Materials Literature
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We have discovered massive icosahedral multiply twinned particles of boron carbide among soot produced during the arc evaporation of carbon and boron in the presence of magnesium. The observation is striking because 5-fold symmetry in large micron size crystals is extremely rare. It is suggested that the icosahedral s…
Abstract High‐luminance triode‐structure field‐emission‐display (FED) panel using carbon nanotubes (CNTs) as emitters was first presented in 1999.[1,2] The demonstrated panel showed a good legibility and excellent luminance. After that, the emission stability in ambient gas was evaluated, and reported in 2000.[3] The…
The severity of four different soil environments toward the development of near-neutral pH stress corrosion cracking (SCC) of pipeline steel was evaluated using slow strain-rate testing (SSRT). These soils were collected from pipeline sites where near-neutral pH SCC has been observed. It was demonstrated in this inves…
Abstract Particulate process modeling is critical for system design and control used widely in the chemical industly. Previous methods have focused on the assumption of appropriate models that can capture system behavior. A new technique presented is based on viewing the population balance from an inverse problem pers…
SSV1 is a virus infecting the extremely thermophilic archaeon Sulfolobus shibatae. The viral-encoded integrase is responsible for site-specific integration of SSV1 into its host genome. The recombinant enzyme was expressed in Escherichia coli, purified to homogeneity, and its biochemical properties investigated in vit…
Films of pure high-quality multiwall carbon nanotubes are grown by laser-assisted thermal chemical vapor deposition in a cold wall reactor. A CO2 laser is used to locally heat a substrate on which nanotubes are grown, employing the catalytic activity of iron nanoparticles. Two kinds of experiments are reported: In a t…
Selective growth of singly oriented (110)-, (100)-, and (111)-MgO films on Si(100) substrates were obtained by pulsed laser deposition. The effects of deposition temperature, ambient oxygen pressure, and etching of the substrate on the structural properties of the films were studied. It is found that the crystalline o…
We correlate fine structure with the adsorption behavior of new (lyocell) and conventional (viscose, modal) regenerated cellulose fibers. We have studied the molecular structure, the fine structure and, most important of all, the amorphous regions and voids in the system. Differences in adsorption properties of all th…
Nanosized powders of single‐phase zinc gallate (ZnGa 2 O 4 ) spinel were hydrothermally synthesized from solutions in the presence of NaOH over the pH range of 1.9 to 7.0 and from solutions above pH 7.0, i.e., the very basic medium (pH of 13.85), by removing the residual ZnO phase by washing with aqueous H 2 SO 4 from…
Grain-boundary (GB) properties in a polycrystalline system are generally anisotropic; in particular, both the GB energy and the mobility depend on the GB misorientation. Here the effect of anisotropic GB properties on two- dimensional grain growth is investigated by computer simulation. A stochastic velocity Monte Car…
End-grafted polystyrene “brushes” of various thickness and grafting density on silica surfaces were synthesized by surface-initiated polymerization. The “brushes” were studied by contact angle measurements, ellipsometry, and scanning force microscopy (SFM). Wetting behavior of thin polystyrene film on the top of the g…
Seeding effects on the microstructure and mechanical properties of single‐phase Ca‐α‐SiAlON ceramics have been investigated. Whereas a small amount of seeds can transform the microstructure from one of fine equiaxed grains to one consisting of many needle‐like grains, the highest fracture toughness of 8 MPa·m 1/2 is n…
Author: Schmidt, S. et al.; Genre: Journal Article; Issued: 2002-05; Keywords: MPI für Metallforschung; Abt. Rühle; grain boundary segregation; liquid-metal embrittlement; analytical transmission electron microscopy; Al-Ga alloys; Title: Gallium segregation at grain boundaries in aluminium
Nanocrystalline MgAl2O4 powders were prepared by a thermal decomposition method, i.e. by use of molten salts. This method involves co-melting stoichiometric amounts of magnesium nitrate hydrate Mg(NO3)2.6H 2O and aluminium nitrate hydrate Al(N O3) 3.9H2O at 500°C. The spinel content of the co-melted and calcined powde…
Flexible large sheets of dimethylsiloxane‐based inorganic/organic hybrids with sizes of ∼200 mm × 290 mm and ∼1.5 mm thickness have been fabricated from poly(dimethylsiloxane) (PDMS) and metal alkoxides of Zr and Ta. The hybrid sheets were characterized by XPS, EXAFS, FT‐IR, HRTEM, and SAXS. The inorganic components d…
Synthesis of Mn2+-activated zinc silicate phosphor using the combustion method is described. An efficient phosphor can be prepared by this method at reaction temperatures as low as 500 °C in a few minutes. The phosphor so prepared is compared with those prepared by other methods such as sol–gel and CGUPS.
Abstract Experimental results for the gross heat of combustion of over 140 commercial and developmental polymers and small molecules of known chemical structure were used to derive additive molar group contributions to the heat of combustion. The materials examined contained carbon, hydrogen, oxygen, nitrogen, phospho…
Assuming a practical use in ITER facility, rapid recovery and supply of tritium to accommodate pulsed plasma operation cycle with minimal inventory was tested. For this purpose, tritium will be supplied from heated bed with vacuum pump while heat of reaction is supplied externally. For recovery, hydriding reaction occ…
In this study, the model presented in Part I is used to investigate phenomena related to the compression of fiber assemblies that are not accounted for by van Wyk's theory of the uniaxial compression of an initially random fiber assembly. In order to do this, the potential energy, the work done on the assembly, and a…
The dielectric permittivity and ac conductivity of bis-(Methyltriphenyl-phosphonium) 2 tetraiodomercurate (II), [(CH 3 )(C 6 H 5 ) 3 P] 2 HgI 4 , has been measured in at 300-400 K and 0.11-20 kHz. The frequency dependent conductivity is interpreted in terms of the jump relaxation model, where translational and reorien…