Materials Literature
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Process of vapor pyrolytic deposition of carbon on nickel and cobalt-containing ordered mesoporous MCM-41 matrices at decomposition of acetylene have been investigated. Formation of nanotubes, nanowires and amorphous carbon particles depending pyrolysis conditions is observed.
For almost 200 years scientists have been fascinated by the ornate cell walls of the diatoms. These structures are made of amorphous silica, exhibiting species-specific, mostly porous patterns in the nano- to micrometer range. Recently, from the diatom Cylindrotheca fusiformis unusual phosphoproteins (termed silaffins…
This comprehensive reference details the technical, chemical, and mechanical aspects of high-temperature refractory composite materials for step-by-step guidance on the selection of the most appropriate system for specific manufacturing processes. The book surveys a wide range of lining system geometries and material…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of Structural Factors in the Nonlinear Optical Properties of Phthalocyanines and Related CompoundsGema de la Torre, Purificación Vázquez, F. Agulló-López, and Tomás TorresView Author Information Departamento de Química Orgánica (C-I) and Departamento de Física de Materi…
Abstract Summary: Various poly( ε ‐caprolactone‐ block ‐1,4‐dioxan‐2‐one) (P(CL‐ block ‐PDX)) block copolymers were prepared according to the living/controlled ring‐opening polymerization (ROP) of 1,4‐dioxan‐2‐one (PDX) as initiated by in situ generated ω ‐aluminium alkoxides poly( ε ‐caprolactone) (PCL) chains in tol…
The conventional paradigm of charge order for ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ for $x=0.5$ has been challenged recently by a Zener polaron picture emerging from experiments and theoretical calculations. The effective low energy Hamiltonian for the magnetic degrees of freed…
An electrically tunable diffraction phase grating using ultraviolet (UV)-light-induced spatial dielectric modulation of a dual-frequency liquid crystal (DFLC) cell is demonstrated. A photomask with transparent and opaque stripes was used for fabricating the grating. In the UV-exposed stripes, the negative dielectric a…
A stable high-valent RuVII: In pH<12 aqueous solutions, ruthenium tends to convert into lower oxidation states due to the disproportionation-decomposition reaction (DDR) shown. For the first time the novel stabilization of RuVII (as >RuVIIO) was identified in a ruthenium oxide–Prussian blue (RuOx–PB) analogue in an a…
Unimolecular dissociation reactions of gas-phase partially solvated transition metal complex ions, diamminebis(2,2‘-bipyridine)ruthenium(II), [Ru(NH 3 ) 2 (bipy) 2 ] 2+, tetraammine(2,2‘-bipyridine)ruthenium(II), [Ru(NH 3 ) 4 bipy] 2+, and pentaammine(2-methylpyrazine)ruthenium(II), [Ru(NH 3 ) 5 MePyz] 3+, have been i…
Extensive application of 1D and 2D NMR methodology, combined with molecular modeling, allowed the complete 1H and 13C NMR assignments of eremophilanolides from Senecio toluccanus. Comparison of the experimental 1H, 1H coupling constant values with those generated employing a generalized Karplus-type relationship, usin…
Highly (111) oriented Bi2Ti2O7 thin films have been grown on Pt∕Ti∕SiO2∕Si and Al2O3 substrates by metalorganic decomposition method at 550°C. The structural properties of the films were examined by x-ray diffraction. The Bi2Ti2O7 films exhibit good insulating property and the leakage current density of the film on Pt…
We employ Minkowski functionals to analyze the kinetics of pattern formation under an applied external shear flow. The considered pattern formation model describes the dynamics of phase separating block copolymer systems. For our purpose, we have chosen two block copolymer systems (a melt and a solution) that exhibit…
The dielectric loss spectra of a series of copolyesters of poly(ethylene terephthalate) and poly(ethylene isophthalate) have been measured as a function of temperature in a broad frequency range (10(-1)-10(9) Hz). By these measurements, the merging of the two relevant relaxations alpha and beta has been studied. The b…
The effect of the silica support structure on the characteristics and catalytic properties in liquid-phase hydrogenation of 1-hexene over two types of silica (amorphous SiO 2 and MCM-41) supported Pd catalysts was studied under mild conditions. The catalysts were characterized by atomic adsorption (AA), N 2 physisorpt…
We report the heat capacity $({C}_{p})$ measurements on single crystals of pyrochlore ${\mathrm{Cd}}_{2}{\mathrm{Nb}}_{2}{\mathrm{O}}_{7}$ over the temperature range of $0.3\phantom{\rule{0.5em}{0ex}}\text{to}\phantom{\rule{0.5em}{0ex}}420\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A peak in ${C}_{p}$ appears at ${T}_{\ma…
Cahn's phenomenological theory of wetting of a solid substrate by a saturated vapor is generalized to the case where the substrate is charged and the wetting film contains counterions, with or without added salt. The electrostatic contribution to the grand potential associated with these ions is calculated within a no…
A conductometric gas-sensing platform with temperature control has been adopted to probe temperature-dependent phenomena in conducting polymers. This letter describes our recent observation of thermal effects on the intermolecular charge transfer efficiency of conducting polyaniline at both ends of the charge transfer…
The Y-Si-O-N quaternary crystals are an important part of structural ceramics. Their crystal structures are complex and not precisely determined. Little is known about their electronic structure and bonding which are indispensable for a fundamental understanding of structural ceramics. Within the equilibrium phase dia…
The behavior of adsorbed water on oxides is of fundamental interest in many areas. Despite considerable attention received recently, our understanding of water chemistry is still short of needs and expectations, particularly on the topic of the coadsorption of water and other species. In this study we carry out densit…
We demonstrate a nonvolatile, reversible change of infrared reflectance from the thin film of perovskite manganite (Pr1−xCaxMnO3) by applying electric pulse. The result provides a possibility to use the electric-pulse-induced phenomena of this compound in optical devices.