Materials Literature
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Abstract The boundary between diagenesis and metamorphism most likely involves the change of illite into mica. Observations of this change can be made using decomposed X-ray diffraction (XRD) spectra of illitic clay mineral assemblages in pelitic sedimentary rocks. XRD analysis of the (003) diffraction peak of diagene…
The twisting ability of a novel series of bridged binaphthol derivatives with substituents of various lengths and chemical nature in the 6,6-positions, recently synthesized and used as dopants in nematic solvents, is investigated with the help of the model based upon surface- helicity tensors. Structures of the low en…
The packing of the chains in (T6G2T2G2)n conformation of the form IV of s-PP is revisited on the basis of packing energy and structure factor calculations. According to this analysis, an alternative mode of packing has been suggested. A monoclinic structural model, with the unit cell centered on the C face, is obtaine…
Small angle resonant x-ray scattering measurements were performed for Pb(Mg1/3Nb2/3)O3 (PMN) at the Pb and Nb absorption edges using synchrotron radiation. The results are not consistent with the current model of segregated nano-domains and pose a serious question on the mechanism of the relaxor ferroelectric behavior…
We present the results of a large-scale computer simulation of supercooled silica. We find that at high temperatures the diffusion constants show a non-Arrhenius temperature dependence, whereas at low temperature this dependence is compatible with an Arrhenius law. We demonstrate that at low temperatures the intermedi…
The methanol extract of the stem bark of Amphipterygium adstringens (Julianiaceae) showed a dose-dependent inhibitory effect on ethanol-induced gastric ulcers in rats. Fractionation of this extract, guided by gastroprotective activity in rats, led to four active fractions rich in triterpenoid compounds. These fraction…
Two phase transitions in ferroelectric crystals of pyridinium tetrafluoroborate ${[\mathrm{C}}_{5}{\mathrm{H}}_{6}{\mathrm{N}]}^{+}{\mathrm{BF}}_{4}^{\mathrm{\ensuremath{-}}}$ have been characterized by x-ray- and neutron-diffraction studies and measurements of permittivity, pyroeffect, and spontaneous polarization. A…
The dependence of domain evolution and polarization switching on thermal and electrical histories has been investigated for K 1+ ‐ion‐modified lead zirconate titanate (PZT) ceramics by using hot‐stage transmission electron microscopy and Sawyer—Tower polarization methods. In each case, the domains were very narrow, on…
YbAl specimens were prepared using a hot-pressing technique and the 3 Seebeck coefficient and electrical resistivity measured over the temperature range 150-700 K in order to assess their potential as thermoelectric materials. The preliminary results show that YbAl possesses an electrical power factor 3 double those o…
A combination of thermodynamic analyses and potentiodynamic polarization tests have been used to study the anodic behavior of Cu in strong solutions in the concentration range 1–10 M. The studies were supplemented by chemical analyses of surface films. It was found that concentration‐dependent changes in the activity…
Synthesis, characterization, and electrochemical investigations of lithium bis[5‐fluoro‐2‐olato‐1‐benzenesulfonato(2‐)‐O,O′] borate(1‐), a new salt for lithium‐ion cells in ethylene carbonate (EC)‐dimethylcarbonate (DMC) mixtures are presented. At platinum electrodes the anodic oxidation limit is about 4.6 V, in good…
Abstract The crystallization behavior of blow‐molded PET bottles, which helps determine the product's transparency, was investigated by DSC dynamic cooling experiments that simulated the cooling that occurs in the injection blow‐molding manufacturing process. Dynamic cooling crystallization of PET optimized the condit…
The issue of optimal catalyst distribution was studied experimentally for the ethylene epoxidation reaction network on a Ag/α-Al2O3catalyst in the presence of 1,2-dichloroethane (DCE). For a fixed amount of silver, the influence of location and width of the catalytic layer on the conversion of ethylene, and on the sel…
Toughening mechanisms occurring in PP/PA6 (70 vol.-%/30 vol.-%) blends containing various amounts of SEBS-g-MA have been studied by in situ straining in a high voltage electron microscope (HVEM). Variation of volume fraction of compatibilizer (SEBS-g-MA) with constant PA6 content and reactive processing conditions giv…
Surface-enhanced Raman spectroscopy (SERS) was utilized for the quantitative analysis of double-stranded (ds) DNA amplified by a polymerase chain reaction (PCR). 4?, 6-Diamidino-2-phenylindole dihydrochloride (DAPI), which intercalates into ds-DNA but does not form a complex with single-stranded (ss) DNA, was added to…
The influence of the pH of precipitation on the morphology and the nitrate retention of aluminas prepared from nitrate solutions has been investigated. pH control causes the BET surface area of γ-alumina to vary between 180 and 410 m 2 /g and determines the extent of microporosity within the aluminas. Particle sizes d…
Abstract For the development of technical applications of polymers from renewable resources, various biopolymers are being studied. In this paper, the opportunities for industrial proteins on this market are discussed e.g. for use in (technical) coatings, adhesives, surfactants and plastics. The use of protein modific…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTemplated Nucleation in a Dynamic Environment: Crystallization in Foam LamellaeBao-Dong Chen, Jan. J. Cilliers, Roger J. Davey, John Garside, and Edward T. WoodburnView Author Information Colloids, Crystals and Interfaces Group Department of Chemical Engineering UMIST,…
Synthetic gel and glass of illitic composition, natural kaolinite, and mixed-layer illite-smectite were used as starting materials for hydrothermal synthesis of ammonium illite. Ammonium illite was prepared from synthetic gel by hydrothermal treatment at 300°C. The onset of crystallization began within 3 h, and well-c…
2,2-Dibutyl-2-stanna-1,3-dioxacycloalkanes were prepared from dibutyltin oxide and 1,2-ethanediol, 1,3-propanediol or 1,4-butanediol. These tin heterocycles reacted stoichiometrically with double molar amounts of γ-thiobutyrolactone by a stepwise insertion. In contrast to γ-thiobutyrolactone an excess of γ-thiocaprola…