Materials Literature
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Amorphous ${\mathrm{SiC}}_{x}{\mathrm{N}}_{y}$ films with various compositions were deposited by ion-beam sputtering. The bonding characteristics, Young's modulus, and density of the films were investigated using x-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy, surface acoustic w…
Formalisms have been developed to express the time evolution of bimolecular processes taking place in fractal spaces. These ``stretched-second-order'' solutions are specifically applicable to radiation-induced electron-hole pairs and/or vacancy-interstitial pairs in insulating glasses. Like the analogous Kohlrausch-ty…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTExtremely Non-Planar Phthalocyanines with Saddle or Helical Conformation: Synthesis and Structural CharacterizationsNagao Kobayashi, Takamitsu Fukuda, Keiji Ueno, and Hiroshi OginoView Author Information Department of Chemistry, Graduate School of Science Tohoku Univer…
Zirconia is of great industrial importance as support for catalysts and as ion conductor. Especially when mechanical stability is needed in environments with varying temperature the tetragonal modification is superior, because of its high resistivity against physical shocks and thermal stresses. In this study density…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembled Arrays of Organic Nanotubes with Infinitely Long One-Dimensional H-Bond ChainsByung Hee Hong, Jin Yong Lee, Chi-Wan Lee, Jong Chan Kim, Sung Chul Bae, and Kwang S. KimView Author Information National Creative Research Initiative Center for Superfunctiona…
A series of nonempirical intermolecular potentials has been developed for the cyanuric chloride dimer, using the overlap model to determine the anisotropy of the repulsive wall around each atom. Calibration against intermolecular perturbation theory calculations enables the penetration and charge-transfer energy to be…
We present measured energy-loss spectra of nitrogen ions, which are scattered off a $(1\ifmmode\times\else\texttimes\fi{}2)$ missing row reconstructed Pt(110) single-crystal surface. The primary energy is varied from below 1 keV up to above 1 MeV, i.e., ${0.04v}_{0}<v<{2v}_{0}$ with ${v}_{0}$ the Bohr velocity.…
Abstract A study of butyl acrylate (BA) and vinyl acetate (VAc) solution homopolymerization and copolymerization in toluene was carried out. The conversion and copolymer composition were monitored using traditional techniques (gravimetry and 1 H‐NMR spectroscopy) and attenuated total reflectance‐Fourier transform IR (…
Abstract The thermal stability, crystallization behavior, and morphology of poly(vinyl butyral) (PVB) with differing compositions of vinyl alcohol and butyral units were investigated. It was found that the glass‐transition temperature of PVB decreases with increasing concentration of butyral units, mainly because of t…
We show that Herring's formula for the phonon-drag thermopower ${S}^{g}$ is equivalent to the standard Cantrell-Butcher (CB) formula for a two-dimensional electron (or hole) gas. The CB approach provides a rigorous theoretical framework which is remarkably successful in explaining the measured ${S}^{g}$ in two-dimensi…
This work for the first time reports X-ray crystals of the two mononuclear mercury(II) porphyrin complexes, i.e., a four-coordinate complex Hg(p-CN)4tpp (1) and a five-coordinate complex Hg(N-Me-tpp)Cl (2). Compound 1 is distorted square planar, whereas compound 2 is trigonal bipyramidal distorted square-based pyramid…
The improvements in the characterization of II--VI-compound-based solar cells and the recent experimental characterization of small clusters and nanoparticles make the study of small II--VI clusters very interesting. In this work, the ground states of small ${\mathrm{Zn}}_{i}{X}_{i}$ clusters are studied, $X=\mathrm{S…
Abstract Random copolymerizations of L ‐lactide with ( R )‐, ( S )‐, or rac ‐1‐methyltrimethylene carbonate with bis(pentamethylcyclopentadienyl) samarium‐methyl tetrahydrofuranate [(C 5 Me 5 ) 2 SmMe(THF)] as a novel initiator provided high molecular weight polymers with low polydispersities. Biodegradation of the re…
We report x-ray scattering studies of broad peaks located at (0.5 0 0)/(0 0.5 0)-type wave vectors in the paramagnetic insulating phases of ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ and ${\mathrm{Pr}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}.$ We interpret the scattering in terms of correlated polar…
A new type of mesoporous mixed transition metal oxide of Nb and Ta (NbTa-TIT-1) has been prepared through a two-step calcination, which consists of single crystal particles with wormhole mesoporous structure.
Abstract The multimodal differential scanning calorimetry melting endotherms observed for commercial linear low‐density polyethylenes are due to broad and multimodal short‐chain‐branching distributions. Multiple peaks, observed in melting endotherms of isothermally melt‐crystallized and compositionally homogeneous pol…
Electron magnetic resonance measurements were employed for studying the magnetic spin structure in bulk and crushed crystalline samples of doped ${\mathrm{La}}_{0.888}{\mathrm{Na}}_{0.113}{\mathrm{Mn}}_{0.997}{\mathrm{O}}_{3}$ and ${\mathrm{La}}_{0.833}{\mathrm{Sn}}_{0.126}{\mathrm{Mn}}_{0.997}{\mathrm{O}}_{3},$ and s…
A series of novel triphenylenes has been synthesised by a combination of palladium catalysed coupling, oxidative cyclisation, bromination and nucleophilic aromatic substitution. The new derivatives are designed to have structures which are intermediate between the known symmetrical materials hexakis(hexyloxy)triphenyl…
The dynamics of decay of the photoproducts of the two non equivalent molecules of N-(n-propyl) nitrospiropyrane in the crystalline state is significantly different due to the effect of the specific site where each of the molecules is located in the crystal latice.
The photophysical properties of Ti(2+)-doped NaCl and MgCl(2) at 15 K are compared. At this temperature both materials emit luminescence from their respective lowest excited states and from the (3)T(1g)(t(2g)e(g)) higher excited state. In Ti(2+):MgCl(2) the ligand field is significantly stronger than in Ti(2+):NaCl, l…