Materials Literature
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We present a combined Density Functional/Time Dependent Density Functional study of the molecular structure, electronic states, and optical absorption spectrum of [Ru(4,4'-COOH-2,2'-bpy)(2)(NCS)(2)], a widely used charge-transfer sensitizer in nanocrystalline TiO(2) solar cells. Calculations have been performed both f…
We report that planar chiral structures affect the polarization state of light in a manner similar to three-dimensional chiral (optical active) media. In experiments with artificial metal-on-silicon chiral planar gratings of 442 wallpaper group symmetry, containing millions of chiral elements per square centimeter, we…
We present an experimental optical darkfield microscope study of the dependence of the plasmon resonance spectrum of individual silver nanoparticles on the local index of refraction. We systematically characterize the position of the resonance peaks associated with the same set of individual silver nanoparticles embed…
Abstract Thermally induced phase separation in poly(lactic acid)/dialkyl phthalate systems was investigated. Poly( DL ‐lactic acid) (PDLLA) and poly( L ‐lactic acid) (PLLA) with different molecular weights were used. A series of dialkyl phthalates, with different numbers of carbon atoms in the alkyl chain, were employ…
Danalite, the iron sulfide member of the helvite group of minerals, has been synthesised for the first time. Synthetic analogues of danalite, where selenium and tellurium replace sulfur, have also been prepared. These materials crystallise with the primitive cubic sodalite unit cell and an ordered Be–Si framework in t…
We investigated the magnetic properties of two isostructural Ni(II) metal complexes $[{\mathrm{Ni}}_{4}{L}_{8}^{b}]$ and $[{\mathrm{Ni}}_{4}{L}_{8}^{c}].$ In each molecule the four Ni(II) centers form almost perfect regular squares. Magnetic coupling and anisotropy of single crystals were examined by magnetization mea…
Abstract This study was concerned with the chemical modification process of an atactic polypropylene from polymerization reactor byproducts with p ‐phenylen‐bismaleamic acid to obtain a new grafted polymer supposed to play an important role as an interfacial agent in heterogeneous systems based on polymers. The grafti…
Abstract Modified Mg(OH) 2 /polypropylene (PP) composites were prepared by the addition of functionalized polypropylene (FPP); and acrylic acid (AA) and by the formation of in situ FPP. The effects of the addition of FPP and AA and the formation of in situ FPP on the mechanical properties of Mg(OH) 2 /PP composites we…
Our previous studies on low molecular weight hydrotropes showed that nicotinamide derivatives increased the aqueous solubility of paclitaxel by several orders of magnitude. We were interested in knowing whether the polymeric forms of those low molecular weight hydrotropes could maintain hydrotropic properties. N -Pico…
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The Edwards–Vilgis slip-link model for the chain-entanglement effect on rubber elasticity is critically assessed on the basis of quasiequilibrium biaxial stress—strain data of end-linked polydimethylsiloxane (PDMS) networks with different entanglement densities. The PDMS networks with different entanglement densities…
We study the dynamical behavior of a large bubble embedded in the plug flow of an ordered two-dimensional foam. At a critical velocity, the foam structure becomes instable and the large bubble migrates through the foam faster than the mean flow. This size segregation is due to viscous effects and happens only for flow…
Abstract A new analysis of reflection electron energy‐loss spectroscopy (REELS) spectra is presented. Assuming inelastic scattering in the bulk to be quantitatively understood, this method provides the distribution of energy losses in a single surface excitation in absolute units without the use of any fitting paramet…
Abstract N‐vinyl pyrrolidone (NVP) was grafted onto a polypropylene copolymer (PP) in melt in a Brabender Plasticorder and single screw extruder. The effect of variation of dicumyl peroxide (DCP) and lupersol (LUP) concentrations alone and with 20 wt % NVP concentration in the Brabender Plasticorder on Melt Flow Index…
In this study three types of polycrystalline highly boron-doped (ca. 1020 cm−3) diamond electrodes are compared with respect to their activity in anodic bleaching processes. A commercially available boron-doped diamond electrode (from De Beers), a conventional polycrystalline boron-doped diamond electrode grown in a h…
The Group 15 elements P, As, Sb, and Bi all have layered structures consisting of six-membered rings under ambient conditions and attain the body-centered cubic (bcc) structure at the highest pressures applied. In the intermediate pressure region, however, phosphorus and its heavier congeners behave profoundly differe…
Colloidal suspension of exfoliated layered niobate K 4 Nb 6 O 17 in water exhibited a pH-induced sol−gel transition. Viscosity of the sols drastically increased on acidification, by which thick colloids were gelated. The viscosity change depended not on the acid species (H 2 SO 4 or HCl) added to the sols but on the p…
Oligosaccharides perform a large number of biological roles, as dictated by their chemical structure and spatial arrangement. While conformational entropies are usually determined in vacuo by computer modeling, molecular recognition processes normally take place in solution. Here I show results of experiments using si…
The microstructure and chain diffusion behavior at a rubbery/glassy polymer interface (PS/PPO) were studied using the depth-resolved technique of secondary ion mass spectroscopy (SIMS). Unlike the typical rubbery−rubbery interface, the microstructure of the miscible glassy−rubbery interface demonstrated a very sharp s…
The electronic properties of TiO2 and electrochemically Li-inserted TiO2 have been studied using synchrotron radiation photoelectron spectroscopy and x-ray absorption spectroscopy (XAS) in conjunction with resonant photoelectron spectroscopy. Core level (Ti 2p) and valence level spectra show the presence of Ti3+ state…