Materials Literature
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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…
Abstract This paper presents a new correction procedure for quantitative x‐ray microanalysis in the environmental or variable pressure scanning electron microscope (SEM). This method is based on a plot of the measured intensity as a function of the fraction of nonscattered beam intensity, f p . The theory predicts tha…
Deuteron NMR (DNMR) measurements were performed with high-temperature and spectral resolution on the octylcyanobiphenyl (8CB) liquid crystal confined to the randomly interconnected pores of silica aerogel as a function of temperature and silica density. The aerogel density was varied by one order of magnitude and the…
A device for wrinkle recovery measurements involves the installation of a laser sensor. The shapes of fabric wrinkles are described by magnitude and sharpness using power spectra obtained from two-dimensional fast Fourier transformation and the distribution of fabric surface angles obtained from spline interpolation a…
29 Si magic‐angle spinning nuclear magnetic resonance (MASNMR) was used to study the room‐temperature hydration of C 3 S, ß‐C 2 S, and reactive ß‐C 2 S mixed with different amounts of silica fume (SF) that had been hydrated up to nine months and longer. The overall CaO:SiO 2 molar ratios of the mixes were 0.12, 0.20,…