Materials Literature
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A versatile hybrid processing method that combines electrostatic deposition of microparticles and subsequent anisotropic plasma etching is described that can generate superhydrophobic engineering surfaces with tunable bimodal roughness and a thin hydrophobic fluorocarbon film. These surfaces exhibit contact angles wit…
Fundamental processes leading to the erosion of hydrocarbon films due to energetic argon ions and hydrogen atoms have been investigated using molecular dynamics simulations. A generic mechanism has been identified for carbon erosion due to energetic (150 eV) argon ions in the presence of sub-eV hydrogen atoms. This su…
Biomaterials have been widely used to prepare synthetic vascular grafts over the past thirty years, but the inherent thrombogenicity of their surface can lead to graft failure. Endothelial progenitor cells (EPC) are circulating premature cells able to differentiate in either myocardial or endothelial cells (EC). The t…
In electron-doped LaMnO3, La is partially substituted by tetravalent Ce, and Mn has a valence between 2 and 3. Mn2+ ions have five localized 3d electrons (half-filled shell) and a spin S*=5∕2. The Mn3+ configuration corresponds to an eg hole in the half-filled shell yielding a total spin S=2. A mean-field slave-boson…
We demonstrate control over heat flow in an N -terminal molecular junction. Using simple model Hamiltonians we show that the heat current through two terminals can be tuned by the temperature and coupling parameters of external gating reservoirs. We discuss two models: A fully harmonic system and a model incorporating…
Results concerning the preparation and characterization of electrochemically deposited (Fe1−xGax∕Fe1−yNiy)n (x=0.1–0.3at.%; y=0.4–0.8at.%) multilayered films and nanowires arrays are reported for the first time. The layers have been deposited successively by changing the electrodeposition potential. The combination of…
Abstract Polypropylene/sawdust composites have been prepared according to a statistical experimental design, with varying sawdust and compatibilizer (maleic anhydride grafted PP) concentrations. To investigate process conditions, composites were first extruded in a twin screw extruder coupled to a Haake torque rheomet…
Electrospinning of sol–gels has been used to produce zirconium‐doped polymer microfibers from zirconyl chloride and poly(vinylpyrollidone) precursors. Calcination of these structures between temperatures of 370° and 930°C resulted in the formation of zirconia nanograined microfibers whose diameters ranged from 1200 to…
The (pseudo)polymorphism of ethinyl estradiol was investigated via extensive crystallization experiments. Four new crystal structures of ethinyl estradiol solvates that resulted from this study are presented. They contain dioxane, nitromethane, ethanol, or dimethylformamide. The crystal structures of the hemihydrate,…
Current oscillations are used to study the effect of chlorate and perchlorate ions on the iron passivity in sulphuric acid solutions. Quasi steady-state current–potential and potentiostatic current–time curves show the emergence of complex current oscillations, besides the simple periodic ones attributed to general co…
Spherical aggregates of palladium nanoparticles were produced by stirring palladium(II) acetate with dendritic molecules (i.e., octa(3-aminopropyl)silsesquioxane octahydrochloride (POSS-NH3+) or the amine-terminated G1.0 poly(amidoamine) dendrimer (G1-NH2)) in methanol at room temperature via self-organized spherical…
We examine the effect of composition fluctuations on the stability of the orthorhombic Fddd network phase in the diblock copolymer melt phase diagram within the self-consistent Hartree approximation to the Landau-Brazovskii theory. For weak fluctuations, the Fddd structure is an equilibrium phase; however, stronger fl…
Two series of self-organized hexagonal arrays of uniaxial Permalloy nanowires are grown by electroplating, filling of nanopores in anodic alumina films. Nanowires with periodicities of 65 and 105nm and wire diameter of 25–60nm were investigated by magnetization and ferromagnetic resonance (FMR) measurements. The lengt…
Carbon black is widely used as an active filler in the rubber industry to improve the physical properties of rubber. The surface energy of carbon black is high compared to that of various elastomers like styrene–butadiene rubber (SBR), butadiene rubber (BR) and ethylene–propylene–diene rubber (EPDM). The work aims at…
Abstract Only few composites with tailored thermal expansivity exist, even fewer with negative thermal expansivity fillers, and none are well characterised. Zirconium tungstate has an isotropic negative coefficient of thermal expansivity, and the overall coefficient of thermal expansivity (CTE) of a range of zirconium…
Bi 4 Ti 3 O 12 (BIT) coprecipitated powders sinter in the presence of a transitory liquid phase, which strongly enhances the diffusion of matter and also the anisotropic growth of BIT grains. However, by coating the surface of BIT particles with WO 3 the aspect ratio of the platelets can be controlled. This, in additi…
Twenty thermophilic/thermotolerant fungal strains were isolated from compositing soils and screened for production of different enzymes (Endoglucanases, β-glucosidase, Fpase and xylanases) to assess their deinking efficiency. Three isolates, Aspergillus sp. AMA, Aspergillus terreus AN1,and Myceliophthora fergusii T4I,…
Phase equilibria in the ternary Nb-Ni-Y system are studied experimentally for the first time using x-ray diffraction, electron probe microanalysis, and differential scanning calorimetry in combination with levitation experiments. No ternary compounds exist, while the solubility of third element in binary solid phases…
A TiNi/diamond-like-carbon (DLC) microcage has been designed for biological applications. The structure is composed of a top layer of TiNi film and a bottom layer of highly compressively stressed DLC for upward bending once released from the substrate. The fingers of the microcage quickly close through the shape memor…
Shape-memory polymers (SMPs) are being increasingly proposed for use in biomedical devices. This paper investigates the cytotoxicity, surface characteristics and thermomechanics of two acrylate-based SMP networks as a function of sterilization using a minimal essential media elution test, FTIR-ATR and dynamic mechanic…