Materials Literature
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Abstract The preparation and characterization of ferrite‐ and carbon black‐filled ethylene‐propylene‐ethylidene norborene terpolymer rubber composites were studied for microwave applications. Both the insertion loss and return loss were measured in a high‐frequency range (X‐band) with a network analyzer. The results i…
The review concerns the main chemical and physicochemical properties and the methods of modification of carbon nanotubes, a novel promising material. The feasible and potential fields of applications of carbon nanotubes are outlined. The bibliography includes 573 references.
Magnetic, transport, and optical measurements performed on ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.5}$ under pulsed magnetic fields up to 35 T have allowed us to determine its complete ${\ensuremath{\mu}}_{0}H\ensuremath{-}T$ phase diagram. A first-order field-induced transition takes place below the N\'eel point ${(T}_…
Abstract The effects of chemical crosslinking on the thermal and dynamic mechanical properties of a polyurethane system were examined. The polyurethanes were prepared from poly(propylene glycol), a diol; trimethylolpropane propoxylate, a triol; and poly(propylene glycol), tolylene 2,4‐diisocyanate terminated, a diisoc…
We develop a version of the vacancy mediated tracer diffusion model, which follows the properties of the physical system of In atoms diffusing within the top layer of Cu(001) terraces. This model differs from the classical tracer diffusion problem in that (i) the lattice is finite, (ii) the boundary is a trap for the…
We have used the indium/copper surface alloy to study the dynamics of surface vacancies on the Cu(001) surface. Individual indium atoms that are embedded within the first layer of the crystal, are used as probes to detect the rapid diffusion of surface vacancies. STM measurements show that these indium atoms make mult…
The investigation of colour symmetries for periodic and aperiodic systems consists of two steps. The first concerns the computation of the possible numbers of colours and is mainly combinatorial in nature. The second is algebraic and determines the actual colour symmetry groups. Continuing previous work, we present th…
The interference between extrinsic and intrinsic losses in x-ray absorption fine structure (XAFS) is treated within a Green's function formalism, without explicit reference to final states. The approach makes use of a quasi-boson representation of excitations and perturbation theory in the interaction potential betwee…
Using both a recent calculation by Bruch of the damping of the motion of a monolayer nitrogen film oscillating harmonically on a metallic surface due to Ohm's law heating and a Thomas-Fermi approximation treatment of the Ohm's law heating mechanism, which accounts for the nonzero thickness of the surface region of a m…
Discrete catalytic nanoparticles with diameters in the range of 1−2 nm and 3−5 nm respectively are obtained by placing controllable numbers of metal atoms into the cores of apoferritin, and used for growth of single-walled carbon nanotube (SWNTs) on substrates by chemical vapor deposition (CVD). Atomic force microscop…
The thermal conductivity and thermoelectric power of a single carbon nanotube were measured using a microfabricated suspended device. The observed thermal conductivity is more than 3000 W/K m at room temperature, which is 2 orders of magnitude higher than the estimation from previous experiments that used macroscopic…
The soaps of alkaline earth's and transition elements and closed ‘d’ orbitals were prepared by the double decomposition method by the reaction between metallic salts and sodium palmitate. The thermal stability of these soaps was studied in order to throw the light on their suitability for using as catalysts or lubrica…
Abstract Fiber‐forming poly(urethane semicarbazide)s were prepared with poly(butylene adipate)glycol as soft‐segment domains and hexamethylene diisocyanate/terephthalic dihydrazide as hard‐segment domains. The hard‐segment content was varied via variations in the polyol/isocyanate molar ratio, and the films were chara…
Recent developments in NMR have extended the size range of proteins amenable to structural and functional characterization to include many larger proteins involved in important cellular processes. By applying a combination of residue-specific isotope labeling and protein deuteration strategies tailored to yield specif…
The aim of this paper is to gain insight into the observed recovery of electrical activity of B impurities occurring in Porous Silicon (PS) layers exposed to ${\mathrm{NO}}_{2}$ molecules, while addressing the problem of the origin of B passivation in PS. Two possible mechanisms are considered, i.e., that the extra el…
We present results of adsorption measurements for Xe and Ar which confirm experimentally the formation of one-dimensional phases for these gases when adsorbed on the outer surfaces of close-ended single-wall carbon nanotube (SWNT) bundles. The existence of such phases had been predicted in recent computer simulations,…
Abstract We studied tensile behavior of low‐molecular‐weight (MW) polypropylene (PP)/ethylene–propylene rubber (EPR; 70/30) blends from the viewpoint of the MWs of PP and EPR and the compatibility between PP and EPR. The value of the melt flow rate of PP varied from 30 to 700 g/10 min at 230°C. We studied the compatib…
Abstract We carried out a scanning electron microscopy study to investigate the morphology of a polystyrene (PS)/montmorillonite nanocomposite. Monodispersed spherical particles, about 200 nm in diameter, were observed when PS/montmorillonite powder was dispersed in water, whereas planar silicate sheets were found for…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTAntiferromagnetic Ordering in a Helical Triblock Copolymer MesostructureHubert Elbs, Volker Abetz, Georges Hadziioannou, Clarissa Drummer, and Georg KrauschView Author Information Lehrstuhl für Physikalische Chemie II and Bayreuther Zen…
A time-resolved, spectroscopic study of the third-order nonlinear optical response of rare-earth hexagonal manganites $R{\mathrm{MnO}}_{3}$ $(R=\mathrm{Sc},$ Y, Er) was performed in the range of 1.45 to 1.62 eV nearby the first $d--d$ transition in ${\mathrm{Mn}}^{3+}$ ions. The nonlinearity was shown to result in a t…