A Pressure Sensitive Two-Dimensional Tetracyanoquinodimethane (TCNQ) Salt of a Stable Free Radical
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Characteristics of Sparkling Base Wines Affecting Foam Behavior
Forty-four base wines, from the three white varieties for the production of sparkling wine most used in the Apellation (Certified Brand of Origin) cava, were analyzed to evaluate their foam capacity. The wines were from three different harvests and produced in eight different wineries. Foaming properties, determined w…
Dithiacrown Ether Substituted Porphyrazines: Synthesis, Single-Crystal Structure, and Control of Aggregation in Solution by Complexation of Transition-Metal Ions
The synthesis of novel magnesium, copper, and metal-free porphyrazines, peripherally substituted with dithia-7-crown-2 (MPz(7)), dithia-15-crown-5 (MPz(15)), and dithia-18-crown-6 (MPz(18)) macrocycles is reported. These compounds are prepared starting from dicyanoethylene containing crown ethers 3, 2(1), and 2(2), re…
Molecular design of amphitropic liquid crystalline carbohydrates–amphiphilic N-methyl-glucamides exhibiting lamellar, columnar or cubic mesophases
Amphiphilic 1-deoxy-1-(N-methylbenzamido)-D-glucitols display smectic, hexagonal columnar or discontinuous cubic thermotropic liquid crystalline phases depending on the number of alkyl chains attached to the benzamido group.
Description of Abrasive Particle Shape and Its Relation to Two-Body Abrasive Wear
Recent developments in the characterization of particle abrasivity are described in this paper. A new numerical particle abrasivity descriptor based on particle angularity has been developed and compared with a descriptor developed previously. The relationships of these descriptors and the reciprocated shape factor to…
Processing of nanocrystalline ceramics from ultrafine particles
The recent interest in the properties of ceramics with grain sizes less than 100 nm has created a need for processing routes with which to manufacture such ceramics. This article briefly reviews the variety of techniques currently used to manufacture ultrafine starting powders, compact the powders, and sinter them int…
Synthesis and Characterization of a New Class of μ3-OH-Bridged Trimers That Contain Octahedrally Coordinated Divalent Metal Ions Bridged by Three Acetate Ligands and a Unique Catecholate Ligand. Solid State Molecular Structures of the [(py)5MII3(OAc)3(μ3-OH)((cat)] Complexes (M = Mn(II), Fe(II), Co(II), Ni(II))
The synthesis and structural characterization of a new class of “basic” trinuclear acetate clusters with solely divalent metal ions and a central μ3-OH ligand are reported. These molecules with the [(py)5MII3(OAc)3(μ3-OH)(cat)] stoichiometry (M = Mn, Fe, Co, Ni) are X-ray isomorphous and isostructural and contain octa…
Molecular Organization in the Pseudo-hexagonal Crystalline Phase of Ethylene−Propylene Copolymers
A detailed X-ray diffraction pattern of an oriented sample of the ethylene−propylene copolymer (75 mol % of ethylene) in the pseudo-hexagonal form is presented. The comparison between the experimental diffraction intensities with the calculated intensities for ordered and disordered pseudo-hexagonal chain aggregates h…
Compounds Containing Copper−Sulfur Layers: Electronic Structure, Conductivity, and Stability
Compounds of the general formula MCu(2n)X(n)(+1), where M is a monovalent metal and X is a chalcogen, exhibit relatively high conductivity and an interesting structural pattern of copper-chalcogen layers. The electronic structure of a series of copper-sulfur layers with the Cu(2n)S(n)(+1) stoichiometry was studied usi…
Synthesis and Characterization of Linear Luminescent Schiff-Base Polyelectrolytes with Europium(III) in the Backbone1a
The first luminescent linear europium(III) Schiff-base polyelectrolytes with europium in the polymer backbone have been synthesized and characterized. Europium-containing polyelectrolytes with ligand triplet states at or above the 5 D 0 state of europium luminesce with high quantum yields, consistent with the intramol…
