Materials Literature
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We study experimentally the behaviour of a drop deposited on a conical fibre. It is shown that for wetting liquids, such a drop spontaneously moves towards the region of lower curvature. The driving force is measured and shown to be a gradient of Laplace pressure, which allows us to characterize the dynamics of these…
Carbon nanotube field-effect transistors with structures and properties near the scaling limit with short (down to 50 nm) channels, self-aligned geometries, palladium electrodes with low contact resistance, and high-κ dielectric gate insulators are realized. Electrical transport in these miniature transistors is nearl…
Einer „schälbaren Banane“ ähnliche Moleküle entstehen durch Verküpfung einer gekrümmten Einheit mit einem stabförmigen Mesogen über einen flexiblen aliphatischen Spacer. Dieses neuartige niedermolekulare organische System zeigt einen Übergang von einer biaxialen nematischen (Nb) Phase zu einer biaxialen smektischen A-…
Cyanoacrylate–carbon nanotube arrays are prepared by embedding carbon nanotube (CNT) arrays grown on silicon substrate in cyanoacrylate adhesive. Upon laser treatment, enhanced field emission properties are obtained. Moreover, the binding force between the carbon nanotubes and the substrate is strengthened by the cyan…
Abstract Summary: Polyesters and polyolefins form highly incompatible blends with poor properties and gross morphology that hinder any practical applications. In this work, the possibility to compatibilize an incompatible blend of poly(butylene terephthalate) (PBT) with ethylene vinyl acetate (EVA) by adding a bis‐oxa…
The crystal structure of the layered, perovskite-related ${\mathrm{LaTiO}}_{3.41}$ $({\mathrm{La}}_{5}{\mathrm{Ti}}_{5}{\mathrm{O}}_{17+\ensuremath{\delta}})$ has been studied by synchrotron powder x-ray diffraction under hydrostatic pressure up to $27\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ $(T=295\phantom{\rule{0.3e…
The uniaxial compression of a monolayer of nanosized monodisperse spherical particles adsorbed at a planar interface is simulated using the Brownian dynamics technique. Initially, the particles spread at the interface form crystalline loosely interconnected clusters. As the interface is compressed, the gaps between th…
Indium hydroxide (In(OH) 3 ) nanorods have been synthesized via a novel hydrothermal process at 200 °C without addition of any surfactant. X-ray diffraction (XRD) patterns show that the nanorods are indium hydroxide. The selected area electron diffraction (SAED) patterns indicate that the In(OH) 3 nanorods are single…
This paper tests an approach to the estimation of relative particle bond strength based on the nondimensional floc and aggregation factors. The strength of flocs formed by aggregating nanosized silica particles with the addition of potassium chloride (KCl) or cationic surfactants, alkyltrimethylammonium bromide (mixtu…
Im Titan(IV)-substituierten Polyoxowolframat [{β-Ti2SiW10O39}4]24− (1) sind vier β-Keggin-Einheiten durch Ti-O-Ti-Bindungen zu einer cyclischen Struktur verknüpft (siehe Bild, WO6 rot, TiO6 grün, SiO4 blau). In der Synthese von 1 wurde die dilakunare Vorstufe [γ-SiW10O36]8− eingesetzt. Aus den Untersuchungen ergeben s…
A survey and analysis of Protein Data Bank (PDB) depositions from international synchrotron radiation facilities, based on the latest released PDB entries, are reported. The results (http://asdp.bnl.gov/asda/Libraries/) show that worldwide, every year since 1999, more than 50% of the deposited X-ray structures have us…
Prior syntheses of porphyrins bearing meso-formyl groups have generally employed the Vilsmeier formylation of an acid-resistant copper or nickel porphyrin. A new approach for the synthesis of free base porphyrins bearing one or two (cis or trans) meso-formyl substituents entails the use of a dipyrromethane bearing an…
Making heterolayered perovskite materials constitutes an approach for the creation of better dielectric and ferroelectric properties. In the experiment reported here, heterolayered PZT40/PZT60 films were grown on Pt/Ti/SiO2/Si (100) by a chemical solution deposition. The dielectric constant of the heterolayered thin f…
We have fabricated thermoelectric devices using InN and Al0.25In0.75N prepared by radio-frequency sputtering. The devices are composed of (a) Al0.25In0.75N–chromel of 20 pairs on SiO2 glass, (b) InN–chromel of 20 pairs on SiO2 glass, and (c) InN-chromel of 20 pairs on polyimide film. The maximum output power and the o…
Foam films stabilized by a sugar-based nonionic surfactant, beta-dodecyl maltoside, are investigated. The film thickness and the film contact angle (which is formed at the transition between the film and the bulk solution) are measured as a function of NaCl concentration, surfactant concentration, and temperature. The…
Abstract A novel diperoxoheptatungstate was crystallised as a Cs + −CN 3 H 6 + −(C 2 H 5 ) 2 NH 2 + salt and characterised by a single‐crystal X‐ray diffraction method. The anion has a Lindqvist heptametallate structure. The metal atoms are located in a bent 2‐3‐2 arrangement with the central W 3 section (W3, W4 and W…
Abstract By correlating the curvature of carbon nanotubes to the orientation of fibers in a polymer, the effect of the curvature of nanotubes on the tensile modulus of carbon‐nanotube‐reinforced polymer composites was investigated with a numerical simulation method. The simulation results showed that the tensile modul…
Abstract Hexabutyl guanidinium acetate (HBG · OAc) was synthesized and successfully used as a catalyst for the ring‐opening polymerization (ROP) of lactides. The experimental results indicated that the guanidinium salt HBG · OAc showed satisfactory catalytic behavior. Polymerization in bulk (120 °C, 18 h) produced pol…
In this work, a detailed nonisothermal model for a solid-state polymerization reactor of poly(ethylene terephthalate) (PET) is developed, discussed, and analyzed. The suggested model simulates the dynamic behavior of a continuous moving-bed reactor for the PET solid-state polymerization (SSP) process. The system of pa…
We report the observation of hundreds of oscillations in oblique-incidence optical reflectivity difference from a growth surface of Nb-doped ${\text{SrTiO}}_{3}(100)$ during a continuous, pulsed-laser deposition. Similar to in-phase specular reflection of thermal helium atoms or electrons, the optical oscillations ori…