Materials Literature
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Abstract Crystallization behavior and rheological properties of blends of bisphenol‐A polycarbonate (PC) and polypropylene (PP) prepared by screw extrusion have been investigated by differential scanning calorimetry (DSC), polarized‐light microscopy, scanning electron microscopy, and a Rheometrics Mechanical Spectrome…
We investigate electroconvection of nematic liquid crystals in planar 90 degrees twist cells in the dielectric regime. These cells provide competing boundary conditions for the nematic director at both electrodes. When the ratio of cell gap and roll width is not too small (in thin cells and at low frequencies), the co…
Glucoside derivatives of some UV absorbers have been prepared and investigated as photostabilizers for PVC in absence and in presence of Ca-Zn stearate. The results indicate a reasonable stabilizing effect of the glucosides compared with the parent UV absorbers. The prepared glucosides were also investigated as therma…
Sustainable land use in periodically dry Brazilian savannas requires a water‐saving management. We hypothesized that the annual course of matric potentials (ψ M ) in very‐fine, isohyperthermic Anionic Acrustoxes of Pinus plantations (PI), degraded (DP) and productive pastures (PP), no‐till (NT) and conventional tillag…
Solid polymorphism of four compounds of the type [M(NH 3 ) 6 ](XY 4 ) 2 , where M = Co 2+ or Cd 2+ , and XY 4 = ClO 4 - or BF 4 - has been studied at 100 -300 K by DSC. One or two phase transitions of the investigated compounds have been found. For the compounds with M = Co the phase transitions have not yet been desc…
Abstract Rapidly crystallized blends of metallocene isotactic polypropylene and propylene‐ethylene random copolymers with an ethylene content varying from 0.76 to 7 mol% were found to cocrystallize to different degrees depending on the composition of the comonomer and content of copolymer in the blend. The degree of m…
The crystal structure of the tetrameric glycolytic enzyme phosphoglycerate mutase from the yeast Saccharomyces cerevisiae has been determined to 1.7 A resolution in complex with the sugar substrate. The difference map indicates that 3-phosphoglycerate is bound at the base of a 12 A cleft, positioning C2 of the substra…
The homoleptic bis(phthalocyaninato) cerium(IV) sandwiches Ce(Pc*)2 [Pc* = Pc(C7H15)8, Pc(OC5H11)8, Pc] have been prepared and characterized by UV-vis, near IR, IR, mass spectrometries, CV and differential-pulse voltammetry (DP).
The reduction of RE3+ to RE2+ (RE=EU, Sm and Tm) in SrB6O10 prepared in air by high-temperature solid state reaction was observed. The luminescent properties of Eu2+ and Tm2+ show f-d transition and Sm2+shows f-f transition at room temperature. Three crystallographic sites for Sm2+ in matrix are available. Vibronic tr…
Cobalt(II) tetrasulfophthalocyanine complex was adsorbed on the 3-N-propylpyridinium chloride functionalized silica gel surface by means of an ion exchange reaction. The specific surface area of the modified silica was SBET= 320 m2 g–1 and the amount of the complex bonded to the substrate surface was 17 mol g–1. A car…
Two kinds of conductive polypyrrole composites were prepared by in-situ polymerization of pyrrole in a suspension of chlorinated polyethylene powder or in a natural rubber latex using ferric chloride as oxidizing agent. The preparation conditions were studied and the results showed that it is better to swell the chlor…
The lattice dynamics of 19 compounds with the sodium chloride structure have been investigated using shell models. The models are compared with existing experimentally measured phonon-dispersion curves and refined using a multidimensional downhill simplex method. Debye-Waller factors for these compounds are calculated…
beta-Poly(L-malate) is supposed to function in the storage and transport of histones, DNA polymerases and other nuclear proteins in the giant syncytical cells (plasmodia) of myxomycetes. Here we report on the biosynthesis of [14C]beta-poly(L-malate) from injected L-[14C]malate in the plasmodium of Physarum polycephalu…
The cyclic strain-hardening behaviour of copper single crystals with various slip orientations is considered systematically. It is shown that the crystallographic orientation has a strong effect on the cyclic hardening behaviours of double- and multiple-slip-oriented copper single crystals. The initial cyclic hardenin…
Background/aims: Various attempts have been made to measure mechanical properties of the skin quantitatively and noninvasively. However, no attempt has been made to measure a tactile sense of our finger that palpates the skin; when we palpate the skin to search for any change, we at first rub the skin surface softly w…
Polykristallines In2(WO4)3 wurde elektrochemisch charakterisiert und eindeutig als ein In3+ leitender Festkörperelektrolyt identifiziert. Bei Temperaturen um 250 °C–260 °C erfährt Indiumwolframat einen Phasenwechsel mit dem Übergang von einer monoklinen in eine orthorhombische Kristallstruktur. Die in der Hochtemperat…
A remarkable increase of the silver conductivity in glassy ${\mathrm{AgPO}}_{3}$ by four orders of magnitude is known to occur on adding ${\mathrm{PbI}}_{2}.$ We have investigated the structural changes that occur on ${\mathrm{PbI}}_{2}$ doping in $({\mathrm{PbI}}_{2}{)}_{0.1}{\ensuremath{-}(\mathrm{A}\mathrm{g}\mathr…
The sorption of metal ions [Cd(II), Cu(II), Co(II), Pb(II), Zn(II), Cr(III), V(IV), V(V)] from aqueous solution by Whatman cellulose ion exchangers was investigated as a function of pH. Whatman P-11 (ammonium cellulose phosphate) exhibited better performance than a fibrous anion exchanger (Whatman Cellect-Ion Exchange…
Surface modification of argon plasma-pretreated poly(tetrafluoroethylene) (PTFE) film by UV-induced graft copolymerization with 4-vinylaniline (4-VAn), followed by oxidative copolymerization of the aniline moiety of the grafted 4-VAn polymer with aniline, was carried out to render the PTFE surface conductive. The surf…
Using Monte Carlo simulation methods, we explore the role of molecular shape in the phase behavior of liquid crystals and the electroclinic effect. We study a "bent-rod" mesogen shaped like the letter Z, composed of seven soft spheres bonded rigidly together with no intramolecular degrees of freedom. For strongly angl…