Materials Literature
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A influência de condições halomórficas, hidromórficas e sulfato redutoras na mineralogia da fração argila e na geoquímica de três solos de mangue foi estudada no manguezal do rio Iriri. A partir de uma transeção, foram escolhidos três perfis representativos dos solos de mangue da área nos quais foram descritas as cond…
Abstract The micro/nanostructural evolution of ultrahigh‐performance and textile (containing a dispersion of TiO 2 powder) polyamide 66 fibres during tensile loading and failure initiation was studied using Raman spectroscopy low‐wavenumber collective modes (∼100 cm −1 ) as a mechanical probe representative of the cry…
Abstract A one‐dimensional pattern‐forming state of a cholesteric liquid crystal (CLC) is used as a template for the self‐organization of ordered, spatially orientated, acetylene‐based semiconducting polymers. The polymers are formed by metathesis reaction with all chemical components contained in an ordinary electro‐…
The calcination of ammonium metavanadate was investigated using simultaneous thermogravimetric analysis (TGA) and differential scanning calorimetry techniques. The decomposition of ammonium metavanadate proceeded in three steps, and kinetic analysis was performed under nonisothermal conditions using an integral compos…
Abstract Nickel sulfide (NiS) hollow spheres have been successfully synthesized by γ‐irradiation, at room temperature, of an aqueous PMMA–CS 2 –ethanol solution that contains NiSO 4 ·6H 2 O. Electron microscopy results show that the diameter of the NiS hollow spheres and the thickness of the sphere shells are about 50…
Euhedral macrocrystals of Pt-Fe alloy from the Kondyor PGE placer, Khabarovskiy Kray, eastern Siberia, Russia, have a relatively constant composition of Pt 2.4-2.6 Fe, tin and antimony contents up to 0.3 wt.%, and an unusually low content of all PGE except Pt. The millimetric crystals contain inclusions of fluorapatit…
Abstract Development of several advanced miscroscopic and sprectroscopic techniques have played a key role in the development of characterization and parametric studies of polymer nanocomposites starting from the molecular level. The main issues affecting the production of good quality composites are fiber alignment,…
Abstract Several sandwich‐type polyoxometallates based on the trivacant [PW 9 O 34 ] 9− fragment with different Ni nuclearities were selected. Their stability and redox behaviour in aqueous media were evaluated by UV/Vis spectroscopy and cyclic voltammetry as a function of pH with the aim of finding the conditions und…
We present structural data on the RI alpha isoform of the cAMP-dependent protein kinase A that reveal, for the first time, a large scale conformational change within the RI alpha homodimer upon catalytic subunit binding. This result infers that the inhibition of catalytic subunit activity is not the result of a simple…
Calcium lactate (CaL2) crystal formation on the surface of cheese continues to be a widespread problem for the cheese industry despite decades of research. To prevent those crystals from forming, it is necessary to keep the concentration of CaL2 below saturation level. The limited data available on the solubility of C…
Abstract The morphologies of Ag particles can be controlled between distorted sphere and prism by employing microwave-promoted reductions of highly concentrated 0.1 M silver nitrate in aqueous solutions. We can selectively synthesize either sphere-Ag or prism-Ag particles by changing only an additive, i.e., either tri…
This study assesses the nickel content of as-received and retrieved stainless steel and NiTi archwires alloys. New and used brand-matched, composition-matched, and cross section-matched archwires were subjected to scanning electron microscopy and energy-dispersive electron probe microanalysis. Elemental analysis was p…
The stability of space charge in electrets such as polytetrafluoroethylene (PTFE), polyethylene terephthalate (PETP) and polypropylene (PP) under ultraviolet irradiation has been investigated using photostimulated discharge spectroscopy. While only weak discharge currents were observed in PTFE coated with semitranspar…
This study evaluated cryopreserved homografts (Group 1) and porcine heterografts decellularized with deoxicholic acid (Group 2), implanted in the right ventricular outflow tract of juvenile sheep. Two groups with four animals in each were used and all animals survived with good outcome. Animals were sacrificed 90 or m…
α‐Al 2 O 3 platelet powders were synthesized in molten Na 2 SO 4 flux. The size of α‐Al 2 O 3 platelets was significantly reduced when partially decomposed rather than pure Al 2 (SO 4 ) 3 was used as the source of Al 2 O 3 ; a further reduction in the platelet size was realized through additional seeding with nanosize…
This paper deals with the densification and phase transformation during pressureless sintering of Si 3 N 4 with LiYO 2 as the sintering additive. The dilatometric shrinkage data show that the first Li 2 O‐ rich liquid forms as low as 1250°C, resulting in a significant reduction of sintering temperature. On sintering a…
We report the synthesis of self-assembled carbon nanohelices on iron needles using microwave plasma assisted chemical vapor deposition. The catalytic growth can be explained by the vapor–liquid–solid theory. Their morphologies and microstructures are investigated by scanning electron microscopy, high-resolution transm…
A comprehensive kinetic study was performed to throw light on the formation mechanism of single walled carbon nanotubes (SWNTs) in chemical vapor deposition processes. SWNTs were synthesized by catalytic decomposition of methane or ethylene on supported transition metal catalysts. Kinetic curves (the amount of SWNT as…
Load transfer efficiency of nanoclay platelets in a polymer matrix wasinvestigated. Both tactoid nanocomposites and uniformly dispersed nanocompositeswere considered. The unit cell suitable for modeling the load transfer from thesurrounding matrix to nanoclay platelets using a shear lag model was discussed. Theload tr…
Triangular (111) and square-shaped (100) Pb(Zr,Ti)O3 single crystallites with lateral dimensions down to 50 nm and thickness of 20 nm have been grown using lithography-modulated self-assembly in an in situ sputter process. Epitaxial (111)-oriented Pt on a SrTiO3 single crystal served as the substrate. An epitaxial 2 n…