Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpitaxial Thin Films of Large Organic Molecules: Characterization of Phthalocyanine and Coronene Overlayers on the Layered Semiconductors MoS2 and SnS2C. D. England, G. E. Collins, T. J. Schuerlein, and N. R. ArmstrongCite this: Langmuir 1994, 10, 8, 2748–2756Publication Dat…
Amorphous, optically isotropic films of photochromic liquid crystalline copolymers have been prepared and irradiated with linearly polarized light. In this way high values of dichroism and birefringence have been induced.
BACKGROUND: Intimal hyperplasia (IH), a cause of early graft failure, may be regulated by leukocyte-elaborated cytokines. We investigated leukocyte infiltration and cytokine gene expression in vein grafts. METHODS: Epigastric vein to femoral artery grafts were performed in Lewis rats and harvested on day 4 and weeks 1…
Carbon nitride thin films have been prepared by NH 3 -ion-beam-assisted deposition with bombardment energies of 200-800 eV at room temperature. These films have been characterized by transmission electron microscopy, Auger electron spectroscopy and x-ray photoelectron spectroscopy for chemical analysis. It was found t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole Localization or Delocalization? An Optical, Raman, and Redox Study of Lanthanide Porphyrin-Phthalocyanine Sandwich-Type HeterocomplexesThu-Hoa Tran-Thi, Tony A. Mattioli, Driss Chabach, Andre De Cian, and Raymond WeissCite this: J. Phys. Chem. 1994, 98, 34, 8279–8288Pub…
Abstract High molecular weight poly( o ‐methoxyaniline) was synthesized using a novel method in which the polymerization occurs in the presence of a neutral salt. The molecular weight of the polymer was greatly affected by the quenching procedure employed to conclude the polymerization. Conventional doping of the base…
Two polymorphs of oxyvanadium phthalocyanine(VOPc ),crystalline and amorohous were obtained and identified by X-ray powder diffraction,Both photoreceptors constructed by polymorphs incorporated with hydrazone compounds as CTL exhibited photoconductive properties in the infrared region.
1. Adenosine is an endogenous neuroprotective agent; stimulation of A1 receptors decreases excitatory amino acid neurotransmission and stimulation of A2 receptors inhibits platelet and neutrophil activation and promotes vasodilation.2. Post-ischemic administration of propentofylline (HWA 285) reduces neuronal damage i…
F. Mansfeld* discusses “Effectiveness of Ion Vapor-Deposited Aluminum as a Primer for Epoxy and Urethane Topcoats,” by J.F. McIntyre and L. Hang,** which was published in Corrosion 50, 1 (1994): pp. 26-38. A reply from McIntyre follows.
The pollen morphology of all 13 species of Periploca L. was studied. All the species are characterized by pollen grains arranged in tetrads. The arrangement of the grains may be rhomboidal, decussate or linear. Linear tetrads were only observed in P. acuminata Rahman & Wilcock, P. sepium Bunge and P. aphylla Decaisne.…
Abstract A spray dryer simulation program is described. It is based on the known conservation laws and permits determination of temperature and moisture profiles and droplet trajectories inside spray dryers. An industrial spray dryer used in the manufacture of detergents serves as an example to demonstrate the applica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-Crystalline Behavior in a Series of Fluorocarbon Side-Chain Polyesters. 2L. M. Wilson and A. C. GriffinCite this: Macromolecules 1994, 27, 16, 4611–4614Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
Abstract The quantification of the relative mineralogical composition of clay mixtures by powder X-ray diffraction or chemical mass balance methods has been severely hampered by a lack of representative standards. The recent development of elemental mass balance models that do not require standards for all minerals in…
The electronic structures and the ligand affinities of several nickel porphyrins with different types and degrees of macrocycle deformations have been studied by magnetic circular dichroism (MCD) spectroscopy. The nickel porphyrins studied in this work are nickel(II) octaethylporphyrin (NiOEP) with a mixture of planar…
Abstract The kaolin surface was modified through surface reaction in order to tailor the colloidal behaviour of the particles. A molecular weight series of polyethylene glycols was attached to the surface hydroxyls, using a urethane linker, by reaction with toluene 2,4‐diisocyanate. The change in the surface was monit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteroatomic Effects on the Acid-Catalyzed Rearrangements of Dispiro[4.0.4.4]tetradeca-11,13-dienesBruce M. Branan and Leo A. PaquetteCite this: J. Am. Chem. Soc. 1994, 116, 17, 7658–7667Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Pub…
Abstract Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were conducted on two common types of rye straws (Danko and Kustro) at a heating rate of 20°C/min in an oxidizing atmosphere (15% oxygen and 85% nitrogen, by volume) between ambient temperature and 700°C. The two step nature of the TGA c…
Characteristics of shallow n‐type layers formed by direct doping of phosphorus from the vapor phase are presented. Shallow doped layers can be formed with depths less than 100 nm using PH 3 as a source gas and hydrogen as a carrier gas. It is found that the phosphorus concentration on the surface is constant with the…
Future trends and recent developments of reinforcing materials and fabrication processing for advanced metal matrix composites are discussed in this paper. A national R & D project is currently underway to improve the oxidation resistance and heat resistance to 1773 K of continuous ceramics Si-Ti-C-O fibers (Tyranno f…