Materials Literature
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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…
Abstract Hydrotalcite-like layered double hydroxides (LDHs) of Mg(II) and Mn(III) were prepared by a co-precipitation/air oxidation method using MgCl2 and MnCl2 as starting materials. Syntheses were studied at different precipitation temperatures and variable starting Mg/Mn ratios. MgMn-LDH were obtained at a preparat…
Titanite is a common accessory mineral in silicocarbonatite from the Afrikanda alkaline-ultramafic complex, Kola Peninsula, Russia. In addition to large crystals (described elsewhere), this rock contains microscopic crystals and aggregates of titanite intimately associated with, or mantling, primary Ti minerals (perov…
Al–Pb ribbons containing 1 at.% Pb have been produced by melt-spinning and subsequently investigated by high-resolution transmission electron microscopy. It is shown that the lattice mismatch of about 22% between the nanometre-sized Pb inclusions and the surrounding Al matrix is accommodated by a periodic array of mis…
We have investigated microscopic magnetoelectronic phase separation and phase evolution with temperature in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$, for $x$ in the range zero to 0.3, using high-field $^{139}\mathrm{La}$ NMR. For $x\ensuremath{\geqslant}0.1$ three coexisting magnetic phase…
Summary In most European disposal concepts, one expects large amounts of dissolved hydrogen produced by the anoxic corrosion of iron inside a damaged container. At repository temperatures (<100 °C), dissolved hydrogen is quite inert and is not expected to contribute to the redox capacity of the deep groundwaters. I…
Single-chain and TRIS-assembled collagen mimetic peptide structures incorporating catechol groups were synthesized. When 1/3 equiv of Fe3+ was added to the single-chain compound in 50 mM CAPS buffer (pH 10), the 1:3 Fe3+-catechol complex that formed acted as an N-terminal scaffold to assemble the triple helix. When 1…
This paper reviews the structures and properties of 10 binary, ternary, and quaternary crystals within the equilibrium phase diagram of the SiO 2 –Y 2 O 3 –Si 3 N 4 system. They are binary compounds SiO 2 , Y 2 O 3 , Si 3 N 4 ; ternary compounds Si 2 N 2 O, Y 2 Si 2 O 7 , and YSi 2 O 5 ; and quaternary crystals Y 2 Si…
Abstract Semiconductor quantum dots (QD) are nanometer‐sized crystals with unique photochemical and photophysical properties that are not available from either isolated molecules or bulk solids. In comparison with organic dyes and fluorescent proteins, QD are emerging as a new class of fluorescent labels with improved…
The valence of rare earth ions in R2MgSi2O7:Eu, Dy (R = Ca, Sr) long-afterglow phosphors was studies by L3 edge X-ray absorption near-edge structure (XANES) spectroscopy and photoluminescence spectroscopy. The results suggest that Eu ions are in a divalent and trivalent mixed-valence state while Dy ions exist in the t…