Materials Literature
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Abstract Flashover of polluted insulators is still a serious threat to the safe operation of a power transmission system. Despite the extensive investigations carried out on the pollution performance of the insulators, the flashover characteristics are not well understood. Recent theoretical and experimental research…
We have performed electroabsorption spectroscopy on micelle-wrapped single-wall carbon nanotubes. In semiconducting nanotubes, many oscillating structures composed of the increase and decrease of absorption are observed in the spectra in the region of the first and second absorption bands, E11 and E22. The spectral sh…
Due to the ever-increasing awareness of the need for environmental protection, research involving magnesium oxychloride (MOC) Sorel cement has been the subject of increasing interest recently. The sporadic and inconsistent evidence of acicular crystals in the MOC phases has, however, puzzled researchers performing mic…
A comprehensive kinetic investigation of the esterification of acetic acid with methanol in both the liquid phase (21−60 °C) and the gas phase (100−140 °C) was carried out using tungstated zirconia (WZ) as the catalyst. The goal of this study was to derive rate law expressions and to propose a reaction mechanism that…
The electronic structure and the current profiles of $n$- and $p$-doped graphene ribbons are investigated within the Keldysh--Green's function method in the tight-binding framework. The low energy spectrum, at the heart of the relativisticlike quantum transport, is studied numerically and relevant features are underst…
Abstract EPDM‐ graft ‐methyl methacrylate and styrene (EPDM‐ g ‐MMA‐St) was synthesized by solution graft copolymerization of methyl methacrylate (MMA) and styrene(St) onto ethylene‐proplene‐diene terpolymer (EPDM) in toluene/ n ‐heptane cosolvent using benzoyl peroxide as an initiator. Fourier transform infrared spec…
Silica nanostructured spheres were obtained by spray drying of silica sol prepared in situ. Their morphologies were significantly affected by the aggregation of the primary particles in the sol. They had the mode of the pore sizes which was about the same order as Laser Particle Size Analyzer (LPA) diameter. Increasin…
Abstract An evaluation of degraded level is an important subject for industrial products. Ordinarily, many kinds of polymer material changes its color through the degrading process by altering its chemical structure, and IR and UV are applicable to ensure the production of the functional groups. However, these methods…
Abstract Melt rheological properties of high density polyethylene and poly(ethylene terephthalate) (HDPE/PET) blends compatibilized by an ethylene–butyl acrylate–glycidyl methacrylate terpolymer (EBAGMA) were studied by means of a HAAKE torque rheometer and a capillary rheometer. The phase morphology of the blends was…
Abstract The local structure of tungsten species in tungsten–zirconium–oxide catalysts (WO x ZrO 2 ) was first investigated by W K‐edge x‐ray absorption spectroscopic techniques. A proportion of WO 4 to the total WO x species was quantitatively analyzed with W L 1 ‐edge x‐ray absorption near edge structure (XANES). T…
The early emission of streamers in laboratory long air gaps under switching impulses has been observed to reduce the time of initiation of leader positive discharges. This fact has been arbitrarily extrapolated by the manufacturers of early streamer emission devices to the case of upward connecting leaders initiated u…
First- and second-generation dendrimers (Ru3 and Ru6) have been synthesized, and their photophysical properties were investigated in solution and when adsorbed on the nanocrystalline TiO2 surface. The performance of Ru3 and Ru6 as charge transfer photosensitizers in nanocrytalline TiO2 based solar cells was also inves…
Abstract Interfacial polycondensation of diphenolic acid (DPA) and isophthaloyl chloride (IPC) in various solvent/water systems was investigated with tetrabutyl ammonium chloride as a phase transfer catalyst. It was found that a large mass of capsules were formed at the beginning of the reaction for all solvents exami…
The objectives of this research are to demonstrate the feasibility of using the cost-effective pultrusion process to manufacture high quality polymeric composites using natural fiber reinforcements (NFR) and to quantify mechanical property variability for these composites. Natural fiber reinforcements offer value adde…
Abstract Composite samples were prepared from Poly(vinyl chloride)/low‐density polyethylene (PVC/LDPE) blend, compatibilized by PA20 (methyl methacrylate‐ co ‐butyl acrylate copolymer), and reinforced by different levels of rubber‐wood sawdust. To improve the mechanical properties of the composites, Silane A‐137 (Octy…
Undoped and transition-metal doped indium tin oxide films have been grown by pulsed laser deposition technique, on single crystalline c-plane (0001) and r-plane (1102) sapphire substrates maintained at 500–850°C. Magnetization measurements of films deposited at different temperatures indicate that ferromagnetism appea…
Abstract Novel biocomposites have been prepared by the free radical polymerization of a tung oil‐based resin using spent germ, the coproduct of wet mill ethanol production, as a filler. The effect of filler particle size, amount of filler, amount of crosslinker, and molding pressure on the resulting composites has bee…
Udgivelsesdato: MARCH 2008
The electronic local density of states (LDOS) of single PbSe quantum dots (QDs) and QD molecules is explored using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Both individual PbSe QDs and molecular aggregates of PbSe QDs (dimers, trimers, etc.) are mechanically stabilized in a two-dimen…
Abstract Molecular simulations are the most important tools to predict the properties of polymers and their blends. In this work, we have predicted the blend incompatibility of poly( n ‐vinyl pyrrolidone) (PVP) and poly(bisphenol‐A‐ether sulfone) (PES). Atomistic simulations were performed to compute the Flory‐Higgins…