Materials Literature
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TiO 2 -supported transition metal oxides (Mn, Cr, and Cu) for the SCR of NO with NH 3 have been synthesized by wet impregnation. The adsorption and coadsorption of NH 3, NO, and O 2, in conjunction with in situ FT-IR spectroscopy, was used to elucidate the reaction mechanism as the samples were heated from 323 to 673…
Possible variations in the dynamical behaviour of LiYF$_{4}$ due to its structural changes following several pressure-induced phase transitions are examined by making use of the complementary techniques of quasi-harmonic lattice dynamics and molecular dynamics simulation. The phonon spectra in the entire Brillouin zon…
The growth of ordered nanorods of mesoporous SBA-15 inside a porous alumina membrane has been achieved for the first time by a simple sol-gel method. The obtained SBA-15 nanorods themselves have ordered hexagonal mesochannels with a size of about 6 nm and have been arranged to form hexagonal arrays by the limitation o…
Short gold nanorods of average lengths ranging between 20 and 100 nm (with corresponding aspect ratios of 2 and 4) were synthesized in excellent yield (approximately 97%). These nanorods were characterized by dark-field microscopy, UV-visible spectrophotometry, and transmission electron microscopy. Temporal evolution…
Crystalline silicon being ubiquitous throughout the microelectronics industry has an indirect bandgap, and therefore is incapable of light emission. However, strong room temperature visible and near-IR luminescence from non-crystalline silicon, e.g., amorphous silicon, porous silicon, and black silicon, has been obser…
Ca films deposited on the surface of Pd(111) were studied by temperature-programmed desorption, X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy, and low-energy electron diffraction (LEED). Multilayer Ca films desorb at 1180 K, which is much higher than that value for any of the alkali metals. Ca ad…
Abstract Summary: Polyaniline doped with camphorsulfonic acid (PANI‐CSA) and ethylcellulose (EC), constitutes the basis of the investigated binary PANI(CSA) 0.5 / m ‐cresol and ternary PANI(CSA) 0.5 /EC/ m ‐cresol solutions. Ternary solutions give rise to gels with a lower elastic modulus and electrical conductivity t…
The thermal dehydration of Mn2P2O7·2H2O was studied, in the range 25–600°C by thermogravimetric analysis (TG-DTG and DSC), x-ray diffraction, and infrared spectroscopy. According to the (TG-DTG and DSC) curves, the dehydration of this salt takes place in two stages. The results of thermal analysis, x-ray patterns, and…
Different vanadium loadings, viz., 3, 4, 6, and 8 wt %, have been supported on mesoporous carbon-coated monoliths. These catalysts have been tested in the SCR of NO at low temperature. Experiments with different monolith configurations and area velocities have been performed. The conversions of the monoliths placed in…
We present a new time-of-flight spectrometer for energy and angle-resolved measurements of electrons emitted in coincidence from a surface. By using a projection method, we can cover nearly 2π of the solid angle above the sample resulting in a very high coincidence efficiency. The use of this new spectrometer for the…
In this paper, we investigate the potential of ultrasonic energy in a flow crystallization situation, which was designed to mimic the industrial process, in which dextrose monohydrate is in a flow environment before it finally passes into the batch crystallizer where it is slow cooled. In this study, we were specifica…
A series of soluble, fully aromatic polyetherimides were prepared as candidate materials for optical coating applications. Most of the new polymer coatings possessed high transparency in the optical and near-infrared spectral regions at thicknesses ranging from 1 to 10 microns. The refractive indices obtained ranged f…
Spin polarized inverse photoemission is a powerful but demanding technique for investigating the interplay between surface magnetism and the spin polarized electronic structure of unoccupied states. We have developed a compact apparatus five times more efficient than similar existing systems, with a sizable reduction…
We have demonstrated operation of an all-optical liquid crystal (spatial light modulator) used for steering a laser beam over large angles. Continuous steering over ±12.4° is achieved, controlled by the power of an infrared pump beam; This is a very large steering angle for a nonmechanical nondiffractive system.
Most carbon nanotube transistors work as Schottky barrier transistors. We show that chemical treatment of operational p-type nanotube transistors by trifluoro-acetic acid (TFA) leads to the drastic improvement of all the key device parameters. This effect is due to the highly polar nature of the TFA molecule which, on…
Epitaxial PbTiO3 thin films of various thicknesses were prepared by pulsed laser deposition on Pt(001)/MgO(001) substrates. Their ferroelectric domain structures and switching behavior were then investigated mainly using scanning force microscopy as a function of film thickness. Direct evidence of a-domain switching w…
Piezoresponse force microscopy (PFM) technique has been utilized to study the evolution of domain structure with varying Pb(Zr,Ti)O3(PZT) thickness on GaN substrate. Sol-gel PZT films were deposited on the GaN∕sapphire substrate with PZT thickness of 100, 200, and 300nm. The films exhibit ferroelectric properties that…
Abstract Summary: A series of organic‐inorganic nanoparticles were synthesized by nitroxide‐mediated polymerization (NMP) of butyl acrylate initiated by a self‐assembled monolayer of an azo initiator. The azo initiator was immobilized on silica particles in the presence of a stable nitroxide radical, SG1 (an acyclic β…
Deposition of a hydrothermal method has a number of advantages; low deposition temperature, high-purity, deposition on a three-dimensional structure, and a large thickness. The present paper investigates the improvement of an epitaxial lead zirconate titanate (PZT) thin film deposited via hydrothermal synthesis. The c…
The crystal structure of polyhedral graphite particles (“G balls”) has been investigated under pressure up to 43 GPa and at room temperature by x-ray powder diffraction measurements. The polyhedra maintain the graphite phase under pressure higher than 40 GPa. A 29% compression in volume at 43 GPa involves an unusual d…