A planar binuclear phthalocyanine and its dicobalt derivatives
The synthesis, characterisation, and intramolecular interactions of a metal-free planar binuclear phthalocyanine and its cobalt derivatives are described.
Materials Literature
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Electric conductivity and phase diagram of a mixed-stack charge-transfer crystal: Tetrathiafulvalene-p-chloranil
The electric conductivity has been measured on the mixed-stack charge-transfer crystal tetrathiafulvalene (TTF) -p-chloranil (CA) as a function of temperature (T>30 K) and pressure (P<11 kbar). On the basis of the experimental results, a P-T phase diagram is presented for the charge-transfer state in TTF-CA.
Guided modes and surface plasmon-polaritons observed with a nematic liquid crystal using attenuated total reflection
An aligned layer of nematic liquid crystal with suitable optical anisotropy and under the application of appropriate applied voltages, may support various guided modes of light. Here the attenuated total reflection technique is used to examine such guided modes allowing simultaneous observation of the surface plasmonp…
Characterization and properties of polyethylene blends II. Linear low‐density with conventional low‐density polyethylene
Abstract Melting and crystallization phenomena in blends of a linear low‐density polyethylene (LLDPE) (ethylene butene‐1 copolymer) with a conventional low‐density (branched) polyethylene (LDPE) are explored with emphasis on composition by differential scanning calorimetry (DSC) and light scattering (LS). Two endother…
A real-space computer-based symmetry algebra
A computer-based symmetry algebra is described which permits the reconstruction of an infinite bond network from the asymmetric connectivity without an a priori knowledge of atomic coordinates. The algebra requires not only an algorithmic ordering of the Wyckoff groups but the designation of one site in each Wyckoff g…
Rapid and Slow Phosphate Sorption by Mediterranean Soils: Effect of Iron Oxides
Abstract The rate of phosphate sorption (for different levels of P application) by the clay fractions of 20 soils of Mediterranean Spain ranging widely in mineralogical properties could be described by a modified Freundlich equation. The coefficient giving the P sorbed at unit concentration and unit time (taken as a m…
Finite Element Analysis of Thermal Stress of the Metal/Ceramic Multi-Layer Composites with Controlled Compositional Gradients
The effect of interlayers having controlled compositional gradients on the residual thermal stress distributions of stainless steel/silicon nitride and tungsten/zirconia bondings was studied by the finite element method. A cylindrical model for the sample geometry and stepwise compositional variations in the interlaye…
Tungsten(VI) equilibria: a potentiometric and calorimetric investigation
Tungsten(VI) equilibria has been investigated in the range pH 5–7.8 (corresponding to a degree of protonation, Z≲ 1.2) by potentiometric and enthalpimetric titrations at 25 °C in 1.0 mol dm–3 NaCl. The potentiometric data were treated with the computer program SUPERQUAD to examine a large number of reaction models. Th…
Two Kinds of Switching Processes in Surface Stabilized Ferroelectric Liquid Crystals
Two kinds of molecular reorientation processes in SSFLC cells were observed. One (a) is accompanied by the nucleation and growth of domains and the other (b) proceeds by uniform brightness change without any domain formation throughout a cell. In transmittance change, (a) and (b) are also explained by two-step and sin…
Ethanol promotion by the addition of cerium to rhodium–silica catalysts
The selectivity of rhodium-based catalysts is very dependent on the choice of support or the promotors. Cerium oxide is very effective for ethanol promotion when added to Rh/SiO2 catalysts or used as support (70–80% ethanol selectivity). The role of the cerium oxide has been studied by various techniques, namely chemi…
Morphological partitioning of ethyl branches in polyethylene by carbon-13 NMR
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphological partitioning of ethyl branches in polyethylene by carbon-13 NMRE. Perez, D. L. VanderHart, Buckley Crist Jr., and P. R. HowardCite this: Macromolecules 1987, 20, 1, 78–87Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Publi…
Studies on transition-metal peroxo complexes. Part 7. Molybdenum( VI ) and tungsten( VI ) carboxylato peroxo complexes, and the X-ray crystal structure of K 2 [MoO(O 2 ) 2 (glyc)]·2H 2 O
New complexes [MoO(O2)2L]2–[L = malate, tartrate (tart), tartronate, quinate, or glycolate (glyc)], [WO(O2)2L]2–(L = citrate, tartrate, malate, or glycolate), and [W2O2(O2)4(tart)]4– are reported, and modified preparations given for [MO(O2)2L]2– and [MO2(O2)L(H2O)]2–(M = Mo or W; L = oxalate). Raman and i.r. spectra o…
Anionic photocatalysts supported in layered double hydroxides: intercalation and photophysical properties of a ruthenium complex anion in synthetic hydrotalcite
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnionic photocatalysts supported in layered double hydroxides: intercalation and photophysical properties of a ruthenium complex anion in synthetic hydrotalciteEmmanuel P. Giannelis, Daniel G. Nocera, and Thomas J. PinnavaiaCite this: Inorg. Chem. 1987, 26, 1, 203–205Publica…
Polyaniline: non-oxidative doping of the emeraldine base form to the metallic regime
Evidence is provided which proves that the emeraldine base form of polyaniline is ‘doped’ by protonic acids to the metallic conducting regime by a process involving neither oxidation nor reduction of the polymer, thus introducing a new concept of doping to the conducting polymer field.
Friction and Wear Behavior of Hard Carbon Films
The friction and wear properties of hard carbon films deposited by a hot cathode glow discharge in ethylene or methane were examined by using a reciprocating tribometer in vacuum and in air. A hard carbon film composed of mixed diamond and graphite crystal shows high friction in vacuum. On the other hand, hard carbon…
Corrosion of metallic implants
The human body is a mildly corrosive environment with a certain salt level and a low oxygen content. High corrosion resistance is demanded for implants to obtain biocompatibility and because even minor corrosive attack and low failure frequency are unacceptable. Degradation processes of the commonly used implant mater…
Cathodic delamination of polybutadiene from steel-A review
The variables influencing the rate of the cathodic delamination of polybutadiene from steel in alkali halide solutions are discussed. The bond at the interface arises from the reaction of carboxyl groups in the polybutadiene with hydroxyl groups on the surface of the iron oxide at the interface. It is this bond that i…
Dislocations and plasticity in semiconductors. II. The relation between dislocation dynamics and plastic deformation
In this second part, the mechanical behaviour of elemental semiconductors (ESC) and III-V compounds (CSC) is briefly reviewed. The marked temperature dependence of the stress-strain curve is recalled first and some attention is paid to the correlation between the lower yield stress and dislocation dynamics at moderate…
Thermal Cycling Effects in an Aged Ni-rich Ti–Ni Shape Memory Alloy
Thermal cycling effects in an aged Ni-rich Ti–Ni shape memory alloy have been examined by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), changing aging temperature and time, temperature range for thermal cycling, and the number of thermal cycles up to 104 times. Two kinds…
New iron(II) spin-crossover complexes with heterocyclic amine-derived ligands and STEPS experiments on photogenerated metastable high-spin states
Cationic complexes of the type [Fe(LNN)3]2+ and [Fe(LNNN)2]2+ have been isolated as Cl–, ClO4–, or BF4– salts, where LNN and LNNN represent bidentate and tridentate nitrogen-donor ligands respectively. The bidentate ligands were 2-(2′-pyridyl) benzimidazole (pybtim), 2-(2′-pyridyl)-N-methylbenzimidazole (mpybzim); 2-(…