Materials Literature
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Single-crystal Mn3O4 nanorods with tetragonal structure have been successfully prepared by a chemical reaction route. Transmission electron microscopy (TEM) and high-resolution TEM studies prove that the single-crystal Mn3O4 nanorod is smooth and straight, and that the geometrical shape is structurally perfect. We inv…
The structure of a ⟨ 110 ⟩ 90° grain boundary in Au is investigated using high-resolution transmission electron microscopy (HRTEM) and atomistic simulation. It consists of coherent segments, exhibiting the extended 9R configuration described by Medlin et al. 10 Medlin, DL, Foiles, SM and Cohen, D. 2001. Acta mater., 4…
Picrophilus torridus has been shown to degrade glucose via a nonphosphorylative Entner-Doudoroff (ED) pathway. Here we report the characterization of a key enzyme of this pathway, glycerate kinase (2-phosphoglycerate forming). The enzyme was purified 5,100-fold to homogeneity. The 95 kDa homodimeric protein catalyzed…
Self-organization of nanoparticles into hierarchical assemblies is very important for the development of “bottom-up” approaches in nanotechnology. Porous silicon can be used as a substrate to prepare fractal-like magnetite nanoparticle assemblies, which add a new dimension to nanoscale spin electronics as each small p…
The strategy for seeding and supersaturation control can play a critical role in defining the purity and particle size distribution of crystal products. Previous research has demonstrated that operation of crystallizers at constant supersaturation by feedback control is attractive due to its simplicity and resistance…
Abstract 1,10‐Dioxydecamethylene doubly strapped Zn II ‐porphyrin S1 was prepared and treated with AgPF 6 to give meso – meso ‐linked porphyrin oligomers S n ( n = 2, 3, 4, 6, 8, and 12), which were converted to triply linked porphyrin tapes TS n by meso , meso′ ‐dibromo meso – meso ‐linked porphyrin arrays BS n and m…
Large-area aligned Mo nanowires have been grown on stainless steel substrates by high-temperature chemical vapor deposition with the use of Mo metal. The detailed physical and chemical growth processes regarding the formation of the nanowires have been investigated using mass spectroscopy, thermogravimetry, and differ…
The oxidation behaviors of LiH under a high purity argon atmosphere, an argon atmosphere with some O2 and H2O impurities, and ambient air at both room and high temperatures, are investigated using a variety of analytical instruments including X-ray diffractometry, thermogravimetry, mass spectrometry, scanning electron…
Although many formally FeV intermediates are known in the form of peroxidase compound I intermediates and their synthetic models, "true" d3 FeVO intermediates have remained elusive and hence a Holy Grail of sorts for many bioinorganic chemists. Very recently, Newcomb and co-workers provided transient absorption spectr…
The existence of threading dislocations in ferroelectric heterostructures has been frequently reported. However, their origin and impact on the ferroelectric properties are not sufficiently understood. PbZr0.2Ti0.8O3/SrRuO3 heterostructures were epitaxially grown by pulsed-laser deposition (PLD) onto vicinal SrTiO3(00…
Conformational properties of star-shaped polymer aggregates that carry attractive end groups, called telechelic star polymers, are investigated by simulation and analytical variational theory. We focus on the case of low telechelic star polymer functionalities, f < or = 5, a condition which allows aggregation of all a…
We report a simulated annealing study of the morphology of asymmetric diblock copolymer thin films confined between two homogeneous and identical surfaces. We have focused on copolymers that form a gyroidal morphology in the bulk. The morphological dependence of the confined films on the film thickness and the surface…
A significant deviation from the Debye model of rotational diffusion in the dynamics of orientational degrees of freedom in an equimolar mixture of ellipsoids of revolution and spheres is found to begin at a temperature at which the average inherent structure energy of the system starts falling with drop in temperatur…
The ability to integrate carbon nanotubes, especially single-walled carbon nanotubes, seamlessly onto silicon would expand their range of applications considerably. Though direct integration using chemical vapor deposition is the simplest method, the growth of single-walled carbon nanotubes on bare silicon and on ultr…
Instrumented indentation and tensile tests were performed on free standing Cu/Ag multilayer thin films with layer thicknesses in the range 0.85–900 nm. The effect of layer thickness can be described by a Hall–Petch relationship. The work-hardening rate in the tensile test depends on layer thickness, which indicates th…
A self-consistent tight-binding method and density functional theory were used to study structures and electronic properties of anatase nanoparticles. Full geometry optimization resulted in both surface relaxation and a slight overall contraction of the nanoparticles. Analyzing electronic properties using electron loc…
Konjugation erweitert: Azulenkondensierte Porphyrine (siehe Beispiel) werden durch Oxidation von meso-(4-Azulenyl)porphyrinen mit FeCl3 synthetisiert. Diese Strategie macht hoch π-konjugierte elektronische Systeme vom Porphyrintyp zugänglich, die vielversprechende Pigmente mit Zweiphotonenabsorption sind.
Abstract The photochromism of nitrate‐containing nickel–aluminum layered double hydroxides (NiAl‐NO 3 ‐LDHs) has been studied. Powder X‐ray diffraction (PXRD), FTIR, UV/Vis, XPS, ESR, EXAFS, and elemental analysis were used to investigate the structure, composition, and photochromic behavior of NiAl‐NO 3 ‐LDHs. A poss…
Accurate determination of chitin and protein contents in crustacean biomass and the intermediate products during the industrial isolation of chitin cannot be made directly from the total nitrogen content, unless the appropriate corrections are applied. This method, however, is affected by the presence of other nitroge…
Modifications of spin-splitting dispersion relations and density of states for electrons in non-symmetric heterostructures under in-plane magnetic field are studied within the envelope function formalism. Spin-orbit interactions, caused by both a slow potential and the heterojunction potentials (which are described by…