Materials Literature
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We have investigated the adsorption of hydrogen of multiwall carbon nanotubes synthesized by the pyrolysis method using a lanthanum nickel hydrogen storage alloy as a catalyst. The mechanism of carbon nanotubes synthesized using a La–Ni alloy catalyst is discussed. In the hydrogen atmosphere and high-temperature proce…
Clustering of Mg in Al–Mg binary alloys is studied by means of atomistic simulations. The phenomenon is analysed in the undistorted Al lattice, as well as in the presence of dislocations. In the undistorted lattice, Mg has a tendency to cluster in a coherent phase. The binding energy of this structure is rather low an…
Gd nanoparticles and carbon coated Gd/GdC2 nanocapsules have been prepared by means of arc discharge in argon and methane, respectively. In the Gd nanoparticles, gadolinium oxide was detected by x-ray diffraction, while the presence of metallic gadolinium was proved by oxygen analysis and x-ray photoelectron spectra.…
Under a static high magnetic field of 10 T, diamond-like carbon (DLC) nanocrystals and graphite-coated n-diamond nanoparticles have been synthesized after a pyrogenation of carbon black and a nanometre-sized iron catalyst at atmospheric pressure and a temperature of 1100 °C. The product is analysed by x-ray diffractio…
Molecular dynamics simulations are performed to study the lithium jumps in ${\mathrm{LiPO}}_{3}$ glass. In particular, we calculate higher-order correlation functions that probe the positions of single lithium ions at several times. Three-time correlation functions show that the nonexponential relaxation of the lithiu…
After a decade of intensive materials discovery and optimization, no single transparent conducting oxide has exceeded the intrinsic electrical performance limits suggested in 1992. High mobility oxide (HMO) structures are proposed as an alternative design that can surpass single material performance. Based on oxides w…
Abstract Polypropylene (PP)/Ti‐MCM‐41 nanocomposites were prepared by isospecific propylene polymerization with Ti‐MCM‐41/Al( i ‐C 4 H 9 ) 3 catalyst. The cross polarization/magic angle spinning (CP/MAS) 13 C NMR spectrum of the composite was similar to that of the conventional isotactic PP, and the decrease in the po…
Inverter supply is known to create additional power losses in an induction machine over those occurring with grid supply. The extent and nature of that increase are examined here for a switching frequency representative of current practice. Data are obtained from a time-stepped finite element analysis (FEA) model of t…
Electrostatic levitation together with multibeam heating and ultraviolet imaging overcame contamination, imaging, and sample position stability problems associated with handling of liquid tantalum and rhenium. Here, the density [ρ(T)] of these metals is reported in the superheated and undercooled states. Over the 2760…
Samples of Co0.1Ti0.9O2−δ (anatase) prepared by the sol–gel technique are found to be paramagnetic at room temperature, with the magnetic susceptibility following Curie–Weiss law in the investigated range of 2–370 K. However, transformation from paramagnetism to room-temperature ferromagnetism (RTFM) is observed by hy…
Effects of praseodymium modification on the crystal structure and polarization properties were investigated for layered ferroelectric SrBi2Ta2O9 (SBT). Neutron powder diffraction and x-ray photoelectron analyses showed that praseodymium ions are substituted at the Sr site as Pr3+ and that Sr vacancies are created for…
The microstructure and electrical properties of ultrathin BaTiO3 films (2–7 nm thick) have been studied. Multidomain structures having 180° domains and 90° domain boundaries were observed by high resolution transmission electron microscopy. The domains, which have a width as small as one unit cell, are mostly oriented…
A simple quantitative method for in situ control of the focused-electron-beam-induced deposition process is discussed and demonstrated with precursors used for Au, Cu, Rh, and SiO2 deposition. A picoamperemeter monitors the electron current flowing through the sample, which reproducibly drops at a characteristic rate…
Abstract The influence of electron beam irradiation on the properties of fluorine‐containing poly(aryl ether ketone)s (F‐PEK), derived from 2,3,4,5,6‐pentafluorobenzoic acid, was examined. Irradiation was performed with an electron beam at a dose of 3.63 × 10 3 Gy s −1 for which the corresponding doses were 29.0, 51.0…
Depending on the choice of thin film models and measurement data used for the characterization analysis one can obtain essentially different characterization results. It is especially difficult to reliably determine refractive index wavelength dependencies in the case of low accuracy measurement data. We consider poss…
The straightforward way to determine the half-life of a radioactive substance is to measure its activity in each of a series of time intervals, plot the data as a function of the accumulated time on semilog paper, and then measure the slope of the graph. A computer simulation of this procedure follows based on materia…
Several divinyl ether and diepoxide monomers bearing an azobenzene moiety were synthesized and used to investigate the photoalignment of a ferroelectric liquid crystal (FLC) with no use of surface orientation layers. Azobenzene polymer networks, obtained by cationic polymerization of the monomers dissolved in the FLC…
Abstract Crosslinked polyethylene foam is widely used in packaging and as an insulation material. Finely ground waste of such crosslinked foam mesh size 7 or particle size less than 2815 μm is used as a filler in high‐density polyethylene (HDPE) of two different grades (7.5 and 21 MFI). Mechanical, thermal, and morpho…
Abstract Novel heterogeneous cation‐exchange membranes using poly (ether sulfone)(PES) as binder and sulfonated poly(phenylene sulfide) (SPPS) powder as polyelectrolyte were prepared by the solution casting‐immersion method. Compared with a conventional route for heterogeneous membrane, the steps of milling resin into…
Abstract Acrylic polyols of different hydroxyl numbers consisting of hydroxy ethyl methacrylate, methyl methacrylate, butyl acrylate, and styrene were prepared by free‐radical solution as well as suspension polymerization techniques in the presence of benzoyl peroxide initiator. These polyols were crosslinked with but…