Materials Literature
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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…
In this study, the surface chemical properties of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) grown by catalytic decomposition of methane on nickel and cobalt based catalysts were studied by DRIFT (Diffuse Reflectance Infrared Fourier Transform) and transmission Infrared (IR) spectroscopy. The results show th…
We investigated the atomistic and electronic structure of the 90\ifmmode^\circ\else\textdegree\fi{} domain wall in $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$ and the fundamental mechanism of domain switching induced by shear stress using first-principles density functional theory calculations within the local density ap…
Abstract The present investigation deals with the mechanical, thermal and viscoelastic properties of ternary composites based on low density polyethylene (LDPE)‐ethylene–propylene–diene terpolymer (EPDM) blend and high density polyethylene (HDPE)‐EPDM blend reinforced with short jute fibers. For all the untreated and…
The present work addresses a market demand for high refractive index ( n D ) coatings. We prepared organic UV-curable oligomers with n D > 1.6. We found a novel way to prepare sulfur-containing UV-curable high n D oligomers of melamine and urethane acrylates. Refractive indices of the synthesized oligomers were betwee…
Strategies to create thin films using layer-by-layer methods use oppositely charged polymeric polyelectrolytes for both or at least one component to beneficially exploit multitopic electrostatic interactions between the deposited layers with opposite charges. In contrast, the electrostatic deposition of tetracationic…
Folding under pressure: High-pressure crystallography of an Mn6 single-molecule magnet reveals dramatic changes in the intramolecular geometry of the magnetic core (see picture; Mn purple, O red, N blue). These structural changes effect the magnetic properties of the molecule: the magnitude of the ferromagnetic exchan…