Materials Literature
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Abstract This review describes the chemistry of the formation and functionalization of molecularly templated mesoporous silica, as well as applications of functionalized mesoporous silica. The functionalization can be selectively placed on the internal or external surfaces, or even within the pore walls of mesoporous…
Abstract New families of extended tris-fused TTFs, in which aromatic rings are inserted, have been synthesized. Cyclic voltammetry and theoretical calculation of them indicate electronic structure of the furan and thiophene derivatives may be regarded as tris-fused TTFs, whereas the benzene derivative as a dimeric (2-…
Tests were conducted on several transformers rated at 100 kVA or less and on a power transformer rated 370 MVA in an effort to characterize the no-load losses and magnetizing resistance for transformers subjected to overexcitation and inrush current. Analysis of the results revealed that the magnetizing resistance cha…
Presents the first experimental results on PtSi/porous Si Schottky detectors. Si pores have been filled by Pt through electrodeposition. Under proper temperature treatment, Pt reacts with Si creating a PtSi layer that uniformly covers the walls of the pores. The excess unreacted Pt inside the pores is etched away leav…
Abstract Blends of very low density polyethylene (VLDPE) and high density polyethylene (HDPE) were prepared by melt extrusion. These blends exhibit a tendency to phase segregate when they are slow cooled from the melt. If they are cooled at increasingly faster rates, a finite population of co‐crystals can be isolated…
A simple model of phase separation is used to study the magnetoresistance of manganites in the nonmetallic state. It is assumed that the phase separation corresponds to the emergence of small ferromagnetic metallic droplets (ferrons) in a nonconducting antiferromagnetic or paramagnetic medium, with the metallic phase…
Abstract Previous researchers have numerically modelled the crevice corrosion of particular classes of metals and alloys. Applicable to passive metals immersed in an appropriate electrolyte, a new crevice corrosion model simulates the general passive crevice corrosion problem. Rapid approach of chemical equilibrium is…
Abstract Composite membranes consisting of microporous polyethylene films and the layers of electroconducting polymers have been elaborated. Polyethylene films were prepared in the process based on melt extrusion with subsequent annealing, uniaxial extension, and thermofixation. Permeability, the size distribution of…
An effective spin Hamiltonian is presented which describes the low-lying energy spectrum of antiferromagnetic molecular rings with high accuracy. It will be shown that for the particular case of the ferric wheels, quantum coherent phenomena are best discussed in terms of resonant quantum tunneling of the spin vector b…
[formula: see text] The influence of catalysts, acid chlorides, and solvents in the acylation of methyl 2-methyl-4H-thieno[3,2-b]pyrrole-5-carboxylate was studied. Conditions for the regioselective acylation processes were found. Thienopyrrole-based photochrome was synthesized for the first time.
We report on a photoinduced Faraday effect in an electrochemically synthesized cobalt-iron polycyanide film. When the Na0.36Co1.36[Fe(CN)6] ⋅4.7H2O film was irradiated with light from a Xe lamp, the Faraday rotation (FR) and Faraday ellipticity (FE) effects emerge suddenly over the 400–800 nm spectral change. The FR a…
A mononuclear [LaMnIIIOAc](ClO4)·0.5H2O [2(ClO4)·0.5H2O] complex with a new amino-containing pentadentate ligand LaH with a [N4O] coordination sphere has been obtained. Magnetic susceptibility measurements of 2(ClO4)·0.5H2O indicated a high spin electronic configuration for the MnIII ion. In cyclic voltammetry the rev…
We propose a protein crystal growth with stirring the solution, which is entirely different approach compared with the conventional method. The novel method, which we call the Floating And Stirring Technique (FAST), enables both growing crystals on an insoluble and very dense liquid without contacting the vessel and s…
In search of highly active nanoparticles for catalytic applications, flame aerosol technology turns out to be a promising method for its capacity to consistently produce highly pure nanoparticles. Starting with the production of simple oxides such as silica and titania in the forties, flame aerosol technology now faci…
Abstract The equilibrium and kinetics of proteins sorption and desorption by oppositely charged lightly crosslinked polyelectrolytes (#PE) were studied. The driving force of the sorption is provided by interpolyelectrolyte addition reaction (IPAR) between oppositely charged ionic groups of protein and #PE resulting in…
This work investigates the structure and stability of the pyrochlore solid solution Pb n Nb 2 O 5+ n using a combination of high‐resolution electron microscopy and electron diffraction. The microwave dielectric properties of the series 1.5 ≤ n ≤3.0 have been established, and the effect of the substitution of Ta 5+ for…
Abstract Two independent methods of crystal-size distribution analysis were compared: the Bertaut-Warren-Averbach XRD technique (MudMaster computer program) and high-resolution transmission electron microscopy (HRTEM). These techniques were used to measure thickness distributions of illite crystals (fundamental partic…
Abstract Light scattering has proved itself an efficient technique to determine particle diameters in heterogeneous dilute dispersions in the micrometer range. Extrusion of polymer blends is expected to give rise to very small particles, typically in the range from hundreds of nanometers to tens of micrometers. A ligh…
This paper presents an alternative approach aimed toward improvement of protective characteristics of gas-filled surge arresters (GFSA). Although so far GFSA with built-in radioactive sources proved to have superior protective characteristics, environmental concerns often challenge functional benefits. Experimental re…
Abstract Femtosecond fluorescence dynamics of trans ‐azobenzene in hexane have been investigated on excitation to the S 1 (n, π*) state at 432 nm using the up‐conversion technique. Two transient components were observed to represent the fast and the slow S 1 fluorescence dynamics in the wavelength range of 550–732 nm.…