Materials Literature
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Abstract This paper reviews the literature of polymer blends containing low and high molar mass liquid crystals. Low molar mass liquid crystals have been used as plasticizers for thermoplastic polymers and in applications such as electrooptics, optical recording media, and membranes. High molar mass liquid crystalline…
Si molecular-beam epitaxy (MBE) on smooth Si(100) surfaces is shown to occur at room temperature. We demonstrate for the first time that Si deposition becomes amorphous after growth of a limiting epitaxial thickness (${\mathit{h}}_{\mathrm{epi}}$). ${\mathit{h}}_{\mathrm{epi}}$ is \ensuremath{\approxeq}10--30 \AA{} at…
This article —included on a long time ICCET Investigation Program— studies the mechanical resistances variation, to flexure, of the 1 X 1 X 6 cm mortar samples (1:3) made with high initial resistance cement and with several slags addition (cement/slag = 85/15 - 65/35 - 40/60 and 30/70) with high furnace slag and a fly…
The lithotype mainly used in the construction of the Cathedral of Seville is the calcarenite from Puerto de Santa f\/laria followed by the limestone from Espera. The primordial extrinsecal factor of deterioration is the atmospherical contamination, mainly sulphur oxides and smoke, within a humid environment. From both…
This updating review describes, from the conceptual standpoint, all the research works so far carried out at the IDIEM by the group in charge of Probabilistic Strength of Materials as well as research activities under way at present. This description considers three aspects. First, the general purposes of the commente…
This paper has adopted a theoretical viewpoint for studying Fracture Statistics in round bars subjected to torsion, and for determining the cumulative probabilities of fracture using Weibull's specific-risk function for materials that exhibit volume and surface brittleness. The use of the defined-functions method has…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoisture permeability of edible films made with fatty acid and hydroxypropyl methyl celluloseRobert D. Hagenmaier and Philip E. ShawCite this: J. Agric. Food Chem. 1990, 38, 9, 1799–1803Publication Date (Print):September 1, 1990Publication History Published online1 May 2002P…
The results of the structural, optical, and electrical characterization of , , and films grown by the successive ionic layer adsorption and reaction process are presented. Polycrystalline cubic and hexagonal films grown on glass and on indium‐tin oxide covered glass have mean crystallite sizes and , and and , respecti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTγ-Isotactic polypropylene. A structure with nonparallel chain axesStefano V. Meille, S. Bruckner, and W. PorzioCite this: Macromolecules 1990, 23, 18, 4114–4121Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 Septemb…
The mechanism of cell damage by ultrasound in combination with hematoporphyrin was studied. Mouse sarcoma 180 cell suspensions were exposed to ultrasound for up to 60 s in the presence and absence of hematoporphyrin, with and without active oxygen scavengers. The cell damage enhancement by hematoporphyrin was suppress…
Accurate values for the hydrodynamic transport properties of random dispersions of hard spheres have been determined by numerical simulation. The many-body hydrodynamic interactions are calculated from a multipole-moment expansion of the force density on the surface of the solid particles; the singular lubrication for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrom semiconductor-semiconductor transition (42 K) to the highest-Tc organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Cl (Tc = 12.5 K)Jack M. Williams, Aravinda M. Kini, Hau H. Wang, K. Douglas Carlson, Urs Geiser, Lawrence K. Montgomery, Gloria J. Pyrka, Diana M. Watkins, Jef…
Superplastic structural ceramics (Y‐TZP, Al 2 O 3 , Si 3 N 4 , and their composites) that can withstand biaxial stretching to large strains have been developed recently. Microstructural design of these ceramics first requires an ultrafine grain size that is stable against coarsening during sintering and deformation. A…
Single crystals in the lead magnesium niobate-lead titanate-(1−x) Pb(Mg1/3 Nb2/3)O3-(x) PbTiO3 solid solution system were grown using a flux growth technique. Crystals over the compositional range of 0.3 ≤ ′ ≤ 0.4 being near the rhombohedra1 (pseudo-cubic)-tetragonal morphotropic phase boundary were characterized. The…
Spider major ampullate (dragline) silk is an extracellular fibrous protein with unique characteristics of strength and elasticity. The silk fiber has been proposed to consist of pseudocrystalline regions of antiparallel beta-sheet interspersed with elastic amorphous segments. The repetitive sequence of a fibroin prote…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new multiplet-cluster model for the morphology of random ionomersA. Eisenberg, B. Hird, and R. B. MooreCite this: Macromolecules 1990, 23, 18, 4098–4107Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September 199…
The photophysical characteristics and luminescence-spectroscopic properties of molecules with a high photostabilising efficiency are examined. It is shown theoretically that the short lifetime and (or) low population of the triplet state of the molecule are essential (but not sufficient) conditions for its use as a ph…
The isocitrate dehydrogenase of Escherichia coli is regulated by covalent modification at the active site rather than, as expected, at an allosteric site. As a means of evaluating the mechanism of regulation, the kinetics of the substrate, 2R,3S-isocitrate, and a substrate analog, 2R-malate, were compared for the nati…