Materials Literature
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A comprehensive investigation is presented on the factors governing the photoluminescence (PL) quantum yields (QYs) and size dispersion of colloidal CdSe nanocrystals. The temporal evolution of the ensemble PL properties (absorption and luminescence spectra, QYs and lifetimes) during growth at different temperatures (…
Yes, [email protected]12 is icosahedral! We provide experimental verification of the recently proposed new class of gold clusters. Anion photoelectron spectroscopy and relativistic density functional calculations were used to show that both [email protected]12 and [email protected]12 are highly stable icosahedral clus…
Upcycled synthesis and extraction of carbon‐encapsulated iron carbide nanoparticles for gap Plasmon applications in perovskite solar cells,
Abstract Several polymer‐layered silicate (clay) nanocomposites (PLSNs) were analyzed by transmission electron microscopy (TEM) and wide‐angle X‐ray diffraction (XRD) in an effort to characterize the nanoscale dispersion of the layered silicate. The PLSNs investigated included thermoset (cyanate esters) and thermoplas…
Monodisperse samples of silver nanocubes were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP). These cubes were single crystals and were characterized by a slightly truncated shape bounded by [100], [110], and [111] facets. The presence o…
Abstract An aqueous solution of glycerol was applied to a polymeric biomaterial, leather, to evaluate its effects on the physical properties of leather, particularly stiffness. The initial strain energy, Young's modulus, and acoustic‐emission methods were used to characterize the stiffness of the resultant leather tre…
The S-function potential for single-site particles has been recently introduced as an extension of the Gay–Berne potential. With the S-function potential, we can model particles of other and, possibly, more realistic shapes than Gaussian overlap ellipsoids and we can simulate mixtures in a systematic manner. As an exa…
We have developed a new method for the synthesis of Pd nanoparticles with controllable sizes within a silica matrix using solid-supported surfactants in supercritical CO2. XRD, HRTEM and CO chemisorption data show that unformly sized Pd nanoparticles are evenly distributed within the porous silica and are chemically t…
Silicate-based and silicophosphate-based compounds containing caesium have been synthesized by a sol–gel process. The structural changes induced by thermal treatment have been studied by XRD, XRF, DRIFTS, thermogravimetric and XPS analyses. The solids crystallise upon heating and the behaviour of the crystallisation p…
Abstract The crystallization and morphology of very‐low‐density polyethylene (VLDPE) and ultra‐low‐density polyethylene (ULDPE) blends with isotactic polypropylene (PP) were studied by differential scanning calorimetry (DSC) and hot‐stage optical microscopy (HSOM) with polarized light. In particular, the isothermal cr…
Abstract The development of the interfacial bond strength as a function of bonding conditions has been investigated in two representative semicrystalline thermoplastics, isotactic polypropylene and polyamide 12. If one side of the interface is well above the melting point immediately before contact, more rapid effecti…
Abstract Black rice husk ash (BRHA) and white rice husk ash (WRHA) were incorporated into natural rubber (NR) using a laboratory‐size two‐roll mill. A conventional vulcanization system (CV) was chosen and cure studies were carried out on a TI‐100 Curometer. The torque curves were obtained at 150, 160, 170, and 180°C.…
Contributions to the line shape of high-resolution Al $K\ensuremath{\alpha}$ x-ray excited carbon $1s$ photoemission of highly oriented pyrolytic graphite are described and compared with previous work. A two-component system is used to model experimental results obtained from two photoelectron takeoff angles. The spli…
The cell and window diameters of silica foams can be easily increased by as much as 18 nm through a simple postsynthesis hydrothermal treatment, indicating that the silica framework remains labile and responsive to the temperature dependence of the microemulsion droplet size within the cells. This makes it especially…
Rapid development of optical fiber amplifiers, and more especially of the erbium-doped fiber amplifiers (EDFA) during the last decade, has benefited from extensive work on the configuration of the system itself: determination of pump wavelength, pumping configuration, improvement of noise performance, etc. However, le…
Most of the models purporting to explain the intriguing observation of colossal magnetoresistivity (CMR) in manganites invoke double exchange (DE) electron transfer between ${\mathrm{Mn}}^{3+}$ and ${\mathrm{Mn}}^{4+}$ ions, and coupling between the itinerant electrons and the dynamic Jahn-Teller (J-T) lattice distort…
The design and synthesis of Pd complexes with two β-ketoiminate or with two imino-alcoholate chelate ligands is reported. In order to establish their structures in the solid-state, methoxyethyl substituted complexes 1c and 2c were characterized by single crystal X-ray diffraction, showing a square-planar local coordin…
Kaolinite transforms to mullite and crystobalite at 1200 °C. The additive copper oxide decreases the transformation temperature by 200 °C. The effect of copper oxide addition and its concentration and transformed products are reported using a combination of X-ray diffraction and thermal analysis.
Compaction from a random-loose-packed to a random-close-packed phase is observed when monodisperse granular beds are shaken, but beyond this packing, the system freezes up in a jammed structure. Here we report a technique to grow large hard-sphere granular crystals, with perfect stacking and no defects by means of a "…
Catalytic enantioselective epoxidation of homoallylic alcohols using Zr(Ot-Bu)(4) and tartrate ester (or tartramide) has been developed. In the Zr(Ot-Bu)(4)/diisopropyl tartrate-catalyzed epoxidation, the reverse of the enantiofacial preference was observed, depending on the Zr/ligand ratios of 1:1 or 1:2. [reaction--…