Materials Literature
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Changes in the electronic structure of multiwalled nanotubes due to the introduction of boron in the lattice are identified using scanning tunneling spectroscopy. Doped tubes are metallic with no apparent band gap, in contrast to undoped tubes with varying electronic character. Combined with ab initio calculations, we…
The effect of initial take-up speed on the properties and structure of both as-spun and drawn/heat-set poly(ethylene terephthalate) filaments was characterized through measurements of birefringence, percent crystallinity, tensile properties, high temperature shrinkage, loss tangent temperature dependence, DSC melting…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInfluence of the Conformation on Chemical Modification of Polymers: Study of the Quaternization of Poly(4-vinylpyridine)†Christian Chovino and Philippe GramainView Author Information Ecole Nationale Supérieure de Chimie, Laboratoire…
The accelerated effects of immersion in seawater at 60°C, in comparison to distilled water, on a vinyl ester resin and on its highly quartz particles filled system were studied. The studied resin was cured at room temperature for 48 h and postcured at 100°C for 12 h, and the filled system contained 93 wt % quartz part…
Photopolymerization of aniline derivatives was revealed to be induced by photoinduced electron transfer (PIET) between the tris(2,2‘-bipyridyl)ruthenium complex [Ru(bpy) 3 2+ ] and electroactive molecules. Since the initial photopolymerization reaction depended on PIET between Ru(bpy) 3 2+ and N -phenyl- p -phenylened…
Fracture toughness characterized by the J-integral method has been evaluated along injection-molded bars of isotactic polypropylene. A significant increase in toughness with decreasing distance from the specimen gate has been observed with maximum steepness of the dependence in the central part of the specimen length.…
Pressure tuning is a potentially useful tool to increase the rate of discovery of solid-state materials with improved properties. The interaction parameters that determine the properties of a given material define a phase space, which can have one or more dimensions. A single solid-state compound can be represented by…
We report time profiles of transient grating diffraction signals created by crossed beam excitation of 170 μm thick nematic MBBA film. At the excitation wavelength of 355 nm and the irradiance of 10 mJ/cm 2, corresponding to a strong absorption condition, the signal consists of four distinguishable components in the t…
Aluminum pigments react in aqueous alkaline media (e.g., water-borne paints) by the evolution of hydrogen. Maleic acid copolymers, which were synthesized by copolymerization of maleic acid anhydride, styrene, and acrylic esters (ethyl-, n-butyl-, n-hexyl-, n-dodecyl-, and n-octadecyl acrylate) inhibit this corrosion r…
Pure black CuClCu 2 TeS 3 was prepared by reaction of stoichiometric amounts of CuCl, Cu, Te, and S in evacuated silica ampules. The crystal structure was determined from single crystals at room temperature. The compound crystallizes in the rhombohedral system, space group R 3 m with a = 7.361(1) Å and c = 10.401(1) Å…
The use of inexpensive potassium-containing coal chars for NO x reduction in a fuel-lean (oxygen-rich) environment has been investigated. Coals of different rank have been used as char precursors. Two types of experiments were performed to study the kinetics of the NO x /carbon reaction: (i) temperature-programmed rea…
A series of molecular rectangles have been synthesized by self-assembly using Re(CO)5OTf, 4,4‘-bipyridine and an alcohol or water. The rectangles have been characterized by elemental analysis as well as IR, 1H NMR and UV−visible spectroscopies, and in one case cyclic voltammetry and an X-ray structure determination. T…
An analysis of the crystal structure of the β polymorph of isotactic polypropylene (β-iPP) is carried out with the methods of molecular mechanics, taking into account simultaneously intra- and intermolecular interactions. Results indicate that efficient crystal packing may be achieved in a number of different, nearly…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInfluence of Entanglements on Crystallization of MacromoleculesHaishan Bu, Fangming Gu, Lirong Bao, and Min ChenView Author Information Department of Materials Science, Fudan University, Shanghai 200433, China Cite this: Macromolecu…
c -Axis oriented thin films of (ZnO) 5 In 2 O 3 of 0.5 μm thickness were deposited on glass substrates by a radio-frequency-sputtering method. The thin films had dense columnar structures and were highly transparent in the ultraviolet−visible region, simultaneously showing low electrical resistivity. The refractive in…
Thin films of tetrathiafulvalene (TTF) derivatized polythiophenes were prepared by electropolymerization of precursors based on bithiophene or hybrid thiophene−ethylenedioxythiophene (EDOT). The cyclic voltammogram of these polymers exhibits an additional anodic wave between the two oxidation steps corresponding to th…
Noncentrosymmetric materials are of special interest in materials chemistry owing to their technologically important properties, such as ferroelectricity and second-order nonlinear optical behavior. Over 500 noncentrosymmetric oxides have been compiled and categorized by symmetry-dependent property and crystal class.…
We discuss the ground state and some excited states of the half-filled Hubbard model defined on an open chain with L sites, where only one of the boundary sites has a different value of chemical potential. We consider the case when the boundary site has a negative chemical potential -p and the Hubbard coupling U is po…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAn Organic Catalytic System for Dehydrogenative OxidationToshikazu Hirao and Shinya FukuharaView Author Information Department of Applied Chemistry, Faculty of Engineering, Osaka University, Yamada-oka, Suita, Osaka 565-0871, Japan Cite this: J. Org. Chem. 1998, 63, 21, 7534–75…
It has been experimentally established in numerous cases that precipitation of monodispersed colloids from homogeneous solutions is a complex process. Specifically, it was found that in many systems nuclei, produced rapidly in a supersaturated solution, grow to nanosize primary particles (singlets), which then coagula…