Materials Literature
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The synthesis of structurally well defined poly(ε-caprolactone) (PCL)–silica nanocomposites was performed following two synthetic routes:( 1) “graft from” anionic ring opening polymerization of CL initiated from the surface of silica nanoparticles that have been previously modified by grafting of hydroxyl groups, and…
We study the transmission properties of a nonlinear periodic structure containing alternating slabs of a nonlinear right-handed material and a linear left-handed material. We find that the transmission associated with the zero-averaged refractive-index gap exhibits a bistable characteristic that is relatively insensit…
The objective of this study was to evaluate the capacity of three clinically useful tissue sources: tricuspid valve leaflet (TVL), carotid artery (CA), and jugular vein (JV), to generate myofibroblasts for potential use in a tissue-engineered cardiac valve replacement. Tissue biopsies of clinically appropriate sizes o…
The Ti K-edge EXAFS for PbTiO 3 measured in the temperature range including the critical temperature (763 K) due to the phase transition from tetragonal to cubic phase is discussed from the local point of view. Three kinds of atomic pairs, shorter Ti-O(1), medium Ti-O(2) and longer Ti-O(3) were analyzed independently.…
Organic–inorganic materials in which the organic part is constituted of dendrimers possessing one phosphorus atom at each branching point are reviewed. These dendrimers are either inside the materials and contribute to their elaboration, or they are linked to the surface of inorganic materials by covalent or electrost…
Langmuir monolayers (LM) and Langmuir-Blodgett (LB) films of pure lipophilic meso-tetra(4-dodecylaminosulfophenyl)porphyrin (PC12) and mixed with the anionic surfactant sodium hexadecylsulfate (SHS) were studied. The molecular packing and structure of PC12 and PC12-4SHS with variable surface pressure were investigated…
The size of nanometric carbonaceous particles produced in various combustion systems is determined by means of time resolved fluorescence polarization anisotropy (TRFPA). We also compare the performances of two different experimental implementations of thetechnique, which are complementary in terms of cost, simplicity…
Carbon deposition at Ni/ yttria-stabilized zirconia (YSZ) anodes with and without modification (with loading of 4.6 wt % in the anode) was investigated in methane with 3% and 10% The electrochemical performance of the Ni/YSZ anode in methane with 3% deteriorated sharply under open-circuit voltage (OCV) conditions, and…
Aragonite was grown epitaxially under calcite-stable conditions by using carbonate free single-crystal substrates with a threefold axis oriented normal to the surface.
The electrochemical behavior of zinc metal in a strong alkaline ( KOH) solution in the presence of , dicarboxylic acid modified poly(ethylene glycol) (PEG) was studied. Electrochemical methods (linear polarizations and potentiodynamic and potentiostatic techniques), spectroscopic (Fourier transform IR), morphological…
compact spinning system was based on the conventional ring-spinning system. The vast majority of previous work deals with the properties of compact yarn in yarn form. In this study, we inspected fabric samples knitted from compact spun yarn in comparison with fabric samples knitted from classic ring-spun yarn. Knitted…
Abstract: We show, using ab initio total energy density functional theory, that the so-called Wigner defects, an interstitial carbon atom right beside a vacancy, which are present in irradiated graphite, can also exist in bundles of carbon nanotubes. Due to the geometrical structure of a nanotube, however, this defect…
Ferrite material properties may vary depending on the grade and manufacturer. Moreover, there are differences between batches and also the production process may change in time. The same material grade may have improved or reduced performance depending on the year of production. In loss critical applications it is goo…
Subject to a continuing debate, cryogenic treatments of alloy steels have been claimed to significantly increase wear resistance and toughness through the interplay of three effects: completing martensitic transformation, promoting uniform precipitation of fine carbides and imparting residual stresses. This study reex…
Highly oriented ZnO ordered pore arrays (films) were electrochemically deposited on substrate based on colloidal monolayer template. Such oriented porous film has a preferential orientation along c -axis and shows strong and steady ultraviolet photoluminescence at room temperature, accompanied by a much weaker visible…
The preparation and structural characterization of a novel Ti-O-Ti bonding complex constructed in the mono-lacunary alpha-Keggin polyoxometalate (POM), are described. The water-soluble, crystalline complex with a formula of K5H2[[{Ti(OH)(ox)}2(micro-O)](alpha-PW11O39)] x 13H2O 1 was prepared in 30.2% (0.60 g scale) yi…
Selective laser sintering is used to prepare components from a kind of blended powder of polyamide 12 (PA12) and organically modified rectorite (OREC). The effects of OREC on the sintering parameters and mechanical properties of the sintered specimens are investigated. The results show that the laser power needed for…
Sr3Fe2UO9 double perovskite has been prepared in polycrystalline form by a solid state reaction, in air. This material has been studied by X-ray diffraction (XRD), neutron powder diffraction (NPD) and magnetic measurements. At room temperature, the crystal structure is tetragonal, space group I4/m, with a = b = 5.6994…
A quasi-quantitative photo-induced low-spin (LS)-->high-spin (HS) conversion of FeII ions has been observed in the [Fe(TRIM)2]Cl2 complex by irradiating the sample with blue light (488 nm) at 10 K. The time dependence of the HS-->LS relaxation has been studied between 10 K and 44 K by means of magnetic susceptibility…
Directionally solidified B4C–TiB2–SiC composites were prepared by a floating zone method using B4C, TiB2 and SiC as starting materials. The B4C–TiB2–SiC system was ternary eutectic whose eutectic composition was 51.2B4C–8.1TiB2–40.7SiC (mol%). The ternary eutectic composite showed a lamellar microstructure where B4C(1…