Materials Literature
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A polarized Raman study of nanographite ribbons on a highly oriented pyrolytic graphite substrate is reported. The Raman peak of the nanographite ribbons exhibits an intensity dependence on the light polarization direction relative to the nanographite ribbon axis. This result is due to the quantum confinement of the e…
We present results of the electro-optical effect in 90° twisted nematic cells of pristine and doped liquid crystals under an applied dc voltage. The doped cells were fabricated with a minute addition of either buckminsterfullerene C60 or multiwalled carbon nanotubes (CNTs). Investigated were the switching behaviors as…
Radiative and energy-transfer processes in LiGd 1 - x F 4:Eu 3+ x, where the ground state of Gd 3+ ( 8 S 7/2 ) was selectively excited to the 6 I J state by a 275-nm pulsed laser irradiation, were studied by time-resolved luminescence spectroscopy. Two decay components were observed in Gd 3+: 6 P 7/2 → 8 S 7/2 emissio…
Abstract The scope of this paper is to continue our earlier study of the peroxide curing of elastomers derived from butadiene. Experimental evidence indicates that abstraction of allylic hydrogen and addition to the double bonds can act as a mechanism for cross‐linking. The addition reaction may give rise to a polymer…
Abstract Polysilsesquioxane with phenyl and chloromethylphenyl groups (PCPSQ) was prepared readily from phenyltrimethoxysilane and [2‐(chloromethylphenyl)ethyl]trimethoxysilane under acidic conditions. Polymerization with chloromethylphenyl groups on PCPSQ with methyl methacrylate (MMA) was conducted in the presence o…
Abstract Three new organically templated polyoxomolybdates with selenite anions as capping groups have been synthesized by hydrothermal reactions and structurally characterized. The structure of {Hbipy} 3 {KMo 4 O 13 (SeO 3 )} ( 1 ; bipy = 4,4′‐bipyridine) features a 1D anionic double chain of {KMo 4 O 13 (SeO 3 )} 3−…
Polyvinyl alcohol-hydrogels (PVA-H) have been specifically proposed as promising prosthetic biomaterials because of their excellent mechanical properties and biocompatibility. However, it is very difficult to obtain stable long-term fixation of implanted PVA-H and this problem is the key point to be solved in the furt…
A family of amorphous, solid-solution magnets of V x Fe 1 - x [TCNE] 2 · z CH 2 Cl 2 (TCNE = tetracyanoethylene; 0 ≤ x ≤ 1) composition has been characterized by IR spectrometry, elemental analysis, and magnetic measurements (ac and dc susceptibility). Substitution of Fe II for V II in V[TCNE] 2 · z CH 2 Cl 2 does not…
The decomposition of methane into carbon and hydrogen over 15 mol % MnO x /20 mol %NiO/TiO 2 catalysts was investigated. The effects of catalyst synthesis and pretreatment of 15 mol % MnO x /20 mol % NiO/TiO 2 catalysts for the activity and morphology of carbon from methane decomposition were identified, based on the…
Abstract The electric self‐heating behavior of carbon black (CB) filled high‐density polyethylene (HDPE) was studied in relation to the time‐dependent current and surface temperature under various voltages and to the voltage‐dependent surface temperature at electric–thermal equilibrium. The resistance increase due to…
Biomineralization . Patricia M. Dove, James J. De Yoreo, and Steve Weiner, Eds. Mineralogical Society of America and Geochemical Society, Washington, DC, 2003. 395 pp. Paper, $36. ISBN 0-939950-66-9. Reviews in Mineralogy and Geochemistry, vol. 54. The contributors offer specialists and nonspecialists alike a comprehe…
Abstract Summary: Poly(amide urethane)s were prepared from ε ‐caprolactam, amino alcohols, and diphenyl carbonate or ethylene carbonate in three steps. Polycondensation was performed either with α ‐hydroxy‐ ω ‐ O ‐phenyl urethanes or with α ‐hydroxy‐ ω ‐ O ‐hydroxyethyl urethanes; it was found that the reactivity at 9…
Historically, paints designed to protect steel and other metals have been formulated using anticorrosive chromate pigments, which are currently under environmental restrictions. During the investigation reported here, various phosphate compounds. The pigments prepared were characterised using a variety of chemical and…
Abstract The reactions of different transition metals with the multidentate ligand N , N ′‐bis(1,3,4‐thiadiazol‐2‐yl)‐2,6‐pyridinedicarboxamide (btapca) afford six new polynuclear complexes: the hexanuclear complexes [{Zn 6 (O) 2 (btapca) 4 }·3DMF·2H 2 O] ( 1 ) and [{Zn 6 (O) 2 (btapca) 4 }·DMF·MeOH·H 2 O] ( 2 ); the…
Pump-probe Kerr spectroscopy uncovers surface magnetic dynamics in Pr0.67Ca0.33MnO3 that are undetected by established methods based on optical spectral weight transfer. The connection between spin and charge dynamics in the colossally magnetoresistive manganites may thus be weaker than previously thought. Important d…
Abstract This study introduces a coupled reaction–diffusion model able to account for O 2 diffusion in the wall flow honeycomb particulate filter. The diffusion model is incorporated on a previously published single‐channel model for the calculation of flow distribution, heat transfer, and soot oxidation reaction. A c…
A two-photon sensor for the metal ions derived from azacrown ether as the receptor is reported. The sensor emits strong two-photon fluorescence when excited by 800 nm laser photons. Moreover, the binding constants measured by the one- and two-photon fluorescence are similar. This result may be useful for the design of…
3-Carboxy-cis,cis-muconate lactonizing enzymes (CMLEs), the key enzymes in the protocatechuate branch of the beta-ketoadipate pathway in microorganisms, catalyze the conversion of 3-carboxy-cis,cis-muconate to muconolactones. We have determined the crystal structure of the prokaryotic Pseudomonas putida CMLE (PpCMLE)…
The structure of a partially deuterated rubredoxin from the hyperthermophilic archaeon Pyrococcus furiosus, an organism that grows optimally at 100 degrees C, was determined by using the neutron single-crystal diffractometer dedicated for biological macromolecules (BIX-3) at the JRR-3M reactor of the Japan Atomic Ener…
Novel ternary assemblies consisting of fully encapsulated host-guest complexes (hemicarceplexes) and wide band gap semiconductor nanoparticles were investigated. The water-soluble amphiphilic host (octacarboxyhemicarcerand) traps the hydrophobic chromophore within its cavity and binds to the surface of metal oxide nan…