Materials Literature
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A multistep pulsed-laser deposition (PLD) process is presented for epitaxial, nominally undoped ZnO thin films of total thickness of 1 to 2 μm on c-plane sapphire substrates. We obtain reproducibly high electron mobilities from 115 up to 155 cm2/V s at 300 K in a narrow carrier concentration range from 2 to 5×1016 cm−…
The use of semiconductor nanocrystals (quantum dots) as fluorescent labels for multiphoton microscopy enables multicolor imaging in demanding biological environments such as living tissue. We characterized water-soluble cadmium selenide-zinc sulfide quantum dots for multiphoton imaging in live animals. These fluoresce…
Abstract For Abstract see ChemInform Abstract in Full Text.
Electron paramagnetic resonance (EPR) has been used to identify and characterize point defects in lithium triborate (LiB<sub>3</sub>O<sub>5</sub>) crystals grown for nonlinear optical applications. As-grown crystals contain oxygen vacancies and lithium vacancies (as well as trace amounts of transition-metal ions in a…
In duplex stainless steel, the two constituent phases, namely ferritic (α) and austenitic (γ) phases, have different crystal structure and chemical composition. They may thus exhibit different corrosion resistances in aqueous environment. In this investigation, an electrochemical technique with spatial resolution was…
Novel N-acylaminovinyl ketones of the benzo[b]thiophene series (AAB) capable of molecular switching of fluorescence or complexation with metal ions have been synthesized and their photochromic behavior studied using UV-Vis absorption/emission and 1 H-/ 7 Li-NMR spectroscopy. Under UV irradiation the AAB compounds 2a-c…
Abstract The synthesis of polyacrylonitrile‐ block ‐poly(ethylene oxide) (PAN‐ b ‐PEO) diblock copolymers is conducted by sequential initiation and Ce(IV) redox polymerization using amino‐alcohol as the parent compound. In the first step, amino‐alcohol potassium with a protected amine group initiates the polymerizatio…
Abstract Single-crystal X-ray diffraction experiments were carried out on roscoelite crystals from Reppia, Val Graveglia, Italy. Roscoelite [structural formula: XII (Ba 0.006 K 0.994 ) IV (Si 3.150 Al 0. 850 ) VI (Al 0.04 0 Fe 0.150 Mg 0.100 Mn 0.062 V 1.69 6 Ti 0.003 )O 10 (OH) 2 ] shows a near-perfect three-dimensio…
Abstract H 2 and CO 2 transport properties were investigated on semicrystalline poly(ethylene‐2,6‐dicarboxylate naphtalene) (PEN) films and biaxially stretched films and analyzed in terms of solubility and diffusion. The decrease of the permeability observed on the thermally crystallized samples has been described by…
We present a stochastic model of dynamically interacting grains in one dimension, in the presence of a low vibrational intensity, to investigate the effect of shape on the statics and dynamics of the compaction process. Regularity and irregularity in grain shapes are shown to be centrally important in determining the…
Abstract Clays of a soil sequence with five profiles in the Val Genova (northern Italy) along an elevation gradient with climate ranging from moderate to Alpine were investigated with XRD using several diagnostic treatments. Smectites developed in the surface horizons of podzolic soils either from chlorite through the…
In situ methods are ideally suited for the study of the development of property-critical structural features during materials processing. As an example of their potential in the area of complex oxide electroceramics, here, we apply in situ synchrotron powder diffraction to investigate the ordering processes responsibl…
In this paper we compare the results of three ferroelectric materials that exhibit unusual smectic-A (SmA) phases. These phases have been assigned to chiral analogs of the de Vries SmA phase. Several experimental techniques have been employed for this investigation. The possible molecular structures of de Vries SmA* p…
Interpolyelectrolyte complex (IPEC) formation between sodium poly( l -glutamate) and poly(amido amine) dendrimer in aqueous solution containing 0.25 M NaCl was studied as a function of pH by light scattering. The formation of soluble IPECs upon protonation of the dendrimer at 11 > pH > 9.1 was followed from the increa…
Ternary vapor−liquid equilibria (VLE) of selected aqueous azeotropic systems in the presence of differently branched hydroxyl functional components (additives) have been measured. Three azeotropic mixtures, ethanol + water, 2-propanol + water, and tetrahydrofuran + water, were chosen. The additives used were nonvolati…
Durch Ausfüllen der Poren in der Kristallisations-Vorstufe mit Kohlenstoff bleibt die zweidimensionale hexagonale Ordnung von gemischtem Niob-Tantal-Oxid erhalten. Beim Erhitzen unter Inertgas kristallisiert das Produkt, ohne dass die mesoporöse Struktur verlorengeht. Das Kohlenstoff-Templat kann durch Calcinierung an…
Abstract Well crystallized ZnO powders with various morphologies such as hour glass‐shaped, shortened prismatic, flake‐like and prismatic form have been synthesized by adopting the system of Zn(Ac) 2 ‐KOH‐H 2 O via a hydrothermal process at 200 °C for 2 h. It was found that the as‐synthesized hour glass‐shaped ZnO cry…
As a model catalyst, gold and iridium were co-deposited on a single crystal of rutile TiO2 using the deposition precipitation method in order to clarify the synergetic effect of the combination of Au with Ir on the catalytic performance of the oxidative decomposition of odour and dioxins. Analyses by means of high-res…
We report neutron scattering results on the spin dynamics in the paramagnetic (PM) and ferromagnetic (FM) states of the 50% hole-doped manganites ${\mathrm{Pr}}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3}$ and ${\mathrm{Nd}}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3}.$ In the PM phase, these systems exhibit two kinds o…
The bulk (Fe,Ti,O) phase diagram is strongly modified at the nanometer scale: instead of the mixture of the rhombohedral and pseudo-brookite phases normally present in the micrometer range, a single fcc phase is stabilized for grain size lower than 25 nm. The existence of a single phase permits the formation of small…