Materials Literature
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Dielectric nonlinearity is an important characteristic of ferroelectrics. Based on the characteristics of hysteresis loops and ε-E curves in ferroelectric materials, a model for dielectric nonlinearity of ferroelectrics is established. It is verified by the data of barium strontium titanate thin films.
Coupling drives the rotation: A theoretical study of proton-transfer dynamics of 5-methyltropolone (5MTR) has identified a long-range mechanical interaction. Methyl group rotation can be driven by proton transfer because of coupling between hyperconjugation and tautomerization within 5MTR (see HOMO–LUMO interaction).…
Besides inflammation, specific immune responses are seen also after implantation of biomaterials. The aim was to investigate the humoral response to bovine collagen type I following implantation of various polyester (Dacron) prostheses into pigs. In 24 randomized pigs, the infrarenal aorta was replaced with a segment…
We have investigated the effect of film thickness on the distribution of Mn atoms at various lattice sites in Ga1−xMnxAs thin films. We find that the growth surface acts as a sink facilitating the outdiffusion of Mn interstitials (MnI), and thus reducing its concentration in the film. The outdiffused MnI accumulate on…
Structural characteristics of CeO(2)-ZrO(2)/TiO(2) (CZ/T) and V(2)O(5)/CeO(2)-ZrO(2)/TiO(2) (V/CZ/T) mixed oxide catalysts have been investigated using X-ray diffraction (XRD), BET surface area, Raman spectroscopy (RS), and high-resolution transmission electron microscopy (HREM) techniques. The CeO(2)-ZrO(2) (1:1 mole…
The electronic structures of the molecule ${\mathrm{C}}_{50}{\mathrm{Cl}}_{10}$ are studied in the framework of density functional theory (DFT) with the Perdew-Burke-Ernzerhof (PBE) functional. The static polarizability $\ensuremath{\alpha}$ and second-order hyperpolarizability $\ensuremath{\gamma}$ are calculated by…
Der photoinduzierte Magnetismus in polymeren Analoga von „Preußisch Blau“ hat sich zu einem gut verstandenen Phänomen entwickelt, das auch bei höheren Temperaturen auftreten kann und Anwendung in Datenspeichergeräten finden könnte. Ein Beispiel ist der gezeigte Cyanid-verbrückte Einzelmolekül-Magnet (Mo gelb, C schwar…
Maintaining deep undercooling melts represents a formidable challenge when dealing with tungsten due to its high vapor pressure, its melting temperature (Tm=3695K), and the risk of contamination. Using electrostatic levitation, properties of liquid tungsten were measured above the melting temperature as well as in the…
Comprehensive low-temperature specific-heat data $C(T,H)$ of ${\mathrm{Na}}_{0.35}{\mathrm{CoO}}_{2}\ifmmode\cdot\else\textperiodcentered\fi{}1.3\phantom{\rule{0.3em}{0ex}}{\mathrm{H}}_{2}\mathrm{O}$ with temperature $T$ down to $0.6\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and the magnetic field $H$ up to $8\phantom{\ru…
This work presents the development of a wettability switching membrane device using the surface roughness effect. We designed and fabricated a roughness switchable membrane device, consisting of a thin poly(dimethylsiloxane) (PDMS) membrane bonded on the top of a rough PDMS substrate. A thin (less than 2 µm) PDMS memb…
A simple method has been developed to produce SERS-active metal surfaces. Six metal surfaces (cadmium, nickel, gold, iron, copper, and silver) have been prepared on an aluminum foil underlayment by chemical reduction and strong surface-enhanced Raman signals have been observed for pyridine species on these surfaces. T…
Recently we have reported on the growth of an exciting new class of hybrid nanostructured carbon materials, coupling nanosized diamond with single-walled carbon nanotubes. The inner structures were shown to be single-walled C nanotubes or bundles of single-walled nanotubes up to 15 μm long, and the outer deposit consi…
The selective reduction of NO with NH(3) catalyzed by isolated VO(x) species grafted onto TiO(2) (anatase) is studied by means of periodic density functional calculations. NH(3) is adsorbed molecularly by the bare support both as a Lewis-bonded complex at (101) 5-fold coordinated Ti sites, and as a H-bonded complex at…
Abstract Rheological, thermomechanical, and morphological properties of blends of two different epoxy resins with hydroxyl functionalized hyperbranched polymers have been studied. The hydroxyl functionalized hyperbranched polymers used in this work had different generation number and different number of terminal group…
Positron annihilation spectroscopy has been used to study the vacancy-type defects produced in films grown by metalorganic chemical vapor deposition on different sapphire orientations. Zn vacancies are the defects controlling the positron annihilation spectra at room temperature. Close to the interface (<500nm) the…
The synthesis of large-pore micelle-templated silica (MTS) materials as discrete spheres by pseudomorphic synthesis solves the double challenge: enlarging the pore size of MTS beyond the diameter of the micelles and controlling the morphology and the size of the particles. The pseudomorphic transformation of silica be…
Hollow polyhedra and cubes of nanostructured Cu(2)O particles have been synthesized by reduction of CuSO(4) with ascorbate acid in the solution phase. The nanostructures were obtained when the cetyltrimethylammonium (CTAB) concentration ranged from 0 to 0.03 M in the presence of NaOH. Structural characterizations, by…
We report on the correlation between the electrical behavior and valence band spectra of undoped and Al-doped ZnO films, obtained by using x-ray photoelectron spectroscopy. Although Al-doping can induce a conductivity increase of two orders of magnitude, we show that the gap persists and there is no semiconductor–meta…
Reliable diffusion coefficients, D, for the diffusion of perchlorate anions into polypyrrole films during polymeric oxidation were obtained from chronoamperometric results. Two different models were used to calculate D: the Cottrell equation and the electrochemically stimulated conformational relaxation (ESCR) model.…
CdS multipod-based structures, such as flowerlike microstructures, tetrapod-like microrods, and long branched nanowires, were selectively prepared by atmospheric pressure thermal evaporation of CdS nanoparticles without the use of a catalyst. The morphologies could be well controlled by simply adjusting the deposition…