Materials Literature
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We present a review of some results concerning electronic transport properties of quasicrystals. After a short introduction to the basic concepts of quasiperiodicity, we consider the experimental transport properties of electrical conductivity with particular focus on the effect of temperature, magnetic field, and def…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSolid-Supported Hyperbranched Polymerization: Evidence for Self-Limited GrowthP. Bharathi and Jeffrey S. MooreView Author Information Roger Adams Laboratory, Departments of Chemistry and Materials Science & Engineering The Beckman Institute for Advanced Science and Tec…
A model is proposed to describe all experimental results on electrical aging of cables reported in Part 1. It is based on simple thermodynamics concepts in the Eyring theory, includes the concept of submicrocavity formation proposed by Zhurkov, and supposes that the first step in electrical aging is essentially a mole…
The photo-oxidative stability of various annelated and substituted tetraazaporphyrin derivatives were investigated in N , N -dimethylformamide by irradiation in the presence of air. First-order rate constants were calculated. In addition, the positions of the HOMO and LUMO energy levels of the compounds were calculate…
The evaporation of silicon carbide (SiC) ceramics during sintering has been studied by thermogravimetry in a graphite furnace filled with argon. The SiC powder compacts contained 7.5 wt% eutectic composition of Y 2 O 3 –Al 2 O 3 to promote liquid‐phase sintering. A weight loss of 1–11 wt% was observed during sintering…
Polycrystalline boron nitride (BN) films are synthesized using BCl 3 and N 2 as source gases, by plasma-assisted chemical vapor deposition. BN films consist of nanocrystalline grains of 3 nm in size. The energy gap is estimated to be 6.0 eV from ultraviolet-visible optical transmission measurement. The electrical resi…
Shape memory alloys (SMAs) have several unique characteristics, including their Young's modulus-temperature relations, shape memory effects, and damping characteristics. The Young's modulus of the high-temperature austenite of SMAs is about three to four times as large as that of low-temperature martensite. Therefore,…
Unidirectional elongation of magnetic field sensitive polymer gels, called ferrogels, have been studied. In ferrogels, finely distributed colloidal particles having superparamagnetic behavior are incorporated into a swollen network. These particles couple the shape of the gel to the nonuniform magnetic field. Shape di…
In its physiological solid state, type I collagen serves as a host for many types of cells. Only the molecules on fiber surface are available for interaction. In this interfacial environment, the conformation of a cell binding domain can be expected to fluctuate between the collagen fold and a distinctive non-collagen…
{5-[[[2‘,5‘-Bis[(4‘‘-( n -(perfluoroalkyl)alkoxy)benzoyl)oxy]benzyl]oxy]carbonyl]bicyclo[2.2.1]hept-2-ene}s were polymerized by ring-opening metathesis polymerization in THF at 40 °C using Mo(CHCMe 2 Ph)(N-2,6- i Pr 2 Ph)(O t Bu) 2 as the initiator. 2,5-Bis[(4‘-( n -(perfluoroalkyl)alkoxy)benzoyl)oxy]toluenes mimic bo…
A method to fabricate one dimensional nanoscale composite based on coating of carbon nanotube with metal is proposed and demonstrated in this letter. Carbon nanotubes have been coated with a layer of nickel by electroless plating. It was found that the nickel coating had a tendency to form as nanoparticles on the surf…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPolyphosphazene Block Copolymers via the Controlled Cationic, Ambient Temperature Polymerization of PhosphoraniminesHarry R. Allcock, Scott D. Reeves, James M. Nelson, Chester A. Crane, and Ian MannersView Author Information Departm…
A new series of nonlinear optical molecules are described where the ground state polarization is predominantly zwitterionic when the molecules are dissolved in solution. The molecules, which are derived in general from facile reactions between tertiary amines and tetracyano- p -quinodimethane (TCNQ), are of a type whe…
Refractive indices and extinction coefficients have been calculated for 14 oxide and fluoride thin films over a wavelength range of 0.6-12 mum. Results from adhesion, abrasion, and humidity testing have been included to characterize the durability of each film. The data allow selection of the best oxide and fluoride m…
We propose here a new enzyme immunoassay based on surface-enhanced Raman scattering (SERS). In the proposed system, antibody immobilized on a solid substrate reacts with antigen, which binds with another antibody labeled with peroxidase. If this immunocomplex is subjected to reaction with o -phenylenediamine and hydro…
Molecular structure in the interlayers of lithium-Wyoming montmorillonite with one, two, or three adsorbed water layers was investigated for the first time by concurrent Monte Carlo and molecular dynamics simulation, based on the MCY model of water−water interactions. Calculated layer spacings, as well as interlayer-s…
Abstract The composites investigated in this article were epoxy resins reinforced with jute‐fibers. The jute‐fibers were modified with an epoxyfunctional‐γ‐glycidoxypropyltrimethoxy‐silane (A‐187 from Osi‐Specialtis GmbH, Germany), which works as a coupling agent between fiber and matrix. The introduction of the coupl…
The elastomeric behavior of low-crystallinity ethylene−octene copolymers prepared by Dow's INSITE constrained geometry catalyst technology is described. Deformation in uniaxial tension was examined as a function of comonomer content and molecular weight. Within the melting range of copolymers, temperature was used as…
Microelectrochemical studies for hydrogen storage materials have been carried out by using a microelectrode technique. A carbon fiber filament was contacted with single particles of , and in 1 M KOH solutions by using a micromanipulator, where Lm indicates the lanthanum‐rich rare‐earth metal. In this way, cyclic volta…
Acid−base properties of branched, weak polyelectrolytes are analyzed theoretically by means of Ising models with short-range interactions. Assuming that the structure of the branched polyelectrolyte can be approximated by the topology of a tree (no closed loops), the Ising model with nearest neighbor pair interactions…