Materials Literature
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A spider can spin major ampullate silk (drag line) at rates that differ by more than an order of magnitude, and yet obtain consistently reliable tensile properties. Silk samples collected at different rates and stained by infiltration with tin were studied by transmission electron microscopy. The stained microstructur…
We have performed molecular dynamics simulations of the liquid-liquid phase separation of a binary mixture confined in two different sizes of cylindrical pore. In these systems, the interactions between the two fluids and the pore wall are identical so that no wetting occurs and the fluid separates into a series of pl…
Reaction of Ag(O 3 SCF 3 ) with 2 equiv of HC(3,5-Me 2 pz) 3 in thf provides the stable six-coordinate “sandwich” complex {[HC(3,5-Me 2 pz) 3 ] 2 Ag}(O 3 SCF 3 ). The solid-state structure shows that the coordination geometry about the silver is a trigonally distorted octahedron. Substantial tilting of the pyrazolyl r…
The two components of the segmental dynamics of poly(vinylethylene) (PVE) and polyisoprene (PIP) miscible blends, as observed dielectrically, are resolved and analyzed. This analysis is based upon a generalization of the CONTIN algorithm for inverse Laplace transformations presented in a previous publication. By means…
Ubiquitin-conjugating enzymes are a family of related proteins that participate in the ubiquitination of proteins. Previous studies on the crystal structures of Saccharomyces cerevisiae Ubc4 and Arabidopsis thaliana Ubc1 indicated that the smallest enzymes (class I), which consist entirely of the conserved core domain…
A critical comparison is made between the two leading material technologies being developed for the first generation of non-volatile ferroelectric memories. One of them is based on Pb(ZrxTi1-x)O3 (PZT) and the other on a layered perovskite family of materials, of which the most intensively investigated is Sr1-xBi2+yTa…
An evacuated, temperature-controlled cell has been built for use on the small-angle X-ray scattering instrument D24 at the synchrotron radiation facility LURE. The sample is placed in a quartz capillary sealed in a stainless-steel holder using a vacuum-tight glue. Several O rings provide a vacuum path upstream and dow…
A detailed study of the vibrational structure of the silasesquioxanes H 8 Si 8 O 12 and H 10 Si 10 O 15 based on INS, IR, and Raman spectra and on a normal-coordinate analysis is reported. The inelastic neutron scattering (INS) spectrum of crystalline H 8 Si 8 O 12 is in good agreement with the optical data and allowe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThreshold Strain Value for Perpendicular Orientation in Dynamically Sheared Diblock CopolymersDaniel Maring and Ulrich WiesnerView Author Information Max-Planck-Institut für Polymerforschung, Postfach 3148, D-55021 Mainz, Germany Ci…
A series of compounds has been prepared in which a tetrathiafulvalene (TTF)-derived donor is covalently tethered or bridged to one or more bipyridinium (viologen) acceptors. The relative degree of charge transfer observed in this series is discussed as a function of structure. The greatest CT effect is seen in the cyc…
First principles methods are used to study N doping of diamondlike amorphous carbon. A structural model containing 216 atoms is introduced, whose properties are in agreement with the available experimental data. The topological and electronic properties for different N doping concentrations are investigated. We find t…
Novel electrochemically-doped vinyl polymers containing 2,2‘:5‘,2‘‘:5‘‘,2‘‘‘-quaterthiophene, 4‘,3‘‘‘-dioctyl-2,2‘:5‘,2‘‘:5‘‘,2‘‘‘:5‘‘‘,2‘‘‘‘-quinquethiophene, and 4‘,3‘‘‘‘-dioctyl-2,2‘:5‘,2‘‘:5‘‘,2‘‘‘:5‘‘‘,2‘‘‘‘:5‘‘‘‘,2‘‘‘‘‘-sexithiophene as pendant groups were prepared by anodic polymerizations of the corresponding…
A new class of nonlinear optical chromophores (NLO‐phores) with large off‐diagonal components of the second‐order polarization and remarkable transparency properties have been investigated. The synthesis and NLO characterization of a series of C 2n symmetry benzene derivatives, such as that shown in the Figure, are de…
The crystal structure, low field ac susceptibility, magnetization, and magnetoresistance behavior of ${\mathrm{La}}_{(2\mathrm{\ensuremath{-}}\mathrm{x})\mathrm{/}3}$${\mathrm{Nd}}_{\mathrm{x}\mathrm{/}3}$${\mathrm{Ca}}_{1\mathrm{/}3}$${\mathrm{MnO}}_{3}$ (x=0--2) compounds are investigated. The crystal structure of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Chemistry of Pyridonate Complexes of Late 3d-MetalsSimon Parsons and Richard E. P. WinpennyView Author Information Department of Chemistry, The University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, U.K.Cite this: Acc. Chem. Res. 1997, 30, 2, 89–95Publicatio…
We analyze the relationship between the tendency to electron localization, which is observed in many quasicrystals and approximants, and the local atomic order. Starting from the structural models, we consider atomic clusters that are embedded in a metallic medium, and we study their scattering properties within the m…
β-CuI nanocrystallites (NCs) are synthesized on the atomically smooth graphite basal plane surface using a new hybrid electrochemical/chemical (E/C) method. This method involves the following steps: (1) electrochemical deposition of copper NCs onto an electrode surface, (2) electrochemical oxidation of these copper NC…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEncapsulated Electroactive Molecules Based upon an Inorganic Cluster Surrounded by Dendron LigandsChristopher B. Gorman, Brandon L. Parkhurst, Wendy Y. Su, and Kang-Yi ChenView Author Information Department of Chemistry North Carolina State University Box 8204, Raleigh…
Power plant operators in Germany, Europe and other countries are reducing flue gas NO x emissions of large and small power plants to meet air quality regulations for the population and the environment. Beginning with the environmental impact, the use of different techniques for NO x reduction and experience with these…
The investigation was carried out on two laboratory steels elaborated from identical base materials, one with 0.05% Sb and an industrial steel as‐delivered and after decarburisation. Cold rolled 0.5 mm sheets were prepared by laboratory rolling and investigated after annealing in temperature range 550 to 800°C for 0.5…