Materials Literature
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Abstract The carbon nanotube/polypropylene conductive composites with a percolation threshold as low as 0.25 wt% were fabricated by solid state alloying. This solid state alloying method uses the super‐high speed mechanical shearing (at 10,000 rpm) to process the entangled catalytically grown carbon nanotubes (CNTs) a…
We propose a scheme of electromagnetically induced left-handedness in a dense atomic vapor medium. By applying an incoherent pump field to manipulate the populations in atomic levels, and a strong coherent field to create quantum coherence, the magnetic part of the probe field can be amplified instead of strong absorp…
The effects of phase separation on the structure and photoconductivity kinetics in Sn(x)Sb(20)Se(80-x) (x = 10,11,12.5) glassy films have been studied. Crystalline peaks for SnSe(2), Sn(2)Sb(4)Se(8) and Sn(4)Sb(4)Se(10) phases are found in x = 12.5 films, while Sb(2)Se(3) is the other major phase revealed from x-ray d…
We introduce a new beam steering concept of the "Risley grating" that consists of independently rotating inline polarization gratings (PGs). The Risley grating concept replaces the bulky prismatic elements of the Risley prisms with thin plates containing polarization gratings, and employs their highly polarization-sen…
Preyssler acid as bulk form, H 14 [NaP 5 W 30 O 110 ] and silica-supported with different loadings used as green, eco-friendly and recyclable photocatalysts for catalytic oxidation of benzyl alcohols to the corresponding aldehyds under O 2 and H 2 O 2 . High selectivity and moderate to excellent yields were obtained.…
Surface structures in micrometer scale were prepared on different substrates by a coating process using particle‐filled slurries based on a blend of preceramic polymers. Parameters like solvent fraction, substrate material, filler particle size, and layer thickness were varied. Demixing reactions of solvent and polyme…
Yttrium orthovanadate (YVO 4 ) nanoparticles with nearly spherical shape were successfully synthesized via a molten salt method at a low temperature of 200°C. The as‐prepared powders were characterized by X‐ray diffraction, transmission electron microscopy and UV‐Vis spectroscopy, respectively. The results show that i…
Cu‐doped CaTiO 3 ‐based polycrystalline ceramics have been prepared by the conventional solid‐state sintering. Our results indicate that the dielectric constant can be enhanced greatly by increasing the Cu‐doped content, which show weak frequency and temperature dependence. The fitted activation energy is almost same…
Abstract Infrared (IR) spectroscopy revealed that dimethyl ether (DME) undergoes partial dissociation on pure and rhodium‐containing CeO 2 at 300 K to yield methoxy and methyl species. This process is promoted by the presence of rhodium. By means of thermal desorption measurements (TPD), the adsorption of DME on Rh/Ce…
A special configuration of white-light scanning interferometer is described for measuring the absolute air gap thickness between two planar plates brought into close proximity. The measured gap is not located in any interference arm of the interferometer, but acts as an amplitude-and-phase modulator of the light sourc…
Preparation of ZnO/organic/ZnO “sandwich” semiconductor hybrid structures by molecular beam epitaxy is reported. Overgrowth of the organic layer becomes possible because ZnO epitaxy requires exceptionally low substrate temperatures. The molecule, a spirobifluorene derivative, withstands ZnO overgrowth without degradat…
Abstract A new implant Ti–7Al–3V–2Mo–2Fe alloy was elaborated and its behaviour in Ringer–Brown and Ringer solutions (of different pH values) was studied using cyclic potentiodynamic and linear polarisation, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) with its link energy disper…
A simple method for the preparation of nanostructured aluminate coatings based on the hydrolysis of aluminum nitride powder is described. The coatings were successfully deposited on a sintered yttria‐stabilized tetragonal zirconia (Y–TZP) ceramic substrate. The nanocrystalline coating formed using this method consists…
A thermally self-sustaining miniature power generation device was developed utilizing a single-chamber solid oxide fuel cell (SOFC) placed in a controlled thermal environment provided by a spiral counterflow “Swiss roll” heat exchanger and combustor. With the single-chamber design, fuel/oxygen crossover due to crackin…
Percolation in colloidal suspensions is sometimes simulated by the random insertion of impenetrable particles into a box. However, configurations generated in this way are not representative of an equilibrated suspension. Here, we quantify the effect of the insertion method on the percolation threshold for systems of…
Abstract Micro and nanocrystalline diamond layers have been deposited on molybdenum substrates by hot‐filament CVD, and tested in the Mega Amp Spherical Tokamak as a protective coating of fusion plasma‐facing materials. The modification of surface properties induced by high density plasma was investigated by SEM, X‐ra…
Low-temperature $(<40\text{ }\text{K})$ photoluminescence (PL) spectra of individual CdSe nanocrystal quantum wires exhibit narrow $(<5\text{ }\text{meV})$ isolated peaks spanning a range $\ensuremath{\le}50\text{ }\text{meV}$. We attribute these features to emission of excitons localized in shallow (a few meV d…
Abstract We present a systematic study of the effects of fullerene nanoinclusions upon a p‐type bismuth–antimony–telluride matrix, where the ultimate goal is maximizing the figure of merit by reducing the thermal conductivity (TC). Nanocomposites consisting of a bismuth–telluride matrix with fullerene inclusions have…
Abstract The ferroelectromagnetic Pb(Fe 0.5 Nb 0.5 )O 3 (PFN) ceramic was synthesized by a powder calcining method. The aim of this work was to decrease the electric conduction of the biferroic PFN ceramic as a result of admixing it with metal oxides or carbonates. Investigation results concerning the influence of adm…
Abstract Unmodified (LDH) and modified (mLDH) layered double hydroxides have been added to gum and ZnO‐cured carboxylated nitrile rubber (XNBR). It was observed that both LDH and mLDH inhibit the formation of ionic cross‐links between XNBR and ZnO quite significantly, as is evident from DMA and FT‐IR studies. The supp…