Materials Literature
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A variety of 1: 1 charge-transfer (CT) crystals were prepared by using mainly dinitrobenzoic acids (as the acceptor) and carbazoles (as the donor). Most of the CT crystals prepared from 3,5-dinitrobenzoic acid (3) and a series of N-alkylcarbazoles (1a−1h) underwent photoredox reactions initiated by the excited nitro g…
Abstract The reaction between hematite and aluminum in presence of allumina as diluent activated by Ball Milling powder mixtures in different energetic conditions has been investigated. To this purpose, the powders at different milling times have been characterized by X-ray Diffraction and Mössbauer Spectroscopy. A se…
An ultrahigh-vacuum environmental chamber for surface X-ray diffraction on Station 9.4 at the Synchrotron Radiation Source, Daresbury Laboratory, is described. Film growth can be monitored by simultaneously recording the Auger signal and the X-ray intensity at a particular point in reciprocal space. Such in situ measu…
Photovoltaic phenomena in the structures por -Si/ p -Si were investigated by the pulsed photovoltage method in the time interval 100 ns-10 ms using irradiation with nanosecond laser pulses with photon energies 1.4, 2.0, 2.8, and 3.7 eV. The data obtained show that besides the barrier photovoltage, due to the separatio…
The adhesion properties of a thermoplastic olefin elastomer (TPO) after ozone exposure are studied with attenuated total reflection infrared spectroscopy (ATR), the lap shear test, and contact angle measurement. The ozone treatment is applied after the TPO is dip-coated with acrylic acid (AA) that is mixed with benzop…
Threshold photoemission spectroscopy is used to study the formation of a CsAu alloy during deposition of Cs on an Au substrate. It is shown that both the Cs surface layer and the CsAu near-surface alloy undergo indirect photoexcitation. It is found that the formation of a CsAu alloy is accompanied by a sharp rise (by…
Abstract The new compounds K 2 Cu 2 (SeO 3 ) 3 and K 2 Cu 3 (SeO 3 ) 4 were synthesized in the course of low-hydrothermal experiments on natrochalcite-type selenate representatives. The crystal structures were determined by direct methods from single-crystal X-ray diffraction data. K 2 Cu 2 (SeO 3 ) 3 : space group Cm…
From adjustment gears for sprinkler systems to surgical scissors, from latchbolts to parking gears, the winners of the Metal Powder Industries Federation's (MPIF) 1998 part-of-the-year design competition represent further market breakthroughs for powder metallurgy (PM). The winning parts show successful conversions fr…
A heterojunction based on semiconductors with a chain crystal structure p -TlSe- p -TlInSe 2 was obtained. Liquid-phase epitaxy from TlSe melt on the natural (110) cleavage surface of a TlInSe 2 crystal was used. The structure obtained is sensitive to light and hard radiation. Some photoelectric properties of the hete…
Abstract The electrical properties of liquid crystal cells were estimated using various kinds of polyimide(PI) films. It is clarified that the PI structures and its layer structures affects electrical properties of LC cells. Based on the result, we developed a new alignment layers that exhibit a high voltage holding r…
Soils in the upland areas of Malaysia are mostly weathered (Ultisols and Oxisols), having high aluminum (Al), but calcium (Ca) and/or magnesium (Mg) deficient. Magnesium limestone is available in large quantities in Malaysia and is frequently being used to alleviate acidity in the upland soils. This study aimed at ass…
Photothermal effects in nematic liquid crystals (NLCs) on a dye-doped polymer film are investigated using a crystal rotation method combined with a pump-probe technique. We consider both the temperature dependence of the refractive indices of the NLCs and reorientation of the NLC molecules due to a temperature rise at…
Optical and spectral investigations confirmed the availability of phase transitions in [C2H5NH3]2CuCl4 at T1 = 364 K, Th2 = 356 K, T3 = 232 K. It has been found that the empirical Urbach rule is fulfilled in all phases. It is shown, that in the high-temperature phases skeletal vibrations of the C–N–C group interact wi…
The ppc gene, which encodes phosphoenolpyruvate carboxylase (PEPC) of an extremely thermophilic bacterium, Rhodothermus obamensis, was directly sequenced by the thermal asymmetric interlaced (TAIL) PCR method. An ORF for a 937 amino acid polypeptide was found in the gene. The ppc gene had a high G+C content (66.2 mol%…
Megasonic cleaning is one of the most widely used wet-cleaning processes in the semiconductor, hard disk and flat panel display industries. Presented results involve different and new techniques for introducing the high frequency ultrasonic energy in the cleaning bath. The effects of power, temperature and time on the…
The precise nature of the polyanions formed by the action of hydrochloric acid on sodium molybdate solutions has been studied by pH and conductometric measurements involving glass electrode and conductometric titrations. The inflections and breaks in the titration curves indicate the formation of para-Mo7O24(6-) and o…
We measured the composition of the droplets of the aerosols generated by ultrasound from aqueous solutions containing various concentrations of Triton X-100 (an octylphenyl ethoxylate nonionic surfactant) and d -glucose, the latter being a reference nonsurfactant solute. To prevent the sonochemical decomposition of th…
The influence of simultaneous addition of calcium and zirconium on the ignition of magnesium was investigated. The ignition behaviour and ignition prevention of magnesium by calcium and zirconium were also clarified. As soon as pure magnesium melts in the air, it ignites. However, magnesium alloy containing 0.5 mass%…
Original gatherings of a number of freshwater or brackish naviculoid taxa were identified and examined primarily from collections held in the Natural History Museum, London. Morphological descriptions are provided for each, and type slides have been designated. Because original material of Navicula ambigua Ehrenberg d…
The electric, dielectric, and thermoelectric properties have been studied for a series of ZnxMg0.8–xNi0.2Fe2O4 ferrite samples (with x = 0, 0.2, 0.4, 0.6, and 0.8) prepared using the usual ceramic technique. The experimental results indicated that the real dielectric constant ε′ and dielectric loss factor tan δ decrea…