Materials Literature
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Arterial vascular cells have been successfully utilized for tissue engineering in human cardiovascular structures, such as heart valves. The present study evaluates saphenous vein-derived myofibroblasts as an alternative, easy-to-access cell source for human cardiovascular tissue engineering. Biodegradable polyurethan…
The influence of an applied electric field on carbon nanotubes protruding from a surface was investigated in situ using a high-resolution scanning electron microscopy. Under the applied electric field, the nanotubes flexed to orient themselves parallel to the electric field lines. For moderate field strengths below th…
Optical gain at 1.54 μm in erbium-doped silicon-rich silicon oxide (SRSO) is demonstrated. Er-doped SRSO thin film was fabricated by electron-cyclotron resonance enhanced chemical vapor deposition of silicon suboxide with concurrent sputtering of erbium followed by a 5 min anneal at 1000 °C. Ridge-type single mode wav…
This is the text of the 'Theory' opening talk at the 2001 Strongly Correlated Electron Systems conference. It contains opinions about some of the outstanding scientific challenges facing the theory side of the correlated electrons field.
It has been claimed that quasistatic granular materials, as well as nanoscale materials, exhibit departures from elasticity even at small loadings. It is demonstrated, using 2D and 3D models with interparticle harmonic interactions, that such departures are expected at small scales [below O(100) particle diameters], a…
Patterned growth of single-walled carbon nanotubes (SWNTs) is achieved on full 4-in. SiO2/Si wafers. Catalytic islands with high uniformity over the entire wafer are obtained by a deep ultraviolet photolithography technique. Growth by chemical vapor deposition of methane is found to be very sensitive to the amount of…
Volume 44 of Reviews in Mineralogy and Geochemistry contains descriptions of the inorganic and biological processes by which nanoparticles form, information about the distribution of nanoparticles in the atmosphere, aqueous environments, and soils, discussion of the impact of size on nanoparticle structure, thermodyna…
This book describes in detail various experimental techniques used in the study of liquid crystals.[...]
La biolixiviación se presenta como una de las técnicas hidrometalúrgicas del futuro para el tratamiento de concentrados minerales sulfurados, dadas sus ventajas ampliamente reconocidas. A pesar de ello, su implantación a nivel industrial no ha progresado en los últimos años porque aun no se ha resuelto la principal de…
EAF-slag have adequate technical properties for its use as aggregates. The MgO content is the main responsable of the expansions. The expansion produced affect in different way the new material depending of the rigidity of the matrices formed. EAF-slag shows hidraulicity and forms as reaction products CSH, calcium alu…
Structural correlations at a liquid-solid interface were explored with molecular dynamics simulations of a model aluminium system using the Ercolessi-Adams potential and up to 4320 atoms. Substrate atoms were pinned to their equilibrium crystalline positions while liquid atoms were free to move. The density profile at…
In an earlier report we explored structural correlations at a liquid-solid interface with molecular dynamics simulations of a model aluminium system using the Ercolessi-Adams potential and up to 4320 atoms. Substrate atoms were pinned to their equilibrium fcc crystalline positions while liquid atoms were free to move.…
A series of block copolymers functionalized with aromatic 1,3,4-oxadiazole and stilbene derivatives have been synthesized by the palladium catalyzed reaction between polystyrene- block -polyisoprene and different functional units. These polymers exhibited different emission properties in solution and in the solid stat…
The title trifunctional ligand has been prepared, and coordination chemistry with La(III), Pr(III), and Yb(III) has been examined to assess the ligand's chelation properties. In 1:1 complexes, the ligand binds in a bidentate mode to the Ln(III) ions through the pyridyl N-oxide group and unexpectedly with the “long-arm…
The photochemical and photooptical properties of the first-generation LC dendrimer with terminal azobenzene groups which forms a SmA mesophase in a wide temperature range have been studied. A comparative analysis of its photochemical behavior in a dilute solution and a thin film was carried out. Under the action of UV…
In the temperature range of 300-500 degrees C, solid nanocrystalline oxides react nearly stoichiometrically with numerous halocarbons, sulfur, and organophosphorus compounds. In some cases, the reaction efficiencies can be improved by the presence of a small amount of transition-metal oxide as catalyst; for example, F…
Stimulated by the report of high-yield, low-temperature catalytic conversion of methane to methyl bisulfate (Periana et al., Science 1998, 280, 560), we studied the relative stability and reaction mechanism of the Pt(NH 3 ) 2 Cl 2 and Pt(bpym)Cl 2 complexes in concentrated sulfuric acid. We find that the mechanism inv…
Three- and four-armed star-shaped poly(ε-caprolactone)s were synthesized from trimethylolpropane and pentaerythritol as initiators using fumaric acid as an activator of the monomer, respectively. Star-shaped poly(ε-caprolactone)s could be satisfactorily obtained, which was confirmed by size exclusion chromatography eq…
Addition of 2,2‘-bipyridyl to diamagnetic (Me 5 C 5 ) 2 Yb(OEt 2 ) gives the brown adduct (Me 5 C 5 ) 2 Yb(bipy). The solution 1 H NMR and electronic absorption spectra show that the bipyridyl complex is paramagnetic, containing a bipyridyl radical anion, which can also be detected in the solid-state infrared spectrum…
Reversion of the in-plane reorientation direction of mesogenic groups has been observed for the first time in novel polymethacrylate liquid crystal (PLC) films substituted with a 4-methoxycinnamoyloxybiphenyl side group. The reversion was generated by irradiation with linearly polarized ultraviolet (LPUV) light and a…