Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesorption of Perylene from Combustion, NaCl, and Carbon ParticlesDietmar. Steiner and Heinz K. BurtscherCite this: Environ. Sci. Technol. 1994, 28, 7, 1254–1259Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994ht…
The thicknesses of thin oxide films grown on silicon in oxygen were measured by transmission electron microscopy (TEM), ellipsometry, and profilometry. For films thicker than about 30 nm the thicknesses measured with these three techniques were the same within experimental error; the ellipsometric thicknesses were cal…
The viscoelastic behavior of concentrated dispersions of adhesive hard spheres was investigated. By changing the temperature, the interaction potential of the particles was varied from a hard sphere repulsion to a strong attraction. Using torsion resonators and a nickel tube resonator the complex viscosity was measure…
A substantial amount of research on acoustic scattering by underwater bubbles is based on the theory of incoherent scattering. More recent work, devoted to much denser bubble assemblies, has instead used effective-media formulations that presuppose coherent effects. Here the mutual relationship between the two approac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Pressure Synthesis of Aliphatic Polyimides via Salt Monomers Composed of Aliphatic Diamines and Oxydiphthalic AcidKazuo Itoya, Yoshihiro Kumagai, Masa-aki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1994, 27, 15, 4101–4105Publication Date (Print):July 1, 1994Publ…
The effects of fiber volume fraction on composite mechaniacl properties were examined in SiC‐fiber‐reinforced Si 3 N 4 composites fabricated in our laboratories. Fiber volume fraction was found to have significant effects on important composite properties including failure mode, ultimate strength, matrix‐cracking stre…
Abstract Mesomorphic materials formed by hydrogen bonding between 4‐alkoxystillbazoles and some phenols are described.
Al 2 O 3 /AI composites have been formed by the directed oxidation of pure Al doped with MgO powder. Thermal gravimetric analysis was used to characterize reaction kinetics. Optical and scanning electron microscopy and SEM coupled with microanalysis were used to characterize the microstructure of product. Directed oxi…
The "multi-step" braiding process is introduced as an extension to the four-step braiding process. This process greatly enlarges the possibilities of braid micro-structures. An assumed yam packing arrangement within the braided preform and geometric considerations were used to relate yam orientation to non-dimensional…
Convergent-beam electron diffraction (CBED) was used to determine the space group of 9·9 and 18 mol.% Y2O3-stabilized cubic ZrO2 single crystals. The result (space group, 43m) is different from the known tetragonal structure (space group, P42/nmc) present in lower solute (3·2 mol.% Y2O3) alloys, and the cubic structur…
Optical and electro-optical characteristics of a silica suspension in a liquid crystal were studied. Their possible applications in different electro-optical devices are analyzed.
The irritant potency of 5 types of insulation wools (2 types of rockwool and 3 types of glasswool) were studied on the basis of their differences in diameter by a standardized rubbing test. Assessment was done by laser Doppler flowmetry (LDF) and erythema scores. Insulation wools show a wide distribution of the diamet…
The conventional nonlocal model, often used as a localization limiter for continuum‐based constitutive laws with strain‐softening, has been based on an isotropic averaging function. It has recently been shown that this type of nonlocal averaging leads to a model that cannot satisfactorily reproduce experimental result…
Composite materials made from Calcium modified Lead Titanate grains embedded in a copolymer matrix of poly(vinyledene fluoride trifluorethylene) have been produced in order to optimise their pyroelectric and piezoelectric properties. The resulting coefficients are dependent both on the electrical, mechanical and therm…
New ferroelectric phase transitions were found in ternary and quaternary solid solutions of IV-VI semiconductors. Their analysis shows that offcenter ions play important role in the appearance of ferroelectricity in these crystals.
A brominated phosphate was evaluated as a flame retardant in a polycarbonate and various polycarbonate blends. This flame retardant was found to be significantly more effective than an all-bromine and an all- phosphorus flame retardant, and bromine-phosphorus synergy was demon strated. The synergy is more pronounced w…
DMA spectra were taken from tensile loaded neat and glass-fiber mat- reinforced polypropylene (GMT-PP) with different reinforcement fractions ( V f ). Reliable data were achieved by using rectangular specimens of proper dimension, i.e., having a clamped surface of 60 x 15 mm 2 . It was established that the β- or T g -…
Abstract The microwave absorption and reflection characteristics of composites of polypyrrole with paper, cotton cloth and polyester fabrics have been evaluated. Refiectivity measurements in the range 2–18 GHz and plane wave modelling have revealed impedance charateristics with a common transition rgion. Relationships…
The outgassing rate from an electropolished stainless steel (type 304) surface is measured after the surface is exposed to H2O vapor at pressures (p0) of 10−3–10 Torr for exposure periods (t0) of 3–600 min. The system is kept at 310, 350, or 390 K during H2O exposures and subsequent outgassing measurements. Our data s…
The results of a study of the effects of constant uniaxial stress on the irreversible and reversible differential permeabilities of minor and saturation major hystersis loops are presented, extending an earlier study which studied those permeability components on the initial magnetization curve. Tension was found to i…