Materials Literature
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Subsolidus compatibility data exist for a number of ternary oxide systems containing a transition metal oxide. Ternary diagrams, suitable for the present purpose, are limited mainly to those that include FeO, Fe 2 O 3 , ZnO, or Cr 2 O 3 , and these are examined in the context of Lewis acid–base interaction by consider…
Conducting polymer polyaniline and insulating polymer polycarbonate composites have been prepared. Electrical conductivity can be controlled in a wide range (more than 15 orders of magnitude) by a small amount of polyaniline. This characteristic can be explained by a percolation model. That is, at the threshold concen…
Copolymerization of 2,5‐diaminobenzenesulfonic acid (DABSA) and para ‐phenylenediamine (PPDA), respectively, with aniline (AN) was electrochemically performed by cyclic voltammetry on ‐coated electrodes in 1 M HCl. The copolymerization rate strongly depends on the amount of DABSA/PPDA in the comonomer feed. The compos…
The van Leusen pyrrole synthesis was used to assemble three potential precursors of porphobilinogen, one of which was converted to the natural product using a new method for the direct alkylation of β-hydroxymethylpyrroles.
We studied the morphology development of ternary immiscible blends through an interfacial reaction between components. This phenomenon was observed in two ternary blend systems; one is composed of polyamide(6) (PA6), polycarbonate (PC), and poly[styrene- b -(ethylene- co -butylene)- b -styrene] (SEBS), and the other i…
Synthetic tetrahedrite, Cu 12 Sb 4 S 13 , obtained by reaction of the elements, has been investigated at various temperatures in the 295–573 K range. It crystallizes in the cubic system with a = 10.3293 (6) Å, V = 1102.1 (2) Å 3 , space group I \overline 43 m and Z = 2 at room temperature. The structure refinement con…
The present paper proposes a simple shape-memory-alloy beam model, based on the classical Euler-Bernoulli beam theory. Due to restrictive kinematical assumptions, a one-dimensional constitutive equation is used. Thus, the material behavior is described through a simple l-D phenomenological model, which allows for diff…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBlue Light Emitting Nanosized TiO2 ColloidsYanjing Liu and Richard. O. ClausView Author Information Fiber & Electro-Optics Research Center Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg, Virginia 24061-0356 C…
2,2'‐Dithiodianiline (DTDA), a conducting polymer having a disulfide bond in it, has been proposed as a new class of high energy storage material. DTDA has one S‒S bond interconnected between two moieties of anilines. DTDA was electrochemically polymerized to form an electroactive thin film. The structure of the poly(…
A shape memory alloy (SMA) actuator consisting of a number of thin NiTi fibers woven in a counter rotating helical pattern around supporting disks is first described. This structure accomplishes a highly efficient transformation between force and displacement overcoming the main mechanical drawback of shape memory all…
The crystal structure of zeolite NaX (Si:Al = 1.2) and that of its complex with benzene have been determined at 5 K by Rietveld analysis of powder neutron diffraction data in space group Fd 3. For NaX, a = 25.0328(5) Å, R wp = 4.25%, and R p = 3.27%. For NaX + benzene, a = 25.0496(7) Å, R wp = 4.60%, and R p = 3.52%.…
In this paper we present a classical Monte Carlo simulation of the orthorhombic phase of crystalline polyethylene, using an explicit atom force field with unconstrained bond lengths and angles and periodic boundary conditions. We used a recently developed algorithm which apart from standard Metropolis local moves empl…
We propose a new model for the chromic mechanism in amorphous tungsten oxide films ( WO 3 − y ⋅ n H 2 O ) . This model not only explains a variety of seemingly conflicting experimental results reported in the literature that cannot be explained by existing models, it also has practical implications with respect to imp…
We describe subwavelength surfaces etched into silicon wafers that exhibit antireflection characteristics for visible light. The wafers are fabricated by holographically recording a crossed-grating in a photoresist mask followed by reactive-ion etching to transfer the primary mask onto the silicon substrate. The depen…
A hard sphere system confined between two parallel hard plates is investigated theoretically. Using extensive Monte Carlo computer simulations, the phase diagram is calculated for the whole range of densities and plate separations ranging from one to two particle diameters. There occurs a strong first-order fluid free…
Thin organic films fabricated by the successive deposition of the polyelectrolytes poly(allylamine hydrochloride) (PAH) and poly(styrenesulfonate) (PSS) have been successfully grown up to 24 layers on gold surfaces. These films are formed via electrostatic attraction between adjacent layers of opposite charge. Their c…
The current techniques for X-ray-diffraction data collection from macromolecular crystals at cryogenic temperatures are reviewed. The development of the experimental methods is outlined and the basic concepts pertaining to radiation damage and cryoprotection are summarized. Emphasis is placed on the practical aspects…
The undoped lanthanum manganite system of nominal composition ${\mathrm{LaMnO}}_{3}$ has been analyzed by neutron powder diffraction for different sample heat treatment methods. Four distinct crystallographic phases have been identified: (i) an orthorhombic phase of space group Pnma and lattice parameters (at 300 K) a…
Electrochemical capacitors can be divided into two types depending on whether the salt concentration in the electrolyte changes during charging and discharging. In the first type of capacitor, such as double‐layer capacitors, the salt concentration in the electrolyte reduces during the charging of the capacitor. The m…
The effect of specific chemical functionalities on the growth of bovine aortic endothelial cells (BAEC) was investigated using a set of well-characterized, chemically functionalized surfaces prepared by self-assembly of alkanethiolate monolayers on gold surfaces using the molecules X(CH 2 ) 15 SH with X = −CH 3, −CH 2…