Materials Literature
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GaAs(100) layers grown by low-temperature (LT) molecular beam epitaxy were studied by means of valence-band and core-level photoelectron spectroscopy. Small differences were found between valence-band spectra from the LT layers and corresponding layers grown at high temperature. In the Ga $3d$ spectra a new component…
Abstract 2‐Bromo‐4‐nitropyridine N ‐oxide is orthorhombic, space group Pbca , with eight molecules per unit cell of dimensions a = 5.979(1), b = 9.899(1), c = 23.249(5) Å. The Br ion is nearly coplanar with the pyridine ring, while the two oxygen atoms of the nitro group are displaced above and below the ring by (−0.2…
The proton paramagnetic relaxation enhancement (PRE) in an aqueous solution of nickel(II) is described in terms of electron spin relaxation caused by damped vibrational motions of Eg and T2g symmetry. The damped vibrations generate a transient zero-field splitting (ZFS), of variable amplitude and variable principal di…
This paper reports the synthesis of a new one-dimensional phase, NaNb 2 PS 10, which is found to be soluble in polar organic solvents such as N -methylformamide (NMF) or dimethylformamide (DMF). Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) studies have revealed that these covalent pol…
UV−vis spectra of 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (TCPP) have been studied in dilute (1.0 μM) aqueous solution at pH 7.0 as a function of added electrolytes, including phosphate buffer, methyl viologen dichloride (MV), and propyl viologen sulfonate (PVS). At concentrations ≤1.0 μM and pH ≥ 7.0, TCPP is c…
Crossing nanotubes were investigated using scanning tunneling microscopy (STM) and spectroscopy. From the analysis of the measured mechanical deformation of the nanotubes, the contact force between the nanotubes is estimated to be 1 nN. Spectroscopy measurements showed two effects on the electronic structure: (i) band…
A two-dimensional copper(II)–radical complex [Cu(NITmPy)2(N3)2]n (NITmPy = 2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) has been prepared and characterized by X-ray crystallography. The crystal structure consists of neutral polymeric sheets in which each copper atom is bridged by the oxygen and nitrog…
Silica polymerisation activation and structure templating using arginine-based surfactants led to bio-inspired multi-scale porous materials.
A novel molecular-based magnet of three-dimensional (3-D) cyanide-bridged bimetallic assembly, {[Cu(en)2]3[W(CN)8]2·H2O}∞ (1), where en = ethylenediamine, was synthesized and structurally characterized. The assembly has a three-dimensional network structure extended by three kinds of CuII–NC–WV–CN–CuII linkages with v…
The adsorption of N 2 on close-ended single-walled carbon nanotube bundles was studied at different temperatures ranging from 81 to 94 K. The isosteric heat of adsorption was obtained from the adsorption isotherm measurements, and the binding energy of N 2 was estimated from the isosteric heat of adsorption data in th…
Abstract (Sr 1− x Ca x )Bi 2 Ta 2 O 9 bismuth‐layered compounds with composition x = 0, 0.2, 0.4, 0.6. 0.8 and 1.0 were synthesized by the conventional solid‐state route. Phase formation and structural evaluation of both calcined powders and sintered pellets were investigated using x‐ray diffraction and micro‐Raman sp…
Five Pt−Sn/Vulcan carbon nanocomposites containing metal nanoclusters highly dispersed on a carbon powder support have been prepared using trans -PtCl(PEt 3 ) 2 (SnCl 3 ) as the source of metal. Thermal gravimetric analysis of the decomposition of this complex in air reveals a single-step loss of all nonmetallic eleme…
The magnetic properties of single-crystalline ${\mathrm{Nd}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ were studied with both macroscopic and microscopic probes. The magnetization shows large irreversibility behavior between zero-field-cooled and field-cooled data at low field, suggesting a phase separation driven b…
We present distribution coefficients and crystal purity data for systems containing two of the three near-isomorphic amino acids l -leucine (LEU), l -isoleucine (ILE), and l -valine (VAL) in aqueous solutions. The data validate our earlier observation that the extent of impurity incorporation in amino acid crystals is…
Abstract Colloidal gold particles (11.2 nm) were coated with platinum overlayers, resulting in bimetallic particles with 1–8 mol% Pt. These particles were characterized using electron microscopy, energy‐dispersive x‐ray spectroscopy and electrochemistry confirming the Au–Pt core‐shell structure. The UV–visible spectra…
Abstract Cleaning substrate surfaces and checking the effectiveness of the cleaning method are two very important aspects of reliable surface analysis. The absence of a cleaning process leading to an yttria‐stabilized zirconia (YSZ) surface that is free of contaminants and of unchanged structure has inspired us to inv…
Abstract Two binary alloys (Fe–0.5 wt.% Si and Fe–1.5 wt.% Mn) and a high silicon steel were used to investigate the thermochemical phenomena occurring at the sample free surface during simulation annealing cycles aimed to achieve a hot‐dip galvanizing‐compatible surface condition. The samples were annealed for 60 s a…
Methane activation is a crucial step in the conversion of methane to valuable oxygenated products. In heterogeneous catalysis, however, methane activation often leads to complete dissociation: If a catalyst can activate the first C–H bond in CH4, it can often break the remaining C–H bonds. In this study, using density…
A highly ordered multilayer film was formed by casting chloroform solutions of an ionic complex between a dimethyldioctadecylammonium (DODA) and a phosphomolybdate anion PMo12O403− (PMo12) on a glassy carbon electrode and solid substrates (CaF2, quartz, and borosilicate glass). A well-ordered lamellar superlattice str…
We discuss atomistic simulations of dislocation processes in copper based on effective medium theory interatomic potentials. Results on screw dislocation structures and processes are reviewed with particular focus on point defect mobilities and processes involving cross slip. For example, the stability of screw disloc…