Materials Literature
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We have examined the effects of 20 keV electron irradiation on [-Cu(1)-O(1)-]n chain oxygen arrangements in oxygen deficient but otherwise twin-free YBa2Cu3O6+x single crystals. Comparison of polarized Raman spectra of non-irradiated and irradiated areas provides evidence that electron bombardments instigate the colle…
We present calculations of magnetic exchange interactions and critical temperature ${T}_{c}$ in ${\mathrm{G}\mathrm{a}}_{1\ensuremath{-}x}{\mathrm{M}\mathrm{n}}_{x}\mathrm{A}\mathrm{s}$, ${\mathrm{G}\mathrm{a}}_{1\ensuremath{-}x}{\mathrm{C}\mathrm{r}}_{x}\mathrm{A}\mathrm{s}$, and ${\mathrm{G}\mathrm{a}}_{1\ensuremath…
A multidomain two-dimensional periodically poled ferroelectric plate vibrator is reported for the first time. The theoretical calculations, computer simulations by the Finite Element Method and experimental data from the lithium tantalite samples reveal a domain acousto-electric resonance. A polarization inversion in…
GaN-nanorods grown on Si(111) substrates are found strain- and defect-free as characterized by micro Raman spectroscopy, secondary electron (SE) and cathode-luminescence (CL) imaging. The matrix supporting the nanorods bears the brunt of all strains, strain-relaxations, and defect generations, giving the nanorods an i…
Supramolecular chiral insulated molecular wire was constructed by self-assembly of a neutral one-dimensional schizophyllan host and a water-soluble polythiophene guest. The work presented here will not only open a door to a new application of polysaccharides but also provide an important clue to prepare stable supramo…
When two liquid drops come into contact, they coalesce rapidly, owing to the large curvature and unbalanced surface-tension forces in the neck region. We use an ultra-high-speed video camera to study the coalescence of a pendent and a sessile drop, over a range of drop sizes and liquid viscosities. For low viscosity,…
The magnetic modification of carbon nanotubes is described here. Pyrene can be noncovalently attached on the carbon nanotube surface. A carboxylic derivative of pyrene is used as interlinker for the binding of capped magnetic nanoparticles on the carbon nanotubes. The increased organophilic character of the capped nan…
We report that dendrimer-encapsulated Pd nanoparticles having a diameter of approximately 1.7 nm are effective and general catalysts for coupling aryl halides to organostannanes (the Stille reaction) under mild conditions. The significant results of this study are that the Stille reaction is catalyzed by dendrimer-enc…
The nonlinear response of infinite periodic solids to homogenous electric fields and collective atomic displacements is discussed in the framework of density functional perturbation theory. The approach is based on the $2n+1$ theorem applied to an electric-field-dependent energy functional. We report the expressions f…
Irreversible effects in thermoelectric materials limit their efficiency and economy for applications in power generation and refrigeration. While electron transport is unavoidably irreversible in bulk materials, here we derive conditions under which reversible diffusive electron transport can be achieved in nanostruct…
Ammonolysis of aliphatic and aromatic polycarbonates in liquid or in supercritical ammonia has been studied. Reaction products are alcohols (phenols) and urea. Ammonolysis of bisphenol A polycarbonate (BPA-PC) proceeds at room temperature at a high rate depending on the size and surface of particles. BPA-PC in composi…
Abstract We have investigated the defect structures and potential of mean force (PMF) of three colloidal spheres immersed in a nematic liquid crystal (for linear and equilateral‐triangular configurations), using a coarse‐grained theory for the tensor order parameter. At large separations, each sphere is surrounded by…
Sn-Beta is a successful Baeyer-Villiger oxidation catalyst for hydrogen peroxide, with a regular pore system with a 0.6 to 0.7 nm diameter. Diffusion of sterically more demanding substrates may be impeded, and therefore the mesoporous molecular sieve Sn-MCM-41 (channel diameter of 3.5 nm) is reported here as an altern…
The objective of this work is to assess patient doses for the most frequent X-ray examinations for the first time in Serbia and Montenegro. A total of 510 procedures for 11 different examination categories in 3 general hospitals were analysed. Mean and median entrance surface air kerma (ESAK) and kerma area product (K…
The ternary germanide Tb4FeGe8 was obtained from Ga flux reactions. The crystal structure studied with single-crystal X-ray diffraction revealed the existence of an orthorhombic average substructure (Cmcm, Z=1) with cell parameters a = 4.1118(14) A, b=15.844(5) A, and c=3.9885(15) A. The refinement [I > 2sigma(I)] con…
Two very different processes are used for the production of bisphenol A polycarbonate, melt transesterification and interfacial phosgenation. Each process has its own advantages and disadvantages, but both are commercially feasible. Although both processes form the same polycarbonate backbone, several important differ…
Polycarbonates ( 1 ) are an interesting and commercially successful class of polymers. Known for useful properties such as high heat capability, optical clarity, and incredible toughness, polycarbonates continue to generate academic interest as well as finding new avenues for commercial utilization. Although aromatic…
Abstract ‘Palladium‐polysiloxane’ nanocomposites were synthesized as stable and isolable powder by reduction of Pd(OAc) 2 with polymethylhydrosiloxane, which functions as a reducing agent and as a capping agent for the generation and stabilization of ‘palladium’‐nanoclusters. Redispersion of ‘palladium‐polysiloxane’ n…
Abstract Polypropylene (PP) has wide acceptance for use in many application areas. However, low thermal resistance complicates its general practice. The new approach in thermal stabilization of PP is based on the synthesis of PP nanocomposites. This paper discusses new advances in the study of the thermo‐oxidative deg…
Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system ${20{\mathrm{La}}_{2}{\mathrm{O}}_{3}\ensuremath{-}22{\mathrm{Al}}_{2}{\mathrm{O}}_{3}\ensuremath{-}23{\mathrm{B}}_{2}{\mathrm{O}}_{3}\ensuremath{-}35({\mathrm{SiO}}_{2}+{\mathrm{GeO}}_{2})}$ with…