Materials Literature
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Room-temperature single-crystal X-ray structure determinations of the 1 : 3 adducts of the trivalent lanthanoid perchlorates with 2,2':6',2"-terpyridine (‘tpy’) as crystallized from acetonitrile are recorded. The Ln = La complex is the only one of its structural type, being modelled as La(ClO4)3/tpy/MeCN/H2O (1 : 3 :…
Understanding the properties of complex systems requires the analysis of their energy landscape. Using simple models for the crystalline compounds MgF 2 and CaF 2 as example landscapes, we show that, in addition to the construction of tree-graph approximations of the landscape, the threshold algorithm can be employed…
The effect of sodium dodecyl benzenesulfonate (SDBS) surfactant micelles on the Ostwald ripening was investigated by several experiments and by computer simulation. The experimental ripening rates determined by dynamic light scattering were about 2 times higher than the one predicted by the Lifshitz−Slyozov−Wagner (LS…
Room-temperature single-crystal X-ray studies carried out on trivalent rare earth sulfate hydrates, Ln2(SO4)3. x H2O, crystallized at local ambience suggest the following arrays to be prevalent. For Ln = La, the nonahydrate is found, hexagonal P 63/ m , with conventional R on | F | 0·023 for N o 1159 ‘observed’ ( I &a…
Neutron powder diffraction has been used to examine the structural phase transitions in the perovskite-like NaTaO 3 , from room temperature to 933 K. The room temperature orthorhombic structure ( Pbnm , a = 5.4768(1), b = 5.5212(1), c = 7.7890(2)) transforms to orthorhombic Cmcm at around 700 K, then to tetragonal P 4…
The formation of transition-metal surface precipitates may occur during sorption to clay minerals under ambient soil conditions. This process may lead to significant long-term stabilization of the metal within the soil profile. However, the rates and mechanisms controlling surface precipitate formation are poorly unde…
New regulations for emission control require the improvement of the system composed by spark ignition internal combustion engine and three-way catalytic converter (TWC). In particular, an important problem is to minimize harmful emissions during the transient warm-up phase where the TWC is not working yet and, hence,…
The enantiomerically pure dendritic receptors with cleft-type recognition sites (dendroclefts) of generation zero ((−)-G0), one ((−)-G1), and two ((−)-G2) (Fig. 1) were prepared for the complexation of monosaccharides via H-bonding. They incorporate a rigid, optically active 9,9′-spirobi[9H-fluorene] core bearing 2,6-…
Egg yolk phosphatidylcholine liposomes modified with a copolymer of N-acryloylpyrrolidine and N-isopropylacrylamide having a lower critical solution temperature at ca. 40 degrees C were prepared and an effect of temperature on their interaction with CV1 cells was investigated. The unmodified liposomes were taken up by…
Macroscopic polarization, both of intrinsic and piezoelectric nature, is unusually strong in III-V nitrides, and the built in electric fields in the layers of nitride-based nanostructures, stemming from polarization changes at heterointerfaces, have a major impact on the properties of single and multiple quantum wells…
We study statistical properties of the energy spectra of two-dimensional quasiperiodic tight-binding models. The multifractal nature of the eigenstates of these models is corroborated by the scaling of the participation numbers with the systems size. Hence one might have expected `critical' or `intermediate' statistic…
The kinetics of degradation of methyl tert -butyl ether (MTBE) by ultrasonic irradiation in the presence of ozone as functions of applied frequencies and applied power are investigated. Experiments are performed over the frequency range of 205−1078 kHz. The higher overall reaction rates are observed at 358 and 618 kHz…
Two different approaches to the problem of carrier-induced ferromagnetism in the system of the disordered magnetic ions, one bases on self-consistent procedure for the exchange mean fields, other one bases on the RKKY interaction, used in present literature as the alternative approximations is analyzed. Our calculatio…
We have identified the pieces of the Fermi surface responsible for the long period oscillations of magnetic coupling across Cr and Cr$_{(1-x)}$V$_x$ alloy spacers in metallic multilayers. Analysing experiments and results of KKR-CPA calculations we find that the periods are determined by the extremal wave~vectors of t…
Results of a first-principles study of the Li impurity in GaN are presented. We find Li is a channel interstitial, with an onset for diffusion at T$\sim$ 600 K. Above this temperature, Li can transform to a Ga-substitutional acceptor by exothermic recombination with Ga vacancies. This process implies capture of at lea…
We review the theory of oscillatory magnetic coupling in Metallic Multilayers across alloy spacers. We illustrate the relationship between the frequencies of the oscillations and the extremal caliper vectors of the Fermi surface of the spacer by explicit calculations for Cu$_{(1-x)}$Ni$_x$, Cr$_{(1-x)}$V$_x$ and Cr$_{…
We study the response to shear of a one-dimensional monolayer embedded between two rigid plates, where the upper one is externally driven. The shear is shown to excite ``shearons'', which are collective modes of the embedded system with well defined spatial and temporal pattern, and which dominate the frictional prope…
<div class="section abstract"><div class="htmlview paragraph">Hydrogen has long been considered the fuel of the future. During this decade, significant resources have been invested in the development of advanced production, storage and utilization methods that hold the promise of moving society towards the…
Eine Kombination aus analytischen Methoden und Molecular-Modeling-Rechnungen ergibt ein detailliertes Bild der supramolekularen und mikroskopischen Struktur ausgefällter lipophiler Carotinoide. Die Nanopartikel sind aus einem Kern und einer Schale aufgebaut (siehe schematische Darstellung), wobei der Kern (120 nm) aus…
<div class="section abstract"><div class="htmlview paragraph">To achieve high thermal-to-electric energy conversion efficiency, it is desirable to operate thermoelectric generator devices over large temperature gradients and also to maximize the thermoelectric performance of the materials used to build the…