Materials Literature
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The local environment around magnetic impurity atoms was reported to be unchanged in a structural phase transition of nanocrystalline Co-doped ferromagnetic ${\mathrm{TiO}}_{2}.$ Our ab initio density functional theory investigations show that the substitutional Co ions incorporated into ${\mathrm{TiO}}_{2}$ rutile te…
Rare earth ions; Nd, Sm, Gd, and Dy, are substituted at the bismuth site in bismuth iron titanate, a four-layered compound which belongs to bismuth layer structured ferroelectrics. A solid-state sintering route was adopted in synthesizing the materials. X-ray diffraction indicates the formation of single-phase materia…
Ab initio electronic structure calculations based on density functional theory are performed for ${\mathrm{Si}}_{n}\mathrm{Fe}$ clusters to determine stable structures. Our results show that these clusters can form the building block for Fe-encapsulated Si-nanotubes. The ${\mathrm{Si}}_{10}\mathrm{Fe}$ and ${\mathrm{S…
We present the self-interaction corrected local spin density (SIC-LSD) electronic structure and total energy calculations, leading also to Fe valencies of the ground state configurations, for the double perovskites such as ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6},{\mathrm{Ba}}_{2}{\mathrm{FeMoO}}_{6},{\mathrm{Ca}}_{2}{\…
Polarization dependences of Rayleigh and surface-enhanced Raman scattering (SERS) were measured for individual Ag nanoparticles on which Rhodamine 6G molecules were adsorbed. It was found that the polarization dependencies of surface plasmon bands generated by the aggregation of SERS active Ag particles are well synch…
Microtubule sensors for glucose, urea, and triglyceride were fabricated based on poly(styrene sulfonate)-polyaniline (PSS-PANI) composites synthesized within the pores of track-etched polycarbonate membranes. The synthesis of a sufficiently thick and conducting PSS-PANI film at pH 5 provided the advantage of immobiliz…
The novel [Co(C5F6HO2)2·2H2O·CH3(OCH2CH2)4OCH3] low-melting adduct has been synthesized and characterized. Very mild heating results in the anhydrous Co(hfac)2tetraglyme liquid and thermal stable complex that evaporates intact. This adduct has proven to be a well-suited precursor for MOCVD of cobalt oxide films.
We derive a general equation for the depletion thickness δ next to a flat wall in a solution of nonadsorbing polymer, which is easily extended to spherical geometry. This equation has the simple form δ -2 = δ 0 -2 + ξ -2 . Here, δ 0 is the value of δ in the limit of infinite dilution, which depends only on the chain l…
We present investigations of Gd-implanted aluminum nitride, studied with cathodoluminescence (CL) as well as time-resolved CL in the temperature range 12–300 K. Luminescence due to intra-4f electron transitions of Gd3+ is dominated by the P7/26→S7/28 transition between the first excited state and the ground state of G…
The effects of anisotropic dielectric properties of ferroelectric Ba1−xSrxTiO3 (BST) films on the characteristics of the interdigital (IDT) capacitors have been studied in microwave regions at room temperature. Ferroelectric BST films with (001), (011), and (111) orientation were epitaxially grown on (001), (011), and…
We report the synthesis of polymer capsules from amphiphilic graft copolymers composed of reactive, hydrophobic polyolefin backbones and hydrophilic poly(ethylene glycol) (PEG) grafts. The capsules are produced by self-assembly of the polymers at the oil-water interface, followed by cross-linking with bis-cyclooctene…
Molecular dynamics (MD) simulation studies of the interface between poly(ethylene oxide) (PEO) and TiO 2 have been performed at 423 K using a quantum chemistry-based force field. MD simulations revealed that the PEO density is significantly perturbed by TiO 2 surfaces, forming layers of highly dense polymer (compared…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTCathode Ray Tube PhosphorsLyuji Ozawa and Minoru ItohView Author Information Consultant, L. L. Technology, Hopewell Junction, New York 12533 Department of Electrical and Electronic Engineering, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan C…
Zeolite Y of mesoporous channels has been synthesized using novel mesoporous carbon aerogels as template. It was characterized with X-ray powder diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis, and nitrogen adsorption/desorption. Th…
The screening properties of dielectric nanocrystals are analyzed. General arguments confirmed by detailed numerical calculations are presented. It is shown how macroscopic components of the electric field can still be defined for sizes larger than a few Fermi wavelengths and can still be obtained from the bulk dielect…
We observed a scaling behavior during the shadowing growth of isolated Si, Co, Cu, and W nanocolumnar structures on Si substrates using the oblique angle deposition with substrate rotation (also known as glancing angle deposition or simply GLAD). The width of the isolated columns, $W,$ grew as a function of column len…
We report detailed studies of the slow relaxation of the photoinduced excess charge carriers in organic metal-insulator-semiconductor field effect transistors consisting of poly(3-hexylthiophene) as the active layer. The relaxation process cannot be physically explained by processes, which lead to a simple or a stretc…
Using the spin-spiral formulation of the tight-binding linear muffin-tin orbital method, the principal components of the exchange stiffness tensor are calculated for typical hard magnets including tetragonal CoPt-type and hexagonal YCo5 alloys. The exchange stiffness is strongly anisotropic in all studied alloys. This…
The use of tetraalkylammonium hydroxides to prepare ZnO colloids with diameters ranging from 1 to 6 nm is described. The position of the first excitonic transition has been measured by UV-vis spectrometry and correlated with the particle size, which has been measured using high-resolution transmission electron microsc…
We discuss methods to map crystallographic textures in crystal plasticity finite element simulations. Fourier-type series expansion methods which use spherical harmonic library functions as well as the direct pole figure inversion methods are not well suited to reproduce texture information in a sufficiently localized…