Materials Literature
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Lack of an endothelial surface is the most important variable causing the relatively poor patency of synthetic bypass grafts. This study was designed to investigate the effect of endothelial cell seeding on small-diameter Dacron grafts seeded with microvascular endothelial cells from omentum, and to evaluate two metho…
Environmental scanning electron microscopy has been used to study ‘wet’ polymer latex films. Comparison of the results obtained by imaging in nitrogen and nitrous oxide gas and water vapour has provided insight into a variety of different contrast phenomena. Notably, it was found that edge definition and fine features…
Flow deformation and relaxation of mono- and bilayer domains of a thermotropic liquid crystal at the air−water interface have been studied by means of simultaneous application of extensional flow fields and Brewster angle microscopy measurements. In an extentional flow, mono- and bilayer domains are found to be distor…
The electronic structure and spectra of a family of nickel porphyrin complexes are analyzed using approximate density functional theory (DFT). The three complexes, Ni(OEP), Ni(OEP-C 4 SiMe 3 ), and Ni(OEP)(μ-C 4 )Ni(OEP) represent a logical increase in complexity starting from a simple metalloporphyrin. The spectra of…
Description STP 1270 features the latest information from the world's leading experts on how radiation impacts a wide range of metals. This extensive volume includes 68 peer-reviewed papers organized into 8 comprehensive categories: Modeling of Controlling Mechanisms -- 8 papers explore mechanisms controlling the beha…
Adsorption of CO, used as infrared molecule probe, was performed at room temperature or at low temperature (140 K), on either chlorine-free or chlorine-containing ceria, in order to investigate both the chlorine effect and the ceria reduction state. On ceria and Pd/ceria catalysts, chlorine acts as an electronegative…
The dihalide capped trinuclear nickel clusters Ni 3 (μ 3 -X) 2 (μ 2 -dppm) 3 (X = I ( 1a ), Br ( 1b ); dppm = Ph 2 PCH 2 PPh 2 ) were synthesized and converted to their respective monocations [Ni 3 (μ 3 -X) 2 (μ 2 -dppm) 3 ] + (X = I ( 1a + ), Br ( 1b + )) via a single electron oxidation. Clusters 1a and 1a + were cha…
A phenomenological rheological model was developed to describe the molecular interactions and predict the mechanical properties of fish myofibrillar protein-based films, irrespective of their thickness. The model was built of a parallel array of Maxwell and elastic elements in which a fracture element was introduced.…
Cross-linking of the seed latex polymer introduces elastic forces into the thermodynamic analysis of the morphology of composite particles. By determining the elastic storage energy necessary to maintain a deformation within the seed latex particle (as in an occlusion of second-stage polymer), it can be combined with…
A novel method of preparing thermally stable thin films with intrinsic second-order nonlinear optical activity is described. Design and synthesis yielded new ferroelectric bifunctional liquid crystalline acrylate monomer mixtures with a fast electro-optical response in the chiral smectic C (SmC*) phase. The ferroelect…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNaCu4S4, a Simple New Low-Dimensional, Metallic Copper Polychalcogenide, Structurally Related to CuSXiang Zhang, Mercouri G. Kanatzidis, Tim Hogan, and Carl R. KannewurfView Author Information Department of Chemistry, Michigan State University East Lansing, Michigan 48…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Strategy for Total Synthesis of Complex CardenolidesWei Deng, Mark S. Jensen, Larry E. Overman, Paul V. Rucker, and Jean-Paul VionnetView Author Information Department of Chemistry, 516 Physical Sciences 1, University of California, Irvine, California 92697-2025 Cite…
Kinetic data on the esterification of acetic acid with propyl alcohol catalyzed by the ion exchange resin DOWEX MONOSPHERE 650 C have been obtained using a stirred batch reactor. It was checked if there is an influence of pore diffusion and film resistance on the reaction rate when varying reaction temperature, initia…
Synthetic methods for [Et(4)N](4)[W(4)Cu(4)S(12)O(4)] (1), [Et(4)N](4)[Mo(4)Cu(4)S(12)O(4)] (2), [W(4)Cu(4)S(12)O(4)(CuTMEN)(4)] (3), and [Mo(4)Cu(4)S(12)O(4)(CuTMEN)(4)] (4) are described. [Et(4)N](2)[MS(4)], [Et(4)N](2)[MS(2)O(2)], Cu(NO(3))(2).3H(2)O, and KBH(4) (or Et(4)NBH(4)) were used as starting materials for…
Direct nonradiative energy transfer (DET) experiments were carried out on five polyisoprene−poly(methyl methacrylate) diblock copolymers with polyisoprene volume fractions ranging from 0.07 to 0.5 (polyisoprene microdomains dispersed in a poly(methyl methacrylate) matrix). These experiments yield the ratio R /δ of the…
The synthesis of 60−1000 Å thick films of fluorinated polymers on gold and silica substrates via amidation of layered, hyperbranched poly(acrylic acid) surface-graft films with a fluorinated octylamine is described. These syntheses proceed either by formation and fluoramidation of layers of poly(acrylic acid) or by st…
Heteronuclear complexes of the type Ln′xLn″1 –x[Co(CN)6]·nH2O have been synthesized for potential applications in solid oxide fuel cells. SmxEr1 –xCo and SmxYb1 –xCo complexes crystallize in the orthorhombic system, as do LaxSm1 –xCo complexes for x= 0-0.6. A plot of the lattice parameters of the orthorhombic structur…
Orientation correlations in a quiescently quenched, lamellar block copolymer were examined by a combination of depolarized light scattering and transmission electron microscopy. These experiments reveal exponential correlation functions with characteristic lengths that depend on the thermal history of the sample. The…
The boundary layer of PHA inclusion bodies isolated from Chromatium vinosum, Pseudomonas oleovorans, and Rhodococcus ruber was investigated by negative staining and transmission electron microscopy. A typical boundary layer exhibits a basic lattice composed of regularly arranged phasin molecules and phospholipids, for…
SummaryZinc-manganese has consistently attracted researchers as potentially the most corrosion resistant zinc alloy coating but to date is the most under-developed and yet to be commercially exploited to any significant degree. This paper reviews the current status of this alloy, outlining the research that has been c…