Materials Literature
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The chiroptical properties of a novel, optically active regioregular poly[3-(4-((R)-4-ethyl-2-oxazolin-2-yl)phenyl)thiophene] (poly-1) were investigated in mixtures of a good solvent, chloroform, and a variety of poor solvents using CD spectroscopy. Most poor solvents induced CD on poly-1 with similar Cotton effects,…
The ratio of the photoionization cross section of the transition to that of the O 1s electrons is determined as 2.16 ± 0.02 for the Al Kα X‐ray excitation. Application of this value is limited to oxidic Mg. Based on the above ratio, the photoionization cross section ratio of the Mg 2p electrons to the O 1s electrons,…
Electrospray time-of-flight mass spectrometry was used to study dilute (10(-3) M) solutions of tungstate, vanadate and perrhenate oxyanions under acidic and basic conditions. The electrospray mass spectra of tungstate and vanadate solutions indicate the presence of protonated monomeric oxyanions in basic solution (pH…
A new chiral ligand based on the condensation of 4-diethylaminosalicylaldehyde with (1R,2R)-(+)-1,2-diphenylethylenediamine (H2L2) is reported along with its nickel(II) complex. The diamagnetic NiL2 complex exhibits an efficiency 13 times that of urea in second harmonic generation at 1.9 µm. The structure–property rel…
The intercalation and polymerization of aniline within the pores of a natural tubular Cu2+-exchanged aluminosilicate clay known as halloysite is studied. The mesoscopic clay fibres have internal diameters of approximately 180 Å and lengths of up to 20 µm and can be deposited as films into which aniline is introduced f…
The regioselective synthesis of the new N,N′-dialkylated tetraazamacrocycle 1,11-bis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane, L1, has been achieved. The copper(II) complexes of L1 and of the isomeric ligand 1,8-bis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane, L2, have been isolated and their crystal…
The effect of gamma radiation on the thermal behavior and crystalline structure of low density polyethylene (LDPE) has been investigated using differential scanning calorimetry (DSC) and X-ray diffraction techniques (XRD). Gamma irradiation was carried out in atmospheric air to a maximum dose of 883 kGy. DSC results o…
In the investigation of the course of degradation and build-up reactions during the decomposition of the tert-butyl perbenzoate (TBPB) (at eight different concentrations) in isotactic polypropylene (iPP), it was found that, at the beginning of the peroxide decomposition at all investigated peroxide concentrations from…
Polyaniline films in nonaqueous media, mainly propylene carbonate and acetonitrile, are studied by using simultaneous potentio‐dynamic experiments with the electrochemical quartz crystal microbalance and electrochemical impedance spectroscopy. The role of ionic transport and solvent participation during redox reaction…
The electrical resistivity, magnetization, thermoelectric power, and specific heat have been studied on a series of Zn-doped polycrystalline samples ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Zn}}_{x}{\mathrm{Cr}}_{2}{\mathrm{S}}_{4}$ $(0<~x<~0.75)$ with a spinel structure over a wide range of composition and tem…
The double-layer capacitor was developed in the late 1960s by SOHIO Corporation, with further development continued by NEC and Matsushita in Japan. In 1978, a commercial product was introduced by Matsushita, the Panasonic Gold capacitor. This technological advancement has mainly been applied in computer memory backup…
The thermal decomposition in solution of
A comparative study of the infrared and Raman spectra of L-valine nitrate and L-leucine nitrate helps in determining the role of hydrogen bonds in these crystals. Both compounds have carboxylic and protonated amino groups in the cation while the nitrate ion forms the anion. The wavenumbers of several modes of vibratio…
In this letter an approach for fitting saturation characteristic and hysteresis using arctangent functions is presented. It has direct application to modeling transformers and electric machines. The approach is based on measurements of the magnetizing curve of the ferromagnetic material. The analytical form of the cha…
This paper describes the modeling of shell type distribution transformers with varying degrees of complexity. Results from several types of studies are reported and used to evaluate the effectiveness of FEA methods for resolving the forces exerted on the coils of a single-phase shell form transformer. The sensitivity…
Since silica has strong filler-filler interactions and adsorbs polar materials, a silica-filled rubber compound has a poor dispersion of the filler and poor cure characteristics. Improvement of the properties of silica-filled styrene-butadiene rubber (SBR) compounds was studied using acrylonitrile-butadiene rubber (NB…
Although graphitic carbon has been known and used as a biomaterial for a very long time, the excellent biocompatibility of diamond-like carbon (DLC) films has been addressed only in a few cases. We anticipate the combination of bioinert DLC films and surface-immobilized bioactive biomolecules with antithrombogenic pro…
Annealing of "thick" metal films deposited onto a smooth dielectric substrate leads to high-order self-organization of metal clusters on the film surface. This work presents the first experimental evidence that the "thick" gold film (TGF) may be specifically annealed to serve as a substrate for surface-enhanced fluore…
An investigation is made concerning the negatively charged environment, which the oxygen atoms of a glass provide for hosted metal ions, and the extent to which this changes on varying the glass composition. For Mn2+, d–d spectra show that the changes in the (average) oxygen electronic density of the glass are faithfu…
We describe electrochemical quartz crystal microbalance studies of polypyrrole films exposed to concentrated aqueous sodium tosylate solutions, in which the polymer is non-permselective in doped and undoped redox states at equilibrium. Then, sources and sinks of salt within the film open up new mechanistic possibiliti…