Materials Literature
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Stokesian dynamics computer simulations were performed on monolayers of equally sized spheres. The influence of repulsive and attractive forces on the rheological behavior and on the microstructure were studied. Under specific conditions shear thickening could be observed in the simulations, usually together with a ch…
Amorphous boron carbide (a-B1−xCx) is believed to have an icosahedron-based random network. In this paper, vibrational properties of a-B1−xCx films are studied by IR and Raman spectra, placing particular emphasis on the interpretation of the most prominent 1100-cm−1 band associated with the B–C bond. The 1100-cm−1 ban…
The Curie point ( T C ) of BaTiO 3 was earlier reported to be 120° C and has been recently believed to be 130° C. Some experiments have been performed here to reconfirm the T C . Firing conditions used for preparing BaTiO 3 were examined first with the use of pure BaCO 3 or Ba(NO 3 ) 2 and TiO 2 . The x -dependence of…
Abstract In this study, the viscoelastic behavior of a microcellular plastic was investigated with particular emphasis on the effect of cell size. A poly(ethylene terephthalate) resin containing a polyolefin nucleating agent (CPET) was selected as the test material. In order to investigate the effect of cell size, mic…
The atomic structure of the interphase boundary enclosing an α (hcp) precipitate formed from the β (bcc) matrix in a Ti-Cr alloy was examined. All the interfaces of an α lath exhibit continuity of atomic planes between the matrix and the precipitate and thus are considered to be coherent or semicoherent. Such observat…
Over the past several years, numerous relationships between fiber properties and yarn performance have been developed. The classical method for predicting yam performance is statistical analysis such as linear multiple regression. Neural networks are now a subject of interest in many fields and a tool for many areas o…
The kinetics and mechanism of reaction of glassy carbon with a pure silicon melt or a Si + Mo melt were investigated. The results showed that the growth of a continuous reaction‐formed SiC layer followed a fourth‐power rate law in the temperature range of 1430° to 1510°C. A model that could explain the fourth‐power ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilica-Supported Zirconia. 1. Characterization by Infrared Spectroscopy, Temperature-Programmed Desorption, and X-ray DiffractionZ. Dang, B. G. Anderson, Y. Amenomiya, and B. A. MorrowCite this: J. Phys. Chem. 1995, 99, 39, 14437–14443Publication Date (Print):September 1, 19…
Abstract Fifteen kinds of mullite/SiC samples with different microstructures were prepared in order to examine the effect of Sic volume% and Sic grain size on mullite morphology and mechanical properties. Special attention was paid to the effect of heat‐treatment on fracture stress. It is shown that these materials ha…
The determination of formation and migration energies of point and clustered defects in SiC is of critical importance to a proper understanding of atomic phenomena in a wide range of applications. We present here calculations of formation and migration energies of a number of point and clustered defect configurations.…
The characterization of solid solutions by conventional X-ray diffraction (XRD) is critically assessed using the example of Cu-Co alloys. In particular, the limits of this technique for investigating compositional inhomogeneities are discussed. Coherent Cu-Co multilayer films are taken as a model for a decomposed soli…
The effect of thermal expansion mismatch stress between silicon nitride and different grain boundary phases on the fracture toughness of silicon nitride was investigated. Different sintering aids in the Y‐Mg‐Si‐Al‐O‐N system produced silicon nitride specimens with very similar micro‐ structures but different grain bou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex composition distribution of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Naoko Yoshie, Hiroyuki Menju, Hidenori Sato, and Yoshio InoueCite this: Macromolecules 1995, 28, 19, 6516–6521Publication Date (Print):September 1, 1995Publication History Published online1 May 2…
This paper presents a survey of the factors governing the performance and operation of high temperature subsupersonic metal atom beam sources. After an initial statement of the requirements placed on such sources a section is presented which considers the factors determining atomic beam intensities and profiles. The s…
We have performed depolarized dynamic light scattering measurements on suspensions of colloidal spherical particles made of a fluorinated polymer. Electrostatic interactions are screened by adding salt, so that the particles behave as hard spheres. By suspending the particles in an index-matching solvent (18% urea in…
Hydrothermal synthesis has been used to synthesize nano‐sized manganese zinc ferrite powder. The results show that the pH value of the starting suspension has a decisive influence on the composition of the hydrothermally prepared manganese zinc ferrite powder. At a pH value of ∼8.5, stoichiometric amounts of manganese…
Abstract The solvent molecules included in the clathrates (δ‐form) of syndiotactic polystyrene (s‐PS) are removed by suitable extraction procedures. An emptied δ‐form is produced which is different from the known γ‐form obtained by heating. The structural changes induced by thermal treatments on emptied and filled cla…
We report the existence of a reversible pressure-induced first-order phase transition between the zinc-blende (B3) and the NiAs (B8) phase in the beryllium chalcogenides BeSe and BeTe at pressures of 56\ifmmode\pm\else\textpm\fi{}5 GPa and 35\ifmmode\pm\else\textpm\fi{}5 GPa, respectively. The NiAs phase remains stabl…
Recognition of antigens by immunocompetent cells involves interactions that are specific to the chemical sequence and conformation of the epitope (antigenic determinant). Adjuvants that are currently used to enhance immunity to antigens tend to either alter the antigen conformation through surface adsorption or shield…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolylactones. 35. Macrocyclic and Stereoselective Polymerization of .beta.-D,L-Butyrolactone with Cyclic Dibutyltin InitiatorsHans R. Kricheldorf and Soo-Ran LeeCite this: Macromolecules 1995, 28, 20, 6718–6725Publication Date (Print):September 1, 1995Publication History Pub…