Materials Literature
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This paper presents an overview of the statistical properties arising from the broadness of the distribution of tunnel currents in metal-insulator-metal tunnel junctions. Experimental current inhomogeneities can be modelled by a lognormal distribution and the size dependence of the tunnel current is modified at small…
Applying the decoration-iteration procedure, we introduce a class of exactly solvable doubly decorated planar models consisting both of the Ising- and Heisenberg-type atoms. Exact solutions for the ground state, phase diagrams and basic physical quantities are derived and discussed. The detailed analysis of the releva…
The effects of magnetism on high pressure properties of transition metals and transition metal compounds can be quite important. In the case of Fe, magnetism is responsible for stability of the body-centered cubic (bcc) phase at ambient conditions, and the large thermal expansivity in face-centered cubic (fcc) iron, a…
Among various kinds of micro-optical elements, diffractive optical elements are especially attractive because of their functional flexibility in handling wave-front conversion, and because of their planar, compact and lightweight nature what makes them suitable for using in wide range of research, industrial and comme…
At room temperature, monoclinic BiPb2VO6 is a polar, noncentrosymmetric, second harmonic generation active material and its crystal structure is among the more complex to be solved ab initio from powder diffraction data. In its stability range, BiPb2VO6 also exists in a high symmetry, orthorhombic form. Both phases ha…
Poly(vinyl chloride) (PVC) samples for the conformation and structural relaxation studies were prepared by freeze-extracting the solutions in various solvents and with varying concentrations. The partially disentangled PVC samples could be obtained by freeze-extracting very dilute PVC/tetrahydrofuran (THF) and PVC/dim…
Complexes of the composition W(O)(2)(Cl)(2)L(2) and W(O)(2)(R)(2)L(2) (R = Me, Et; L(2) = bidentate Lewis base ligand) have been prepared and are fully characterized (including an exemplary X-ray crystal structure of W(O)(2)(Cl)(2)(4,4'-di-tert-butyl-2,2'-bipyridine)). This latter compound crystallizes in the orthorho…
Abstract Isolation of a new artifact ( 1 ) from Calotropis procera is reported which, apparently, is formed from the precursor calotropagenin ( 4 ) when exposed to methanol during work‐up. In addition, two more known cardenolides ( 2 and 3 ) could be identified. The structure of 1 and its full 1 H and 13 C signal assi…
Current UV-curable polymer techniques for microelectromechanical system fabrication pose certain challenges due to the electrical and mechanical properties of the polymer. A novel UV-curable polymer uniformly bonded with functionalized nanotubes was synthesized via a modified three-step in situ polymerization. Purifie…
Abstract Polypropylene blends containing a dispersed phase of scrap rubber dusts obtained from sport shoes manufacture; midsole (M, vulcanized EVA foam) and outsole (O, vulcanized rubber blend of NR, SBR, and BR) were studied. The influence of various compatibilizers on the mechanical properties of these blends were i…
We report the structure determination on a single crystal of Ba 12 Co 11 O 33, which belongs to the family of 1-dimensional structures related to the 2H hexagonal perovskite. The structure can be derived from the hcp stacking of [Ba 8 Co 2 O 18 ] and [Ba 8 O 24 ] layers. Assuming a similitude in the building principle…
Shape memory alloy (SMA)-reinforced composite patches not only provide non-intrusive and flexible structural damage repair like normal polymer composite patches, but are also able to enhance the repair efficiency by applying active closure stress. The active closure stress is produced by shape recovery of pre-stretche…
The isothermal crystallization of a semicrystalline poly(ethylene oxide- b -ethylene/butylene) diblock copolymer (PEO- b -PB h ) in uniform lamellar films has been investigated by X-ray reflectivity, optical microscopy, and atomic force microscopy. Crystallization of the PEO block leads to an increase in the lamellar…
Abstract SSP, starting from very low molecular weight (MW) poly(ethylene terephthalate) (PET) precursors, is claimed to offer significant production cost advantages over conventional PET production. However, as the intrinsic viscosity (IV) of the PET precursor is reduced, there is a significant change in the crystalli…
Abstract Three different modes of rheological properties were measured on 11 and 13 wt % solutions of cellulose in N ‐methyl morpholine N ‐oxide (NMMO) monohydrate, in which concentration range lyocell fibers of much reduced fibrillation are preferably produced. The dynamic rheological responses revealed that the Cox–…
Abstract Well‐dispersed nickel nanoparticles in polystyrene were obtained by a sonochemical method. The properties of the as‐prepared nanocomposite materials were characterized by XRD, TEM, EDAX, TGA, DSC, and a vibrating sample magnetometer (VSM). The nickel particles were 5 nm in diameter and were very well disperse…
This paper is one of a series (see: Inorg. Chem. 1999, 38, 3609; J. Am. Chem. Soc. 2000, 122, 632; Inorg. Chem. 2002, 41, 2364) exploring simple approaches for the estimation of lattice energies of ionic materials, avoiding elaborate computation. Knowledge of lattice energy can lead, via thermochemical cycles, to the…
A unique supercritical fluid inclusion-phase technique has been developed to embed silicon nanowires, with size monodispersed diameters, within the pores of mesoporous silica hosts. These nanocomposite materials displayed quite intense room temperature ultraviolet and visible photoluminescence (PL), and the emission w…
Following our previous papers regarding Pd/C and Pd/SiO 2 catalysts, the determination of the Pd/CO average chemisorption stoichiometry from experimental data has been extended to the Pd/alumina system. To this purpose, the Pd crystallite size determined by the well-established line-broadening (LB) method, using X-ray…
We have achieved a significant breakthrough in the synthesis of polyelectrolyte brushes of controlled thickness and density, which has been demonstrated by the synthesis of triblock copolymer brushes composed of cationic, neutral, and anionic segments.