Materials Literature
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We present a study of high-field transport in carbon nanofibers (CNFs) and breakdown phenomena due to current stress. In situ measurements with scanning transmission electron microscopy reveal that the failure mode of CNFs is strongly related to the morphology of graphite layers comprising CNFs. Comparison with carbon…
Translational diffusion of a small charged tracer sphere in isotropic and nematic suspensions of long and thin charged rods is investigated as a function of ionic strength and rod concentration. A theory for the diffusive properties of a small sphere is developed, where both (screened) hydrodynamic interactions and ch…
Several single-walled carbon nanotubes (SWCNTs) prepared by different methods have been used to investigate the material dependence on the optimal film performance of flexible transparent conducting films. The nanotubes were dispersed in water with sodium dodecyl sulfate by sonication. These SWCNT solutions were then…
We study the interplay of Klein tunneling ($=\text{interband}$ tunneling) between $n$-doped and $p$-doped regions in graphene and Andreev reflection ($=\text{electron}$-hole conversion) at a superconducting electrode. The tunneling conductance of an $n\text{\ensuremath{-}}p\text{\ensuremath{-}}n$ junction initially in…
Tantalate-columbate concentrate has been studied; namely, its chemical, phase, and granulometric compositions and radioactivity have been investigated. The thermodynamics of reactions of chlorination of the components of the concentrate have been calculated in the temperature range of 400–1273 K. A technique of labora…
This contribution deals with the short term and the long term behaviour of multilayer pipes subjected to internal hydrostatic pressure. A new methodology for prediction of long term behaviour of multilayer pipes under internal hydrostatic pressure taking into account the material differences and the composite pipe con…
Nanocrystalline Co substituted TiO2 (anatase) films were prepared by a simple low temperature electrochemical route from aqueous solution. The films are transparent and exhibit room-temperature ferromagnetism.
Thin films with a graded refraction index constituted from silicon and titanium oxides were deposited by plasma enhanced chemical vapor deposition using electron cyclotron resonance. A plasma of oxygen reacted with two precursors: the tetraethoxysilane (TEOS) and the titanium isopropoxide (TIPT). The automatic regulat…
The activity of massive metallic and deposited oxide catalysts in the decomposition of N 2 O, which can possibly be used as a propellant, was studied. The data obtained were used to identify the active components such as carriers and transition metal ions and the methods for the preparation of catalysts that can be us…
The magnetic susceptibility and electrophysical properties of chromium-containing Bi5Nb3−3x · Cr3x O15−δ solid solutions with the perovskite-like structure were studied. Parameters of exchange interactions in the dimeric clusters of chromium atoms and also the distribution of chromium monomers and dimers in the solid…
Abstract Hemimorphic crystals of four M 1+ -M 3+ -diarsenates (M 1+ = Li, Na; M 3+ = Al, Sc, Ga) were prepared by mild hydrothermal methods (T = 493 K) at very low pH values of ~1–1.5. The crystalst ructures of all compounds were determined using single-crystal X-ray diffraction data (Mo-Kα, CCD detector, 293 K) and w…
Ni and Co nanowire arrays are prepared by electroplating filling of self-assembled radial nanopores in cylindrical anodic alumina, and their magnetic behavior is compared with that of nanowire arrays with the same geometry parameters in a planar configuration. Diameter and length of radially oriented nanowires are 35n…
Poly(ethylene terephthalate)/grafted carbon black (PET/GCB) and poly(ethylene terephthalate)/carbon black (PET/CB) composites were prepared by melt blending. The nucleating effect of CB and GCB were investigated using differential scanning calorimetry (DSC) analysis. The morphologies of the spherulites in PET, PET/CB…
Abstract Due to the importance of the NO‐CO reaction in current catalytic converters, reduction of NO by CO on Pt group catalysts is important to study. Various reaction mechanisms have been proposed for the NO‐CO reaction on Pt(100), which shows bifurcations, kinetic oscillations and multiple steady states under ultr…
Imaging of soft matter, including polymeric and biological materials, has always been one of the big challenges in electron microscopy, due to the electrically insulating properties and radiation/vacuum-sensitive nature of such specimens. We briefly highlight recent advances that enable high-resolution characterizatio…
The primary drawback of thermoelectric coolers (TECs) for electronics cooling applications is their thermodynamic inefficiency due to material limitations. The present work considers a control strategy to improve the overall coefficient of performance in an engineering system instead of addressing material shortcoming…
The effects of the type and content of wooden filler on surface free energy (γS) and its components (polar γSP and dispersive (γSD ones) of polymer/wood composites (WPC), based on poly(vinyl chloride) or polypropylene, were investigated. It was found that the addition of wooden filler causes increase in γS and γSD val…
Pr1-xCaxMnO3(PCMO) films with the desired atomic composition were deposited at low temperature (480 degC) by metalorganic chemical vapor deposition (MOCVD) using in situ infrared spectroscopic monitoring. The electric-pulse-induced resistance switching was observed in PCMO-based devices with various kinds of metal ele…
The suitability of the primmorphs system as a good model for biotechnological applications led researchers on primmorphs to look for a medium to stimulate cell proliferation and therefore growth of aggregates. Recent efforts have focused on the use of Fe+3 and Si that, supplemented to cell culture medium, were found t…
A new method for the synthesis and film deposition of nonvolatile aromatic lanthanide(III) carboxylates by ligand exchange reaction between the starting volatile components in the gas phase was proposed. The complexes Ln(Bz)3 (Ln = La3+, Tb3+, Lu3+, HBz = benzoic acid) were synthesized by gas-phase ligand exchange rea…