Materials Literature
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Bimetallic nanoparticles often turn out to be superior to the corresponding monometallic systems with respect to their catalytic properties. To study such effects for the methanol decomposition reaction, model catalysts were prepared by physical vapor deposition of Pd and Co under ultrahigh-vacuum (UHV) conditions. Mo…
Abstract In this study, crystal silver nanoparticle clusters, prepared by the reduction of AgNO 3 in the presence of third‐to‐sixth‐generation dendrimers with a trimesyl core, were characterized with ultraviolet–visible spectroscopy, transmission electron microscopy, and energy‐dispersive X‐ray spectroscopy. The resul…
We have observed an anomalous photovoltaic effect in films of Si nanocrystals embedded in SiO2. Using conductive-probe atomic force microscopy and global transport measurements, we found, close to the percolation threshold of the Si crystallite phase, a large photovoltaic effect of up to about 7V. Following the depend…
During a study of the phase stability and decomposition behaviour of the commercial superalloy GTD 111 after many hours in service, it was noted that a lath or plate-like phase precipitated intragranularly. This phase was characterized using electron diffraction and energy dispersive spectroscopy. It was found to be h…
Abstract Tributylphosphate, an organophosphate, was used as the phosphorus source instead of phosphoric acid to synthesize several new multiwalled, microporous rare‐earth phosphate nanofibers and nanotubes. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Abstract Two Vanadium‐substituted Keggin‐type polyoxometalates, K 3 H 2 [α‐SiVW 11 O 40 ]⋅6H 2 O (SiVW 11 ) and K 4 H 2 [γ(1, 2)‐SiV 2 W 10 O 40 ]⋅4H 2 O (SiV 2 W 10 ) were first successfully immobilized on 4‐aminobenzoic acid modified glass carbon electrodes respectively by layer‐by‐layer assembly with poly (ethyleni…
Abstract Nylon 6 is used as a reinforcing material in different rubber products. However, as it is a thermoplastic material, it may undergo some kind of thermal shrinkage during the vulcanization of rubber, which leads to dimensional stability problems in the rubber product. To prevent this, we subjected nylon 6 to so…
Slow time-dependent fluctuations, or noise, in the electrical resistance of dc magnetron sputtered thin films of nickel-titanium shape memory alloys have been measured. Even in equilibrium, the noise was several orders of magnitude larger than that in simple diffusive metallic films and was found to be nonmonotonic ar…
Abstract Graft copolymerization of ethyl acrylate/acrylamide onto corn starch using potassium permanganate–citric acid initiation system was investigated. Major factors affecting the polymerization reaction were thoroughly investigated in terms of initiator concentration, monomer concentration, polymerization time, po…
Magnetic properties of a Heisenberg diamondlike spin chain model for purely organic molecule-based ferrimagnets are investigated by means of the many-body Green's function method within random phase approximation. The molecule-based ferrimagnet is composed of S=1 biradical and S=1/2 monoradical molecules alternating w…
Schottky barrier heights of metal (Al, Au, Ni, and Pt) contacts on boron (B)-doped (111) homoepitaxial diamond films are investigated as a function of surface oxidation treatments before metal deposition [after wet-chemical oxidation (WO), WO followed by annealing in Ar atmosphere (WO-AN) and air oxidation]. It is fou…
Abstract A new strategy to introduce metallic dopant into ZnO structures by a wet chemical reaction is presented. Single‐crystal Er‐doped ZnO flower‐like structures have been synthesized on ZnO‐coated silicon substrate by a low temperature hydrothermal process. The Er‐doped ZnO structures exhibit promising 1.54 μm pho…
One-dimensional (1D) nanoscale “crystalline-amorphous” carbon heterojunction is fabricated by post-treatment of an amorphous carbon nanofiber in a spark plasma sintering (SPS) system. It is proposed that the unique SPS process is responsible for the heterojunction formation. Studies of the electrical transport propert…
Abstract Binary polyamide 66 nanocomposites containing 2 wt % organoclay, polyamide 66 blend containing 5 wt % impact modifier, and ternary polyamide 66 nanocomposites containing 2 wt % organoclay and 5 wt % impact modifier were prepared by melt compounding method. The effects of E‐GMA and the types of the organoclays…
Abstract In the present study, the effect of gamma and electron beam (EB) irradiation on the thermal and mechanical properties of high crystalline polypropylene (HPP) was studied. To study the structural modifications of HPP polymer which could occur following these treatments at different doses (20, 40, 60, 80, 100,…
The structures of eight related known intermetallic structure types are the impetus to this paper: Li21Si5, Mg44Rh7, Zn13(Fe,Ni)2, Mg6Pd, Na6Tl, Zn91Ir11, Li13Na29Ba19, and Al69Ta39. All belong to the F43m space group, have roughly 400 atoms in their cubic unit cells, are built up at least partially from the gamma-bra…
The effects of polygermanium interlayer, acting mainly as heating and thermal-resisting one, on performance of phase change memory are studied. Thermal simulation shows that the maximum temperature in Ge2Sb2Te5 layer is remarkably promoted when Ge2Sb2Te5 is capped between polygermanium layers. The maximum temperature…
Abstract The mineral wheatleyite has been synthesised and characterised by Raman spectroscopy complimented with infrared spectroscopy. Two Raman bands at 1434 and 1470 cm −1 are assigned to the ν (CO) stretching mode and implies two independent oxalate anions. Two intense Raman bands observed at 904 and 860 cm −1 are…
Abstract ZrO 2 ‐Al 2 O 3 Bragg reflectors for future application in ZnO based resonators grown by pulsed laser deposition on c‐plane sapphire and silicon substrates show a reflectivity up to 99.8% with a layer pair number of 12.5. Layer thicknesses obtained from standard ellipsometry agree very well with thicknesses o…
Abstract In‐situ spectroscopic ellipsometry was used to evaluate the temperature behaviour of chitin and chitosan thin films. For both biopolymers it was found that film thickness decreases with temperature. Two different linear rates were clearly identified by a characteristic temperature T c , of 51 and 59 °C for ch…