Materials Literature
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Chiral-nematic liquid-crystal layers which have a short pitch, homeotropic boundary conditions, and bistable properties are investigated with respect to the temperature dependence of their field-induced cholesteric-nematic phase transition. Hereto the threshold field needed for the transition is studied as a function…
The low-temperature crystal structure of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF), C10H8S8, is similar to its high-temperature structure. The room-temperature central bond lengths of this molecule are often used as reference in empirical methods to estimate the charge carried by the (BEDT-TTF)xn+ cation…
An obligatory step in cellulose degradation by anaerobic bacteria is the adhesion of rile bacterium to the polysaccharide. In many anaerobic bacteria the adhesion protein, and the enzymes required for extensive polysaccharide hydrolysis, are organized into a complex and interesting structure called the cellulosome. Th…
Employing photoelectron emission microscopy (PEEM) as the spatially resolving technique, pattern formation during the catalytic reduction of NO with CO has been investigated on a microstructured Pt(100)/Ti/TiO2 surface in the 10−6 and 10−5 mbar range. The microstructured surface—initially created by a lithographic tec…
Recently, we used discrete off-lattice versions of the 3D Edwards model in conjunction with Monte Carlo simulations to study polymer brushes and diblock copolymer melts. Here we show by numerical simulation that the discrete Edwards model gives the scaling and corrections-to-scaling properties appropriate for a single…
Various copolyesteramides were prepared by melt compounding at 220 °C involving reaction of poly(styrene-co-maleic anhydride), SMA, with 6, 17, and 28 wt % maleic anhydride content, and 1-dodecanol, C12OH, in the presence of 2-undecyl-1,3-oxazoline, C11OXA. Copolymer architectures were examined by means of 1H NMR, FTI…
The behaviour of a single bubble in blood and in water is studied by using a non-Newtonian model of spherical bubble dynamics. This model considers the compressibility of the liquid surrounding the bubble, the shear-thinning characteristic of liquid viscosity, liquid density and surface tension. It was found that, for…
The effect of dc electric field and post-treatment on the dielectric properties of SrTiO3 single crystals are reported. Both the dielectric constant and the loss tan δ decrease after post-treatment in flowing oxygen environment for 26 h at 1100 °C. The possible physical mechanism is briefly discussed. The dielectric b…
We developed a spectral formalism to study the effective polarizability of a spheroidal particle lying over a substrate, including multipolar effects. With the help of the spectral representation, we can discuss the optical response in terms of the excitation of the multipolar modes of the system. As an example of app…
Surface modification of thin Gd films during hydrogen absorption has been investigated on the nanometer scale by scanning tunneling microscopy. Two different types of surface pattern appear that can be attributed to hydrogen-induced plastic deformation processes within the Gd film. Disklike islands are formed first du…
Titanium nitrides are important materials with many industrial applications. However, the structure and properties of nitrogen-rich compounds are not well established. Based on ab initio calculations, stochiometric titanium nitride compounds, $c\ensuremath{-}{\mathrm{Ti}}_{3}{\mathrm{N}}_{4}$ and $c\ensuremath{-}{\mat…
The solid state reaction between metalorganic chemical vapor deposition grown epitaxial ZnO films and the R-plane sapphire substrate after annealing at 1000 °C for various times in an O2/N2 atmosphere was studied in detail. Multiple epitaxial relationships between the reaction product (ZnAl2O4) and the reactants were…
The formation and structural properties of end-linked polymer networks were studied in the framework of the bond fluctuation model on a three-dimensional simple cubic lattice. Only excluded volume interactions were considered between repeat units (monomers and cross-links). Networks were created with a wide range of t…
A photobleaching method is used to measure the rotational dynamics of tetracene and rubrene in polystyrene, and to determine the lifetime of spatially heterogeneous dynamic domains in the polystyrene matrix. It is possible to selectively photobleach subsets of probe molecules in more mobile environments and to measure…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Organization of Au Nanoparticles Protected by 2,6-Bis(1'-(8-thiooctyl)benzimidazol-2-yl)pyridineToshiharu Teranishi, Masa-aki Haga, Yoichi Shiozawa, and Mikio MiyakeView Author Information School of Materials Science Japan Advanced Institute of Science and Technol…
1 H NMR, 13 C NMR, and EPR studies of a series of low-spin ( meso -tetraalkylporphyrinato)iron(III) complexes, [Fe(TRP)(L) 2 ]X where R = n Pr, c Pr, and i Pr and L represents axial ligands such as imidazoles, pyridines, and cyanide, have revealed that the ground-state electron configuration of [Fe(T n PrP)(L) 2 ]X an…
The electron-phonon interaction in low-dimensional tight-binding systems is discussed. A sheet of graphite, which is two-dimensional, and an armchair single-wall carbon nanotube (SWNT), which is quasi-one-dimensional, are taken as examples. For the modulated hopping the matrix elements for both systems are derived in…
We present experimental and theoretical results on the distribution of deformations experienced by a sliding charge density wave (CDW) in connection with the normal $\ensuremath{\rightleftharpoons}$collective current conversion process. High-resolution $(30--100 \ensuremath{\mu}\mathrm{m})$ x-ray measurements of the s…
The chemical reactions of the diamond surfaces with oxygen play important roles in the chemical-vapor deposition process, etching, and wear of the surface. In the present study, periodic density-functional calculations have been performed to clarify the oxidation mechanisms of the hydrogenated diamond (100) surfaces.…
We have measured the plasmon dispersion of diamond along the high-symmetry directions using electron energy-loss spectroscopy in transmission. We found the plasmon dispersion to be considerably anisotropic. A comparison of the experimental results to ab initio calculations that take local-field effects into account de…