Materials Literature
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Yttria–zirconia and ceria–zirconia mesoporous thin films adopt either a cubic or 2D hexagonal mesostructure (see picture) depending on the quantity of water employed during the post-processing of the films. The hexagonal films are thermally stable above 400 °C, while the cubic forms retain their integrity up to 700 °C…
The paper proposes a new digital algorithm for the implementation of the fixed frequency, adaptive hysteresis current control for voltage source inverters. The key features of the new algorithm are the minimization of the analog external circuitry, the capability to automatically compensate for the inverter dead-time…
The structural and magnetic properties of ZnFe 2 O 4 nanoparticles embedded in a nonmagnetic ZnO matrix are presented. X-ray diffractograms and transmission electron microscopy images showed that the resulting samples are composed of crystalline ferrite nanoparticles with average crystallite size ⟨ D ⟩ = 23.4 ± 0.9 nm…
Two new transition-metal tellurium oxy-chlorides of the general formula Ni_5(TeO_3)_4X_2 (X=Cl, Br) have been isolated during the investigation of the ternary phase diagram NiO-NiCl2-TeO2. They crystallize in the monoclinic system, space group C2/c, and for the case of Ni_5(TeO_3)_4Cl_2 the unit cell is a=19.5674(2) A…
We propose a new type of morphological instability in the diffusion-limited growth of faceted crystals from the vapor phase that can explain the formation of thin ice plates at temperatures near -15 C. The instability appears when the attachment kinetics for facet growth depends strongly on the morphology of the facet…
We evaluate the equation of state of the quasi-one-dimensional (1D) phase of C60 molecules in small carbon nanotubes, nicknamed ``peas in a pod''. The chemical potential and 1D pressure are evaluated as functions of the temperature and density, initially with the approximation of nearest neighbor interactions and clas…
The electronic structure of the vanadium dioxide VO_2 in the tetragonal R and two monocinic M_1 and M_2 structural modifications was calculated in frames of the local-density functional (LDA) approach and the LSDA + U formalism of correction for correlation effects. Based on the results of calculation, we argue in fav…
Hot gels get turned off: Gelation of the title molecules facilitate transfer of excitation energy exclusively from the self-assembled nanostructures (see scheme path a) to Rhodamine B and not from the single molecules (path b), thereby establishing the role of self-assembled gel nanostructures in light harvesting. The…
Abstract Moleküle mit einer großen Zahl gekoppelter paramagnetischer Zentren werden gegenwärtig intensiv erforscht. Man hofft auf Eigenschaften zu treffen, die zwischen denen isolierter Paramagnete und klassischer Magnete liegen, und damit einen eindeutigen Nachweis für das Auftreten von Größenquantisierungseffekten i…
This paper discusses the influence of nonsinusoidal flux-waveforms on the remagnetization losses in ferro- and ferrimagnetic materials of inductors, transformers and electrical machines used in power electronic applications. The nonsinusoidal changes of flux originate from driving these devices by nonsinusoidal voltag…
Molecules comprising a large number of coupled paramagnetic centers are attracting much interest because they may show properties which are intermediate between those of simple paramagnets and classical bulk magnets and provide unambiguous evidence of quantum size effects in magnets. To date, two cluster families, usu…
Phase behavior of a liquid crystalline chitin/acrylic acid liquid mixture was studied to fabricate a chitin-based composite with unique optical property. From a series of phase separation studies, we can evaluate the ternary phase diagram of a chitin microfibril, water, and acrylic acid monomer system. A suitable star…
The sol−gel technique has been used to prepare film-like iron/silica substrates for the large-scale growth of highly aligned carbon nanotubes. Here, we show that by using transmission electron microscopy (TEM) grids as shadow masks, the sol−gel technique can be readily adapted to prepare patterned film-like iron/silic…
Crystal structure prediction simulations were carried out to explore the solid state packing alternatives of two diastereomeric salts consisting of a chlorine-substituted cyclic phosphoric acid and the two enantiomers of ephedrine. The experimentally observed crystal structures were correctly simulated with an error o…
The stability of silicate MCM-41 in aqueous solutions for up to 12 days has been dramatically improved by silylation with hexamethyldisilazane (HMDS). Mesoporous molecular sieves including MCM-41 show promise for application as selective media for separations of large molecules such as proteins, which are important in…
The mechanical and physical properties of glycerol-plasticized wheat gluten films dried at different temperatures (20, 50, and 80 degrees C) and relative humidities (35 and 70% RH) were investigated. Dispersion of wheat gluten was prepared at pH 11 in aqueous solution. Films were obtained by casting the wheat gluten s…
We report molecular structures and temperature-dependent magnetic susceptibility data for several new metal complexes of heterospin triplet ground-state biradical ligands. The ligands are comprised of both nitronyl-nitroxide (NN) and semiquinone (SQ) spin carriers. Five compounds are five-coordinate M(II) complexes (M…
Highly conducting crystals based on single-component gold complexes with extended-TTF dithiolate ligands [Au(dmdt)(2)](0+) (1) and [Au(tmdt)(2)](0+) (2) were prepared (dmdt = dimethyltetrathiafulvalenedithiolate and tmdt = trimethylenetetrathiafulvalenedithiolate). On the basis of the synchrotron radiation powder diff…
Molecular dynamics (MD) simulations have been used to examine the structure and dynamics of a system containing an inorganic nanoparticle embedded in a polymer matrix. This paper represents a preliminary investigation into the feasibility of examining such relatively large systems using atomistic modeling techniques.…
Transverse NMR relaxation in a macroscopic sample is shown to be extremely sensitive to the structure of mesoscopic magnetic susceptibility variations. Such a sensitivity is proposed as a novel kind of contrast in the NMR measurements. For suspensions of arbitrary shaped paramagnetic objects, the transverse relaxation…