Materials Literature
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The electrochemical immobilization of a pH sensitive fluorescein derivative was achieved by preparing a fluorescein-substituted thiophene species, followed by its electropolymerization on a Pt electrode.
In previous works, authors have noted that corrosive wear was mainly determined by electrochemical dissolution, where the wear volume was equivalent to the corrosion volume calculated according to Faraday's law with the anodic current density obtained by potential pulse method. However, the corrosion volume has not ac…
This paper explores the basic mechanisms of fibre dehydration and the relationship between fibre structure and drying rate. Three fractions of water within the cell wall were found : bulk water located in large macropores, freezing bound water located in the micropores formed by the amorphous polymer network, and nonf…
An original device design including an aluminum–porous silicon light emitting diode connected with a photodetector by an alumina waveguide has been developed. Distinct photoconductivity and photovoltaic effects have been clearly revealed from current–voltage curves of the photodetector. The comparison of external ligh…
There is an increasing interest in developing Mg-based nanocrystalline hydrogen storage materials by mechanical alloying because Mg and its alloys have high storage capacity and their slow kinetics can be improved significantly by ball milling. However, their hydrides are still too stable for most practical uses. Impr…
The electron donor properties of the anti-thyroid drug carbimazole towards the soft Lewis acid I2 and the hard hydrogen-bond donor 4-fluorophenol are studied. Diiodine forms only a sulfur coordinated charge-transfer complex with carbimazole (formation constant ca. 1400 dm3 mol–1 in CCl4), while 4-fluorophenol forms bo…
The thermal expansion coefficients of various perovskite-type oxides have been estimated by re-evaluating the parameters used in the Ruffa's method. The Morse potential has been used to evaluate the thermal expansion coefficient assuming the Debye model for the frequency distribution of the Morse oscillator. The param…
Fifteen new steroidal glycosides were obtained from the roots of Metaplexis japonica M. (Asclepiadaceae). These glycosides were confirmed to have ramanone, 12-O-acetylramamone, pergularin, 12-O-acetylpergularin and deacylmetaplexigenin as the aglycone and 2, 6-dideoxyhexopyranoses as the sugar sequence by spectroscopi…
Chemical implantation of palladium(II) has been carried out under mild conditions by reacting trans-Pd(O 2 CNEt 2 ) 2 (NHEt 2 ) 2 with the silanol groups of amorphous silica, carbon dioxide and secondary amine being released in the process. The palladium-containing silica has been characterized and the coordination en…
The impact of nutrient supply ratios on the functional geometry of phytoplankton has been studied by means of competition experiments with phytoplankton communities from the Arabian Sea. Cell length and deviation from spherical shape of dominant competitors increased with Si:N ratios.Surface:volume ratios were minimal…
AbstractElectrochemical potentiodynamic measurements have shown that the critical pitting potential Epit of AISI 316L steel in aqueous solutions decreases linearly with increasing chloride ion concentration in the range 10−3–2·4M NaCl and with increasing temperature from 30 to 70°C. The critical chloride concentration…
Poly(tetrafluoroethylene) (PTFE) films were surface-modified by employing a reaction solution of benzophenone and sodium hydride in anhydrous dimethylformamide at a temperature of 150 degrees C for 12 h. Electron spectroscopy for chemical analysis (ESCA) showed defluorination, oxygen incorporation, and extensive unsat…
${\mathrm{CaGdAlO}}_{4}$ crystals doped with Ti ions were grown using the Czochralski technique in a reducing atmosphere in order to convert the valence of Ti to trivalence. The fluorescence of the ${}^{2}{E}^{2}{T}_{2}$ transition of ${\mathrm{Ti}}^{3+}$ in the crystals shows a broad band with a peak at 535 nm excite…
The syntheses of heterometallic compounds involving praseodymium, barium and copper ions by using 2,2′-thiodiethanol (H2tde) as the bridging ligand have been investigated. Three new polynuclear compounds, Pr2Cu4(tde)3(Htde)2(hfacac)4(µ6-O) 1, Ba2Cu2(Htde)2(hfacac)4 2 and Cu4(tde)2(hfacac)4 3 have been obtained and cha…
Chemical and structural effects in LuAlO3-Ce3+ single crystals grown by the Bridgman method were studied using spectral emission, x-ray, etching and optical techniques. The Ce concentration distribution was found to exhibit the normal freeze behavior with partition coefficient of 0,17. The expansion of the unit cell v…
A novel dimeric butenolide called glochidiolide was isolated from the leaves of Glochidion acuminatum. Its structure was elucidated by X-ray analysis.
Article Dehydration and Rehydration of Vermiculites: IV. Arrangements of Interlayer Components in the 1.43 nm and 1.38 nm Hydrates of Mg-Vermiculite was published on January 1, 1998 in the journal Zeitschrift für Physikalische Chemie (volume 207, issue 1-2).
Encapsulation of pyrrole in two kinds of zeolite Y (NaY and USY) with various concentrations of CuII ions has been attempted by a gas diffusion process, and the products have been characterized by means of thermoanalytic and spectroscopic methods. From the results, it was found that the progress of polymerization depe…
This paper demonstrates the effects of a laminated busbar on power electronics circuits, and compares its characteristics to those of other power distribution topologies. Included in the discussion are physical as well as electrical characteristics, along with the manufacturing implications that need to be considered.
Ground states for alkyl-substituted Schlenk hydrocarbon diradicals 1–4 in frozen 2-MeTHF or THF are determined at low temperatures by EPR spectroscopy (4–80 K) or SQUID magnetometry (2–80 K). Diradicals 1, 2, and 3 are triplet ground states. Diradical 4 is the singlet ground state with the singlet–triplet gap, ΔEST ≈…