Materials Literature
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A series of novel soluble conjugated regioregular copolymers (poly(2,5-dialkoxy-p-phenylene thienylenes)) was prepared via palladium-catalyzed Stille coupling reactions. The attachment of ethylene oxide chains to the phenylene rings ((OCH2CH2)nOR; n = 2, R = Me; n = 2, R = Bu; n = 3, R = Me) provided to the polymer in…
Abstract Summary: Novel polyester and copolyesters have been prepared by anionic ring‐opening polymerization of racemic 4‐alkyloxycarbonyl‐3,3‐dimethyl‐2‐oxetanones that had been synthesized in five steps from diethyl oxalpropionate used as chemical precursor. The anionic polymerizations, realized in bulk or in soluti…
Reaction of K3[Cr(CN)6] with [CuL1](ClO4)2 (L1 = 3,10-dipropyl-1,3,5,8,10,12-hexaazacyclotetradecane) leads to a novel three-dimensional (3-D) cyano-bridged bimetallic assembly [CuL1]2[Cr(CN)6]ClO4·0.5H2O (1), in which each hexacyanochromate(III) ion connects four copper(II) ions using four co-planar CN− groups, which…
Cyclic voltammetry and potentiometric chrono method were conducted on yttria-stabilized zirconia (YSZ)-supported (LSM) electrode to elucidate the kinetics of electrochemical redox of Mn ions at the LSM/YSZ interface and its effect on the performance of LSM electrode under cathodic polarization. Three electrochemical p…
Macroporous perovskite manganites La0.7Ca0.3−xSrxMnO3, whose pores are highly ordered, have been prepared by a colloidal templating technique. The pore size was found to be about 400 nm and the wall thickness was in the range of 40–60 nm. As the Sr content increased, the ferromagnetic transition temperature (TC) gradu…
We report on a novel non-volatile memory concept for resistive information storage. The particular device structure consists of a conductive ferroelectric/non-ferroelectric 2-layer sequence. Resistive switching is observed, by applying a voltage pulses. Our model predicts that the switching correlates with a change of…
Fossil marine diatom resting spore species in the morpho-genus Xanthiopyxis Ehrenberg are described using samples from DSDP Site 338 in the Norwegian Sea, Sites 436 and 438 in the northwest Pacific and from the onland section at Newport Beach, California. Xanthiopyxis is characterized by numerous knobs, spines and bri…
To control the molecular organization of octadecyl rhodamine B (RhB18), hybrid Langmuir–Blodgett monolayers containing clay minerals were prepared. The orientation and conformation of the RhB18 molecule were analyzed by polarized attenuated total reflection Fourier transform infrared (ATR–FTIR) spectroscopy and fluore…
CdSe and CdSe/CdS core/shell nanoparticles were prepared by a one-pot synthesis process. The CdSe/CdS core/shell nanoparticles showed red-shift absorption and emission spectra compared to the CdSe core. An optimal reaction time for CdS to form on the CdSe nanoparticles was evaluated and the highest photoluminescence y…
Abstract Summary: Phenolic alkylimidazolineamides were prepared and applied as modifiers in order to render layered silicates organophilic and to prepare polymeric nanocomposites. The imidazolineamine, 2‐{2‐[heptadec‐8‐enyl]‐4,5‐dihydro‐1‐imidazol‐1‐yl}‐1‐ethaneamine (IA), was reacted in bulk with one of the two pheno…
Er-doped BaTiO3 samples with nominal compositions BaEr0.08Ti0.92O2.96 and Ba0.96Er0.08Ti0.96O3 have been analyzed with Er–LIII edge XAFS. The first sample shows predominant Er substitution on the Ti site of the perovskite structure, the second one shows almost equal occupancy of Er on Ba and Ti sites, thus assessing t…
Biosynthesis of polyhydroxyalkanoates (PHAs) consisting of 3-hydroxy-alkanoates (3HAs) of 4 to 10 carbon atoms was examined in metabolically engineered Escherichia coli strains. When the fadA and/or fadB mutant E. coli strains harboring the plasmid containing the Pseudomonas sp. 61-3 phaC2 gene and the Ralstonia eutro…
Selective and blanket growth of ruthenium dioxide (RuO2) nanorods have been achieved in chemical vapor deposition (CVD) using bis(ethylcyclopentadienyl)ruthenium. Area-selective growth is demonstrated on a substrate which consists of patterned SiO2 as the non-growth surface and LiNbO3(100) or Zn/Si as the growth surfa…
Coherent Microradiology Directly Observes a Critical Cathode-Anode Distance Effect in Localized Electrochemical Deposition , Seol, S. K., Yi, J. M., Jin, X., Kim, C. C., Je, J. H., Tsai, W. L., Hsu, P. C., Hwu, Y., Chen, C. H., Chang, L. W., Margaritondo, G.
One hydrogen malonato-bridged complex of formula [Cu(Hmal)2] (1) and two polymorphous malonato-bridged complexes of formula [Cu(H2O)(H2mal)(mal)] (2 and 3), in which the three species of the malonate (H2mal, Hmal−, and mal2−) are present, were synthesised and characterized by X-ray diffraction [H2mal = malonic acid].…
Aragonite CaCO3/polymer thin film composites were successfully obtained by using cooperative effects of chitosan, poly(aspartate), and MgCl2. The structures of these composites were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The combination of poly(aspartate) and the magnesium ion…
Mechanically induced free radical (mechanoradical) formation of several substituted celluloses such as carboxylmethyl cellulose, chitin, and chitosan was studied based on electron-spin resonance (ESR) in comparison with those of plasma-induced radicals. Room temperature ESR spectra had multicomponent spectra and were…
A geometric theory is developed for a spherical concave diffraction grating that has variable line spacing and curved grooves and can be produced with existing technology. The aberration coefficients of this grating are determined. A comparison of these coefficients with the corresponding coefficients of holographic g…
Two novel fluorene-trimers were synthesised following a Suzuki-type cross-coupling reaction. Methyl pendant chains in 9-position of the fluorene building blocks ensured a rod-like backbone of a small molecular diameter while the introduction of terminal, flexible n-octyl and n-hexadecyl alkyl chains in the 2- and 7″-p…
The synthesis and characterization is reported of a novel discotic side group polymer based on a predominantly poly(ethylene oxide) backbone to which are attached triphenylene-based mesogenic groups via flexible spacers. The thermal and mechanical behavior of this polymer and its complex with lithium perchlorate are c…