Materials Literature
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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…
UNLABELLED: ViTO is a graphical application, including an editor, of multiple sequence alignment and a three-dimensional (3D) structure viewer. It is possible to manipulate alignments containing hundreds of sequences and to display a dozen structures. ViTO can handle so-called 'multiparts' alignments to allow the visu…
A novel composite material has been fabricated for bone tissue engineering scaffolds utilizing the biodegradable polymer poly(propylene fumarate)/poly(propylene fumarate)-diacrylate (PPF/PPF-DA) and surface-modified carboxylate alumoxane nanoparticles. Various surface-modified nanoparticles were added to the polymer i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis Strategies and Chemistry of Nonsymmetrically Substituted TetrachalcogenafulvalenesJ. M. FabreView Author Information Laboratoire de chimie organique: Hétérochimie et matériaux organiques, UMR 5076, ENSCM, 8, rue de l'école normale, 34296 Montpellier Cedex 5, France…
Abstract Mixtures of urea and formamide were tested as plasticizers for thermoplastic starch (TPS). The hydrogen bonding interactions between urea/formamide and starch were investigated by using Fourier‐transform infrared spectroscopy (FT‐IR). The thermal stability, mechanical properties and starch retrogradation beha…
Isolated manganese clusters, ${\text{Mn}}_{n},\phantom{\rule{0.3em}{0ex}}(n=5--22)$ are deflected by a linear-gradient magnetic field. ${\text{Mn}}_{7}{\text{\ensuremath{-}}\text{Mn}}_{22}$ are found to deflect uniformly toward high field. The magnitude of the deflections indicate susceptibilities far in excess of tho…
We report a computer simulation study of the glass transition for water using the extended simple point charge potential. To mimic the difference between standard and hyperquenched glass, we generate glassy configurations with different cooling rates, and we calculate the temperature dependence of the specific heat on…
Chitosan/silica hybrids were synthesized and shaped as microspheres, which may or may not present a core/shell structure, depending on the experimental conditions. The core is constituted by a homogeneous hybrid, while the shell is pure silica. The amino groups of the biopolymer are still accessible as active sites fo…
Near edge X-ray absorption fine structure (NEXAFS) has been employed to provide insight into the chemical nature of nitrogen in deposits formed from plasmas of allylamine and propylamine. The nitrogen K-edge spectra of these materials unambiguously demonstrate the presence of significant quantities of sp or sp 2 hybri…
We explain the phenomena of ferroelectric phase transition temperature $T_c$ enhancement beyond the end members in perovskite solid solutions like BiMeO$_3$-PbTiO$_3$ (Me=Sc, In, etc.) is related to nonlinear and spatial correlation effects. The explanation is based on the calculation of $T_c$ in the framework of our…