Materials Literature
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The effect of a phosphate treatment as a corrosion inhibitor for a RE-iron-boron magnet has been investigated. The corrosion characteristics of the magnet in a phosphate solution, which consisted of 0.15 M NaH/sub 2/PO/sub 4/, were analyzed by electrochemical impedance and electrochemical noise measurements. The immer…
Different self-consistent field (SCF) iteration schemes for open-shell systems are discussed. After a brief summary of the well-known level shifting and damping procedure, we describe the quadratically convergent SCF (QCSCF) approach based on the gradient and the Hessian matrix in a space of orbital rotation parameter…
Abstract The Sillenite type Bi 24 B 2 O 39 is an incongruently melting compound at T p = 650 ° C . Single crystals have been grown from non‐stoichiometric melts as well as from high temperature solutions by the Czochralski method and by a top seeded solution growth technique (TSSG), respectively. The main difficulty i…
The ruthenium(II) complex salts [Ru(NH 3 ) 5 L][PF 6 ] 2 [L = coumarin 510 (C-510) 1 or coumarin 523 (C-523) 2] have been synthesized and fully characterized. Their Ru III analogues [Ru(NH 3 ) 5 L][PF 6 ] 3 (L = C-510 3 or C-523 4) have been prepared by oxidation of 1 or 2, respectively, with AgO 2 CCF 3 . Electronic…
A simple modification of surface spreading that enables easy examination of subcellular structures by both transmission electron microscopy (TEM) and atomic force microscopy (AFM) was developed in the present study. Specimens were adsorbed onto carbon-coated electron microscopy (EM) grids with parlodion backing for co…
By means of electrochemical and quantitative histomorphometric methods, the corrosion resistance and tissue biocompatibility of Ti50Ni50 and Ti50Ni50-xCux (x = 1, 2, 4, 6, 8) were investigated. It is discovered that the repassivation potential of Ti50Ni50-xCux (x = 2, 4, 6, 8) alloys is about 200 mV higher than that o…
Abstract Alloys intended for use in high-temperature environments rely on the formation of a continuous, compact, slow-growing oxide layer for oxidation, and hot corrosion resistance. This article focuses on the issues related to high-temperature oxidation of superalloys used in gas turbine engine applications. It dis…
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Organic-inorganic hybrid materials synthesized via sol-gel processing are excellent solid matrices for photochromic dyes like spirooxazine, and the photochromic performance can be further enhanced by introducing suitable additives. This work describes the effects of additives on the photochromic intensity (Δ…
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…