Materials Literature
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Upper Devonian rocks of the Iberian Pyrite Belt (IPB) in southwest Spain, comprising the Phyllite-Quartzite Group (PQ) and the lower part of the overlying Volcano-Sedimentary Complex (VSC), contain a diversity of terrestrial and marine palynomorphs (miospores and organic-walled microphytoplankton, respectively), which…
Abstract Both uncompatibilized and compatibilized blends based on polyamide 12 (PA12) and isotactic polypropylene (PP) were prepared in a Brabender Plastograph®. The compatibiliser used was maleic anhydride functionalized polypropylene (PP‐g‐MA). Phase morphology of the blends was inspected in scanning electron micros…
Dense tubular self‐supporting La 0.7 Ca 0.3 Fe 0.85 Co 0.15 O 3−δ perovskite membranes were prepared by thermoplastic extrusion. The rheological behavior of the ceramic mixture was studied. Non‐deformed tubes of 10 and 5 mm diameter and 0.3–0.8 mm wall thickness could be extruded. After sintering at 1100°C, the membra…
Structural equilibria of alkali silicate glasses and melts are investigated based on the Q n fractions ( n =number of bridging oxygen in SiO 4 tetrahedron) obtained from high‐temperature Raman spectra. A mathematical treatment of the entropy of mixing, Δ S mix , of structural groups of Q n is conducted and applied to…
Grain‐oriented ferroelectric ceramics are desirable for many applications, but developing a mass‐production method for such kinds of ceramics remains a significant challenge. In the current study, we report a convenient approach combining magnetic alignment and gelcasting to prepare grain‐oriented ceramics without app…
Area-selective growth of iridium dioxide (IrO2) nanorods has been demonstrated via metalorganic chemical vapor deposition (MOCVD) using precursor (methylcyclopentadienyl)(1,5-cyclooctadiene)Ir on a sapphire (012) or (100) substrate which consists of patterned SiO2 as the nongrowth surface. The optimal substrate temper…
Abstract Summary: Supramolecular interaction of fully methylated hyperbranched polyethylenimines (PEI) with a mesogen‐based carboxylic acid, 5‐( p ‐cyanobiphenoxy)pentanoic acid, results in the formation of supramolecular complexes exhibiting thermotropic liquid crystalline (LC) mesophases. In contrast to the common s…
Forsterite (Mg 2 SiO 4 ) ceramics were prepared using Mg(OH) 2 and SiO 2 as precursors, and the effect of powder characteristics of Mg(OH) 2 on calcination and sintering was investigated. The use of highly dispersed Mg(OH) 2 powder (HD powder) resulted in a lower calcination temperature. Forsterite powder of high homo…
In this paper, we report the growth of bamboo‐like silicon‐doped boron nitride nanotubes via catalyst‐assisted pyrolysis of a boron‐containing polymeric precursor. The morphologies and structures of the nanotubes were characterized using electron microscopy and Raman spectroscopy. Two types of nanotubes are observed,…
Enzymatic polymer synthesis is of considerable interest because of the synthetic advantages afforded by biological catalysts. Silicatein enzymes have shown broad synthetic utility for inorganic materials, and recombinant and native silicateins have been applied in the preparation of poly(L-lactide) (PLA). The picture…
Abstract Summary: Composite materials were prepared by compounding and hot‐pressing PP or MAPP and lignocellulosic fibers extracted from the rachis of Musa acuminate Colla var. Dwarf Cavendish banana tree. The fibers were used as raw filler or after a chemical treatment expected to remove most of the extractible compo…
Abstract Thermal degradation of poly(dimethylsilylene) homopolymer (PDMS) and poly(tetramethyldisilylene‐ co ‐styrene) copolymer (PTMDSS) was investigated by pyrolysis‐gas chromatography and thermogravimetry (TG). PDMS decomposes by depolymerization, producing linear and cyclic oligomeric products, whereas PTMDSS deco…
Abstract Oxamide‐based derivatives containing one or two oxamide moieties coupled to the 4‐ or 4,4′‐positions of cis ‐ and trans ‐stilbene have been synthesised. In order to modulate the solvent gelation tendencies, a series of derivatives with modified terminal functions were prepared from them. The trans ‐stilbene d…
Slab lenses formed from nonmagnetic anisotropic media are described. In the case of a uniaxial medium, the requirement is ${ϵ}_{xx}>0,{ϵ}_{zz}<0,z$ being the uniaxis direction, normal to the front and back optical surfaces of the lens. The properties of the lenses are similar to those of lenses made from a negat…
The evolution of antiferromagnetic and ferroelectric transitions for the series of multiferroic $R{\mathrm{Mn}}_{2}{\mathrm{O}}_{5}$ ($R=\mathrm{Sm}$, Eu, Gd, Tb, Dy, and Y) has been investigated by heat capacity measurements on single crystals. Both transition temperatures increase monotonically with the decreasing s…
Abstract Attapulgite (AT)‐reinforced poly(vinyl alcohol) (PVA) nanocomposite films were prepared by solution‐casting technique. The nonisothermal crystallization behaviors of PVA bulk and PVA/AT nanocomposites have been investigated by differential scanning calorimetry (DSC). It has been found that the uniformly dispe…
We derive a new model of structural relaxation in glass based on nonequilibrium statistical mechanics and the Stillinger model of inherent structures. Our model follows the evolution of a system from its equilibrium liquid state through an arbitrary cooling path and allows for the computation of macroscopic properties…
Two new tri(ethyleneglycol)-derivatized Mn(III) porphyrins were synthesized with the aim of increasing their bioavailability, and blood-circulating half-life. These are Mn(III) tetrakis(N-(1-(2-(2-(2-methoxyethoxy)ethoxy)ethyl)pyridinium-2-yl)porphyrin, MnTTEG-2-PyP5+ and Mn(III) tetrakis(N,N'-di(1-(2-(2-(2-methoxyeth…
Abstract Nanocomposites of poly(lactide) (PLA) and the PLA plasticized with diglycerine tetraacetate (PL‐710) and ethylene glycol oligomer containing organo‐modified montmorillonites (ODA‐M and PGS‐M) by the protonated ammonium cations of octadecylamine and poly(ethylene glycol) stearylamine were prepared by melt inte…
Stable free-standing liquid filaments formed by some layered mesophases of bent-core mesogens are unique structures. Some of their physical properties have been analyzed in recent studies, but their microscopic structure and conditions for stability have still been unclear. We explore details of filament shapes and su…