Materials Literature
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We report on the growth of very high-quality Al-doped n-type ZnO epilayers on sapphire substrates using a radio-frequency (rf) magnetron sputtering technique combined with a rapid-thermal annealing. Photoluminescence (PL) and Hall measurements show that both the optical and electrical properties of the ZnO layers are…
The dynamics of a domain wall driven by a spin-polarized current in a mesoscopic system is studied numerically. Spin-mixing in the states of the conduction electrons is fully taken into account. When the Fermi energy of the electrons is larger than the exchange energy ($E_{\rm F}>J_{\rm sd}$), the spin precession indu…
We use a mapping of the quasi-2D electron liquid to a classical fluid and use the hypernetted-chain equation inclusive of bridge corrections, i.e., CHNC, to calculate the electron pair-distribution functions and exchange-correlation energies as a function of the density, layer width, spin-polarization and temperature.…
A pressure-induced linkage isomerization of the cyanide anion has been observed in single crystals of a chromium(III)-iron(II) Prussian blue analogue of formula K0.4Fe4[Cr(CN)6]2.8 square1.2.16H2O (1). Upon application of pressure in the 0-1200 MPa range, the cyanide ligand rotates and becomes C-bonded to the iron(II)…
We have studied the stability, the electronic, and the magnetic properties of Co2MnSi(001) thin films for 15 different terminations using density functional theory calculations. The phase diagram obtained by ab initio atomistic thermodynamics shows that in practice the MnSi, pure Mn, or pure Si terminated surfaces can…
Doubly luminescent core/shell structure nanoparticles were synthesized for biological detection. In the first step gadolinium oxide (Gd 2 O 3 ) core doped with the luminescent Tb 3+ ions was obtained by applying, with modifications, the polyol route, which allows direct precipitation of oxide nanoparticles in a polyal…
The dielectric properties of tantalum doped BaTi0.85Zr0.15O3 were investigated. The conventional solid state reaction method was used to make the ceramic samples. The composition was close to the pinch point of the three structure phase transitions in BaTiO3. Powder X-ray diffraction result indicated that the samples…
A phosphine oxide polymer was developed using bis(dichlorophosphino)ethane and poly(ethylene glycol). This polymer system was used to transfer various nanoparticles from organic solvents to water, retaining their physical properties and reactivities.
The behavior of nitrogen in ZnO thin films grown by high-vacuum plasma-assisted chemical vapor deposition is examined. Highly oriented (002) films doped with 0–2at.% N were characterized by x-ray photoelectron spectroscopy, x-ray diffraction (XRD), Seebeck, and Hall measurements. XRD measurements revealed that the zin…
Colleges and universities use labpacks to dispose of much of their chemical waste. Excessive identification of material as acute hazardous waste or including the weight of containers and packing materials may raise the regulatory status of a program leading to additional paperwork and operational restrictions. Small a…
By use of a laser-monitoring observation technique, the solubilities of potassium p -chlorophenoxyacetate in ethanol + water were measured at temperatures ranging from (295.61 to 358.16) K using a synthetic method at atmospheric pressure. The experimental data were correlated with an empirical equation. Results indica…
Abstract In situ polymerization is the most successful technique for thermoplastics and thermosets for the preparation of well‐dispersed polymer‐layered silicate nanocomposites with desirable mechanical, thermal, and electrical properties. The efficiency of this approach depends significantly on the polarity of the mo…
Ferroelectric Bi3.25La0.75Ti3O12 (BLT) thin films were deposited on Pt∕Ti∕SiO2∕Si substrates by the polymeric precursor method. The films present c-axis preferred orientation after annealing at 700°C for 2h in conventional furnace. All the capacitors showed good polarization fatigue characteristics at least up to 1×10…
The selective nitration of meso-tetraphenylporphyrin complexes is described. The reaction of the above porphyrinates with 25% HNO3 or 5% HNO3 at room temperature or 0-5 °C, respectively, results in the formation of the corresponding mono β-nitroporphyrins (56-81%), accompanied by small amounts of a mixture of β,β-dini…
Abstract For Abstract see ChemInform Abstract in Full Text.
In this letter, gold nanoshells with a size of ∼20nm were prepared by a wet-chemical synthesis method and the surface plasmon absorption band of gold was tuned from visible to near-infrared. The gold nanoshell hydrosol demonstrated excellent photothermal conversion property. The temperature of the hydrosol was increas…
Abstract The possible design of phase shifters with reduced frequency dispersion using combined sections of forward‐wave (FW) and backward‐wave (BW) transmission lines is discussed. It is shown that inclusion of backward‐wave sections into a transmission line always increases the total dispersion. On the other hand, w…
Abstract For Abstract see ChemInform Abstract in Full Text.
We report on an experimental study of macroscopic energy transfer in ZnO bulk crystals. We observe the ultraviolet photoluminescence (PL) emission from the near band edge (3.4eV at room temperature), a green emission band from a deep center transition, and an orange emission band. Unusually, the orange PL is not only…
The thermal decomposition of guanidinium tetraborate, pentaborate, and nonaborate has been characterized under nitrogen and ammonia atmospheres, and conditions have been defined for bulk powder and aqueous aerosol transformations of these precursors to boron nitride (BN). The bulk pyrolyses under ammonia (600−1400 °C)…