Materials Literature
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The main dielectric contributions and the structure of dielectric spectrum of the ferroelectrics with diffused phase transitions are considered on the base of PbMg1/3Nb2/3O3 (PMN) crystals investigation. Dielectric spectra of the displacive, order-disorder and diffused phase transitions ferroelectrics are compared. Di…
The unique character of the triffimide anion has been revealed in a study of how the doping anion affects the properties of conducting polymer thin films using poly(3‐methylthiophene) doped with triflimide ((CF 3 SO 2 ) 2 N ⊖ ), perchlorate (CIO ⊖ ). Variations in film morphology, conductivity, and the time dependence…
Structural and dynamical studies of Optically-induced effects in SmA and SmC* liquid crystals are presented. The smectic materials are doped with photosensitive molecules capable of trans-cis isomerization under light illumination. Laser irradiation leads to the formation of strongly scattering textures with periodica…
Partial table of contents: From Electron Acceptor Molecules to Photoinduced Intramolecular Electron-Transfer Systems (N. Martin & C. Seoane). Perylene Based Conductors (M. Almeida & R. Henriques). Molecular Metals and Superconductors Based on Transition Metal Complexes (A. Kobayashi & H. Kobayashi). Conductivity and S…
Mechanical properties (Young's modulus, Poisson's ratio, mean fracture strength and Weibull modulus) of yttria-stabilised zirconia, gadolinia-doped ceria, lanthanum strontium manganate, NiO/YSZ composite and laminated ceria/zirconia structures were measured. The techniques included sonic excitation and "ring on ring"…
The noble gas krypton is shown to bind to crystallized proteins in a similar way to xenon [Schiltz, Prangé & Fourme (1994). J. Appl. Cryst. 27, 950-960]. Preliminary tests show that the major krypton binding sites are essentially identical to those of xenon. Noticeable substitution is achieved only at substantially hi…
The first star polysulfoxide 2 is synthesized by selective oxidation of a new hexaaminohexathioether 1, which gives a novel binuclear bis-tripodant species by encapsulating a pair of CuII ions.
Mordenite catalysts incorporating CeO2 in their cavities have been prepared by the hydrolysis of Ce3+ ions in the cavities with moist ammonia gas, following calcination at 550°C. The CeO2 mordenite zeolite (CeO2/MZ) is active for oxidation of p-xylene at 130°C with oxygen, but CeO2 and mordenite are inactive even at 1…
Synthesis of two water-soluble pyrrole-β brominated porphyrins, the tetrachloro salt of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(N-methyl-4-pyridinio)porphyrin [tetrakis(N-methyl pyridyl)-β-octabromoporphyrin, (Br8TMpyP)H2] and the tetrasodium salt of 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(phenyl s…
The application of a multilevel Newton method for the numerical solution of an optimal control problem governed by a phase field model is investigated. The phase field model is used to describe the phase change (e.g. liquid to solid) of materials and is given as a system of two semilinear parabolic equations. For the…
Surface treatment of carbon fibers is essential to provide adequate interfacial interaction, and strength in carbon fiber/epoxy composites. The electrodeposition of a metallic copper coating on the carbon fiber surface has been examined as an alternative method to improve carbon fiber-epoxy interfacial properties. The…
The idealized structure of κ-alumina is determined on the basis of lattice images by high-resolution electron microscopy and by applying crystallographic considerations and constraints of crystal chemistry.
The photophysical behavior of the amphiphilic cationic hemicyanine dye N - n -heptyl-4-(((dimethylamino)phenyl)ethenyl)pyridinium bromide (H7HC) has been examined in various environments with the intention to assess its state of adsorption on a TiO 2 mesoporous film. In some solvents, such as short-chain alcohols or c…
µ-Oxo-bridged group 15 element–aluminium heterodinuclear porphyrins, [(oep)(Me)M–O–Al(oep)]ClO 4 (M=P, As, Sb), are synthesized by the reaction of [(oep)(Me)M(OH)]- ClO 4 with (oep)AlMe.
Abstract The templated syntheses of TMA 2 Sn 3 S 7 and TBA 2 Sn 4 S 9 (where TMA is tetramethylammonium and TBA is n ‐tetrabutylammonium) microporous layered tin(iv) sulfides have been carried out under both microgravity (μG) and earth (1G) conditions in order to elucidate the influence of gravity on the self‐assembly…
Effects of precipitates of C11b-type structure formed by aging on the mechanical properties of a shape memory Ti–40.5Ni–10Cu alloy, which slightly off-stoichiometric to the Ti poor side, were studied by constant-load thermal cycling tests, conventional tensile tests and transmission electron microscopy. The shape chan…
Acoustic emission(AE) source characterization was carried out to examine the mechanism of delayed fracture in high strength steels. In static load delayed fracture test, incubation time for crack initiation was observed. Crack initiates at the region of maximum triaxial-stress state. After crack initiation, cracks pro…
Abstract Corrosion behaviour of steel in acid solutions was followed in presence of cationic micells of Cetyltrimethylammonium bromide (CTABr), n‐tetradecyl‐N,N,N‐trimethylammonium bromide (TDTABr), n‐dodecyltrimethylammonium bromide (DDTABr) and n‐decyltrimethylammonium bromide (DTABr) using gasometry and potentiodyn…
Amino acids recovered after standard hydrolysis are predictive indicators of the state of preservation of silk and provide a rapid method that can be applied to extremely small sample sizes. Biochemical data from 17 Japanese silk kimono lining fabrics are compared to previously reported data on occidental silks. The c…
Mesogenic and nonmesogenic functional moieties were attached as pendant groups to the cubane core for an investigation of the glass-forming ability and morphological stability of the hybrid systems. Nematogens and carbazole were found to yield hybrid systems that are nematic and isotropic, respectively, all capable of…