Materials Literature
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Abstract Films were formed by coating hydroxypropyl cellulose (HPC) or ethyl cellulose (EC) with different kinds of solvents at high coating speeds and thin coating thicknesses. These films were used as alignment layers for liquid crystals. Atomic force microscopy (AFM) and polarizing optical microscopy (POM) were use…
The thermoelectric figure of merit of a semiconductor p-n junction is calculated in terms of the diode theory taking account of the bipolar thermal conductivity. The thermoelectric figure of merit of a Bi 2 Te 3 diode is estimated and it is shown that the Ioffe criterion may be at the same level as the best modern the…
HDPE/iron powder composites have been characterized from the point of view of mechanical, thermal and electrical properties. Results for iron powder contents varying between 0 and 24 % by volume are presented. Generally, the composites show poorer mechanical properties as compared with the unfilled polymer. The densit…
Hydrophilic and stimuli-responsive submicronic latex particles based on polyalkyl(meth)acrylamide can be prepared owing to simple radical-initiated polymerizations in heterogeneous media using a water-soluble initiator and a crosslinker (methylenebisacrylamide). The paper aims at reviewing the synthesis and properties…
A strain-hardening mechanism is considered theoretically for crystals with large shear strains (γ=1–10). According to this mechanism, the emergence of the fourth and fifth stages in the strain-hardening curve for a crystal is associated with geometrically essential dislocations (GEDs) appearing as a result of accommod…
Excellent samples of lillianite, a rare Pb–Bi sulfosalt, have been found around a high-temperature fumarole at the La Fossa crater, Vulcano Island, Italy. The mineral is associated with cannizzarite and, subordinately, with galenobismutite and rarer sulfosalts, as well as sphalerite and selenian galena. Lillianite occ…
Garments are now becoming high class and automated. Using key face fabrics and interlining structure properties to predict the quality grade of fused composites has become an important subject in the pursuit of quick reaction of fabrics. The establishment of the ideal composite parameters for interlining and face fabr…
The properties of the ion-metal-plasma (IMP) deposited Ta, TaN and multistacked Ta/TaN between Cu and SiO 2 have been investigated in the Cu /barrier layer/ SiO 2 / Si structures using four-point probe, atomic force microscopy (AFM), X-ray diffraction (XRD), Rutherford back scattering (RBS), tunneling electron microsc…
A series of NaNbO3: x Mn single crystals had been obtained by flux method. Manganese oxide was introduced to obtain nominal Mn content within 10%mol. Real concentration of Mn dopant was determined as one order lower. It was concluded from valence band analysis that Mn ions built in niobium sublatice mainly. All the sa…
The illitization of a K-smectite in 0.5 molal KCl solution at 300°C and vapour saturation was studied to determine the nature of layers in interstratified run products formed in solutions supposed to favour the formation of illite layers. Solid products were analysed by X-ray diffraction (XRD), electron microprobe and…
Abstract SHS technology for immobilization of high-level radioactive wastes (HLWs) is based on combustion-assisted embedding of HLWs into chemically inert analogs of natural minerals used as preserving matrices of high chemical and radiation resistance. A pilot-scale production unit for SHS compaction of blocks up to…
„Äquatorialer“ Energietransfer: Der intramolekulare Energietransfer (EnT) in der Donor-Acceptor-Verbindung gezeigt ist von der Orientierung des Licht absorbierenden Substituenten abhängig; EnT wird nur ausgehend von der „peripher“ angeordneten Anthracen-Einheit beobachtet, nicht bei den beiden „axialen“.
Polymerization of p-(dimethylsilyl)phenylacetylene in toluene at 25 and 80°C using RhI(PPh3)3 as the catalyst afforded highly regio- and stereoregular poly(dimethylsilylene-1,4-phenylenevinylene)s (cis-3 a and trans-3 a) containing 98% cis- and 99% trans-vinylene moieties, respectively. Similarly, poly(butylmethylsily…
Template evolution from TPABr/silicalite powder was studied in a thermogravimetric analyzer as a function of heating rate and gas atmosphere to determine the maximum rate of weight loss and the temperature at which the rate of weight loss was a maximum. Through the application of TPD theory, the activation energies of…
Abstract A novel photochromic amorphous molecule (Spiro-BTE) based on bisthienylethene with a spirobifluorene linker has been synthesized. The relative high photochromic quantum yields were obtained for the Spiro-BTE and the switching stability was observed for more than 200 photochromic cycles. The introduction of th…
The microstructure of p-type (Bi,Sb)2Te3 and n-type Bi2(Te,Se)3 Peltier devices was investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, electron probe microanalysis and transmission electron microscopy, in the bulk and close to the metal–semiconductor interface. The substitution of Sb f…
A 32-year-old woman underwent SWL of a 4 x 6-mm calculus in the distal third of the right ureter, receiving 2100 shocks at a maximum intensity of 18 kV. Approximately 1 month later, it was discovered that she had been 10 weeks pregnant at the time of SWL. She chose to continue the pregnancy and delivered a normal infa…
Abstract New intermolecular H-bonded liquid crystalline complexes, viz., 2-(p-n-heptyloxybenzylidene imi-no)-5-chloro-pyridine:p-/z-alkoxybenzoic acid; (HICP:nABA) (where n denotes the alkoxy carbon num bers 3 to 10 and 12) exhibiting smectic-F (n = 12) and smectic-G phases have been synthesized and char acterized b…
When platinum materials are used for structural components in the high-temperature range, for example in the glass industry and in space technology, extremely high thermal, mechanical and chemical loadings arise. Apart from the solid solution hardened alloys, dispersion strengthened platinum materials have also been w…
In situ Raman spectroscopy was employed to investigate corrosion of a zirconium–niobium alloy in air-saturated water at a pressure of 15.5 MPa and temperatures ranging from 22 to 407 °C in an optically accessible flow cell. Monoclinic ZrO2 (m-ZrO2) was identified under all conditions after the coupon was heated to 255…