Materials Literature
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The metalloporphyrin-catalyzed oxidation of 2-methynaphthalene (1) by potassium monopersulfate produced mainly two naphthoquinones: 2-methyl-1,4-naphthoquinone (2) (menadione or vitamin K(3)) and 6-methyl-1,4-naphthoquinone (3). In aqueous solution and at room temperature in the presence of 5 mol % of the water-solubl…
The complexation of TTF 2 and cyclobis(paraquat- p -phenylene) 1 4+ has been studied by cyclic voltammetry and by spectroelectrochemistry: shifts in the redox potentials for the TTF and the 1 4+ components of 45 and 30 mV, respectively, occur upon complexation. Decomplexation of 2·1 4+ upon oxidation of the TTF unit t…
The preparation and catalytic properties of bimetallic colloids consisting of a ligand-stabilized Pt shell on Au or Pd cores supported by alumina are described. The aim of this work is to study the influence of the electronegativity of the colloidal core metals on the activity and selectivity of the surface Pt in hydr…
Highly nonlinear chromophores with good thermal stabilities (> 250 °C) are required if organic polymeric materials are to be developed for electro‐optical (EO) applications. The synthesis and characterization of highly efficient and thermally stable diphenylamino‐substituted thiophene stilbenes (e.g., see Figure) a…
In the present paper, we analyse several activation configurations of embryonic dislocations nucleated from the tip of a cleavage crack. The activation configurations include nucleation on inclined planes, on oblique planes and on cleavage ledges and are treated within the classical framework of Peierls. A variational…
Type V collagen became solubilized in softened sardine muscle after 1 day of chilled storage with the concomitant weakening of pericellular connective tissue induced by disintegration of thin collagen fibrils. However, no significant changes were observed in the structure of interstitial connective tissue or biochemic…
F s + (H) color centers at the surface of MgO have been studied using a combined EPR and quantum chemical approach. F s + (H) are paramagnetic excess electrons centers where the unpaired electron is trapped in a surface anion vacancy. They are formed at the surface of thoroughly dehydrated MgO (1073K) upon UV irradiat…
We report the derivatization of hyperbranched poly(acrylic acid) (PAA) films with a wide range of amino- or alcohol-terminated molecules. These molecules can include moieties such as pyrene, ferrocene, poly(ethylene glycol), 15-crown-5, and a dye. To derivatize PAA films, we activate their carboxylic acid groups with…
We have studied the variation of the paramagnetic to ferromagnetic transition temperature TC and of the ferromagnetic to antiferromagnetic transition temperature TN as a function of the average size of the A site cations (Ln, Sr) in the manganite perovskites Ln0.5Sr0.5MnO3 (Ln=Gd, Sm, Y, Pr, La). For our investigation…
We study the kinetics of order-disorder and order-order transitions in weakly segregated diblock copolymers using a time-dependent Ginzburg-Landau (TDGL) approach. In particular, we investigate the microstructural change as well as the order-parameter evolution after a sudden temperature jump from one phase to another…
Cyanide-bridged bimetallic assemblies [Ni(pn) 2 ] 2 [Fe(CN) 6 ]X·cat n H 2 O (X = ClO 4 - and n = 2 ( 1 ); X = BF 4 - and n = 2 ( 2 ); X = PF 6 - and n = 2 ( 3 )) and [Ni(1,1-dmen) 2 ] 2 [Fe(CN) 6 ]X· n H 2 O (X = ClO 4 - and n = 2 ( 4 ); X = BF 4 - and n = 3 ( 5 ); X = PF 6 - and n = 2 ( 6 ); X = CF 3 SO 3 - and n =…
High-resolution dilatometry measurements have been made for ${\mathrm{SrTiO}}_{3}$ along the tetragonal-phase a and c axes and the cubic-phase [100] direction between 2 and 280 K. A moderate stress field was used to align the domains of the low-temperature tetragonal phase or to force a single domain. Anisotropy in th…
The lattice parameter of undoped and boron doped polycrystalline diamond films has been measured up to 8×1020 B cm−3. It varies slightly according to the three crystallographic directions [111], [220], and [311] investigated here. The cell parameters for the undoped films are within the published values for synthetic…
The specific heat of Na0.5Bi0.5TiO3 crystal in the temperature range 300–650 K and the changes of spontaneous polarization of Na0.5Bi0.5TiO3 ceramic in the temperature range 4.2–90 K were measured. The calorimetric measurements showed that the anomaly of specific heat exists in the temperature range where the phase tr…
Polyvinylchloride (PVC) films containing different amounts of NiCl 2 have been prepared using a casting method. The UV/VIS (200-800 nm) and IR (200-4000 cm −1 ) spectra and dc electric conductivity have been investigated. One optical absorption edge was found for pure PVC, while the addition of NiCl 2 led to the appea…
Article Hydrogen Solubility and Thermodynamics of Hydrogen Absorption in Palladium-rich Binary Pd1−xZx and Ternary Pd1−x−yZxZ′y Solid Solution Alloys was published on February 1, 1997 in the journal Zeitschrift für Physikalische Chemie (volume 199, issue 2).
Abstract Sulphosalts in the system CuSbS 2 -CuBiS 2 (chalcostibite-emplectite) form a complete solid solution series. Seven compositions with the general formula Cu(Sb x Bi 1– x )S 2 have been synthesized using dry methods at 310°C. All members of the series are orthorhombic (space group Pnma ) and show smoothly incre…
Films of poly(ethylene terephthalate) (PET) have been subjected to a low frequency (70 kHz) helium discharge, with a non-symmetrical configuration of electrodes, in order to study the treatment conditions for which the `ageing' effect is slowed down. Treatments were made for different gas flow rates (40, 70 and 100 sc…
Solid NMR of 13 C isotope-labeled samples of PMR-15 was used to follow the cross-linking reaction of the nadic end cap. Some samples were labeled on one of the carbon atoms of the nadic end cap, and others on the methylene carbon atom of the methylenedianiline portion of the polymer. NMR spectra were run on these samp…
Some alloys containing fine, undeformable, second-phase particles (typically, 25 nm < diameter < 1 μm; 8 nm < interparticle-spacing < 0.5 μm) can display either accelerated or retarded recrystallization depending on the particle dispersion parameters. The recrystallization of a series of such alloys, internally oxidiz…