Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorSpontaneous Crystallization of the Planar Zigzag Form of Syndiotactic Polypropylene at 0 °CTakahiko Nakaoki, Yasumasa Ohira, Hisao Hayashi, and Fumitaka HoriiView Author Information Department of Materials Chemistry, Faculty of Science…
Edited by Gunter Effenberg, MSI. Critical Assessment of phase diagram data for 46 systems containing: Diagrams of binary and pseudobinary systems, liquidus surfaces, and isothermal sections Complete thermodynamic description and thermodynamic data sets for the most refractory systems (Ti, Zr, Hf, W) - B-C Thermodynami…
The adsorption of C 10 E 8 onto a clean air−water interface and the desorption out of an overcrowded interface due to a sudden shrinkage of a pendant bubble in a quiescent surfactant solution are studied. Video-enhanced pendant bubble tensiometry is employed for the measurement of the relaxation in surface tension. Re…
Langmuir monolayers of polydimethylsiloxane-polystyrene (PDMS-PS) diblock copolymers on dioctyl phthalate (DOP) at 22 °C are employed as a model tethered chain system in theta solvent conditions. The segmental concentration profile of the tethered PS block is obtained over an order of magnitude in both surface density…
Tin-doped indium oxide (ITO) films were deposited by dc magnetron sputtering using oxide (ITO) or alloy (IT) targets. The ITO films sputter-deposited using Ar at total pressure ( P tot ) lower than 1.2 Pa showed polycrystalline structure, whereas entirely amorphous films were deposited at P tot higher than 1.4 Pa, ind…
Stabilization of the cubic perovskite phase was demonstrated in the oxide system at x ⩾ 0.03. Oxygen permeability of solid solutions was independent of chromium content at x = 0.01 − 0.05. It was found that reducing ceramic grain size dimensions resulted in decreasing thermal expansion electrical conductivity, and oxy…
We investigate the polarization properties of holographic gratings in side-chain azobenzene polyesters in which an anisotropic grating that is due to photoinduced linear and circular birefringence is recorded in the volume of the material and a relief grating appears on the surface. A theoretical model is proposed to…
We report on a photoelectron spectroscopic study of monovanadium oxides, VOx− (x=1–4), at four photon energies: 532, 355, 266, and 193 nm. Vibrationally resolved spectra are obtained for VO− at 532 and 355 nm detachment photon energies. Two new low-lying excited states are observed for VO at 5630 and 14 920 cm−1 above…
Computer simulations have been used for many years to understand experimental high‐resolution electron microscope images in a qualitative fashion, but the trend nowadays has been to attempt more quantitative image matching. This has led to the discovery that the contrast in experimental images is much less than in sim…
The atomic structure of the fivefold symmetric quasicrystal surface of icosahedral AlPdMn has been investigated by means of a dynamical low-energy-electron diffraction (LEED) analysis. Approximations were developed to make the structure of an aperiodic, quasicrystalline surface region accessible to LEED theory. A mix…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAsymmetric Redox-Active Dendrimers Containing a Ferrocene Subunit. Preparation, Characterization, and ElectrochemistryClaudia M. Cardona and Angel E. KaiferView Author Information Chemistry Department, University of Miami Coral Gables, Florida 33124-0431 Cite this: J.…
Electron−hole pairs created upon optical excitation of conjugated dendrimers (fractal antenna macromolecules) are shown to be localized within segments connected by benzene rings substituted at the meta-position. The absorption spectra of two families of dendrimers are analyzed using collective electronic normal modes…
Raman spectra of the layered compound, antimony triiodide are reported for samples at ambient temperature and at pressures up to 16 GPa. Changes in the number of observed peaks and their wavenumbers, relative intensities and spectral linewidths are discussed. Evidence for reversible crystallographic phase transitions…
Article Redetermination of the crystal structure of copper(I) tetrathiovanadate (sulvanite), CU3VS4 was published on April 1, 1998 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 213, issue 1-4).
This study describes the use of transmission electron holography to determine the mean inner potential of polystyrene. Spherical nanoparticles of amorphous polystyrene are studied so that the effect of specimen thickness on the phase shift of an incident electron wave can be separated from the intrinsic refractive pro…
Abstract Dissolved silver (Ag) in the presence of amorphous iron sulfide(FeS) rapidly equilibrates to ultra-trace levels ( ∼5 ng/L), which agrees with equilibrium calculations based on Ag2S solubility. This finding, along with the authors' discovery that crystalline Ag2S (acanthite) precipitates rapidly under supersat…
PbTiO3 nanocrystals were investigated by using Raman spectroscopy. The phonon modes in the nanocrystals exhibited an obvious frequency downshift as compared with bulk single crystals, and the mode frequencies in nanocrystalline PbTiO3 shifted up with annealing treatment. Size dependence of phonon modes in the nanocrys…
A lightning impulse causes substantial capacitive current in a water tree channel which, as a result of its small cross section, has relatively low conductance. Transient, nonlinear finite element computations with coupled thermal and electric fields for the geometry of a 15 kV XLPE dielectric cable indicate that an 8…
The ordering kinetics of cylindrical and spherical microdomains in a polystyrene-block-polyisoprene-block-polystyrene (SIS) copolymer were studied using synchrotron small-angle X-ray scattering (SAXS) and rheology upon quenching the sample from a disordered state to an ordered state having either spherical or cylindri…
Core and valence band spectra were obtained from a commercial PbO. The XPS data were collected with a VSW HA150 spectrometer equipped with a monochromatic Al Kα x-ray source and a multichannel detector. This report includes the Pb 4f, Pb 5d, Pb 4d, O 1s, C 1s, and valence band photoemission peaks. The XPS analysis sho…