Materials Literature
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Abstract Phthalocyaninatozinc(II) complexes bearing dendritic substituents have been prepared. It was found that their generation number and positions on the phthalocyanine ring caused unusual absorption and emission spectral features.
Nano-crystalline carbon films possessing a prevailing diamond or a graphite character, depending solely on substrate temperature and deposition time, can be deposited from a methane–hydrogen mixture by the direct current glow discharge plasma chemical vapor deposition method. In this study we investigate the evolution…
As part of a NASA program to develop materials for potential future space applications, poly(arylene ether)s containing phenylphosphine oxide groups were prepared and characterized. The polymers were synthesized by the aromatic nucleophilic displacement reaction of two isomeric bisphenols, 2,5- dihydroxyphenyldiphenyl…
A comparative analysis of the purification methods for single-walled carbon nanotubes (SWNTs) obtained by electric-arc-discharge synthesis is carried out. The purification methods include air oxidation of the initial material at various temperatures, treatment and/or oxidation in solutions of inorganic acids, microfil…
ABSTRACT The relationship between microstructure and nucleation of fatigue cracks in PH 13‐8 Mo stainless steel was explored with the use of atomic force microscopy (AFM) that allowed an accurate quantitative characterization of the surface features. Fully reversed strain‐ controlled fatigue tests were performed at 0.…
In recent papers we have used statistical mechanics to predict multiple phase formation in polymer liquid crystals (PLCs).[1, 2] Now we have performed molecular dynamics simulations of PLC copolymers as materials consisting of LC islands in flexible matrices. A method for creating such materials on a computer is descr…
The 364 nm photoelectron spectrum of Si2C3− is reported, together with high level ab initio calculations of the linear anion, and six linear and eight nonlinear structures of the neutral Si2C3. The adiabatic electron affinity of Si2C3, corresponding to the transition from the linear anion to the lowest electronic stat…
Dyeing of cellulose fibers with reactive disperse dyes is attempted using supercritical carbon dioxide (SC-CO 2 ) as a solvent at 393 K and 20 MPa. For pretreatment, cellulose fibers are treated with tetraethylene glycol dimethylether or N-methyl-2-pyrrolidinone. Results are compared with dyeing with other disperse dy…
Abstract The curve‐fitting of the complex C 1s envelopes (obtained under high‐energy‐resolution XPS conditions) resulting from the surface chemical modification of low‐density polyethylene has been investigated. The main problem is modelling of the dominant, asymmetric component due to unmodified hydrocarbon. Two appr…
Grain growth and semiconductivity of donor‐doped BaTiO 3 ceramics with an excess of BaO and additions of SiO 2 or B 2 O 3 were studied. The microstructures and electrical measurements on sintered samples revealed that their electrical properties are related to the microstructure development of the sintered samples. Sa…
This paper presents a totally analytical method to calculate the eddy current loss in a laminated rotor. First, the method derives the analytical field solutions both in the lamination and the air gap with average boundary conditions at the surface of the rotor. The magnetic field can then be determined from the stati…
Pb(Fe 1/2 Nb 1/2 )O 3 (PFN) has been successfully synthesized via a novel mechanical activation of mixed oxides and columbite precursor consisting of lead oxide and FeNbO 4 . A nanocrystalline perovskite phase 5–15 nm in crystallite size was formed after 30 h of mechanical activation at room temperature for both types…
A set of 45 acids or acid combinations was examined in the condensation of pyrrole + benzaldehyde (10 mM each in CH 2 Cl 2 ) leading to meso-tetraphenylporphyrin (TPP). Initial screening experiments identified suitable acid catalysts and the optimal concentration (in terms of TPP formation) for each acid. Subsequent e…
A shift of the corrosion potential in the positive direction (“ennoblement”) has been observed for cartridge brass and Al 2024 (UNS A92024) exposed to artificial seawater or Luria Bertani growth medium in the presence of bacteria such as B. subtilis, B. licheniformis, or E. coli. Since ennoblement was always accompani…
Aluminum nitride fibers were successfully synthesized from alumina fibers using an NH 3 –C 3 H 8 gas mixture as a reduction–nitridation agent. Observation using SEM clearly demonstrated that the morphology of the nitrided fibers was exactly the same as that of the raw alumina fibers, retaining the original regular sha…
The synthesis and characterization of phthalocyaninato-ruthenium ( PcRu ) complexes with potential functional axial ligands are described. The solubility of these PcRu complexes was much improved compared to their parent phthalocyanines without Ru , enabling purification by normal flash column chromatography and also…
Gravity-driven soap-film channels offer a convenient way to study two-dimensional hydrodynamics in the laboratory. With recently developed quantitative soap-film diagnostic techniques, velocity and thickness field information can be acquired to provide a complete description of the flow. We present a study of soap-fil…
This paper reviews the electron-irradiation effects in graphitic nanoparticles. Irradiation-induced atomic displacements cause structural defects in graphite lattice forming the basis of carbon nanoparticles such as nanotubes or carbon onions. Defects of the type of non-six-membered rings induce topological alteration…
In Denmark, straw is used for generating energy in power plants. However during straw combustion, potassium chloride and SO2 are released in the flue gas and through condensation and deposition processes they will result in the formation of superheater deposits rich in potassium chloride and potassium sulphate. These…
Chains of crystalline-Si nanospheres were studied by means of Raman scattering spectroscopy. We found that the one-phonon Raman scattering peak from the chains was asymmetric and broader than that from bulk Si. This phenomenon can be attributed to a phonon confinement in the silicon nanospheres. The phonon confinement…