Materials Literature
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The effects of niobium doping on the hysteresis parameters of sol—gel Pb 1.1−(x/2) (Zr 0.53 Ti 0.47 ) 1−x Nb x O 3 (0, x, 0.05) have been reported for two sets of films with analogous grain size and degree of (111) texture but with different surface microstructures. For both sets, a strong continuous decay of the remn…
We review the effects of scattering-interference of the primary, exciting beam on the electron emission from ordered atomic arrays. The yield of elastically and inelastically backscattered electrons, Auger electrons and secondary electrons shows a marked dependence on the incidence angle of primary electrons. Both the…
Copolymers containing vinylpyrrolidone and mono and dialkyl itaconate units with different length in the side chains were synthesized and characterized. Copolymers of vinylpyrrolidone with three different compositions of monomethyl, monoethyl, monopropyl, monoamyl, dimethyl, diethyl, dipropyl, and diamyl itaconate wer…
The spreading of n -octane droplet at the surface of sodium chloride aqueous solutions was investigated as a function of the salt concentration in a saturated closed cell. As long as the salt concentration is lower than 1.2 M, the macroscopic drop takes the form of a lens in a stable coexistence with its adsorbed thin…
The syntheses of the first dimeric donors ( 19a − c ) derived from TTF with p -quinodimethane structures as well as the analogues dimeric acceptors ( 20, 21 ) derived from TCNQ and DCNQI have been carried out from the novel 2,2‘-oxydianthraquinone ( 18 ). Depending upon the substitution pattern on the 1,3-dithiole rin…
We have determined relative affinities of type I and type II human non-epidermal cytokeratin (CK) polypeptides synthesized in Escherichia coli from cDNA, using the method of surface plasmon resonance, and have compared the influence of ionic strength and ion quality on the assembly to intermediate filaments (IFs) by v…
A synthetic layered double hydroxide (LDH: Mg-Al-CO3) was heated to 560 °C for 3 h in air, and the resulting calcined LDH (1.00 g dm−3) was used in the sorption study of aquatic CrO4 2− (concentration range: 1.0 × 10−3 − 5.0 × 10−3 mol dm−3) under CO2 free atmosphere. Reconstructed LDH containing intercalated CrO4 2−…
Abstract The molecular dynamics of amorphous and liquid‐crystalline (LC) side‐chain polycarbonates was studied by dielectric spectroscopy at frequencies from 10 −2 to 10 6 Hz and at temperatures from −160 to 180°C. ‘Model’ compounds containing no mesogenic side‐groups showed two relaxations, which originate from the c…
The ion–thin-film interaction during plasma-enhanced chemical vapor deposition of hydrocarbon films (C:H films) from a methane electron cyclotron resonance plasma was investigated by means of in situ ellipsometry. Films were deposited with varying rf bias, resulting in a dc self-bias ranging from floating potential up…
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…