Materials Literature
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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…
Abstract A diamine containing a pendant phenoxy group, 1‐phenoxy‐2,4‐diaminobenzene, was synthesized and condensed with different aromatic dianhydrides [4,4′‐oxydiphthalic dianhydride, 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride, 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride, 3,3′,4,4′‐biphenyltetracorbox…
Keggin-type heteropolyacids have been used as catalyst for high-yielding oxidation reactions in multiphase conditions. This simple and efficient procedure promoted the conversion of anilines to the corresponding nitroso and nitro derivatives. In comparison with homogeneous system the oxidation from anilines to nitroso…
Abstract The effect of silica reinforcement was studied for natural rubber (NR) and butadiene rubber (BR) vulcanizates by a sol–gel reaction with tetraethoxysilane at different temperatures. The formation of silica in the rubber vulcanizates was investigated analytically with Fourier transform infrared spectroscopy an…
We report microphotoluminescence measurements on individually suspended ZnO nanowires attached to nanometer-sized metal tips. This procedure avoids the possible influence of the substrate and enables comprehensive optical, electrical, chemical, and morphological characterizations to be carried on the same individual n…
The best level of ordering and straightening of carbon nanotube arrays is often achieved when they are grown in a dielectric matrix, so such structures present the most suitable candidates for future channeling experiments with carbon nanotubes. Consequently, we investigate here how the dynamic polarization of carbon…
Abstract All of the composites were prepared using Brabender internal mixer (50 rpm, 190°C) and molded using compression mold (190°C) to form test samples. The results showed that the tendency of kaolin particles to agglomerate was too strong, resulting in low strength and rigidity but fairly good toughness. To overco…
Abstract The prism minimum deviation technique has been used to measure the fluid dependence of refractive indices. Fluids with varying ion concentration (0 to 1.0 M) and varying protein concentration (0.01‐10 mg/ml) have been examined and the measurements show that these parameters influence the refractive index valu…