Materials Literature
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This paper describes seven new Gomphonema species from the Himalaya and provides information about their ecology with respect to water chemistry and habitat character. Diatoms were collected during surveys of over 200 Himalayan streams between 1993 and 2000. The geographical distribution, which covers a 1000 km east-w…
CdS nanoparticles with average radius Ro = 2.2 nm have been investigated by Raman scattering measurements. The nanoparticles, synthesized using aqueous solution precipitation, are small enough to show effects due to confinement. In the Raman spectra of CdS nanoparticles an asymmetric Raman line was observed. The domin…
Crystallisations are frequent process steps in the manufacture of active pharmaceutical ingredients (APIs). They are the primary means of intermediate or product formation and separation to achieve the desired purity and form. These unit operations are complex processes which are difficult to control due to the interl…
Abstract The thermal conductivity of ceramic powder packed beds was measured at temperatures below 100 °C for various powder sizes and compositions and under different gas atmospheres. Measurements at low pressures (down to 10 Pa) combined with a theoretical model allowed the elucidation of geometrical and thermal res…
The synthesis of new lipophilic meso-tetraarylporphyrins bearing cardanol is described; cardanol is both a dangerous pollutant and renewable, widely available, relatively low-cost natural material obtained as a byproduct of the cashew industry for the edible use of cashew kernel. Such compounds exhibited unusual chemi…
We have applied Raman spectroscopy to study the influence of thermal strain on the vibrational properties of polycrystalline Ba0.5Sr0.5TiO3 films. The films were grown by rf magnetron sputtering on Pt∕SiO2 surface using different host substrates: strontium titanate, sapphire, silicon, and vycor glass. These substrates…
Abstract State of the art is presented in the field of structure analysis of aperiodic crystals. Based on the superspace theory that recovers translation periodicity of aperiodic crystals in a (3 + d )-dimensional space, generalized crystallographic methods have been developed that work analogous to standard tools in…
The polytype structures of the three 1:1 dioctahedral phyllosilicates found in nature, kaolinite, dickite, and nacrite, have been investigated, using first-principle calculations within density functional theory. The crystal structures were calculated by being optimized with relaxation of all atomic positions. The cal…
Two recombinant collagen-like proteins consisting of cell adhesion domains derived from native type I collagen were designed and synthesized by a genetic engineering method. The cross-linking sequence, GPPGPCCGGG, derived from collagen III was used to promote triple helix formation through the disulfide bonds formed a…
Glucose, enzymatically released from pulp fiber sludge, was combined with inorganic salts and used as a growth medium for Alcaligenes eutrophus, a gram-negative strain producing poly(3-hydroxybutyrate) (PHB). By controlling the concentrations of the inorganic salts in the growth medium, almost 78% of the cell mass was…
Results concerning the compatibilization and the chemical-physical characterisation of blends of PET and polyolefins (HDPE, PP) obtained from postconsumer packaging materials are presented. The blend compatibilization was carried out by melt mixing and extrusion processes in the presence of a variety of polyolefins fu…
Abstract The wettability of a powder is important, especially in chemical and pharmaceutical technologies when considering the manufacturing process and the properties of the final product. However, contact angle methods for powders are problematic. The common measurement techniques are the sessile drop method and the…
The dominant relaxation mechanisms of SRS-active Ag(ν1) vibronic modes in CaMoO4 and PbMoO4 molecular ionic crystals were found to be the combination of two relaxation processes: the two-phonon splitting and the dephasing processes. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Abstract Reflection–absorption infrared spectroscopy was used to study the crystallization behavior of poly(ethylene terephthalate) (PET) ultrathin films. The crystallinity of ultrathin films was estimated by the fraction of trans conformers of PET. The isothermal and nonisothermal crystallization kinetics of ultrathi…
An air-jet How field model of the dual slot die in the melt blowing nonwoven process is proposed and solved numerically with the finite difference method. The effects of dual slot die design parameters on velocity and temperature distributions in the melt blowing flow field are investigated. The computation results of…
The octanickel(II) cluster 2b has been synthesized from the novel ferromagnetically coupled dinickel(II) metallacryptand 1b assembled from the m-phenylene-bis(oxamate) ligand. Complex 2b exhibits a dimer-of-tetramers structure, with two oxamate-bridged propeller-shaped tetranuclear units connected through three meta-s…
Abstract The biological synthesis of CaCO 3 crystals of variable morphology by challenging non‐calcareous microorganisms such as fungi with aqueous Ca 2+ ions has been described. Many fungi are known to produce reasonable amounts of CO 2 during growth. We show here that CO 2 and characteristic proteins released from t…
This paper reports the use of a natural fibre ‘isora’ as reinforcement for natural rubber. Isora is a bast fibre separated from the bark of the Helicteres isora plant by retting. The effect of different chemical treatments on the fibre properties and on the mechanical performance of short isora fibre reinforced natura…
Abstract Thermoplastic vulcanizates (TPVs) or dynamic vulcanizates are a special class of thermoplastic elastomers, produced by mixing and crosslinking of a rubber and a thermoplastic polymer simultaneously. In a previous study, it was demonstrated that the use of dicumyl peroxide in combination with triallyl cyanurat…
The ternary complex of Escherichia coli adenylate kinase (ECAK) with its substrates adenosine monophosphate (AMP) and Mg-ATP, which catalyzes the reversible transfer of a phosphoryl group between adenosine triphosphate (ATP) and AMP, was studied using molecular dynamics. The starting structure for the simulation was a…