Materials Literature
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Lead zinc niobate [PZN: Pb(Zn1/3Nb2/3)O3] and compositions in the PZN-PbTiO3 system are promising materials for capacitors and actuators because of their high dielectric constant and excellent electrostrictive properties in single crystal form. PZN is one of the few relaxor ferroelectrics with high Curie temperature o…
The aim of this study was to investigate the effects of ultrasound irradiation on a biodegradable drug delivery system. Microporous, disk-shaped specimens of a 50-50% copolymer of polylactic and polyglycolic acids were gel cast from an acetone solution. A protein was incorporated in these specimens, which were then im…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrivanadium Polyoxoanion Chemistry. Part 4. Synthesis, Isolation, and Spectroscopic Characterization of Trivanadium Polyoxoanion-Supported (C5H5)Ti3+: (Bu4N)4[CpTi.cntdot.SiW9V3O40] and (Bu4N)6[CpTi.cntdot.P2W15V3O62]Brian M. Rapko, Matthias Pohl, and Richard G. FinkeCite th…
We investigate the efficiency of two recently introduced hybrid Monte Carlo algorithms for the off-lattice simulation of dense polymer melts. Their performance is assessed both with respect to the molecular dynamics method and new single-chain Monte Carlo techniques proposed recently. Our findings show that the long-t…
Ceramic films, containing AI 2 O 3 , with up to 40 vol% ZrO 2 , have been fabricated using the tape casting process. Finer powders (average mean diameter of 250–300 nm) than have generally been reported for tape casting were used in this study. The optimum formulation for tape casting is affected substantially by decr…
The effects of UV irradiation on the properties of gel films prepared from Zr- n -butoxides modified with acetylacetone (AcAc) have been studied. The irradiation with UV light corresponding to the π-π * transition in the chelate ring of AcAc was found to dissociate the chelate bonds in the gel films and simultaneously…
Thermal and mechanical properties, H. Brody textile properties, D.W. Lloyd dyeability 1 - nylon fibres, D.M. Lewis dyeability 2 - polyacrylonitrile and polyester fibres, S.M. Burkinshaw clothing and fabrics, I. Holme carpets, E.D. Williams nonwovens, P.A. Smith rubber composites, S.K. Chawla high performance fibres 1…
Calculations of the phase transition temperature and the critical concentration of electric dipoles which induce in the host crystal lattice the phase transition with the appearance of long-range order are carried out. These calculations are made by considering the additional static random electric fields owing to def…
The efficiency of thermoelectric devices are analyzed for a superlattice of semiconductor quantum wells. It is assumed that the quantum wells are the thermoelectric active elements, and the layers between conduct only heat. It is shown that the efficiency of the device depends on the property of both layers.
An experimental investigation of the flexural properties of a variety of brittle multilayer materials has been conducted. The results have been compared with the predictions of a model presented in a companion paper. Three types of systems have been studied. The first consisted of glass sheets bonded together with a t…
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.…