Materials Literature
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The reaction between salicylaldehyde, diethylenetriamine and lanthanide(III)(Ln3+) nitrates in refluxing methanol produced new acyclic dimeric Schiff-base compounds [{LnL7(NO3)}2](H2L7 is the 2 : 1 Schiff-base condensation product of salicylaldehyde and diethylenetriamine) in which the coupled Ln3+ ions are bridged by…
The dark‐field diffraction contrast of helical nanotubes (NTs) is shown to be asymmetric when an NT is tilted at appropriate angle with respect to the incident electron beam. This phenomenon was used for the chirality determination of multi‐shell NTs observed in MoS 2 layered compound. Both kinds of NT — helical and n…
The mechanisms of the molecular and dissociative adsorption of formic acid HCOOH on a ZnO(101̄0) surface were investigated by means of the ab initio molecular orbital method using a Zn 4 O 4 cluster embedded in an electrostatic field represented by 464 point charges at the crystal ZnO lattice positions. cis -Formic ac…
Stress, strain, and optical birefringence were measured for cross-linked natural rubber in compression and tension over a range of strains. The experimental data were compared to the constrained-junction theory (Flory, P. J.; Erman, B. Macromolecules 1982, 15, 800) and to the constrained-chain theory (Kloczkowski, A.;…
The phase behavior in ternary blends of polystyrene (PS), poly(methyl methacrylate) (PMMA), and poly(styrene- co -methyl methacrylate) has been determined as a function of sequence distribution at 150 °C. Two copolymers were investigated which have comparable compositions (48−50 mol % methyl methacrylate monomer units…
This paper examines the effects of hydration and plasticization on relaxation in cellulose acetate as revealed in the collated data from a number of techniques which include NMR, differential scanning calorimetry, dynamic mechanical thermal analysis and dielectric spectroscopy, the latter over an extended range of fre…
Hydrothermal synthesis of tetraborate, B 4 O 5 (OH) 4 2 -, -pillared hydrotalcites was investigated, and an efficient way of preparing them was found. The structures of the pillared materials were characterized using a combination of techniques such as powder X-ray diffraction, FT-IR, 11 B and 27 Al MAS NMR, DTA/TGA,…
Bicontinuous microemulsions made from oil, water, and surfactants were examined as substitutes for organic solvents in carbon−carbon bond-forming reactions. Conjugated additions of primary alkyl iodides 3a − c to 2-cyclohexen-1-one ( 4 ) to give 3-alkyl cyclohexanones 5a − c and cyclization of 2-(4-bromobutyl)-2-cyclo…
The first phthalocyanine derivative decorated with peripheral tetrathiafulvalene (TTF) units has been synthesized. The synthetic design strategy and the derivative's spectroscopic and electrochemical characterization are described. It is noted that the tendency of phthalocyanine units to assemble in solution is not pr…
Colloidal nanosheets of an exfoliated titanate start to be reassembled from a novel associated pair, accommodating an interlayer water cluster of > 100 Å thickness, to produce a restacked layer structure.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFormation of an Unstable Photodimer from 9-Anthracenecarboxylic Acid in the Solid StateYoshikatsu Ito and Haruo FujitaView Author Information Department of Synthetic Chemistry & Biological Chemistry, Faculty of Engineering, Kyoto University, Kyoto 606, Japan Cite this: J. Org.…
The polyethylene for the study was ultra-high molecular weight polyethylene (UHMW-PE) reactor powder extrusion drawn to a low draw ratio (DR) of ∼6 (first-stage draw). The structural change during the second-stage tensile draw of the extrudate has been studied above the static melting point by real-time wide-angle X-r…
The influence of a poly(styrene- graft -ethylene oxide) (P(S- g -EO)) copolymer on poly(2,6-dimethyl- p -phenylene oxide)/poly(methyl methacrylate) (PPO/PMMA) blends was studied by a number of different techniques in order to characterize the properties of the interphase. Scanning electron microscopy shows that the co…
The potentially toxic diatom Pseudonitzschia pungens f. multiseries was grown on different sources of nitrogen in batch cultures. Ammonium did not support growth at concentrations >200 μM, and even lowered the growth rate, when it was supplied in addition to growth-saturating nitrate concentrations. This seemed to be…
A microkinetic model was developed to explain the catalysis of the water−gas shift reaction by sulfided, alumina-supported molybdenum. In this model, the reaction takes place through a regenerative (reduction−oxidation) scheme wherein the catalyst surface is alternately oxidized by water and then reduced by carbon mon…
We have studied a double-bond bridged porphyrin dimer, trans -1,2-bis( meso -octaethylporphyrinyl)ethene (tbis OEP), which in solutions exhibits new spectral properties: (i) pronounced absorption bands in addition to the monomer ones are observed in the 480−500 and 600−900 nm regions; (ii) a broad-band fluorescence wi…
Within the extended-Hückel theory we present the influence of carbon 3s orbitals on the band structure of diamond. 3s orbitals are shown to account for the indirect band gap. The results of EHMO-ASED (atom superposition and electron delocalization) calculations agree well with orthogonalized plane-wave (OPW), pseudopo…
Article The Diatom Genus Thalassiosira (Bacillariophyta) in the Estuaries of the Schelde (Belgium/The Netherlands) and the Elbe (Germany) was published on January 1, 1996 in the journal Botanica Marina (volume 39, issue 1-6).
We investigated the isothermal crystallization of poly(ethylene terephthalate) by time-resolved small-angle X-ray scattering (SAXS) using synchrotron radiation. At the early stage, the SAXS intensity decreased monotonously with scattering angle (stage I). Then the SAXS profile showed a peak and the peak position progr…
Diffuse reflectance infrared (DRIFT) spectra have been obtained for carbon monoxide adsorbed with and without H 2 O on Pt/K-LTL zeolite. The complex spectra of CO linearly adsorbed on highly dispersed Pt have been analyzed by the combination of Fourier self-deconvolution and curve fitting. The linear-CO spectrum is co…