Materials Literature
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The spectral function of graphene with point substitutional defects is calculated for different impurity concentrations. It is demonstrated that features in the spectral function of graphene observed in ARPES experiments can be caused by the presence of a well-defined resonance state and are clearly pronounced at the…
Abstract A series of titanate pyrochlore Ln2Ti2O7 (Ln = Eu–Lu) was prepared by a polymerized complex method and evaluated as a photocatalyst for water splitting reaction. All the Ln2Ti2O7, except for Tb2Ti2O7, demonstrated evolution of H2 and O2 in a stoichiometric ratio from pure water under UV-light irradiation. The…
The main technologies for preparation and industrial production of carbon nanotubes and nanofibers are briefly outlined. The most widespread facilities for catalytic pyrolysis of hydrocarbons are described. Information on single-and multiwalled nanotube production capacities worldwide is given. Nanotube and nanofiber…
The surface acidity of raw and acid activated palygorskite clay was studied by acid-base potentiometric titration. The Gran plot method was applied for the hydroxide titration, and the total surface sites (Hs) and the average number of protons reacted per surface site (Z) of the palygorskite samples at a given ionic s…
The dependence of the structure of cadmium sulfide nanoparticles on their size has been established for nanopowders and thin films. Nanoparticles from 3 to 8 nm in size have a disordered close-packed structure, characterized by the absence of periodic sequence of packing planes. Particles more than 14 nm in size have…
The symmetry properties, order parameters, and magnetoelectric phase diagrams of multiferroics are discussed. After brief reviews of Ni3V2O8, TbMnO3, and RbFe(MoO4)2, we present a detailed analysis of RMn2O5 (with R = Y, Ho, Dy, Er, Tb, Tm).
Abstract Sub-micrometer clay particles are of interest in clay-polymer applications, especially when transparency is important. The scattering of light can be reduced by the adjustment of the refractive index (RI) of the clays to that of the matrix. In this study, the RI of sub-micrometer illite particles was changed…
Abstract The intercalation of camptothecin (CPT) into a layered inorganic host, Mg‐Al layered double hydroxide (LDH), was carried out using a coprecipitation method to obtain CPT‐LDH nanohybrids. It was found that the intercalated amounts ( A in ) of CPT‐LDH nanohybrids were remarkably dependent on the molar ratios (…
The synthesis and photophysical properties of six new abietic acid based amine end-capped p-phenylenevinylene trimers (AECPV3) in their lowest excited singlet states are presented. The AECPV3 compounds show a large red-shift of both the absorption (25-30 nm) and emission (37-42 nm) maxima with respect to those of the…
A plasma-assisted method was employed to prepare Ni/-Al2O3 catalyst for carbon dioxide reforming of methane reaction. The novel catalyst possessed higher activity and better coke-suppression performance than those of the conventional calcination catalyst. To achieve the same CH4 conversion, the conventional catalyst n…
Abstract We discuss crystal structure of amides and imides, which are focusing on promising hydrogen storage materials. They are ionic crystal with anion of (NH 2 ) – or (NH) 2– and cation of Li + , Na + , Mg 2+ , Ca 2+ , and so forth. We also discuss reaction mechanisms on hydrogen ab/desorption of amide/imide hydrog…
The following nanocrystalline binary oxide systems were studied: Mg-Ti, Ni-Ti, Zr-Al, as well as some pure and doped unary oxides. The xerogels were heated at a constant T (200 to 1600°C) for 3 to 6 hours. There was a threshold tempearture for oxide formation and in many cases the products were metastable nanocrystall…
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The structural properties of nitrogenated amorphous carbon deposited by radiofrequency magnetron sputtering of graphite in pure N2 plasma are investigated as a function of the substrate temperature and radiofrequency discharge power. The film composition is derived from x-ray photoemission spectroscopy, nuclear reacti…
This review describes a study of nonmagnetic-defect-induced magnetism of graphene on the basis of a tight-binding model. A vacancy induces around itself a quasilocalized impurity state at the chemical potential and leads to formation of local magnetic moments. The connection between a quasilocalized state around a vac…
Dispersion of nanoclay clusters during resin transfer molding of nanoclay/glass/epoxy disks is investigated. In addition to a center-gated disk containing only 14% glass fibers, three nanocomposite disks are fabricated with the addition of 2, 5 or 10 wt% Cloisite ® 25A nanoclay. The spatial distribution of nanoclay cl…
The effective elastic modulus and fracture toughness of the nanofilm were derived with the surface relaxation and the surface energy taken into consideration by means of the interatomic potential of an ideal crystal. The size effects of the effective elastic modulus and fracture toughness were discussed when the thick…
In terms of locating the source of partial discharge, transient earth voltage (TEV) detection is well recognised to have advantages over electrical methods. A variety of sensors are suitable for on-line PD testing of outdoor equipment, including ultra-high frequency (UHF) and radio frequency (RF) antenna, transient ea…
Comprehensive studies of the spectroluminescence and laser properties of high-concentration photothermorefractive nanoglass–ceramics doped with ytterbium and erbium ions for integrated-optics amplifiers and minilasers have been carried out for the first time. The limiting concentrations of erbium for which amplificati…
We report the optical property measurements on boron-doped diamond (BDD) films which were synthesized by microwave plasma-assisted chemical vapor deposition technique on Si (100) using methane in high hydrogen dilution and trimethylboron as precursors with varying boron concentration such that [B]∕[C]gas=100, 500, 100…