Materials Literature
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We investigated the adsorption of hydrogen peroxide molecules on Fe-filled single-walled carbon nanotubes (SWNTs) based on density functional theory (DFT) calculations. The adsorption possibilities for the hydrogen peroxide molecule were tested by finding the minimum energy as a function of distance of the molecule fr…
Vanadium dioxide is insulating below 340 K in experiments, whereas the band structure calculated in the local density approximation (LDA) is gapless. We study the self-energy effects using the ab initio GW method. We found that the self-energy depends strongly on the energy, and proper treatment of the dynamical effec…
We present a theoretical study of the structural and optical properties of tripeptide-silver cluster hybrid systems which shows that silver clusters induce significant absorption enhancement in the spectral region between 225 and 350 nm with respect to the pure peptide. This allows the use of clusters as chromophores…
Conducting polymers (CPs), such as polypyrrole, polythiophene, and polyaniline, are unique in that they have switchable properties due to their two or more mechanically stable oxidation states.Thus, their films or coatings can be easily switched by the application of a small voltage and current to change their volume…
Applying a combination of traditional fluorescence correlation spectroscopy and antibunching measurements to solutions of nanocrystal quantum dots (NQDs), we can reliably establish the regime where only one dot or less is present in the detection volume. Under these conditions, it is possible to probe various photophy…
We propose a new class of resonant electromagnetic structures, and study their response to free-space illumination. The structures consist of partial cylindrical shells that have the cloaking material properties proposed by Pendry et al. [Science 2006, 312, 1780]. These metamaterial shells have apertures that allow th…
TiO(2) nanocrystals were synthesized by a hydrolysis method combined with a thermal treatment. TiO(2) nanocrystals with rutile and anatase structure were selectively synthesized by controlling the pH level in the precursor solution, and the crystallite size was controlled by changing the reaction temperature. Moreover…
Nanorods composed of carbon nanoflakes have been synthesized via catalytic decomposition of benzene at temperatures as low as 350 °C over Ni nanoparticles derived from sol−gel synthesis followed by hydrogen reduction. Field-emission scanning electron microscopic and high-resolution transmission electron microscopic im…
We use light microscopy to investigate the aging dynamics of a glass made of closely packed soft spheres, following a rapid transition from a fluid to a solidlike state. By measuring time-resolved, coarse-grained displacement fields, we identify two classes of dynamical events, corresponding to reversible and irrevers…
A new catalyst support, nickel foam, was suggested for use in a microcatalytic combustor. Al2O3 was coated on nickel foam to increase the surface area using a coating slurry prepared by a modified sol-gel process. Rough surface was observed in the SEM examination of Al2O3-coated nickel foam. H2 catalytic combustion wa…
Spray coating method is a cost-effective technique suitable for the preparation of uniform and large-area thin films. This article presents findings on the preparation of dense electrolyte thin films by spray coating method. Dense, crack-free Gd-doped CeO2 (GDC) thin films with a thickness of approximately 2 µm were s…
The binary mixture of 4-n-pentyl phenyl 4-n'-hexyloxy benzoate (ME6O.5) and p-cyanophenyl trans-4-pentyl cyclohexane carboxylate (CPPCC) shows the presence of an induced smectic A(d) phase in a certain concentration range 0.03<x(CPPCC)<0.6. The results of the differential scanning calorimetry (DSC), refractive indices…
Six-fold core-shelled three-dimensional hierarchical structures were prepared by a direct annealing process. The effect of experimental parameters on density and length of branches of hierarchical Zn/ZnO structure is discussed. The influence of oxide layer formation and the shape of Zn polyhedron on the relaxation of…
but there has been no other report ever since.Porous anodic aluminum oxide (AAO) membrane has been frequently used as template for the formation of nanorod arrays. Among the various deposition techniques, the electro-chemical deposition has been proven to be an efficient and low-cost technique for the formation of nan…
Zn(1-x)Co(x)O samples were prepared by a standard solid-state reaction method. Zn(1-x)Co(x)O crystals in the wurtzite structure were obtained with a Co composition of up to 22.1%. The a- and c-axis lengths increased and decreased, respectively, with an increase in Co composition. Raman spectra showed systematic broade…
Hexagonal YbMnO(3) bulk polycrystals were prepared and studied by Raman scattering in the temperature range of 15-300 K. A total of 15 phonon modes of A(1), E(1) and E(2) type were identified. Some E(2) phonon modes showed anomalous temperature variations in frequency at T(N)∼80 K, suggesting a coupling between the sp…
The term microstructure defines many properties of metals that have practical significance.The final microstructure established during metal-forming processes is determined by the grain growth, recrystallization and recovery phenomena.Since these phenomena represent stochastic processes, they require a statistical tre…
NiTi shape memory alloy was anodized in diluted hydrogen fluoride. Surface morphologies and compositions of modified NiTi wires were characterized by using scanning probe microscopy (SPM), field-emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectroscopy (EDS) and x-ray photoelectron…
A microscope-CCD setup has been developed as an analytical tool for the detection of diffraction from one-dimensional redox-active transition-metal oxide gratings prepared with a combination of microtransfer molding (microTM) and cathodic electrodeposition. The diffraction efficiencies (DE) of tungsten trioxide, WO3,…
Molecular dynamics computer simulations have been carried out in the smectic- A phase of stiff wormlike rods. The analysis of the long trajectories generated has allowed for a detailed insight into that diffusion mechanism which is operative in the above-mentioned liquid-crystalline phase, as recently visualized in a…