Materials Literature
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We report the results of a thorough study of the magnetocaloric effect (MCE) in a La0.7Ca0.3MnO3 single crystal, which undergoes a first-order magnetic phase transition at ∼227 K. The magnetic entropy change ΔSM and the adiabatic temperature change ΔTad reach, respectively, ∼6.42 J/kg K and 4.76 K for ΔB=5 T and even…
A detailed study on the influence of particle size varied from 8 nm to 53 nm on the structural and magnetic properties of La0.8Sr0.2MnO3−δ has been done. The unit cell volume increases and the microstrain in the compound shows peak formation as the particle size decreases. Nano particles of La0.8Sr0.2MnO3−δ exhibit su…
For modeling the magnetic properties of concentrated and diluted magnetic semiconductors, we use the Kondo-lattice model. The magnetic phase diagram is derived by inspecting the static susceptibility of itinerant band electrons, which are exchange coupled to localized magnetic moments. It turns out that rather low ban…
We investigate the applicability of the synchronous relaxation (SR) algorithm to parallel kinetic Monte Carlo simulations of simple models of thin-film growth. A variety of techniques for optimizing the parallel efficiency are also presented. We find that the parallel efficiency is determined by three main factors $-$…
An ionically controlled nanoscopic molecular gate has been developed by using functionalized mesoporous materials. The system shows that control of mass transport at nanometric scale can be achieved by using suitable rigid solids and pH-active molecules. The design principle suggests new perspectives in the search of…
In this Letter, we report on the densest-known packings of congruent ellipsoids. The family of new packings consists of crystal arrangements of spheroids with a wide range of aspect ratios, and with density phi always surpassing that of the densest Bravais lattice packing phi approximately equal to 0.7405. A remarkabl…
The optical and morphological characteristics of vanadium dioxide nanoparticles and thin films during their nucleation and growth phases have been studied by correlating the temperature and sharpness of the transition with the processing parameters. Thermal annealing results in grain growth and improved crystallinity.…
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…