Materials Literature
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Understanding and controlling the chemical reactivity of carbon nanotubes (CNTs) is a fundamental requisite to prepare novel nanoscopic structures with practical uses in materials applications. Here, we present a comprehensive microscopic and spectroscopic characterization of carbon nanotubes which have been chemicall…
A blend mixture of biodegradable poly(epsilon-caprolactone) (PCL) and poly(d,l-lactic-co-glycolic acid)-poly(ethylene glycol)-NH(2) (PLGA-b-PEG-NH(2)) block copolymer was electrospun to produce surface functionalized nanofibers. The resulting nanofibrous mesh with primary amine groups on the surface was applied for im…
A series of CuO/Al(2)O(3)-ZrO(2) catalysts with Cu loadings varying from 1.0 to 20 wt % were prepared and characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), temperature-programmed desorption (TPD) of CO(2) and NH(3), electron spin resonance (ESR), and Brunauer-Emmett-Teller surface area…
The evolution of the magnetic moment and various features of the electronic structure of fcc Gd are followed to reduced volume V/Vo = 0.125 using the LDA+U correlated band method. The stability of the moment is substantial; crude estimates of this signature of a possible ``Mott transition'' in the 4f system suggest a…
In fcc metals, kink-pair formation in dislocation lines aligned along close-packed lattice directions can give rise to internal friction effects called Bordoni relaxation. The resulting internal friction peak is a superposition of several individual peaks, each with complex features. To study this behaviour, the diffe…
Abstract A series of novel ternary polyimide/SiO 2 /polydiphenylsiloxane (PI/SiO 2 /PDPhS) composite films were prepared through co‐hydrolysis and condensation between tetramethoxysilane, diphenyldimethoxysilane (DDS) and aminopropyltriethoxysilane‐terminated polyamic acid, using an in situ sol–gel method. The composi…
Abstract Six single phase La 1–x Ca x Cr 1–y Ti y–γ Ru γ O 3–δ (x = 0.1, 0.2, y = 1.0, 0.8 and γ = 0.0, 0.1, 0.2) compositions are prepared by solid state reaction. Oxygen non‐stoichiometry, electrical conductivity, catalytic activity, and electrochemical efficiency of these compositions is investigated over a wide te…
A simple method is described to prepare submicrometer α‐alumina by burning carbon supported on the surface of γ‐alumina in oxygen flow at a temperature of 800°C. The burning of carbon generates a large amount of heat and leads to a rapid increase in the local temperature inside the pores of alumina. When the temperatu…
A two‐dimensional axisymmetrical mathematical model for the isothermal chemical vapor infiltration process of C/SiC composites was developed. Transport phenomena of momentum, energy, and mass in conjunction with infiltration‐induced changes of preform structure were taken into account. The integrated model was impleme…
A method for determining the optical constants and the thickness of weakly absorbing thin films on substrates is proposed. In this method only the reflectance and transmittance spectra obtained at a single arbitrary angle of incidence are used, provided that the former reveals several interference extrema. The calcula…
In face-centred cubic (fcc) crystals, the stress–strain curves of 〈111〉 crystals are remarkably insensitive to dynamic recovery compared to other orientations. This effect is attested by several early experimental studies on copper, aluminium and silver crystals. The inhibition of dynamic recovery is attributed to a r…
The Korringa–Kohn–Rostoker method with the coherent potential approximation (KKR-CPA) was applied to calculate electronic structure and transport coefficients in disordered Ti 1− x Sc x NiSn, where semiconductor-to-metal crossovers have recently been observed in resistivity and thermopower experiments (Horyn et al 200…
Deformation modes are studied for two basal-plane slip systems, and , in ternary-layered Ti 2 AlC and Ti 2 AlN ceramics using the first-principles plane-wave pseudopotential total energy method. Based on the theoretical stress–strain curves, the slip system leads to smaller ideal shear strength compared to the mode, i…
We report a simple and convenient method for fabricating ordered porous structure in a polymeric thin film. A temporarily stabilized water-in-oil emulsion, where aqueous droplets were dispersed in the medium of polymer-organic solvent solution, was utilized for the preparation of porous structure. The water-in-oil emu…
The character of transformations of iron compounds caused by redox processes that occur on the surface and in the bulk of clay samples enriched in Fe 2 O 3 at various calcining stages was determined.
Abstract The present research focuses on a model system of a blend of two immiscible polymers containing an inorganic nanofiller, exploring the effect of various melt processing procedures on structuring and on the resulting properties. Binary polypropylene/alumina and ternary polypropylene/nylon/alumina composites we…
The equilibrium electrooptical effect in the isotropic phase of seven liquid crystalline substances (4- n -decyloxy-4′-cyanobiphenyl, carbosilane dendrimer of the fourth generation with cyanobiphenyl terminal fragments, and the fourth, fifth, sixth, seventh, and tenth members of the homologous series of 4- n -acylphen…
We describe the first dynamical simulations of domain growth during the self-assembly of the gyroid mesophase from a ternary amphiphilic mixture, using the lattice Boltzmann method. The gyroid is a chiral structure; we demonstrate that, for a symmetric amphiphile with no innate preference for left- or right-handed mor…
Surface and bulk electronic structures of Heusler-type (L21 type) Fe2VAl have been investigated by photoelectron spectroscopy, in particular, for the valence band and V 2p core level regions, in order to elucidate the changes in the valence band electronic structures for the surface and bulk regions. In the valence ba…
The dependence of the magnetization of Mn-implanted Si on the postimplant annealing temperature is studied. p-type Si wafers were implanted with 300keV Mn+ ions at 350°C to a fluence of 1×1016cm−2 and then annealed at 500–900°C for 5min. Ferromagnetic hysteresis loops were obtained at 10K using a superconducting quant…