Materials Literature
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An infinite, one-dimensional chelating ligand [P3Se] is present in K3RuP5Se10 (depicted on the right), which was obtained by the reaction of ruthenium with a molten mixture of nominal stoichiometry K3P6Se26.5 at 490°C. K3RuP5Se10 is the first structurally characterized ruthenium chalcophosphate, and features very shor…
Reversible CC bond breaking/making as well as drastic change in color are induced upon electron transfer in the novel redox couples of hexaarylethanes 1 and bis(triarylmethyl) dications 22+. Their hysteretic redox behaviors result from the quite different geometries of 1 and 22+. Ar = p-Me2NC6H4, p-MeOC6H4.
The linear FeOFe bridge in μ-oxo tetraphenylporphyrin iron(III) dimer can be protonated without structural rehybridization at the O atom (the structure of the μ-hydroxo-bridged complex is depicted on the right). Antiferromagnetic coupling between the iron centers is greatly attenuated, and proton self-exchange is sl…
Resonant Raman and nuclear magnetic resonance spectroscopies from single gallium arsenide quantum dots are demonstrated. The nuclei were probed through changes in the optical spectra of the quantum dot exciton arising from exciton-nuclear interactions. This approach allowed the application of optical spectroscopy with…
We study the rate of activated motion over multiple barriers, in particular the correlated double-jump of an adatom diffusing on a missing-row reconstructed Platinum (110) surface. We develop a Transition Path Theory, showing that the activation energy is given by the minimum-energy trajectory which succeeds in the do…
Hexagonally structured, mesoporous platinum (see picture on the right) is obtained by reduction of platinum salts in lyotropic liquid-crystalline phases. The template can be removed from the nanostructured metal colloid without affecting its structure.
A novel method for fabricating inhomogeneous thin film optical interference filters is discussed. Glancing angle deposition (GLAD) and substrate motion are used to create a single material thin film with periodic index variation as a function of thickness. Filters fabricated with this technique promise to be much simp…
The sonoluminescence of ionic semiconductors were studied. The main attention is paid to threshold phenomena which accompany the light irradiation, namely --- point defect creation and nonlinear ultrasound wave attenuation. The model for description of processes under investigation which connects the sonoluminescence…
Polypyrrole (PPy)-poly(ether urethane) (PEU) composite films were prepared via the chemical polymerisation of pyrrole in a tetrahydrofuran solution of PEU containing copper(II) chloride and lithium perchlorate, and subsequent casting. The electrical conductivity of the composite film (weight ratio of pyrrole to PEU 1:…
The microstructure and resulting properties of manual metal arc super duplex weld metals deposited using three different filler metals and two heat inputs were investigated using various techniques. Analytical transmission electron microscopy, electron probe microanalysis, and scanning electron microscopy were used to…
Superresolution performance of a plano-convex lens made of absorbing glass is analyzed numerically. It was found that a reduction of the radius of the Airy disk depends solely on the center transmittance of the lens (a zero edge thickness is assumed) for any reasonable ratio of radius of curvature of the convex surfac…
In previous work, we have found for the first time that, besides the known conditions that influence the selectively reflected lightband from cholesteric liquid crystals. the physical sorptive properties of their supports also influence the reflected wavelengths. Thus, it was possible to differentiate metal oxides wit…
Abstract Breakdown and corona are investigated in clean and dust‐polluted rod‐rod air gaps varying gap length, rod radius and voltage polarity. It is shown that similar to previous results under impulse voltages, dust pollution can significantly reduce the DC breakdown voltage values of such gaps which depends upon el…
Recently the use of intumescents that interact with flame retardant fibres during the application of heat to form a novel char structure showing unusually high flame and heat resistance has been reported [1]. The interactive pyrolytic mecha nisms of both components creates a char-bonded structure that is unusually res…
The effect of sanchinoside Rg1 on generation of thrombosis and its mechanism was studied. Rg1 was shown to markedly inhibit experimental thrombosis formation induced by extra corporeal shunt between the carotid artery and jugular vein. After Rg1 infusion, the activity of t-PA was found to be increased, so did the perc…
Abstract In this work, the bimodal/film model is compared with the cell model based on a case study using polystyrene/styrene devolatilization. It shows improvements over the cell model: (1) it requires a lower initial number of bubbles, which is more physically realistic and (2) it takes into account the observation…
A computer simulation model for estimation of the interaction fields in fine particle systems has been developed. The method uses the experimental /spl delta/M/sub a/(H) plot, constructed from the Fourier description of the initial magnetization curve and the hysteresis loop, and the /spl delta/M(H) plot, obtained fro…
Blends of poly(vinyl chloride) (PVC) and acrylonitrile-chlorinated polyethylene-styrene (ACS) copolymer were prepared by melt blending. Miscibility, phase behavior, and thermal stability were studied using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA)…
An experimental study of flame-spreading behavior over thin Mg/PTFE/Mg (magnesium/poly-tetrafluoroethylene/magnesium) films with a thickness of 10/25/10 μm was conducted in both a pure argon and a 10% oxygen/90% argon environment. The objectives of this research was to determine the effect of initial chamber pressure,…
An earlier Monte-Carlo simulation of a cholesteric configuration of molecules is generalised in the present work allowing for full rotational degrees of freedom. The effect of temperature on pitch has been studied and the results are compared with the results obtained from mean field and plane rotator model simulation…