Materials Literature
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Abstract A set of N‐rich salts, 3 – 9 , of the heavy lanthanoids (terbium, 3 ; dysprosium, 4 ; holmium 5 ; erbium, 6 ; thulium, 7 ; ytterbium, 8 ; lutetium, 9 ) based on the energetic 5,5′‐azobis[1 H ‐tetrazole] (H 2 ZT) was synthesized and characterized by elemental analysis, vibrational (IR and Raman ) spectroscopy,…
The effect of metal nanostructures prepared by nanosphere lithography on photoluminescence (PL) properties of silicon nanocrystals (Si-ncs) is studied. By placing Ag nanotriangles or Au nanovoids on SiO2 films containing Si-ncs, the PL intensity is enhanced. For the sample having Ag nanotriangles, the largest PL enhan…
The field-emission characteristics of carbon nanoclusters (graphenes, nanotubes, their compositions with microdiamonds) produced by the cold destruction of natural graphite are studied. The structure of a coating of carbon nanoclusters on a tungsten cathode is examined by field emission microscopy, transmission electr…
As an advanced internal insulating material, silicone rubber has been widely used in extra high voltage prefabricated cable accessories. However, few studies were focused on the influence of frequency on the electrical tree characteristics and the damage mechanism of such insulation is still unknown. In this paper, th…
The boracites with general formula M3B7O13X (M = divalent metal, X = Cl, Br, I), shortly denoted as M-X, are among the first known multiferroic materials. They exhibit a sequence of transitions from the high temperature paraelectric cubic phase to ferroelectric orthorhombic, monoclinic, trigonal phases, and finally to…
The article is a review of development of polyurethanes (PUR) technologies during past 60 years. The problems, now being historical, concerning the preparation of raw materials: diisocyanates and diols (Scheme A) and classical macromolecular polyurethane compounds such as elastomers or foams (Fig. 1, 6) were discussed…
Glasses from the system of undoped lithium diborate and WO 3 -doped were synthesized by the usual melting and annealing techniques. UV-visible absorption spectra of the prepared sample were measured before and after successive gamma irradiation. Undoped glass reveals strong UV absorption spectrum which is related to t…
PD (partial discharge) resistance is prominent in polymer nanocomposites, which is enhanced by nano- segmentation of matrices, tight coupling in interfaces, and pile-up of nano fillers on surfaces. Treeing resistance is determined by partial dielectric breakdown of solids to produce initial trees followed by widening…
Sodium potassium niobate (Na 1 − x K x NbO 3 ) pellet samples, with x = 0.28, 0.30, 0.32, 0.325 and 0.4, were prepared by solid state reaction method. In the XRD patterns a break in the peak shifting tendency was observed for the composition with x = 0.32. Dielectric constant, loss tangent and dielectric conductivity…
This study compared the electrical conductivities of transparent films containing carbon nanotubes with different wall numbers (single-wall nanotubes (SWNTs), thin-wall nanotubes (TWNTs), and multiwall nanotubes (MWNTs)). A layer-by-layer fabrication method was chosen to achieve fine control over film transparency. Th…
Abstract New transition metal chalcogenidogermanates [{Co(tepa)} 2 (μ‐Ge 2 S 6 )] ( 1 ) and [{M(tepa)} 2 (μ‐Ge 2 Se 6 )] (M = Mn ( 2 ), Fe ( 3 ); tepa = tetraethylenepentamine) were synthesized with GeO 2 , S(Se) and transition metal chloride as starting materials in tepa under solvothermal conditions. Complexes 1 – 3…
The quest to develop workable electromechanical mechanisms in the nanoscale has often been predicated on meeting the conditions of super-low damping. We show here that the use of periodic forces to drive sliding core/shell double-walled carbon nanotube architectures produces oscillating-displacement response character…
Titania nanotubes (TiO 2 -NTs) are a potential drug vehicle for use in nanomedicine. To this end, a preliminary study of the interaction of a model cell with TiO 2 -NTs has been carried out. TiO 2 -NTs were first conjugated with a fluorescent label, fluorescein isothiocyanate (FITC). FITC-conjugated titania nanotubes…
The electrocaloric response of a ferroelectric capacitor to a periodic electric field has been analyzed in terms of the nonstationary heat conduction equation. A linear physical model is considered for an electrocaloric element in which one end (x = 0) is thermally insulated and a constant temperature T 0 is maintaine…
Mixing of two incompatible waters in water injection projects is usually associated with mineral scale formation and deposition in porous media. Deposition process dramatically affects the performance of water injection scenarios by reduction of porosity and mainly permeability of the rock. In this study, a series of…
We investigated the magnetic and structural properties of the ferromagnetic pyroxene ${\text{NaCrGe}}_{2}{\text{O}}_{6}$ by superconducting quantum interference device magnetometry and powder neutron diffraction. This material is the only ferromagnetic member of the recently reported multiferroic pyroxene family $AM{\…
ABSTRACT With the U.S. fuel ethanol industry projected to grow during the next several years, supplies of distillers dried grains with solubles (DDGS) are anticipated to continue to grow as well. DDGS is used primarily as livestock feed. Much of the DDGS must be shipped, often over large distances, outside the Corn Be…
It is established that GaAs-based semiconductor heterostructures containing a single layer delta-doped with manganese, obtained by combining the methods of metalorganic chemical vapor deposition (MOCVD) in a hydride system and laser ablation of solid targets in a common technological cycle, possess ferromagnetic prope…
The narrower the width of the graphene, the higher the impact of the atomic edge structure on its electronic properties. Here, we have performed computer simulations for the mechanical tearing of graphene to form a graphene nanoribbon (GNR) and identified the atomic edge structures. The simulations clearly show that s…
Three ${\text{Fe}}^{3+}$ centers with tetragonal symmetry and with the defect axis parallel to the polarization direction were detected in ferroelectric ${\text{PbTiO}}_{3}$ crystals using electron paramagnetic resonance. All exhibit large zero-field splittings (ZFS). Two are assigned to ${\text{Fe}}^{3+}$-oxygen vaca…