Materials Literature
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Abstract Blends of polypropylene with silver particles of controlled morphology are performed to elaborate polymer‐metal conductive composites which can present a PTC effect to be used for a specific current limited function. The samples present quite low percolation threshold around 22% in volume of Ag and a resistiv…
This study uses the torsional split-Hopkinson bar to investigate the dynamic shear deformation and fracture behaviour of Ti–6Al–4V alloy under strain rates of 1800, 2300, and 2800 s −1 at temperatures ranging from −100 to 300 °C. It is found that both the strain rate and the temperature have a strong influence on the…
Copper interconnect electromigration (EM) was examined in various structures and three low- k materials ( k =2.65–3.6) using advanced back-end-of-line (BEOL) technology. Various structures for testing were designed to identify the EM failure modes, and extensive failure analysis was carried out to reveal failure in th…
SOFC-MGT hybrid power plants are a very attractive near term option, as they achieve efficiencies of over 60% even for small power outputs (200-400kW). The SOFC hybrid systems currently developed are fuelled with natural gas, which is reformed inside the same stack at about 800-900°C. However, the use of alternative f…
La johnsenite-(Ce), de composition ideale Na 12 (Ce,La,Sr,Ca,□) 3 Ca 6 Mn 3 Zr 3 W (Si 25 O 73 ) (CO 3 )(OH,Cl) 2 , est un nouveau membre du groupe de l'eudyalite, decouvert au mont Saint-Hilaire, Quebec; il s'agit de l'analogue tungstenifere de la zirsilite-(Ce). Elle se presente en cristaux squelettiques fortement c…
Nanocomposites of polyoxymethylene (POM) and organo-modified montmorillonite were obtained by melt mixing method and investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and mechanical testing, respectively. The XRD resul…
In this paper, the response of sandwich panels (Glass/Epoxy/PU Foam) to projectile impact in the velocity range of 30—100 m/s was studied. Three sets of sandwich plates (WRM/Epoxy/Foam, CSM/Epoxy/Foam, and WRM/CSM/Epoxy/Foam) were used. A piston-type gas gun setup was used to accelerate a cylindro-conical mild steel p…
Rosana G. Moreira, Editor-in-Chief; Texas A&M University
An investigation into the complex dielectric permittivity of nematic liquid crystal (NLC) on homogeneous (or planar, molecular director axis parallel the surface of the cell) and homeotropic (molecular director axis perpendicular the surface of the cell) alignments led to the conception of special equivalent electric…
In this paper, Au -loaded TiO 2 ( Au/TiO 2 ) photocatalysts were prepared by photochemical deposition method and characterized by transmission electron microscopy, diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The results indicated the metallic Au nanoparticles were deposited on the surface of…
The interaction of water-soluble cationic 5,10,15,20-tetrakis(4- N -methyl pyridyl) porphyrin (H 2 TMPyP4) with some mono-and polynucleotides is studied by time-resolved and steady-state fluorescence spectroscopy, as well as by steady-state absorption spectroscopy. The fluorescence decay kinetics are analyzed by recon…
The adhesion of polyvinylamine to wet cellulose was significantly enhanced by the presence of pendant phenylboronic acid groups. It is proposed that adhesion results from boronate ester formation with cellulose at pH > 8. Experiments with phenol derivatized polyvinylamine gave low adhesion supporting the fact that the…
The photoinduced non-linear optics effects in the TEA-CoCl 2 Br 2 nanocrystallites incorporated into the photopolymer olygoetheracrylate matrices were investigated. The temperature dependence of the photoinduced second harmonic generation demonstrates a remarkable dependence on temperature near the phase transitions.…
In this paper an electrochemical cell is developed to test and follow-up the quality of electrodes made of knitted, woven and non-woven conductive textile material. This cell is constructed of two electrodes planarly positioned against each other using a series of PVC plates. The obtained impedance, as a result of app…
A comprehensive review of the roles played by the airflow, wetting and spin finish on the air-jet texturing process is given. The results of an experimental investigation of the air-jet texturing process using residual spin finish, yarn-to-yarn static and kinetic friction, filament strength, filament diameter, and on-…
Abstract The synthesis of polystyrene chains covalently bound to the surface of cross‐linked rubber particles from recycled tires (ground tire rubber, GTR) was investigated via free radical polymerization in situ by using azobisisobutyronitrile (AIBN) and dibenzoyl peroxide (BPO) as initiators. Indeed, the graft polym…
We describe and characterize a multichannel modular room temperature photoluminescence spectroscopy system. This low cost instrument offers minimization of size and complexity as well as good flexibility and acceptable spectral resolution. The system employs an efficient flexible front end optics and a sensitive spect…
We present new results of experimental investigations of azimuthal director reorientation dynamics for a nematic liquid crystal on solid substrates. Two types of substrate with weak anchoring were studied: glass/polystyrene and glass/UV‐activated dye. Slow and fast relaxation processes were observed in both cases unde…
Motivated by the industrially important processes of blade coating and cavity filling of liquid crystalline materials, we consider steady, two-dimensional shear-driven (Couette) and pressure-driven (plane Poiseuille) flow of a thin film of a nematic liquid crystal in the slowly varying channel formed between a fixed b…
Abstract The application of the generic name Fragilaria has remained uncertain because the identity of the lectotype, Conferva pectinalis O. F. Müll., is unknown. Traditionally Fragilaria capucina Desm. has been considered a synonym of F. pectinalis, although this synonymy has not been confirmed. Application of the ge…