Materials Literature
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Nanometer silicon crystallites were fabricated by annealing a-Si:H/a-SiNx:H multiquantum well (MQW) structures with an excimer laser. The films were prepared by rf plasma enhanced chemical vapor deposition. Visible electroluminescence (EL) has been observed at room temperature from the crystallized samples that had Si…
We review the crystal structures, electrospray ionization mass spectra (ESI-MS) data and chiral HPLC data for the racemic and optically pure mononuclear AuL2 complexes, and for racemic [AuLI]n and optically pure [AgLII]n polymers (LI = thiomalate, LII = D-penicillamine). We postulate an equilibrium between polymeric,…
We describe a practical approach for computing the mobility matrix of a system of colloidal particles near a hard wall. The approach can be carried out in principle to arbitrary accuracy and number of particles. We make use of this approach to perform Stokesian dynamics computer simulations of colloidal suspensions in…
The present study deals with experiments carried out to assess the influence of the movement of equiaxed crystals on their growth kinetics. The principle of the experiments is based on the settling of crystals growing in melts of transparent alloy undercooled at constant temperature. Ammonium chloride-water mixtures h…
UV-Vis and lanthanide-induced 17O shift measurements on the complex [Eu(DOTA)]– (H4DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) have shown that the inner co-ordination sphere of the Ln3+ ion is not affected on protonation which suggests that the proton is attached to a non-co-ordinated oxygen atom…
This paper investigates the feasibility of using dynamic arc modeling of polluted insulators to characterize approaching flashover. The leakage current (LC) simulation results are compared to the measured leakage current, digitized during flashover test. It was observed that the harmonic content of the leakage current…
Rapid quenching of the title bis(aminoxyl) 1 in 2-methyltetrahydrofuran from ambient temperature to cryogenic temperatures (5 K or below) produces 1 in its singlet state, which slowly converts at low temperatures, with an S-shaped time-dependence, to the triplet ground state.
The phase-field model is applied to simulate microstructural evolution during isothermal dendritic growth of the δ-phase in undercooled Fe-C liquid. The parameters of phase-field equation are determined by a thin interface limit condition. Realistic dendritic structures at various temperatures and compositions of the…
Regioregular polythiophene copolymers 10a-d containing hexyl and 11-hydroxyundecyl side chains have been synthesised, by nickel-catalysed cross-coupling of well-defined Grignard intermediates. The hydroxy groups were protected during the polymerisation as tetrahydropyranyl ethers, and subsequently transformed into azi…
The structural elucidation of eleven new related polyoxypregnane glycosides, gymnepregosides G (1), H (2), I (3), J (4), K (5), L (6), M (7), N (8), O (9), P (10) and Q (11), from the roots of Gymnema alternifolium (Asclepiadaceae) was achieved by a detailed study of 1H- and 13C-NMR spectral data and chemical means. T…
Two series of novel spiropyrans and spirooxazines having a heteroaromatic pendant were synthesized using two convenient methods.Their photochromic behaviors were investigated with the aid of absorption spectral measurements.The compounds showed several features different from the parent spiro compounds, including an i…
Glasses whose compositions are expressed by the general formula: (50-x/2) BaO. (50-x/2) B 2 O 3 .xTiO 2 with x=4, 8 and 16 have been prepared and the structural modifications occurring in the glass network as consequence of the heat treatments performed near the glass transition temperature and their effect on the dev…
A comprehensive study of the molecule of methanesulfonic acid hydrazide (MSH) is presented. The X-ray structure shows that in the crystal two centrosymmetrically oriented MSH molecules are held together by N–H···N hydrogen bonding interactions. This feature is unprecedented for the known arylsulfonic hydrazide analogu…
A novel manganese vanadium oxide has been synthesized using the hydrothermal reaction of vanadium(V) pentoxide with manganese(II) sulfate with an organic templating cation at 165 °C. The (Mn2+)6(Mn3+)1–2/3z- (OH)3(VO4)3[(VO4)1–2z(V2O7)z] (z = 0.2) phase has a hexagonal tunnel structure and space group P63mc. The cell…
The reaction of ammonia with tris(methylamino)borane B(NHCH 3 ) 3 1 or with a B(NHCH 3 ) 3 derived polyborazine 2 led to completely different processes. Compound 1 reacted spontaneously with NH 3 to give mainly the borazine (CH 3 NH) 3 B 3 N 3 H 3 and subsequently a BN prepolymer which was not processible. A polymer 2…
The behavior of the magnetic components in high frequency switched power supplies depends significantly on the working frequency because of distributed magnetic and electrical field effects. Measurement equipment such as an impedance analyzer usually offers simple equivalent models that allow characterization of the f…
Specular reflectance infrared and electron spin resonance spectroscopies were employed for the analysis of the sites of Li(i), Cu(II) and Cd(II) cations fixed in the structure of montmorillonite from Jelšový Potok (Slovakia) upon heating for 24 h at 300 °C. Li(i) cations are trapped in two different sites: in the prev…
Quasicrystals are metallic alloys, often containing 60 to 70 atomic per cent AI. They typically exhibit crystallographically-forbidden symmetry, such as a fivefold rotational symmetry, illustrated in Fig. 1. Quasicrystals are reasonably abundant in a metallurgical context, since they can be formed by more than 100 com…
A new method for growing silicon crystals by using electromagnetic force to rotate the melt without crucible rotation has been developed. We call it electromagnetic Czochralski (EMCZ) growth. An electromagnetic force in the azimuthal direction is generated in the melt by the interaction between an electric current ( I…
The method for calculation of the mean and local magnetic characteristics of ferromagnetic metals at finite temperatures, developed by the author and co-workers in previous papers and based on using the real band structure and spin fluctuations, is applied to Fe, Co and Ni. The initial parameters of the calculation ar…