Materials Literature
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Liquid crystals containing “open” analogues of the mesomorphic amide 1,4,7‐triazacyclononane, i.e., 3,4‐bis(alkoxy)‐ benzoyl substituted diethylenetriamine, are reported, showing that the closed‐ring structure of the central core is not essential for mesomorphism in these compounds. The Figure shows the pronounced pse…
Various attempts have been made to develop models for predicting the development of damage in metals and alloys due to pitting corrosion. These models may be divided into two classes: the empirical approach which employs extreme value statistics, and the deterministic approach based on perceived mechanisms for nucleat…
Recent developments of the IMPAX system for automated crystallization are presented. A five-channel microtip has been introduced into the system thereby providing an extra degree of freedom for carrying out experiments. A new mouse-driven program for screening has been introduced, which creates a much wider scope for…
Analyzing the normal-state magnetic susceptibility \ensuremath{\chi} for ${\mathrm{TlSr}}_{2}$(${\mathrm{Lu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$)${\mathrm{Cu}}_{2}$${\mathrm{O}}_{\mathit{y}}$, whose carrier density covers the entire range from the underdoped to the overdoped regime, as a…
In recent work, Oswald and collaborators describe the thermodynamical phase diagrams of a large pitch cholesteric, confined between glass plates with homeotropic alignment conditions, in the neighbourhood of the critical confinement and in the presence of an AC electric field. In the case of a negative dielectric anis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Antimony(V) Octaethylporphyrins That Contain a .sigma.-Bonded Element-Carbon BondK. Akiba, Yoshitaka Onzuka, Makoto Itagaki, Hiroshi Hirota, and Yohsuke YamamotoCite this: Organometallics 1994, 13, 7, 2800–2803Publication Date (Print):July 1, 1994Publication His…
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…