Materials Literature
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Crystallization kinetics of stable and metastable nitric acid trihydrate (NAT) were investigated by time dependent X-ray powder diffraction (XRD) measurements. Kinetic conversion curves were evaluated adopting the Avrami model. The growth and morphology of the respective crystallites were monitored in situ on the cryo…
Silver and gold nanoparticles are very efficient catalysts for the dimerization of methyl-radicals in aqueous solutions. The rate constants for the reaction of methyl-radicals with the gold and silver nanoparticles were measured and found to be 3.7 x 10(8) M(-1) s(-1) and 1.4 x 10(9) M(-1) s(-1), respectively. The res…
Nickel–multiwalled carbon nanotube (MWCNT) composite films were fabricated by an electrodeposition technique, and their microstructure and thermal conductivity were characterized. Nickel–MWCNT composite films with a homogeneous dispersion of MWCNTs throughout the nickel matrix free of any significant voids were electr…
Магнитные сплавы с памятью формы: фазовые переходы и функциональные свойства, Бучельников В.Д., Васильев А.Н., Коледов В.В., Таскаев С.В., Ховайло В.В., Шавров В.Г.
A series of compounds based on the carboxyl-terminal CAAL sequence of PGGTase-I substrates was designed and synthesized. Using piperazin-2-one as a semi-rigid scaffold, we have introduced critical pharmacophores in a well-defined arrangement to mimic the CAAL sequence. High potency and exceptional selectivity were obt…
The synthesis and characterization of octavinylsilsesquioxane (OVS)-based nanocomposite dendrimers with luminescent and charge transport properties are reported. The nanocomposite dendrimers were prepared in high yield using mild Heck chemistry of mono-haloaromatic compounds with the peripheral vinylsilane groups of O…
Polypyrrole (PPy) was deposited into nanostructured porous silicon (PS) layers by the electropolymerization of the corresponding pyrrole monomer in an acetonitrile solution. The potential or current transients recorded during the polymerization process exhibit different characteristic stages: preferential nucleation o…
Strongly adherent polyaniline coatings were electrochemically synthesized on mild steel from an aqueous salicylate medium. These coatings were characterized by cyclic voltammetry, UV-visible absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy. The extent of the corr…
Single phases of ( , 0.05, 0.1, 0.2, 0.3, 0.95) samples were prepared by the thermal decomposition of the corresponding nitrates. Their photoluminescence properties were investigated UV and VUV excitation. Two broad bands were observed in the excitation spectra of monitored at 613 nm. One centered at about 157 nm was…
We have studied the adsorptions of aqueous solutions of three kinds of surfactants, anionic (sodium dodecylbenzenesulfonate, SDBS), cationic (dodecyl trimethylammonium bromide, DTB) and a non-ionic (Triton X-100, TX-100), by chromium-containing leather waste. The results indicated that the anionic surfactant can be si…
Publisher Summary This chapter reviews the structural properties of disordered packings of equally sized spheres. It discusses and uncovers several specific features that are relevant for the understanding of the structure of amorphous systems. The most important concepts and the principal findings can be schematicall…
Many of the natural fibers offer excellent properties suitable for various applications in apparel and non-apparel areas. Spider silk is a filamentous natural protein fiber produced by the spiders. Dragline silk produced by the spider offers superior properties than many of the natural and synthetic fibers. The natura…
Ternary systems of inorganic Pt salts and oxides, ionic liquids and concentrated sulfuric acid are effective at catalyzing the direct, selective oxidation of methane to methanol and appear to be more water tolerant than the Catalytica reaction.
Abstract Research in materials with dimensions of the order of nanometers has made a huge impact on the scientific community in the past decade. Chemists play an important role in this area of research as they endeavor to prepare pure, crystalline, surface-derivatized nanoparticles, which can be processed in potential…
In the last few years, some monomers such as phenols, anilines, pyridines, naphtols, Schiff bases and azo phenols have been subjected to oxidative polycondensation (OP) using NaOCl, H2 O2 and air O2 as the oxidants in aqueous alkaline or aqueous acidic medium. This resulted in oligomers with potential useful propertie…
The synthesis of four new analogues of motexafin gadolinium (MGd), a gadolinium(III) texaphyrin complex in clinical trials for its anticancer properties, is described. These new derivatives contain either 1,2-diaminobenzene or 2,3-diaminonaphthalene subunits as the source of the imine nitrogens and bear multiple 2-[2-…
Abstract A composite medium consisting of two sublattices of dielectric spherical particles of high permittivity and different radii embedded in a dielectric matrix of smaller permittivity are considered. It has been shown that such a composite medium reveals properties of an isotropic double negative media (DNG) in a…
Aluminium(III) porphyrin-carboxylate complexes, including a porphyrin pentamer, have been characterised by NMR spectroscopy, MALDI spectrometry and single crystal X-ray diffraction; these complexes can also be coordinated by a sixth, nitrogenous, ligand to the aluminium(III) centre.
A pi-pi scaffolding framework that was assembled as a one-dimensional chain structure comprising alternating Delta- and Lambda-iron(II) chiral building units, [Fe(II)(Delta)Fe(II)(Lambda)(ox)2(phen)2]n, reveals spontaneous magnetization that gives rise to pronounced hysteresis loops below 10 K.
Pure aluminum and magnesium cube samples were heated at a specific temperature for a given time after being polished by abrasive papers. The amorphous layer that formed on the sample surface was transformed into a crystallized oxide film during the heating and holding period. We discuss how this thermally-formed oxide…