Materials Literature
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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)…
[reaction: see text] Two series of aniline oligomers bearing fused heterocycles as an electron-acceptor unit were synthesized. They consist of aniline or its derivatives as an electron donor and benzothiadiazole (BT) or quinoxaline (QX) as an electron-acceptor unit. Benzothiadiazoles 1-3 were synthesized by palladium-…
For all of the inorganic porous spin-on low- k films being developed today, a post-spin-on hydrophobic treatment is needed to reduce their moisture sensitivity. In the present work, we demonstrate that, for pure-silica-zeolite MFI spin-on low- k films, this extra hydrophobic treatment step can be potentially eliminate…
Surface nitridation is used to eliminate O-polar inversion domains and control the growth of single-domain Zn-polar ZnO film on sapphire (0001) substrate by rf-plasma-assisted molecular-beam epitaxy. It is found that the nitridation temperature is crucial for achieving quality AlN buffer layers and ZnO films with cati…
Graphite, carbon-coated silicon, and carbon-coated nickel surfaces were bombarded with obliquely incident Ar+ ions at room temperature. The sputtered surfaces were covered with conical protrusions, ∼2.5×105mm−2 or higher in numerical density, and partially aligned single carbon nanofibers (CNFs), ∼20nm in diameter and…
Si clathrates ${({\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x})}_{8}{\mathrm{Si}}_{46}$ with $x\ensuremath{\leqslant}0.75$ have been successfully synthesized and their superconductivity studied both experimentally and by ab initio calculations. The linear decrease of the cubic lattice parameter with the Sr content…
As a well-known oxidation catalyst, platinum is currently being used to convert NO to $\mathrm{N}{\mathrm{O}}_{2}$ for absorption in so-called $\mathrm{N}{\mathrm{O}}_{x}$ traps under excess oxygen conditions, where direct conversion of NO to nitrogen gas is prohibitive. By performing kinetic Monte Carlo simulations w…
Abstract The propagation of plane waves in an isotropic chiral medium (ICM) is investigated. Simple conditions are derived—in terms of the constitutive parameters of the ICM—for the phase velocity to be directed opposite to the direction of power flow. It is demonstrated that phase velocity and power flow may be oppos…
The spatially anisotropic kinetics involved in the chemical reaction between highly ordered pyrolytic graphite (HOPG) and a beam containing hyperthermal (approximately 8 km s(-1)) O((3)P) atomic oxygen and molecular oxygen yields unique surface morphologies. Upon exposure at moderate sample temperatures (298-423 K), n…
Scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) was used to determine the chemical distribution of semiconductor shell material around colloidal core-shell CdSe/ZnS quantum dots (QDs). EELS signals from positions around the QD indicate a well-defined shell of ZnS…