Materials Literature
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Properties of a Nuclear-Spin-Polarization-Induced Quantum Ring (NSPI QR) are studied theoretically. In the proposed system a local nuclear spin polarization creates an effective hyperfine field which confines the electrons with the spins opposite to the hyperfine field to the regions of maximal nuclear spin polarizati…
We carry out finite-difference time-domain simulations, with a specially designed boundary condition, on pure evanescent waves interacting with a lossy left-handed material (LHM) slab. Our results provide the full-wave numerical evidence for the amplification of evanescent waves inside a LHM slab of finite absorption.…
Periodic (CASTEP and DMol 3 ) and cluster (Gaussian 98 and DMol 3 ) ab initio calculations were carried out to develop force field parameters for the system Ti−O−H to model TiO 2 −H 2 O interfaces. A force field was derived from previously existing force fields for bulk TiO 2 polymorphs (Matsui, M.; Akaogi, M. Mol. Si…
We report on a unique, very simple method of preparation of reactive membranes and nanotemplates with nanoscopic cylindrical channels on the surface of various inorganic and polymeric substrates. Well-ordered nanostructured thin polymer films have been fabricated from the supramolecular assembly of poly(styrene-block-…
Our research is concerned with the application of femtosecond time-resolved absorption techniques to the study of the photophysics of transition metal complexes. The focus is to understand the events that characterize the process of excited-state evolution from the time a photon is absorbed by a molecule to the format…
Abstract Acetyl tri‐ n ‐butyl citrate (ATBC) and poly(ethyleneglycol)s (PEGs) with different molecular weights (from 400 to 10000) were used in this study to plasticize poly(L‐lactic acid) (PLA). The thermal and mechanical properties of the plasticized polymer are reported. Both ATBC and PEG are effective in lowering…
Silicon nitride (SiN) films were prepared using 1,1,1,3,3,3-Hexamethyldisilazane (HMDS) instead of monosilane (SiH 4 ) by the cathode coupled plasma enhanced chemical vapor deposition (PE-CVD). As HMDS and NH 3 were used, SiN film prepared at RF power of 300 W shows high insulation performance, breakdown voltage of wh…
The doping effect of paramagnetic organic radical impurities ( p -CyDTV) on the organic spin–Peiels (SP) system of p -CyDOV (3-(4-cyanophenyl)-1,5-dimethyl-6-oxoverdazyl; the SP transition temperature T SP =15.0 K) was studied by the heat capacity measurement down to 0.1 K. At low temperatures below 1 K, quite a sharp…
Zincblende ZnMgCdS quaternary alloy layers were grown by molecular-beam epitaxy. The ZnMgCdS alloy lattice matched with GaAs and exhibited the band-gap energy of approximately 3 eV. Zn, Mg, and CdS were used as source materials. Cd was replaced by Zn or Mg, and the alloy composition was controlled when the growth temp…
Control of Birefringence Dispersion of Uniaxially Oriented Poly(2,6-dimethyl 1,4-phenylene oxide)/Atactic Polystyrene Blend Films by Changing the Stretching Parameters, Uchiyama, Akihiko, Yatabe, Toshiaki
Abstract For Abstract see ChemInform Abstract in Full Text.
Spin excitation in a nano-graphite ribbon with zigzag edges is investigated theoretically. Due to the strongly localized nature of the states near Fermi energy, the effective Hamiltonian for the low energy physics is given by Heisenberg Hamiltonian with the nearest neighbor exchange coupling. The action corresponding…
An empirical relaxation function suitable for describing the dynamics in disordered materials is presented. The function is a generalization of the stretched exponential function and based on power-law decays. The influence of parameters on the shape of the correlation function is discussed. Numerically transformed da…
Nanostrukturierte graphitartige Kohlenstoff-Filme lassen sich mithilfe einer einfachen Pyrolysemethode herstellen. Ohne Weiterbehandlung erhält man Filme, die nicht nur Wasser abweisen, sondern auch ätzende Flüssigkeiten wie saure oder basische Lösungen. Das Bild zeigt Wassertropfen mit pH-Werten von 1.07 (links) und…
The luminescence characteristics of Gd 3+ , Tb 3+ and Eu 3+ activated YAl 3 (BO 3 ) 4 phosphors in the vacuum ultraviolet (VUV) and ultraviolet (UV) regions of 130–300 nm are investigated. It is shown that the non activated YAl 3 (BO 3 ) 4 phosphor emits UV light under the VUV excitation, and the emission is related t…
The use of atomic force microscopy (AFM) to tailor and image ferroelectric domains in the submicron and nanometer ranges is gaining increasing attention. Many applications have been developed that make use of the superhigh electric field generated by the sharp AFM tip in a local area. In this article, we derive an exp…
We study the effect of shear on the aging dynamics of a colloidal suspension of synthetic clay particles. We find that a shear of amplitude $\ensuremath{\gamma}$ reduces the relaxation time measured just after the cessation of shear by a factor $\mathrm{exp}(\ensuremath{-}\ensuremath{\gamma}/{\ensuremath{\gamma}}_{c})…
The relationship between the memory retention properties and the leakage current density of Pt/YMnO3/Y2O3/Si capacitors was discussed. The leakage current of the ferroelectric YMnO3 layer was varied by temperature and by annealing the capacitors. It was found that the retention time became shorter upon increasing the…
Abstract A hybrid mesoporous material containing etenylene in a two-dimensional, hexagonally arranged mesoporous silicate framework with long-range symmetry is successfully synthesized. Quantitative analysis of the reactive etenylene groups within the silicate framework indicates that approximately 30% of the etenylen…
Interface structures in double-layer ferroelectrics comprising two distinct layers of different polarization properties, with bilinear interface coupling across the interface, are examined analytically within the framework of Landau-Ginzburg phenomenological theory. The structures are investigated for coupled layers w…