WS 2 nanotubes containing single-walled carbon nanotube bundles
Single-walled carbon nanotubes (SWCNs) encapsulated in multiwalled WS2 nanotubes are produced by pyrolyzing a mixture of WO3−x and SWCNs in N2/H2S atmosphere.
Materials Literature
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Fluorosilicone elastomer based on the poly[(3,3,3‐trifluoropropyl)methyl‐siloxane‐co‐(3,3,4,4,5,5,6,6,6‐nonafluorohexyl)methylsiloxane]
Abstract Fluorosilicone elastomer based on the poly[(3,3,3‐trifluoropropyl)methylsiloxane‐co‐(3,3,4,4,5,5,6,6,6‐nonafluorohexyl)methylsiloxane] was studied. First, the synthesis of fluorosilicone polymer based on the poly[(3,3,4,4,5,5,6,6,6‐nonafluorohexyl)methylsiloxane] (PNFHMS) was examined by the polymerization of…
Numerical diffusion-induced grain boundary motion
In this paper we consider the numerical approximation of phase field and sharp interface models for diffusion-induced grain boundary motion. The phase field model consists of a double-obstacle Allen-Cahn equation with a forcing obtained from the solution of a degenerate diffusion equation. On the other hand the sharp…
Triarylcorroles by Oxidative Coupling of Triaryltetrapyrranes
All articles of this category A general two-step, one-pot-synthesis of meso -triphenylcorrole from 5-phenyldipyrrane is presented. A number of p -phenyl-substituted 5-phenyldipyrranes were condensed with substituted benzaldehydes under acid catalyzed conditions to produce a mixture highly enriched in the corresponding…
Polarization reversal study using ultrasound
We found that the sound velocity changes drastically near the coercive field for a 0.955Pb(Zn1/3Nb2/3)O3–0.045PbTiO3 ferroelectric single crystal, which reflects that domain rotation occurred during polarization switching. This velocity change associated with polarization switching provides a powerful method to study…
Effect of current direction on the lifetime of different levels of Cu dual-damascene metallization
Electromigration in the lower metal (M1) and the upper metal (M2) of Cu dual-damascene interconnections has been studied. The failure times of M2 test structures are significantly longer than those of identical M1 structures. It is proposed that this asymmetry is the result of a difference in the location of void form…
Hydrogen-induced transport properties of holes in diamond surface layers
Three hydrogen-terminated diamonds with different surface roughness and morphologies have been investigated by conductivity and Hall experiments in the temperature regime 0.34–350 K. The sheet hole densities are weakly temperature dependent above a critical temperature Tc (20 K⩽Tc⩽70 K), below Tc carriers freeze out.…
Synthesis of 1,3,4-Oxadiazoles Using Polymer-supported Reagents
All articles of this category The preparation of a novel polystyrene-supported dehydrating agent and its application to the synthesis of 1,3,4-oxadiazoles under thermal and microwave conditions is described. An alternative procedure using tosyl chloride and P-BEMP is also presented. oxadiazoles - polymer-supported rea…
Optimal Cell Source for Cardiovascular Tissue Engineering: Venous vs. Aortic Human Myofibroblasts
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…
Stability of carbon nanotubes under electric field studied by scanning electron microscopy
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 nanocluster sensitized waveguide
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…
Whither Correlated Electron Theory?
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.
Force Chains, Microelasticity and Macroelasticity
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 on full 4-inch wafers
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…
Nanoparticles and the Environment
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…
Liquid Crystals :Experimental Study of Physical Properties and Phase Transitions
This book describes in detail various experimental techniques used in the study of liquid crystals.[...]
Mecanismo de biolixiviación de sulfuros metálicos
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…
Reactivity and expansion of electric arc furnace slag in their application in construction
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…
Atomistic Study of Structural Correlations at a Liquid-Solid Interface
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…
Ordering at Solid-Liquid Interfaces Between Dissimilar Materials
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.…