Materials Literature
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Two asymmetrically substituted porphyrins (5,15-bis(4-nitrophenyl)-10,20-bis(3,4-bis(2-ethylhexyloxy)phenyl)-21 H,23 H -porphine, CAH3; 5,15-bis(4-aminophenyl)-10,20-bis(3,4-bis(2-ethylhexyloxy)phenyl)-21 H,23 H -porphine, CAH4) have been used in this work. Good Langmuir monolayers of these compounds have been prepare…
Water expands upon freezing, has minima in its volume, heat capacity, and isothermal compressibility with temperature, and shows signs of a first-order phase transition when supercooled. We present an analytical molecular theory that can account for these behaviors. It suggests that local network formation and hydroge…
Slow oscillations of the interlayer magnetoresistance observed in the layered organic metal $\ensuremath{\beta}\mathrm{\text{\ensuremath{-}}}(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\mathrm{\text{\ensuremath{-}}}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{2}{\mathrm{I}\mathrm{B}\mathrm{r}}_{2}$ are shown to originate from the…
It is argued that the vacancy–oxygen (VO) complex (A center) in Ge has three charge states: double negative, single negative, and neutral. Corresponding energy levels are located at Ec−0.21 eV (VO−−/−) and Ev+0.27 eV (VO−/0). An absorption line at 716 cm−1 has been assigned to the asymmetrical stretching vibration mod…
BaMgAl 10 O 17 : Eu 2+ (BAM) phosphors used for plasma display panels (PDP) are compelled to be exposed to an oxidizing environment at about 500 °C, which is currently unavoidable in the actual manufacturing process of PDP. We investigated the mechanism of the luminance degradation of BAM caused by the annealing at 50…
Polydispersity is believed to have important effects on the formation of liquid crystal phases in suspensions of rodlike particles. To understand such effects, we analyze the phase behavior of thin hard rods with length polydispersity. Our treatment is based on a simplified Onsager theory, obtained by truncating the s…
Microstructural features evolving in crystalline solids from diffusion-reaction kinetics of mobile components depend crucially on the dimension of the underlying diffusion process which is commonly assumed to be three-dimensional (3D). In metals, irradiation-induced displacement cascades produce clusters of self-inter…
The irreversible decay of the spontaneous polarization above the phase-transition temperature is a limiting factor in any application of ferroelectric crystals. Here we show that electric fields applied at high temperatures induce a preferred direction in the crystal which is stable even after repeated heating and coo…
Using rf magnetron sputtering, we have grown low resistivity (∼3×10−4 Ω cm), high transparency (>80%) indium–tin–oxide thin films with near zero stress on polyester substrates, near room temperature. We concluded from analysis of sputtered ions and atoms that bombardment by energetic (>70 eV) negative oxygen ions caus…
The high-frequency sound velocity ${v}_{\ensuremath{\infty}}$ of liquid water has been determined to densities of $1.37\text{ }\mathrm{g}/\mathrm{c}{\mathrm{m}}^{\mathrm{3}}$ by inelastic x-ray scattering. In comparison to the hydrodynamic sound velocity ${v}_{0}$, the increase of ${v}_{\ensuremath{\infty}}$ with dens…
Silver-silica nanocomposites have been synthesized by an electrodeposition technique. Silver oxide layers have been grown on the silver particles by an oxidation treatment of the nanocomposites in the temperature range 478--653 K. Optical absorption spectra of films of these nanocomposites dispersed in polystyrene wer…
The extraction and separation of transition metals has been investigated using several inorganic adsorbents (silica gel, MCM-41, and aluminum oxide), modified with ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) as chelating ligands. The metal ions in aqueous solution were coordina…
Beam house processes (Beam house processes generally mean liming-reliming processes, which employ beam.) contribute more than 60% of the total pollution from leather processing. The use of lime and sodium sulfide is of environmental concern (1, 2). Recently, the authors have developed an enzyme-based dehairing assiste…
The segregation behavior in 3 and 10 mol % polycrystalline yttria stabilized zirconia (YSZ), calcined at temperatures ranging from 300 to 1600 °C, is characterized using low-energy ion scattering (LEIS). In order to be able to separate the Y and Zr LEIS signals, YSZ samples have been prepared using isotopically enrich…
We studied the effect of ion damage on the properties of 50 keV Ga+ focused ion beam fabricated lead-zirconate-titanate capacitors as a function of the ion dose. We observed significant modification in the chemical composition of the damaged layer due to loss of lead and oxygen, and gallium impurity accumulation. The…
A nanosized decacopper(II) cluster complex was synthesized using p-tert-butylthiacalix[6]arene as a ligand. In the complex, the calixarene assumes a "pinched cone" conformation and acts as an undecadentate ligand via six phenoxy oxygen and five sulfur atoms. The resulting pentacopper(II) subunits are connected by two…
The p-type GaN epilayers were prepared by metalorganic chemical vapor deposition and subsequently Mn+ ions implanted. The properties of Mn+ ions-implanted GaN epilayers were investigated by optical and magnetic measurements. The results of photoluminescence measurement show that optical transitions related to Mn appar…
A lamellar-structured crystalline polypyrrole (PPy) supramolecular assembly was prepared by surfactant templating, and the regularly linked amorphous PPy nanoparticles with tunable window sizes could play the role of crystalline lattices in the supramolecular assembly.
The electronic and magnetic structure of bulk NiO and the NiO(100) surface is calculated using density-functional theory (DFT) in the local-spin-density (LSD) approximation including self-interaction corrections. We calculate the exchange coupling constants in bulk NiO and at the NiO(100) surface and show that in the…
In this letter, we report the observation of ultraviolet light-induced change of excited charge-transfer band in nanocrystalline Y2O3:Eu3+, which is attributed to the rearrangements of local environments surrounding the Eu3+ ions in the near surface of nanoparticles.