Materials Literature
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We activated silicon implanted with phosphorus atoms by infrared semiconductor laser annealing with a diamond-like carbon (DLC) optical absorption layer. The silicon samples implanted with phosphorus atoms at 10 and 70 keV with concentrations of 5 × 10 14 , 1 × 10 15 , and 2 × 10 15 cm -2 were coated with 200-nm-thick…
Unlike the solid dense medium, the low-porosity metals exhibit many unique dynamic behaviors. These properties have been investigated in this work for aluminum with a porosity of 3.3% under high velocity and planar plate impact. A push-pull-type velocity interferometer system for any reflector was used to measure the…
Sphärisch verflochten: Die Temperung einer verdünnten wässrigen Lösung von Poly(2-isopropyl-2-oxazolin) bei Temperaturen über dem Trübungspunkt führt zur Bildung eines Koagulats aus kristallinen Nanofasern (siehe Mikroskopaufnahme). Die gerichtete Kristallisation, die unterhalb der Glasübergangstemperatur des Polymers…
Abstract Two new copper indium thiolate complexes were obtained from the reactions of InCl 3 and HS n Bu with a combination of [Cu(NCMe) 4 ][PF 6 ] and 1,2‐bis(diphenylphosphino)ethane (dppe). In a mixture of methanol and MeCN solvent the complex [In 2 S n Bu 2 (μ‐S n Bu) 2 Cu 2 (μ‐dppe) 2 ] ( 3 ) was formed. When thi…
Compression adiabats for alumina-based nanopowders are obtained experimentally, various conditions of pulsed magnetic cylindrically symmetric radial compaction of the nanopowders are tested, and the density distribution in the compacted powders are measured. Using the compression adiabats obtained, quasi-static compac…
Various three phase microstructures of Mo-Si-B alloys were simulated in tensile loading conditions using a 2D finite element method to predict the elastic properties of the composite material. Voronoi structures with the same areal fraction of phases as the real microstructures have been generated and simulated simila…
Synthesis and micellar behavior of biaryl-based benzyl ether dendritic molecules prepared from a new biaryl building block are described. The key objective of the study is to tune the size of individual dendritic molecules and investigate its effect on aggregation behavior of the resulting micelle-like assemblies. We…
Orientation-controlled copper bicrystals containing symmetrical 70o [0 0 1] tilt boundaries were deformed in tension at 923 K and at three initial strain rates from 4.2 x 10-5s-1 to 4.2 x 10-3s-1. The load was applied parallel to the grain boundary so as to eliminate grain boundary sliding. The nucleation of dynamic r…
Abstract Photocatalytic deposition of Ag nanoparticles from AgNO3 aqueous solution onto TiO2 films (Ag/TiO2 films) was carried out by using ultraviolet light irradiation at room temperature. The Ag/TiO2 films were characterized by XRD, XPS, and SEM. The mean diameter of Ag nanoparticles on the film was estimated to be…
New alkali metal hydrogen tellurates have been synthesized, and their structures have been determined by X-ray crystallography. Hydrogen tellurates I–VI contain centrosymmetric binuclear anions [Te2O10H4+x ](4−x)−, where x=0, 1, 2. Hydrogen tellurates II and VI contain, in addition to the binuclear anion, mononuclear…
3N nickel has been deformed by equal channel angular pressing (ECAP) at 400°C up to 3 passes using route A. The texture with respect to position in the deformed billet, i.e. from top to bottom, has been measured with high-energy synchrotron radiation. It is characterized by texture components typical for simple shear…
Vertically aligned carbon nanotubes (CNTs) were grown on a stainless steel substrate (SUS304) by resistance-heating method in alcohols containing homogeneously dissolved cobaltocene Co(C5H5)2 as a catalyst source. Straight-chain primary alcohols, 1,2-ethanediol and cyclohexanol were used as carbon sources to examine t…
Photoluminescence (PL) properties of YPO 4 :Mn 2+ and Zr 4+ -doped YPO 4 :Mn 2+ have been investigated by measuring PL and PL excitation (PLE) spectra and electron spin resonance (ESR) spectra. The PL spectrum at 9 K is dominated by a red (R) emission band at 1.91 eV for YPO 4 :Mn 2+ and a blue-green (BG) emission ban…
The present investigation assessed the corrosion performance of 14 different Zn and Al sacrificial coating system configurations based on several different accelerated corrosion testing techniques. The coatings systems tested, which incorporated conversion coating layers, primers, and topcoats, were exposed in a marin…
We investigate electrical transient and stationary transport properties of semiconducting single-walled zigzag carbon nanotubes (CNTs), using a transient ensemble Monte Carlo (MC) simulator that self-consistently solves the semiclassical transport and Poisson equations. We developed the ensemble MC simulator to obtain…
Cathodoluminescence (CL) spectroscopy on BaTiO 3 enables one to determine stoichiometry, domain structures and residual stresses by a nanometer sized electron probe capable of integrating over a large sample surface. In domain-rich materials and to account for microscopic surface domains, a direct experimental assessm…
A series of novel star‐shaped carbohydrate derivative liquid crystals was synthesized with glucose as the chiral core structure. Glutamyl mesogenic moieties, l‐R‐{n‐[4‐(cholesteryloxycarbonyl)benzoyloxy]alkoxy}glutamic acid, were introduced to the five hydroxy groups of glucose by direct esterification. The chemical s…
We report magnetoelectric coupling at room temperature between ferroelectric and magnetic order parameters in a Pb1−xNixTiO3 (x=0.1, 0.3, and 0.5) system. These samples exhibited magnetism and ferroelectricity simultaneously at room temperature. The Ni substitution reduced the lattice distortion, i.e., c∕a ratio and,…
Polycrystalline nano-sized ferrites with the general chemical formula Mg1-x Znx Fe2O4 (where x = 0.1, 0.2, 0.3, 0.4 and 0.5) have been prepared from a simple polymer matrix based precursor solution. The solution was composed of metal nitrates with polymer PVA and Sucrose. Thermolysis of the precursor mass at about 773…
First and foremost, I would like to thank my advisor, Professor Sossina Haile, who has always been a great mentor to me. I feel so grateful to her for her patience and support through the course of my research.