Multifaceted Study of CuTCNQ Thin-Film Materials. Fabrication, Morphology, and Spectral and Electrical Switching Properties
A series of CuTCNQ (TCNQ = 7,7,8,8-tetracyano- p -quinodimethane) thin-film materials were prepared by different methods or under different conditions and characterized by scanning electron microscopic analyses, infrared, Raman, and UV−vis spectral analyses, and current−voltage characteristic measurements. All of the…
Influence of Iron in the Nucleation of ⟨c⟩ Component Dislocation Loops in Irradiated Zircaloy-4
Under irradiation, the acceleration of growth of nuclear reactor components made of Zircaloy is clearly correlated to the presence of ⟨c⟩ component dislocation loops. In the early stages, these loops appear to be essentially located close to the intermetallic precipitates. At higher doses, when ⟨c⟩ component dislocati…
Zirconium Alloy E635 as a Material for Fuel Rod Cladding and Other Components of VVER and RBMK Cores
Data are given on Zr alloy E635 (Zr-l.2Sn-lNb-0.4Fe), developed in Russia as a fuel rod cladding and other component material for use in cores of VVER and RBMK types. The alloy is much superior to binary alloys with 1.0 and 2.5% Nb and Zircaloys in terms of its resistance to irradiation-induced creep and growth and no…
Diffusion of Glucose and Glucitol in Microporous and Mesoporous Silicate/Aluminosilicate Catalysts
The effective diffusivities of glucose and its linear analog glucitol were measured by a liquid chromatographic technique at 30 °C within water-filled silica and aluminosilicate catalysts of mean pore size ranging from 7.4 to 116 Å. For glucose, the effective diffusivity decreased from 1.08 × 10 -6 to 1.77 × 10 -9 cm…
Vesicle and Cell Networks: Interconnecting Cells by Synthetic Polymers
Water-soluble polymers carrying a small fraction of hydrophobic groups are able to insert these groups into the hydrophobic interior of lipid bilayers or membranes. Under certain conditions such polymers can interconnect different vesicles or biological cells. With increasing polymer concentration this leads to the fo…
An abnormal Barton–Zard reaction leading to the pyrrolo[2,3-b]indole ring system
The reaction of 3-nitro-N-(phenylsulfonyl)indole 1 with ethyl isocyanoacetate 2 under the Barton–Zard pyrrole synthesis conditions gives ethyl 8-(phenylsulfonyl)-1,8-dihydropyrrolo[2,3-b]indole-2-carboxylate 3 rather than the anticipated ethyl 4-(phenylsulfonyl)-2,4-dihydropyrrolo[3,4-b]indole-3-carboxylate 4.
Mechanically Activated MoO3. 5. Redox Behavior
Mechanical activation leads to a variety of defects in MoO 3 . The behavior of paramagnetic defects in unmilled MoO 3 and in MoO 3 mechanically activated in a planetary mill for 600 min was investigated by ESR spectroscopy. MoO 3 milled for 600 min, and unmilled MoO 3 though in a smaller concentration, contain Mo 5+ i…
Electrical switching in VO 2 sol–gel films
Vanadium dioxide thin films have been made from vanadium oxoalkoxides. The precursor solution is spin-coated onto a silica substrate and heated under a reducing atmosphere. These VO2 films exhibit well known insulator–metal transition at around 67 °C. Electrical switches have been made from such films that reversibly…
Wetting Kinetics in Surface Capillary Grooves
For V-shaped surface grooves in copper, we have obtained the capillary driven flow kinetics for two liquids: unreactive 1-heptanol and eutectic Sn/Pb solder, which is known to react with copper. We show experimentally that the flow of both liquids in these grooves follows the classical Washburn kinetics, i.e., a Poise…
Controlled Molecular Weight Polyimides from Poly(amic acid) Salt Precursors
Controlled molecular weight, thermoplastic polyimides have been prepared via poly(amic acid) salt precursors. 2,2-Bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and m -phenylenediamine (the Ultem monomers), together with calculated amounts of phthalic anhydride were reacted in N -methylpyrrolidinone as well as…