Materials Literature
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We have synthesized nine novel porphyrin derivatives, 1-8 and 1-Cu, substituted with various steric hindrance groups and long flexible chains in order to investigate the relationship between the molecular type of porphyrin derivatives and the resulting mesophase. Type 4 disc-like (C 12 O) 16 -TTPH 2 (1) and (C 12 O) 1…
Contents: Fire and fire safety; Flame retardants markets; Major flame retardant applications; Course of a fire; Combustion process; Mode of action of flame retardants; Halogen-containing flame retardants; Phosphorus containing flame retardants; Nitrogen containing flame retardants; Inorganic flame retardants; The role…
Supercritical fluid extraction was used to extract and recover >90% of the surfactant template from the pores of as-synthesized pure siliceous MCM-41 and the MCM-41 after supercritical fluid extraction shows more uniform pore size distribution than the calcined MCM-41.
A new bulk matrix correction program for quantitative electron probe microanalysis based on a double Gaussian φ(ρz) approach is presented. The independent input parameters for this new model are α (decay rate in the right-hand Gaussian), surface ionization φ(0), peak position (ρzm) and integral of φ(ρz) (FI). The Gaus…
In contrast to metalloporphyrins with non-electroactive metal centres, the π-cation radicals of porphyrin free bases (H2OEP, H2TPP, H2CdiE) electrogenerated in strictly anhydrous solvents are not stable and give rise to a quantitative chemical reaction. Conjunction of electrochemical and spectroscopic data (UV/VIS, EP…
Z. Qi and P. G. Pickup, Chem. Commun., 1998, 2299 DOI: 10.1039/A805322G
This paper describes the development of /spl plusmn/250 kV DC XLPE cables. Through a series of material investigations and the evaluation of model cables using two kinds of XLPE compound containing inorganic filler to suppress the accumulation of space charge within XLPE insulation, /spl plusmn/250 kV DC XLPE cables a…
Introduction to Physics of Warheads Against Ballistic Missiles - Fragmentation Warhead Principles - Premade Fragment Warheads - Kinetic Energy Rod Warheads - Direct Energy Warheads - Blast Warhead Concepts - Direct Hit Modeling with Missile Debris Considerations - Terminal Encounter Kinematics - Target Detection Mecha…
Time‐resolved reflectivity (TRR) measurements have been used to determine the growth kinetics of both the amorphous‐to‐γ‐phase and the γ‐to‐α phase transformations of alumina films that have been deposited on (0001), (1210), and (0112) sapphire substrates. The activation energies for the amorphous‐to‐γ‐phase and γ‐to‐…
2‘,6‘,3‘‘‘,5‘‘‘-Tetraphenyl- or tetra(4-biphenylyl)-4,4‘‘‘‘-diamino- p -quinquephenyls were synthesized from the corresponding pyrylium salts. Using them as starting materials, rigid-rod polyamides and polyimides containing phenyl or 4-biphenylyl side groups on the p -quinquephenyl segments of the backbone were prepar…
Preferential diffusion of deuterated solvents into the amorphous regions of a semicrystalline polymer enhances the contrast between the crystalline and amorphous regions measurable by small-angle neutron scattering. This scattering in nylons from the diffusion of D 2 O and deuterated ethylene glycol (d-EG) is analyzed…
The magnetic properties of the LaCo 13- x Al x and LaFe 13- x Al x compounds have been calculated, and the valence electronic structures of these compounds have been analyzed using empirical electron theory. In general, the calculated results agree with those of the experiments. Analysis of the electronic structures r…
The X-ray crystal structure refinements of two synthetic calcite single crystals containing 3.1 and 5.7 mol% magnesium were carried out. The structure of the second crystal was also refined at –80 °C. No significant structural difference from biogenic magnesium calcite was found. Magnesium within the crystals of calci…
The oxygen index (OI) of poly(butylene terephthalate) (PBT) tends to decrease when it is combined with milled-glass fibres either with or without the sizing treatment. This shows that the previously found apparent increase of flammability of PBT glass fibre composites (GFPBT) as compared to PBT is not due to the intro…
With the aim of increasing the number of structurally characterized dimetallic (CuII, LnIII) complexes, we have obtained a strictly dinuclear (CuII, GdIII) complex 1 in which, according to structural data, the two metal ions are triply bridged. Then, we have investigated the capability of Cusalen precursors for comple…
Synthetic methods have been developed which yield large single crystals and highly crystalline phase-pure microporous layered SnS-n materials. This allows study of the structure–property–function relations of these materials. The tin sulfide layer of the SnS-1 structure type contains hexagonally shaped 24-atom rings w…
Photocatalytic activities of Ga2−xInxO3 solid solutions consisting of β-Ga2O3 with a wide band gap and In2O3 with a medium band gap were studied in order to develop new photocatalysts based on oxide solid solutions. The Ga2−xInxO3 solid solutions were characterized by X-ray diffraction, surface area, diffuse reflectio…
We have investigated electrical conduction phenomena during high-electric-field poling of a standard covalently functionalized DR-1 side-chain polymer. We performed electric current and second-harmonic measurements simultaneously to derive the effective internal field strength. Various metals and transparent indium ti…
Starburst dendrimers are novel nanoscopic synthetic polymers of defined molecular mass and geometry. These macromolecules, available in commercial quantities, contain methyl carboxylate and primary amino-terminal groups. The presence of these groups on any macromolecule limits its usefulness especially in cases where,…
Diffraction gratings with feature sizes comparable to the wavelength are analyzed with a finite-difference time-domain method, which is a unique approach to electromagnetic problems in the time domain. The diffraction efficiencies obtained are in good agreement with other commonly used numerical methods in the frequen…