Materials Literature
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The meso-octaethylporphyrinogen–sodium–lanthanide complexes, [{(η5 : η1 : η5 : η1-Et8N4)M}Na(thf)2], in the presence of Na metal and under a nitrogen atmosphere, fix and reduce dinitrogen to the [N2]2– anion, as shown by the isolation of the dinuclear complexes containing the [M(µ-η2 : η2-N2)M] moiety [M = Pr, Nd].
Recently, several diagnostic methods for measurement of permittivity and dielectric loss have been developed for non-destructive testing of water-tree degraded XLPE cables. Critical degradation is found to be associated with a more than proportional increase of the dielectric properties when increasing the applied tes…
Tubulin liganded with GTP at the N-site in the alpha-subunit and with GDP at the E-site in the beta-subunit (GDP-tubulin) reversibly binds one high affinity Mg2+ cation (Kb = 1.1 x 10(7) M-1), whereas tubulin liganded with GTP at both subunits (GTP-tubulin) binds one more high affinity Mg2+. The two cation binding loc…
Adaptation of the polymer matrix has allowed high enantioselectivity to be achieved for the first time with a polymer-supported chiral MnIII(salen) alkene epoxidation catalyst.
An intramolecular Zn–O2H3–Zn bridge as a complexed form of metal-bound hydroxide exhibits enhanced reactivity compared to the related Zn–OH–Zn unit, illustrated by the reaction with CO2.
Aluminosilicate MCM-41 materials prepared by post-synthesis alumination using aqueous aluminium chlorohydrate exhibit remarkably high mechanical and hydrothermal stability and in addition the materials, after steaming at high temperatures, possess stronger Brønsted acid sites compared to the parent material.
A synthetic route was developed for the preparation of trans-[Ru(NH3)4(NO)X]n+, where X = isonicotinamide (isn), pyrazine (pyz) or sulfite, and cis-[Ru(NH3)4(NO)(NO2)]2+. The complexes have been characterized by elemental analysis, UV/VIS, infrared, 1H NMR and ESR spectroscopies, molar conductance measurements and cyc…
We have begun studies of a novel type of biomaterial derived from a recently-discovered class of ionic self-complementary oligopeptides. These short peptides (typically 8, 16, 24, or 32 amino acid residues with internally-repeating sequences) self-assemble in aqueous salt solution into three-dimensional matrices capab…
We have found that liquid crystals can be aligned on a polyimide surface exposed to a low energy and neutral argon ion beam. The energy of the incident ions was varied between 75 eV and 500 eV, the integrated current density from 20 µA/cm 2 to 500 µA/cm 2 , and the angle of incidence over which alignment was measured…
The size and excitation dependence of resonant low-frequency Raman scattering in CdS nanocrystals (radii less than 10 nm) embedded in a glassy matrix have been investigated. We report a size-selective excitation for excitations inside the absorption features. The Raman spectra exhibit a different behavior when the exc…
Carbon nanotubes were produced in large amounts by catalytic decomposition of acetylene over a Co incorporated zeolite NaY support. Purification of multi-wall nanotubes was required in order to eliminate catalyst and amorphous carbon produced by thermal decomposition of hydrocarbon. First, separation of nanotubes and…
Ti-MCM-41 materials with methylated silicons have been prepared in one step synthesis; the resultant organic–inorganic composites are highly stable and present the highest activity and selectivity ever reported on Ti containing mesoporous catalysts for the epoxidation of olefins using organic peroxides.
A solvothermal reaction of metal oxalates such as PbC2O4 , Bi2(C2O4)3 with E (E=S, Se, Te) in organic solvents at relatively low temperature (120–160 °C) produces crystalline PbS, PbSe, PbTe, Bi2S3 , Bi2Se3 , and Bi2Te3 :PbC2O4+Esolvent
The layered hydrotalcite, Mg10Al2(OH)24CO3, acts as an efficient base catalyst for the epoxidation of various olefins using hydrogen peroxide in the presence of benzonitrile and with MeOH as solvent.
Abstract Thin (0.5–5‐ μm) palladium (Pd) membranes were prepared inside pores or on the suface of mesoporous (pore size 4–6 nm), sol – gel‐derived γ‐Al 2 O 3 supports by the chemical vapor deposition (CVD) method using palladium acetylacetonate and palladium chloride (together with hydrogen) as Pd precursors. When Pd…
Al2O3 fibers for strengthening of high-temperature composites have been grown by a simple method that uses cheap, readily available raw materials and relatively low temperatures. The fibers are characterized and the mechanism of growth discussed. The Figure shows a characteristic fiber ending drop, which indicates tha…
Different novel nanostructures of gold–polypyrrole composites are observed by the transmission electron microscopy, for the first time, with the advent of block copolymer micelles.
Catalyst (copper-coated zeolite catalyst, i.e., Cu-ZSM-5) was used to enhance NO/sub x/ removal plasma chemical reactions. Two kinds of hydrocarbons (2-propane-1-ol, 2-propanol) were added to the synthesized flue gas before the nonthermal plasma process, and their effects on NO/sub x/ removal characteristics were inve…
The first example of a mesostructured tin oxide that is stable to surfactant removal has been prepared by hydrolysis of tin isopropoxide in the presence of a neutral amine surfactant (tetradecylamine).
Numerous reports have been published in the literature which describe the crystallization of macromolecules by a variety of crystallization methods, including the vapour-diffusion and microbatch techniques. This topical review compares the results of examples of proteins which were crystallized by both vapour-diffusio…