Materials Literature
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Pressure and temperature dependence of electrical resistance of cobalt monoxide (CoO) was examined using a diamond anvil cell to 133 GPa and 20–300 K. At room temperature, drastic decrease in the electrical resistance (eight orders of magnitude) was observed in the pressure range of 43 to 63 GPa. Another small decreas…
The thermal conductivity of four binary aqueous NaBr solutions of (10, 20, 30, and 38) mass %, three binary aqueous KBr solutions of (10, 20, and 30) mass %, and three ternary aqueous NaBr + KBr solutions of (10NaBr + 5KBr, 10NaBr + 10KBr, and 10NaBr + 20KBr) mass % have been measured with a concentric-cylinder (stead…
Silica optical fibers drawn from a common preform and coated with specialty coatings were exposed to zero-stress aging in various aqueous environments for approximately ten months. The strength of the fiber samples was tracked with two-point bend testing. The onset of an aging “knee” was observed for some fiber sample…
In an effort to clarify the effect of dynamical heterogeneity on the glass transition in binary systems, we measured the heat capacity C p on concentrated toluene solutions of polystyrene (PS) using an adiabatic calorimeter. We also carried out dielectric measurements on the same system. Results indicate that the C p…
Boron carbide (B4C) powder has been densified by a novel method of powder consolidation known as Plasma Pressure Compaction (P2C). The P2C technique allows for rapid consolidation of powder by Joule heating of the powder bed. Powder is placed in graphite dies, and uniaxial pressure and low-voltage, high-amperage (10 V…
A new surface phenomenon is reported for hybrid nanocomposites comprising (1) a low Tg poly(dimethylsiloxane) (PDMS) phase cross-linked by (2) a siliceous phase (SP) generated by in situ hydrolysis/condensation of poly(diethoxysiloxane) (PDES), and (3) fumed silica nanoparticles (FSN). After ambient temperature cure,…
We present detailed electron-spin resonance investigations on single crystals of the one-dimensional vanadium-oxide bronze $\ensuremath{\beta}\ensuremath{-}\mathrm{N}{\mathrm{a}}_{\mathrm{1}\mathrm{/}\mathrm{3}}{\mathrm{V}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{5}}$. From the angular dependence of the $g$ value it can be…
Dielectric dispersion measurements were made on aqueous solutions of a triple-helical polysaccharide schizophyllan over a wide concentration range 10-50 wt % at -45 to +30 degrees C. In the solution state, three different water structures with the different relaxation times tau were found, namely, bound water (taul),…
Abstract We exploited the practical sonochemical route for preparing silicon nanocrystals at room temperature and ambient pressure. This synthesis provided the very fast reaction within a few hours and the useful modification for the surface of silicon nanoparticles. The average size of prepared nanocrystals was 2.8 n…
Spin polarized density functional theory based calculations within the GGA/PW91 exchange-correlation functional have been carried out to investigate the interaction of Co, Rh, and Ir atoms with the Al-terminated α-Al 2 O 3 (0001) surface at 1/3 ML coverage. A periodic supercell approach has been used and two possible…
Two novel compounds, [Cu2(pydc)2(inta)2(H2O)2]·3H2O 1 (pydc = 2,6-pyridinedicarboxylic acid, inta = isonicotinic acid) and [Cu(pydc)2][Cu(H2O)5]·2H2O 2, have been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analyses and IR spectra. Compound 1 exhibits reverse satura…
A((=))-D, [A((=))](2)-D and [A ((=))](3)-D multi-maleimides and multi-itaconimides bearing electron-donating chromophores display a strong fluorescence quenching due to an intramolecular charge-transfer interaction. The electron-accepting C=C bond plays a key role in the intramolecular quenching. For the isomerization…
We have synthesized a homologous series of soluble, linearly conjugated oligomers and related polymers using molybdenum alkylidene catalysts. We have developed HPLC procedures to isolate the oligomers according to their chain lengths and have obtained the absorption spectra of the purified oligomers in room temperatur…
Abstract An experimental study was carried out of periodically operated NOx (NO + NO 2 ) storage and reduction on a model Pt/BaO/Al 2 O 3 catalyst powder. The effect of the reductant (propylene) injection policy on time‐averaged NOx conversion was evaluated in terms of feed composition and temperature, reductant pulse…
Sorption of organic acids by variable-charge soil occurs through both hydrophilic and hydrophobic sorption. In this study, the effect of chemical acidity and the type of acidic functional group on the relative contribution of hydrophilic and hydrophobic processes to sorption by a gibbsite-dominated and a kaolinite-dom…
Highly crystallized TiO 2 nanocrystallites (10−50 nm in size) with controlled phase structures (anatase and rutile) were synthesized using a one-step process. Flying TiC micrometer-size powder was oxidized in Ar−O 2 and Ar−H 2 −CO 2 plasmas with various configurations used for injecting oxygen into the reaction system…
The effect of sidewall functionalization on the dielectrophoretic mobility of single-walled carbon nanotubes is investigated using a 10-μm electrode gap and an alternating current electric field of 10 V and 10 Mhz. For nanotubes dispersed in aqueous solution using 1% sodium dodecyl sulfate, a high degree of alignment…
The present work is concerned with a thermodynamics model that describes the redox switching of electroactive polymers. It is well-known that, during the redox switching of these polymers, the following phenomena occurs: (i) conformational changes, (ii) income/outcome of solvent molecules with the subsequent changes i…
Short-range ferroelectric order is postulated to explain unusual one-dimensional dielectric response in ferroelectric 1,4-diazabicyclo[2.2.2]octane. In this pure organic salt, the polar regions are created in the antiferroelectric matrix of hydrogen-bonded polycationic chains due to the random proton transfers in NH +…
The Mycobacterium tuberculosis genome contains an unusually high number of proteins involved in the metabolism of lipids belonging to the Lip family, including various nonlipolytic and lipolytic hydrolases. Driven by a structural genomic approach, we have biochemically characterized the Rv1399c gene product, LipH, pre…