Materials Literature
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Die Welt ist klein! Eine neue Klasse von Einkristall-Nanodrähten auf Lanthanoidhydroxid-Basis konnte durch Hydrothermalsynthese erschlossen werden (Beispiel siehe Bild). Durch Änderungen des chemischen Potentials und des pH-Werts lassen sich Größe und Eigenschaften der Materialien gezielt beeinflussen. Eine von vielen…
Pt /( Ba 0.7 Sr 0.3 ) TiO 3 ( BST )/ YBa 2 Cu 3 O 7−x ( YBCO ) capacitors on SrTiO3 substrates were fabricated, and the temperature dependence of their current–voltage characteristics was studied in the temperature range from 100 to 300 K. It was found that the leakage current strongly depends on the voltage polarity…
Unter Strom: Die Tieftemperaturzüchtung von Ge-Nanodrähten gelang durch chemische Abscheidung von GeH4 auf ein mit Au-Nanopartikeln beschichtetes SiO2-Substrat (siehe Bild). Diese Technik, die die Synthese von Einkristall-Nanodrähten unter mildesten Bedingungen ermöglicht, kann auch für die Strukturbildung auf vorgemu…
Erbium-doped TiO2 (TiO2:Er) thin films with the anatase structure have been prepared on Si substrate by laser ablation. Sharp and intense Er-related emission in the visible region as well as in the IR region has been observed under over-band-gap excitation. The broad photoluminescence (PL) peaking at about 530 nm newl…
Ja, W@Au12 ist ikosaedrisch! Hier wird die experimentelle Bestätigung dieser vor kurzem postulierten neuen Klasse von Gold-Clustern gegeben. Durch Anionen-Photoelektronen-Spektroskopie und relativistische Dichtefunktionalrechnungen wird gezeigt, dass sowohl W@Au12 als auch Mo@Au12 hochstabile, ikosaedrische Cluster mi…
We report the dielectric and viscoelastic relaxations in undiluted amorphous poly( d,l -lactic acid) (PLA). Three dielectric relaxations designated as α n, α s, and β are observed in order of decreasing temperature. The relaxation time for the α n relaxation increases with increasing molecular weight and is assigned t…
The surface structure sensitivity of the water−gas shift (WGS) reaction (CO + H 2 O → CO 2 + H 2 ) over the Cu(111), Cu(100), and Cu(110) surfaces has been studied by first-principles density functional calculations together with the UBI-QEP approach. The Cu( hkl ) surfaces are simulated by the Cu 10 and Cu 14 cluster…
A noncentrosymmetric crystal structure of CsCdBr(3) has been successfully observed with X-ray single-crystal structure analysis. It crystallizes in the hexagonal space group P6(3)mc, with a = 7.7281(14) A, b = 7.7281(14) A, c = 6.742(2) A, alpha = 90 degrees, beta = 90 degrees, gamma = 120 degrees, Z = 2. It was obtai…
Differential scanning calorimetry under a magnetic field H has been used to measure the entropy change $\ensuremath{\Delta}S$ at the magnetoelastic transition in ${\mathrm{Gd}}_{5}({\mathrm{Si}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}{)}_{4}$ alloys, for $x<~0.5.$ We show that $\ensuremath{\Delta}S$ scales with the tra…
Dense powder of nanocrystalline ZnO has been recovered at ambient conditions in the metastable cubic structure after a heat treatment at high pressure (15 GPa and 550 K). Combined x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS) experiments have been performed to probe both long-range order and local cr…
Spherical submicron mesoporous particles possessing two-dimensional hexagonal order have been produced by evaporation-induced self-assembly in aerosols generated from acidic (pH ≈ 2) aqueous solutions of tetraethoxysilane (TEOS) and the surfactant cetyltrimethylammonium bromide (CTAB). Particle internal structure cons…
The molecular complex [Re(=CtBu)(=CHtBu)(CH2tBu)2] 1 reacts with a silica partially dehydroxylated at 700 degrees C to give syn-2, [(=SiO)Re(=CtBu)(=CHtBu)(CH2tBu)], as a single isomer according to mass-balance analysis, IR, and solid-state NMR spectroscopy. 1D and 2D solid-state NMR (HETCOR and long-range HETCOR) on…
In this letter, we describe the preparation of a versatile polymer ligand, which can be attached to CdSe/ZnS semiconductor nanocrystals via a phase transfer reaction. The ligand is based on a chain of reactive esters, which can, in principle, be substituted by any compound containing amino-functionalities. The polymer…
A combination of static and dynamic laser light-scattering techniques was used to monitor an unusual slow self-assembly of giant polyoxomolybdate-based molecules into vesicle structures in dilute aqueous solution. Contrary to the behavior of common inorganic ions, these giant molecules need months to reach an equilibr…
Single-walled carbon nanotubes (SWNT) were covalently modified with DNA via carbodiimide-assisted amidation, yielding a highly water-soluble adduct. The specific and nonspecific interactions between DNA and SWNTs were examined by UV−vis spectroscopy and confocal fluorescence microscopy. Fluorescence imaging of individ…
Solvothermal synthesis in a monodentate ligand, namely, n-butylamine, is a general route for the synthesis of semiconductor chalcogenide nanorods from cheap inorganic reactants. The amine proved to be a good shape controller for producing CdS, CdSe, ZnSe, and PbSe nanorods (see picture) under relatively mild condition…
Bulk quantities of single-crystal MoO3 nanobelts were synthesized by a low-temperature, simple solution method without using any templates or catalysts. X-ray powder diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, selected area electron diffraction, and energy-dispersiv…
Abstract Residual lignocellulosic flour from spruce and ground olive stone was used as a natural filler in poly(hydroxybutyrate‐co‐valerate) (PHBV)‐based composites. The morphology and the thermal properties of these composites were investigated by scanning electron microscopy and differential scanning calorimetry, re…
Nanoelectrode arrays (NEAs) were fabricated from low site density aligned carbon nanotubes (CNTs). The CNTs were grown by plasma-enhanced chemical vapor deposition on Ni nanoparticles made by electrochemical deposition. Each nanotube is separated from the nearest neighbor by several micrometers. NEAs of 1 cm 2 consist…
Mg–Ni alloy thin films were prepared by dc magnetron sputtering using Mg and Ni targets, and their optical switching property for hydrogen exposure has been investigated. Pd-capped MgNix (0.1&lt;x&lt;0.3) films show a good switchable mirror property. Optical transmittance of these Mg-rich Mg–Ni thin films in t…