Materials Literature
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We report a detailed quantum-chemical investigation of donor-acceptor substituted dipolar nonlinear optical chromophores incorporating the 4-(dimethylamino)phenyl donor end group and a variety of strong heterocyclic acceptor end groups, including tricyanofurans and tricyanopyrroles. In particular, we study the variati…
Abstract The surface of an as‐polished and an as‐sintered yttria‐stabilised zirconia pellet was analysed with XPS and TOF‐SIMS (depth profiling and imaging) in order to study the distribution of impurities. The polished sample was slightly contaminated with Na, K, Mg and Ca. The sintered sample showed a thin surface f…
Ab initio electronic structure calculations within density functional theory have been performed to study the structural, electronic, and magnetic properties of transition metal impurities into a Ge matrix. We examine impurities of single isolated transition metal (TM) over the $3d$ series $(\mathrm{TM}=\mathrm{V},\ma…
Thin oxide films grown on metal substrates are widely used in surface science to model bulk oxides, assuming their chemical and electronic properties to be similar. In some cases, however, this might not be justified as the present scanning tunneling microscopy studies demonstrate for Au atoms on a thin alumina film o…
A comprehensive three-dimensional (3D) microanalysis procedure using a combined scanning electron microscope (SEM)/focused ion beam (FIB) system equipped with an energy-dispersive X-ray spectrometer (EDS) has been developed. The FIB system was used first to prepare a site-specific region for X-ray microanalysis follow…
Living free radical polymerization of a variety of monomers using dithiocarbarmate photoiniferter modified silicate gave dispersed polymer/silicate nanocomposites, even for nanocomposites with very high silicate contents (7−63 wt %). Thus, nanocomposites containing polystyrene, poly(methyl methacrylate), poly( tert -b…
In order to obtain well-dispersed Cu nanoparticles, we synthesized Cu nanoparticles by using thermal decomposition of Cu-oleate complex, which was prepared by the reaction with CuCl2 and sodium oleate in aqueous condition. The resulting well-dispersed Cu nanoparticles were synthesized by autoclave. TEM image showed we…
Paramagnetic, purely organic, chiral liquid crystals showing a thermally stable smectic C* phase with low viscosity over a wide temperature range (between 50 and 90 °C) have been successfully prepared for the first time. Their ferroelectric properties have been characterized by measuring the spontaneous polarization,…
The hole current density flowing through and around proton-irradiated areas of $p$-type silicon during electrochemical anodization is simulated and studied experimentally using scanning electron microscopy and photoluminescence imaging. It is shown that for certain irradiation geometries the current flow may be either…
We characterized the interactions of meso-tetrakis(4N-(2-hydroxyethyl)pyridinium-4-yl) porphyrin (TEtOHPyP4), meso-tetrakis(4N-allylpyridinium-4-yl) porphyrin (TAlPyP4), and meso-tetrakis(4N-metallylpyridinium-4-yl) porphyrin (TMetAlPyP4) with the poly(rA)poly(rU) and poly(rI)poly(rC) RNA duplexes between 18 and 45 de…
The scales involved in modern semiconductor manufacturing and microelectronics continue to plunge downward. Effective and accurate characterization of materials with thicknesses below a few nanometers can be achieved using x-rays. While many books are available on the theory behind x-ray metrology (XRM), X-Ray Metrolo…
The new dibranched, heterocyclic "push-pull" chromophores bis{1-(pyridin-4-yl)-2-[2-(N-methylpyrrol-5-yl)]ethane}methane (1), 1-(pyrid-4-yl)-2-(N-methyl-5-formylpyrrol-2-yl)ethylene (2), {1-(N-methylpyridinium-4-yl)-2-[2-(N-methylpyrrol-5-yl)]ethane}{(1-(pyridin-4-yl)-2-[2-(N-methylpyrrol-5-yl)]ethane}methane (3), N-m…
The syntheses of new bis[octakis(hexylthio)phthalocyaninato] rare-earth metal(III) double-decker complexes [(C6S)8-Pc]2M (M = Gd(III), Dy(III), and Sm(III)) (2-4, respectively) are described. These compounds are very soluble in most common organic solvents. They have been fully characterized using elemental analysis,…
Size-controllable monodisperse PbSe and PbSe/PbS nanocrystals (NCs) have been successfully synthesized with a solvothermal method. Octadecylamine (ODA) molecules were found effective in organizing the nanocrystals to form an ordered monolayer. It is expected that these narrow-band-gap semiconductor NCs with tunable si…
Manganese phosphide (MnP) nanorods have been prepared by high-temperature injection of Mn 2 (CO) 10 dissolved in octadecene into a hot (350 °C) surfactant mixture of trioctylphosphine oxide (TOPO) and trioctylphosphine (TOP). Uniform short rods (20.3 ± 3.6 nm × 5.2 ± 0.89 nm), grown along the b axis of orthorhombic Mn…
Asymmetric epoxidation of olefins with 30 % H2O2 in the presence of [Ru(pybox)(pydic)] 1 and [Ru(pyboxazine)(pydic)] 2 has been studied in detail (pybox = pyridine-2,6-bisoxazoline, pyboxazine = pyridine-2,6-bisoxazine, pydic = 2,6-pyridinedicarboxylate). 35 Ruthenium complexes with sterically and electronically diffe…
A study is presented of the self-assembly of a lamella-forming blend of a diblock copolymer and its respective homopolymers on periodically patterned substrates consisting of square arrays of spots, that preferentially attract one component, as a function of pattern dimensions and film thickness. The blend morphology…
Routes for the synthesis of a series of [2]rotaxanes and [2]catenanes incorporating porphyrin, ferrocene and fullerene moieties by the Sauvage metal template technique are described. Photophysical studies on these materials show that excitation of the porphyrin component causes a series of events along an energy gradi…
INTRODUCTION TO FRACTOGRAPHY Dimple Rupture Cleavage Fatigue Intergranular PHYSICAL METALLURGY OF TITANIUM ALLOYS Introduction Application of Titanium Alloys Effect of Alloying Elements Types of Titanium Alloys Alpha (alpha) Alloys Near alpha Alloys alpha + ss Alloys Metastable ss Alloys Beta Alloys Titanium Aluminide…
This review traces the development of X-ray mapping from its beginning 50 years ago through current analysis procedures that can reveal otherwise obscure elemental distributions and associations. X-ray mapping or compositional imaging of elemental distributions is one of the major capabilities of electron beam microan…