Materials Literature
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Liquid crystal cells containing a homogeneously aligned calamitic liquid crystalline semiconductor, 2-(4-octylphenyl)-6-dodecyloxynaphthalene, doped with dyes such as 3-(2-benzothiazolyl)7-diethylaminocoumarin, emitted a visible light when a dc bias was applied. This light emission occurred irrespective of phase, and…
We report measurements of the Seebeck coefficients of boron carbides having compositions ${\mathrm{B}}_{12+x}{\mathrm{C}}_{3\ensuremath{-}x}$, $0.15<x<1.7$, from 6 to 900 K. These Seebeck coefficients are large, $\ensuremath{\approx}200\ensuremath{\mu}\mathrm{V}/\mathrm{K}$ at 300 K, despite boron carbides havin…
We present an accurate x-ray powder diffraction study of stoichiometric solid solutions performed using an internal-standard method. The results obtained allowed us to establish for the first time that the composition dependence of the lattice parameter a ( c ) is not linear, as had been asserted, and interpreted with…
We have performed the first ab initio investigation of the boron compound BSb with zinc-blende structure, and have compared its structural and electronic properties with those of other boron compounds such as BN, BP, and BAs. The calculations are performed using a plane-wave expansion within the local density approxim…
Interactions between proximal probe tips composed of carbon nanotubules (CNTs) and diamond and graphene surfaces are investigated using molecular dynamics simulations. The simulations reveal the mechanisms of buckling, bending, slipping, and elastic recovery of the CNT tips on these surfaces and suggest that they will…
By integrating out the degrees of freedom of the small spheres in a binary mixture of large and small hard spheres, we derive an explicit effective Hamiltonian for the large spheres. Using the two-body (depletion potential) contribution to this effective Hamiltonian in simulations, we find stable fluid-solid and both…
Carbon nanotube tips are explored in fabricating oxide nanostructures on silicon surfaces with an atomic force microscope. Nanotubes can write nanostructures at speeds up to 0.5 mm/s over large surface areas, and present a solution to the long-standing tip-wear problem. Experimental and theoretical work find that nano…
We show that the first non-linear correction to the linearised Poisson-Boltzman n (or DLVO) theory of effective pair interactions between charge-stabilised, co lloidal particles near a charged wall leads to an attractive component of entro pic origin. The position and depth of the potential compare favourably with rec…
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…