Materials Literature
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The ν6 + ν12 and ν9 + ν12(E) vibrational combination bands of disilane (Si2H6) have been measured at high resolution and analysed. A few K-branches of the hot band associated with ν9 + ν12(E), originated from the torsional state v4 = 1, have also been observed and analysed. These observations give information on the e…
We have investigated luminescence spectra and their decay kinetics in potassium tantalate (KTaO 3 ) to reveal the nature and dynamics of the photoexcited states. The temperature dependence of the absorption spectra indicates electron–phonon coupling in KTaO 3 that is sufficiently strong to stabilize self-trapped excit…
Abstract The effect of calcination temperature on the electronic structure of gold catalyst was investigated in this paper. CO oxidation was employed as a test reaction to correlate the phase changes to the catalytic activity. The TPR, XPS and XRD characterization showed that the highly active Au/FeO x /Al 2 O 3 catal…
A low-cost pA-meter based on the precision integrator IVC102 is presented. By reducing the external noise contribution, the low number of implemented components allows the conditioning electronics to be installed closer to the sensor. The instrument shows an excellent linearity over the investigated range of input cur…
The mass‐spectrometric investigation of the gases evolved from fluorinated multi‐walled carbon nanotubes under heating was carried out. It was shown that in temperature interval from 20°C to 120°C the gases are composed predominantly of CO2, CO and H2O. Molecules of COF2 can be finding in gas phase of products of deco…
Macroporous, free-standing carbon thin films with a perfectly defined number of pore layers are shown to be obtainable by applying a chemical vapor infiltration process to a colloidal crystal template. Raman spectroscopy indicates that the deposited carbon is partially graphitizable, and the usefulness of these membra…
The large deformation mechanooptical behavior of amorphous films of PEN in the rubbery temperature exhibits three-regime behavior. Regime I corresponds to classical stress−optical behavior of amorphous materials where PEN remains completely amorphous during stretching. Oriented crystallization and long-range connected…
Four alkaloids of the phenethylamine derivatives have been isolated from the n-butanol fraction of the aerial parts of Stapelia hirsuta L. The structures of the isolated alkaloids were determined as N-acetyl hordenine (a new natural compound), hordenine, candicine and hordenine-1-O-beta-D-glucoside, in addition to lut…
High-aspect-ratio vertically aligned carbon nanofibers are functionally transferred from a growth substrate suitable for high-temperature processing to a substrate with electronic functionality. Nanofiber arrays are partially embedded within a polymer membrane that is then separated from the growth substrate and trans…
Summary There is no accepted methodology to correlate the effects of hydrate inhibitors on scale formation as there is for electrolytes. Similarly, the effect of hydrate inhibitor on scale inhibition with common inhibitors is not well known. In this paper, a semi-empirical approach is proposed to correlate the effect…
Tricritical point in charge-order systems and its criticality are studied for a microscopic model by using the mean-field approximation and exchange Monte Carlo method in the classical limit as well as by using the Hartree-Fock approximation for the quantum model. We study the extended Hubbard model and show that the…
Interaction of non‐rigid walls of double‐walled carbon nanotubes is studied within the Frenkel‐Kontorova model. It reveals a clearly defined commensurate‐incommensurate phase transition. Parameter which determines this phase is calculated for a set of double‐walled nanotubes with non‐chiral commensurate walls using ab…
The materials La2−xSrxNiO4+δ(x=0,0.1) with K2NiF4 structure have been studied in order to explore their potential use as cathodes for intermediate temperature solid oxide fuel cells. The introduction of Sr in the La2NiO4+δ lattice produces an enhancement of the electric conductivity but is accompanied by a decrease of…
The apportionment of electrons between iron and the porphyrinic macrocycle in complexes of octaethyloxophlorin (H3OEPO) has been a vexing problem. In particular, for (Py)2Fe(OEPO), which is an important intermediate in heme degradation, three resonance structures involving Fe(III), Fe(II), or Fe(I), respectively, have…
A theoretical analysis, based on density functional theory, has been carried out to study photoinduced processes within a recently experimentally characterized (Lainé, P. P.; Bedioui, F.; Loiseau, F.; Chiorboli, C.; Campagna, S. J. Am. Chem. Soc. 2006, http://dx.doi.org/10.1021/ja058357w.) series of Os(II) bis-tpy com…
Abstract Nanocomposites of polypropylene impact copolymer and organoclays were prepared using different compatibilizers (polypropylene‐ graft ‐(maleic anhydride) (PPMA), polyethylene‐ graft ‐(maleic anhydride) (PEMA) and their mixture) and varying percentages of clay (3 and 6%) in an attempt to obtain balanced mechani…
A one-dimensional lattice model based on the Landau-Ginzburg theory to study the intrinsic properties of a periodic superlattice with interfacial coupling is developed. The effects of thickness and interfacial coupling on the properties of a superlattice consisting of alternating ferroelectric and paraelectric constit…
Diamagnetic π complexes are formed in the reaction between [{CpCr(CO)3}2] and dithiadiazolyl dimers [S2N2CR]2 (R=substituted phenyl rings) in which the heterocycles are η2-coordinated to the metal in endo (depicted) or exo fashion. The isomers interconvert in solution at room temperature. These complexes are remarkabl…
We found that an appropriate additive ( l -Arg) induced the crystallization of dl -glutamic acid ( dl -Glu) as a mixture of enantiomerically pure crystals, even under conditions where racemic crystals (both enantiomers in the unit cell) normally crystallize from the pure system. In addition, the additive successfully…
Li 2 NH is a promising candidate for hydrogen storage. However, its performance for hydrogen absorption is strongly dependent on its preparation method. In this paper, we report that an ultrafast solid reaction between Li 3 N and LiNH 2 provides a new synthesis approach to an effective Li 2 NH material, which can reve…