1), K2Au2Sn2Se6 (2), and Cs2Au2SnS4 (3) have been synthesized through direct reaction of the elements with a molten polyalkalithiogermanate(stannate) flux at 650, 550, and 400 °C, respectively. Their crystal structures have been determined by single crystal X-ray diffraction techniques. 1…
A method for the calculation of the transmitted and reflected scalar fields at arbitrary dielectric surfaces is presented. The method is based on an evaluation of the Born series expansion and is of high accuracy as multiple reflections and refractions are taken into account. We show by comparison with Fresnel formula…
Ferroelectric liquid-crystal spatial light modulators (FLC SLM's) are binary modulating devices that can be used for flexible beam steering in the microsecond range. Because they are binary, at least 60% of the light power is lost to unwanted diffraction orders, however. We suggest the use of a second FLC SLM, synchro…
Green and partially sintered compacts of alpha‐Al 2 O 3 powder were made by filtration of aqueous suspensions under three conditions: ( i ) electrostatic stabilization without any organic additive, ( ii ) strong flocculation near the isoelectric point without any organic additive, and ( iii ) weak flocculation by the…