Materials Literature
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The database LiqCryst 2.1 contains chemical structure and physical properties of about 70000 thermotropic liquid crystals, extracted from 14000 references. Program and data represent a scientific tool which allows statistical analysis of structure-property-relationships and the prediction of phase transition temperatu…
In order to investigate the effect of soaking temperature and annealing atmosphere on magnetic properties of the semi‐processed nonoriented electrical steel containing 0.4 % silicon, customer annealing was carried out at a temperature ranging from 730 to 950 and in different annealing atmospheres. As the soaking tempe…
Key words Skin microcirculation - galvanic stimulation - laser-Doppler-Flowmetry
Abstract A commercial Polystyrene (M w = 2.5 10 5 , MFI =14.80) was extruded repeatedly from one to eight times at 190 °C. The effects of extrusion process on physical and chemical properties of polystyrene were investigated using: ‐Average molecular weight —Izod Impact strength; —Thermal properties (TGA, DTA). The re…
Raman spectra of (CH3NH3)2SnCl6 were recorded in the temperature range 5–300 K. A continuous phase transition occurs at Tc=155 K. The fact that all the E modes of the CH3NH3+ ion and the SnCl62- ion remain degenerate in the low-temperature phase indicate that (CH3NH3)2SnCl6 still has a trigonal structure in the low-te…
Abstract The thermodynamical data of ammonium neodymium chlorides (NH 4 ) 2 NdCl 5 and NH 4 Nd 2 Cl 7 were derived by the determination of their decomposition equilibria by total pressure measurements. Moreover, solution calorimetry was applied. The enthalpies of formation of these phases were calculated from their h…
The potential energy surfaces for the insertion of a boron atom into CH4 and its consequent processes have been characterized employing MP2 and QCISD methods with the 6-311G(d,p) and 6-311 + + G(d,p) basis sets in order to locate the stationary points, followed by QCISD(T) calculations using a correlation-consistent a…
In this chapter pressure assisted sintering methods will be described. Attention will mainly be paid to sinter forging as a die-wall free uniaxial pressure sintering technique, where large creep strains are possible. Sinter forging is an effective tool to reduce sintering temperature and time and to obtain a nearly th…
A study is reported of the magnetic, electrical, and crystallographic properties of La 1− x Sr x MnO 3 (0.15⩽ x ⩽0.23) epitaxial films grown on single-crystal substrates of (001)ZrO 2 (Y 2 O 3 ) having the fluorite structure and (001)LaAlO 3 having the perovskite structure. It was found that films with close compositi…
A radiation grafted copolymer of polycarbonate (PC) and polystyrene (PS) was used as a compatibilizer of PC/PS melt blends. The compatibility and morphology of PC/PS/PC-g-PS blends were studied by differential scanning calorimetry and scanning electron microscopy. As a consequence of the addition of PC-g-PS, the compa…
Article Wasserfreie Präparationsmethode zum Nachweis von Chloriden bei der Hochtemperaturoxidation in chlorhaltigen Atmosphären / Water-free Methods of Preparation for the Analysis of Chlorides in the High Temperature Oxidation in Chlorine Containing Atmosheres was published on February 1, 1998 in the journal Practica…
Abstract Rubber articles derive most of their mechanical properties from the admixture of reinforcing fillers. Most commonly, carbon black is used as reinforcing filler. If silica is used instead, tyres made with such rubber compounds may exhibit a rolling resistance reduction by ca. 30%, which translates in substanti…
All articles of this category The title compound 3 was obtained in good yield by a two step synthesis starting from 2-formyl-5,10,15,20-tetraphenylporphyrin ( 1 ). Palladium-catalyzed coupling reactions of the alkyne moiety with iodoarenes proceed well, rendering 3 a suitable building block for the synthesis of photoa…
A new model of bubble dynamics is constructed in order to investigate single-bubble sonoluminescence (SBSL). In this model, the effects of non-equilibrium evaporation and condensation of water vapor at the bubble wall and of thermal conduction both inside and outside a bubble are taken into account. The most important…
CxN compounds were coated on two kind of graphites, natural graphite treated with 94%HN03 solution and the natural graphite without treatment, by chemical vapor deposition. XPS and Raman spectroscopy revealed that these materials were not mixtures of CxN and graphites, but CxN coated-graphites. As anodes of secondary…
The malate dehydrogenase (MDH) from Streptomyces aureofaciens was purified to homogeneity and its physical and biochemical properties were studied. Its amino-terminal sequence perfectly matched the amino-terminal sequence of the MDH from Streptomyces atratus whose biochemical characteristics have never been determined…
Abstract The complex dielectric permittivity of ionic plastic crystal KNO 2 was measured in the frequency range 20‐10 6 Hz and the temperature range 22‐300 K. A small step‐like anomaly of the static dielectric permittivity appeared at the rhombohedral (phase II) to monoclinic (phase III) transition ( T tr2 = 264. 1 K)…
A novel monomer with two N-phenylimide activating groups for the preparation of poly(aryl ether)s was investigated. A poly(aryl ether) was prepared by nucleophilic halide displacement from an aromatic dihalide monomer containing two N-phenylimide groups by sodium salts of bisphenol A. The monomers and the resulting po…
Positive temperature coefficient of resistance (PTCR) barium titanate is the active material in a ceramic sensor which employs piezoresistivity to detect changes in applied stress. High‐purity, chemically prepared barium titanate is donor‐doped with 0.30 at.% lanthanum, and <0.10 at.% of a transition‐metal counterd…
The technically important synthesis of alkyl polyglycosides from fatty alcohols and D-glucose was investigated on a laboratory scale. A new simple method to quantify the rate of this complex reaction by measuring the formation of water is described. The influence of the concentration and the kind of the sulfonic acids…