Materials Literature
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Two coarse-grained models for polymer chains in dense glass-forming polymer melts are studied by computer simulation: the bond fluctuation model on a simple cubic lattice is treated by Monte Carlo methods, and a continuum bead-spring model with a Lennard-Jones potential between the beads is treated by means of molecul…
Phosphorus-based flame retardants have diverse modes of action, Aryl phosphates can have vapor phase action in styrenic polymers but also can contribute to producing a barrier layer. Tris(dichloroisopropyl) phosphate in a flexible polyurethane foam can serve as both a vapor-phase (probably physical) flame inhibitor in…
Vascularization into a poly(vinyl alcohol) (PVA) sponge was investigated using basic fibroblast growth factor (bFGF). This growth factor was impregnated into biodegradable gelatin microspheres for its sustained release and then the bFGF-containing microspheres or free bFGF were incorporated into PVA sponges. Following…
The novel tetranuclear copper(II) complex [Cu4(hpda)4][ClO4]4·H2O (Hhpda = N-(2-hydroxyethyl)-1,3-propanediamine) with an open cubane-like Cu4O4 framework has been obtained and characterized by X-ray crystallography and magnetic measurements, exhibiting strongly ferromagnetic exchange interaction.
Push-pull thiazole-containing nonlinear optical chromophores with dicyanovinyl and tricyanovinyl acceptors, along with their thiophene analogs, have been synthesized and characterized. The onset temperatures of thermal decomposition of these chromophores determined by DSC are above 240 °C. The redox properties of the…
Silicon nitride with unidirectionally oriented elongated grains was fabricated by the combination of seeding and extrusion process. Development of such highly anisotropic microstructure is due to the high shear stress exerted during the extrusion process, which allowed the unidirectional alignment of rod-like seed par…
We apply first-principles density-functional calculations to study strain in dense amorphous tetrahedral carbon $(a\ensuremath{-}\mathrm{tC}).$ While the large strain present in small-ring structures, particularly three-member rings, could argue against their existence in $a\ensuremath{-}\mathrm{tC},$ we demonstrate,…
The amorphous-to-crystalline phase change induced by a continuous-wave laser was investigated systematically in the case of as-grown amorphous films of , and and results were compared. The photo-thermal process is found to be responsible for the phase change in all three compounds. The minimum threshold laser power re…
The size–shape distribution of voids, which includes cracks and pores, was determined using quantitative stereological analysis. The analysis was performed on a water‐stabilized plasma‐spray‐formed Al 2 O 3 –13 wt% TiO 2 . The individual voids were assumed to have an oblate spheroidal shape, which could simulate shape…
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Poly(3,4‐ethylenedioxythiophene)‐polystyrenesulfonate (PEDOT‐PSS), an electronically conductive electroactive polymer, has been blended with an ion conducting polymer, polyethylene oxide (PEO), to increase the ionic mobility in the material. A substantial increase in the current density is observed in the cyclic volta…
To get high level secretion of human lysozyme in Pichia pastoris, the following three signal sequences and one prepro sequence were evaluated: chicken lysozyme signal peptide, leucine-rich artificial signal peptide, Saccharomyces invertase signal peptide, and Saccharomyces prepro sequence of alpha factor (MF-alpha Pre…
The chemistry of binary and multinary silver oxides spans from subvalent species (with a mean oxidation number for Ag smaller than + 1) to compounds with Ag in high oxidation states as + 2 and + 3. We have investigated a range of silver oxides, including the binary compounds Ag2O, AgO, Ag3O4 and Ag2O3 as well as subva…
has been synthesized under high oxygen pressure from a precursor prepared by means of a sol-gel method. The material obtained is of single phase and has an orthorhombic crystal structure at room temperature. The magnetic, electrical and thermal properties have been measured over a wide temperature range. This compound…
A novel porphyrin-fused porphyrin is formed by an oligomerization reaction of a (porphyrinato)nickel complex with TeCl4; the isolated compound, [2]porphyracene, was characterized by spectroscopic methods and direct observation using scanning tunnelling microscopy; the excitation energy value of 13460 cm–1 (743 nm) is…
A new kind of mixed-valence binuclear µ-oxo complex of manganese having two aqua ligands has been synthesized and structurally characterized.
In recent years, due to improvements in calculation methods and increased computer power, it has become possible to perform first-principles investigations for 'simple' chemical reactions at surfaces. We have carried out such studies for the catalytic oxidation of CO at transition metal surfaces, in particular, at the…
To address the ferrimagnetic state of the ${\mathrm{Mn}}_{12}$ acetate matrix $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}{(\mathrm{C}\mathrm{H}}_{3}{\mathrm{C}\mathrm{O}\mathrm{O})}_{16}{(\mathrm{H}}_{2}{\mathrm{O})}_{4}]$ we have performed all-electron gradient-corrected density-functional calculations on $(\mathrm{MnO}{)}…
The synthesis of 4,4′-bis(dialkylaminostyryl)-6,6′-dimethyl-2,2′-bipyridine ligands is described; the corresponding tetrahedral bis(bipyridyl) copper(I) complexes have been prepared, and their second-order nonlinear optical properties determined by harmonic light scattering (HLS) at 1.34 µm; these new octupolar comple…
Cotton and polyester fabrics are treated with radio-frequency plasma (in air) at different power levels and time intervals, and moisture content and surface resistivity behavior are investigated. Plasma treatment lowers the moisture content of cotton and enhances that of polyester. The surface resistivity of plasma tr…