Materials Literature
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The combination of organic imidazoline-1-oxyl-3-oxide radicals as building blocks with metal ions can yield 1-D magnetic chains in various conformations, depending on the metal ion and the 2 substituent of the radicals.
Impregnation of a mesoporous xerogel or of MCM-41 with an organic solution of the heterometallic cluster [NEt4][Co3Ru(CO)12], followed by thermal treatment under an inert atmosphere, leads to highly dispersed magnetic nanoparticles under milder conditions than when conventional metal salts are used as precursors.
This article discusses the specific volume-measurement methods for semicrystalline polymers needed in order to obtain reliable data. Particularly, the effect of the cooling rate is analyzed, taking into account the thermal gradient in a cylindrical sample. Experimental results for a polypropylene form the basis for th…
We report the finding of an electron-paramagnetic-resonance (EPR) center, labeled O4, which contains cobalt on a site in the diamond lattice. O4 is observed at low temperatures $(<30 \mathrm{K})$ in high temperature and pressure synthetic diamonds grown with a cobalt containing metal-solvent catalyst after a high-t…
Monolithic mesoporous silica samples of ca. 2 × 2 × 1 mm in dimension with large surface areas (>900 m2 g−1) and pore volumes (>0.80 cm3 g−1) have been readily prepared via a sol–gel process in the presence of hydroxy-carboxylic acid compounds as non-surfactant templates, and their pore structure was observed directly…
A series of tung oil modified soybean alkyd emulsions are prepared by an inversion emulsified technique. In these alkyd resins, the tung oil contents are about 0, 12.5, and 25.0 wt % (based on the total oil). Using IGEPAL CO-630 as the surfactant, a very stable alkyd emulsion can be obtained. With the increase of the…
The dielectric constant ε′ and loss factor ε″ of deionized water and poly(vinyl alcohol) in aqueous solutions are measured in the frequency region 200 MHz to 20 GHz at four different temperatures (25, 35, 45 and 55 °C). Complex plane plots (ie ε″ vs ε′) are drawn to obtain the static dielectric constant ε0, high frequ…
For many applications, the total electron yield (TEY) η is assumed to be proportional to the product of the linear absorption coefficient and the photon energy. To test this model we measured the total electron yield of copper and gold at the (111) surface of single crystals in the photon energy range between 50 eV an…
Three different crystal polymorphs of CaCO3 (aragonite, vaterite and calcite) have been selectively induced by changing the time of addition of a radical initiator to a calcium carbonate solution containing sodium acrylate.
Zr-2.5Nb alloy pressure tubes for CANDU® reactors are nominally extruded at 815°C, cold-worked about 27%, and stress-relieved at 400°C for 24 h. The resulting structure consists of elongated α-Zr grains interspersed with a network of thin β-Zr filaments. Corrosion tests on unirradiated and preirradiated material have…
Our aim in this article is to discuss some questions related to the existence and uniqueness of solutions and on the existence of finite dimensional attractors for Cahn–Hilliard type equations. Compared to the classical Cahn–Hilliard equation, these models take into account the anisotropy of the material, the work of…
For clarification of the grain boundary energy and its structure of α-<110> symmetric tilt boundaries, the atomic structure was obtained by molecular dynamic method. The obtained results are summarized as follows.The grain boundary energy of <110> symmetric tilt boundary strongly depends on misorientation angle. There…
To prepare spray-dried powders of poly(D,L-lactic acid) (PLA) or poly-epsilon-caprolactone (P epsilonC) from colloidal suspensions containing indomethacin (IND) using benzyl benzoate (BnB), nanocapsules (NC) were prepared by nanoprecipitation. To select the best NC formulations, increasing drug concentrations were tes…
The utilization of sucrose by Clostridium acetobutylicum ATCC 824 was investigated. Sucrose was found to be transported via a phosphoenol-pyruvate (PEP)-dependent phosphotransferase system (PTS) and a metabolic pathway identical to that previously identified in C. beijerinckii, was established. The genes encoding the…
We studied the effects of different substrates on the development of the morphologies in thin film polymer blends in as-spun and annealed films. We have utilized thin films of blends of polystyrene and poly(methyl methacrylate) spun cast on Si, Au and Co surfaces, and produced quantitative composition maps with near e…
Amphiphilic and fluorescent covalently labelled core-shell nanoparticles based on poly(methyl methacrylate) (PMMA), were prepared by random copolymerisation of N-Vinyl carbazole (NVC) with MMA, initiated on polysaccharidic radicals, yielding diblock copolymers of either dextran-P(MMA-NVC) (Nanodex* particles), or hepa…
The synthesis and crystal structure of decanuclear Co and nonanuclear Ni cages are reported: the cages feature carboxylate and pyridonate ligands and demonstrate that inter-ligand repulsions can lead to novel structures.
Thermally induced structural transformations in hydrated MoO3 prepared by acidification of Na2MoO4 solution have been investigated dynamically by thermo-Raman spectroscopic techniques. The thermo-Raman spectra reveal that the structural evolution of as-synthesized hydrated MoO3 in air proceeds through an amorphous pha…
The phase–field model for binary alloys by Kim et al. is briefly introduced and the main difference in the definition of free energy density in interface region between the models by Kim et al. and by Wheeler et al. is di cussed. The governing equations for a dilute binary alloy are derived and the phase-field paramet…
Nucleation events of pitting corrosion for Fe‐Cr and Fe‐Cr‐Mo alloy series, enabling a single‐parameter variation in the alloy composition, was studied with microelectrochemistry. The main effect of Cr and Mo additions in Fe‐Cr alloys on the microtransient activity in NaCl solution is a decrease of the transient heigh…