Materials Literature
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A structural phase transition is shown around 400 K for the thermoelectric lamellar misfit cobalt oxide [Ca2CoO3][CoO2]1.62. This transition is related to a rearrangement of the central [CoO] layer of the [Ca2CoO3] slab of this structure, characterized by a commensurate intrinsic modulation q2 = 2/3a*-1/3c*. The parti…
The absolute average molar masses and polydispersity index of a series of polyesters based on 2,2-bis(hydroxymethyl)propanoic acid (BMPA, AB 2 -type monomer), 2,2-bis(hydroxymethyl)-1,3-propanediol (PE, B 4 -type monomer), and 1,1,1-tris(hydroxymethyl)propane (TMP, B 3 -type monomer) were determined by SEC/MALDI−TOF o…
The use of the superspace formalism is extended to the description and refinement of the homologous series of modular structures with two symmetry-related modules with different orientations. The lillianite homologous series has been taken as a study case. Starting from a commensurate modulated composite description w…
The evolution of silicon carbide (0001) surface reconstruction upon annealing has been studied by $\text{Si}\text{ }K$-edge near-edge x-ray-absorption fine structure (NEXAFS). With the increase in annealing temperature, the fluorescence yield of $\text{Si}\text{ }K$-edge NEXAFS clearly indicates an increase in disorde…
Abstract Single crystal of 2 mol% glycine doped Bis Thiourea Cadmium Chloride, a semi organic nonlinear optical material has been grown by slow evaporation technique. Good quality single crystal with dimension 14 × 12 × 5 mm 3 was harvested after 35 days. The influence of amino acid glycine was studied for 1, 2 and 3…
The mesophase behaviour of a polymer tethered nanorod is assessed by means of statistical mechanical theory and molecular dynamics simulation. A model system is considered in which a colloidal nanorod is tethered to a flexible polymer chain, which is able to form an “ideal” polymer coil in solution. As chain length in…
We measured element-specific Fe-phonon densities of states (Fe-PDOSs) of ${\text{LaFeAsO}}_{1\ensuremath{-}x}{\text{F}}_{x}$ $(x=0,0.11)$ and ${\text{La}}_{1\ensuremath{-}x}{\text{Ca}}_{x}\text{FePO}$ $(x=0.13)$ by nuclear resonant inelastic scattering of synchrotron radiation. Since the bands crossing the Fermi edge…
The energetics of even and odd linear C(n) carbon chain clusters are investigated by hybrid density functional theory (DFT) calculations. These molecular species are especially interesting due to their recent observation inside carbon nanotubes by polarized resonant Raman spectroscopy and high-resolution transmission…
Abstract The miscibility and structure in polypropylene/layered silicate nanocomposites is systematically investigated utilizing a maleic‐anhydride grafted polypropylene with a low degree of functionalization acting as the compatibilizer. The morphology of the hybrids can be modified from phase separated to almost com…
Synthesis and characterization of dendrimers containing thienylbenzene repeating units, red-emitting benzothiadiazole core, and triarylamine peripheries that bear naphthyl units are reported. The relevant dendrimers of different generations are classified as G(nb) (n=1-3), while the tert-butyl dendrimers G(na) with th…
We present a new approach for the preparation of single walled carbon nanotube silica composite materials that retain the intrinsic fluorescence characteristics of the encapsulated nanotubes. Incorporation of isolated nanotubes into optically transparent matrices, such as sol-gel prepared silica, to take advantage of…
An experimental and theoretical study of the oxidation of acetylene−ethanol mixtures in the absence and presence of NO has been carried out. The experiments were conducted in an isothermal quartz flow reactor at atmospheric pressure in the 775−1375 K temperature range. The influence of the temperature, stoichiometry (…
Temperature-induced destabilization of the dispersed phase in butter and margarine was compared by following changes in droplet size (d(3,3)), solid fat content (SFC), and fat crystal spatial organization in the 28-34 degrees C range. At 28 degrees C, both butter and margarine were stable, with similar d(3,3) values (…
Transformation optics is extended to the design of two-dimensional (2D) cloaks with non-conformal inner and outer boundaries. General and explicit expressions of the transformed medium parameters are derived, which are of the utmost importance in a cloak design procedure. A 2D cloak with irregular and non-conformal bo…
We have successfully observed subgrains of 1 µm average size in large grains (1 to 10 µm) in high-performance barium titanate (BaTiO 3 ) piezoelectric ceramics manufactured by two-step sintering. The BaTiO 3 ceramics fabricated from hydrothermally synthesized BaTiO 3 with an average particle size of 0.1 µm had a densi…
Abstract Potassium Acetate (CH 3 COOK) and Potassium Citrate (K 3 C 6 H 5 O 7 ) as new additives were added into the potassium dihydrogen phosphate (KDP) solutions in different molar ratios. The metastable zone width and induction period with and without these additives were determined and compared. Dielectric measure…
The results of atmospheric corrosion tests on a series of metals and alloys in marine and industrial atmospheres of the Earth’s regions with cold and very cold climate (Antarctic, sub-Arctic, Russian Far East) are considered. The class of most dangerous corrosive damage includes special types such as pitting, exfoliat…
Abstract ZnO:N thin films have been deposited on oxygen and zinc terminated polar surfaces of ZnO. The nitrogen incorporation in the epilayers, using NH 3 as doping source, was investigated as a function of the growth temperature in the range between 380 °C and 580 °C. We used Raman spectroscopy and low temperature ph…
We report lattice dynamics calculations of negative thermal-expansion (NTE) behavior of ${\text{ZrV}}_{2}{\text{O}}_{7}$ family, extending our previous work on the ${\text{ZrW}}_{2}{\text{O}}_{8}$ family. The two families of compounds differ in terms of the oxygen coordination around the V/W atoms leading to differenc…
This paper aims at modeling bi-periodic micro-structured silicon surfaces exhibiting broadband antireflection properties in the infrared range using Rigorous Coupled-Wave Analysis (RCWA). These structures of pyramidal shape, which typical dimensions are smaller than the wavelength, are not in the Effective Medium Theo…