Materials Literature
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This is a short review of the physical ideas,algorithm for the calculation of the phase transition pressure and some results of a semi-classical theory of the behaviour of materials under high pressure proposed by P.Savic and R.Kasanin.It is base on the Coulomb interaction,supplemented by a microscopic selection rule…
A mechanism of the parity effect in the thermally assisted resonant tunneling is proposed in the view point of nonadiabatic transitions of thermally excited states. In this mechanism, alternating enhancement of the relaxation is naturally understood as a general property of quantum relaxation of uniaxial magnets at fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNiobium Compounds: Preparation, Characterization, and Application in Heterogeneous CatalysisIzabela Nowak and Maria ZiolekView Author Information A. Mickiewicz University, Faculty of Chemistry, Grunwaldzka 6, 60-780 Poznan, Poland Cite this: Chem. Rev. 1999, 99, 12, 3603–362…
Brewster angle microscopy, interfacial stress rheometry, and Π− A isotherm measurements are employed to characterize spread monolayers of two new cellulose derivatives, one containing octadecyl side chains, the other p -nitroaniline substituents. Similar monolayer phase behavior is found in both cases. At high surface…
The electronic and geometrical structures of the ground states and low-lying isomers of MnO 4 and MnO 4 - have been calculated as a function of spin-multiplicities by using the molecular orbital theory based on generalized gradient approximation to the density functional formalism. Total energies of isomers are used f…
A general design strategy for the synthesis of cystine-based peptide nanotubes is described. The design essentially involves closing of the polymethylene chains with cystine diOMe. The cystine-based nanotubes are constructed by the self-assembly of a simple cyclobisamide building block, a key structural feature of whi…
Static and MAS 207 Pb NMR spectra of a series of lead oxides, including the electronic materials PbTiO 3 (PT), PbZrO 3, Pb(Zr 0.53 Ti 0.47 )O 3, Pb(Mg 0.33 Nb 0.67 )O 3 (PMN), and 0.66PMN/0.34PT, have been measured. The chemical shift parameters (δ iso, δ aniso, and η) and the spin−lattice relaxation times have been d…
The full details of synthesis and characterization of diiron(III)-substituted γ-Keggin silicotungstate, [γ(1,2)-SiW 10 {Fe(OH 2 )} 2 O 38 ] 6 - (abbreviated as I ) were reported. This complex was synthesized by the reaction of the lacunary [γ-SiW 10 O 36 ] 8 - with Fe(NO 3 ) 3 in an acidic aqueous solution and isolate…
SERS spectra of phenazine adsorbed on silver colloids have been investigated. For ligand concentrations from 10 -4 to 10 -6 M, it was possible to obtain the adsorption isotherm of phenazine by absorption measurements in the UV−visible region. Filtration of the ligand/hydrosol systems through suitable filters containin…
Optical absorption spectra of InSe and InSe:Er single crystals were investigated just below and in the excitonic resonance energy region. The temperature dependence of the free exciton transition associated with the direct gap of InSe and InSe:Er were measured in the temperature range 10< T <340 K. The parameters desc…
Impulse breakdown of a point/plane gap in mixtures of SF 6 with selected buffer gases (air, CO 2 and N 2 ) has been studied. It has been found that the minimum impulse breakdown voltage of these SF 6 mixtures can be higher than or comparable with that of pure SF 6 . This finding is discussed in terms of the change of…
Chromium oxide pillared manganese oxide materials were prepared by intercalating layered manganese oxide with chromium hydroxyl acetate clusters under reflux condition. The as-synthesized materials were heated at 200 °C in flowing nitrogen for 1 h to result in chromium oxide pillared manganese oxides. X-ray diffractio…
Block copolymers consisting of two or three different polymer chains linked by covalent bonds form intricate domain structures that can be exploited in applications ranging from gas separation to optical communication. Recently, previously predicted gyroid structures, which consist of three or five separate three-dime…
Lanthanide(III) complexes have been prepared with [L 1 ] - [the tetradentate chelating ligand bis{3-(2-pyridyl)pyrazolyl}dihydroborate], [L 2 ] - [the tetradentate chelating ligand bis{3-(2-pyrazinyl)pyrazolyl}dihydroborate], [L 3 ] - [the hexadentate chelating ligand bis[3-{6‘-(2,2‘-bipyridyl)}pyrazol-1-yl]dihydrobor…
We offer an alternative explanation of the breakdown of Debye−Stokes−Einstein and Stokes−Einstein relations observed as enhanced translational diffusion compared with rotational diffusion of probe molecules in supercooled liquids and polymers close to the glass transition temperature. By showing that the breakdowns of…
A systematic investigation into the effects of deposition conditions on the electrochemical properties and nanostructure of high surface area (up to ∼460 m 2 cm - 3 ) mesoporous platinum films (H I -ePt) obtained by electroreduction of hexachloroplatinic acid (HCPA) from an hexagonal lyotropic liquid crystalline phase…
The photochemistry of the (7-methoxycoumarin-4-yl)methyl (MCM) carboxylates 3a − d, the mesylate 4, and the phosphates 5a − e has been examined under near physiological conditions in acetonitrile or methanol/aqueous HEPES buffer solution, respectively. Analysis of photoproducts as well as measurements of photochemical…
Models are presented which show that, for WDM systems, XPM and FWM in EDFAs can be far larger for tellurite than for silica (tens of dB larger for FWM), because tellurite is highly nonlinear. Experimental results for XPM are presented.
In this work we present the results of molecular dynamics simulations of polypropylene melts of different tacticities, based on a recently published molecular model. Volumetric properties of isotactic, syndiotactic, and atactic polypropylene exhibit no significant differences and are in good agreement with experimenta…
Kinetic aspects of the synthesis of (2-methacryloxy)ethyloxy functionalized poly( l -lactide) macromonomers using aluminum mono- and trialkoxides carrying this functionality are presented. The results show the living character of the ring-opening polymerization independently of the reaction temperature, but there are…