Materials Literature
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O objetivo deste trabalho foi analisar a composição e \nestrutura das comunidades de algas diatomáceas (Bacillariophyceae) \ndos trechos superiores, médios e inferiores dos rios Pardo e \nPardinho, Bacia Hidrográfica do Rio Pardo, RS, Brasil. No \nperíodo de março a maio de 2003, foram realizadas colet…
Pestrea, Simona, Martin, Jean-Paul Saint (2002): La microflore de diatomées du Messinien de Gibellina (Sicile occidentale, Italie). Geodiversitas 24 (3): 585-610, DOI: 10.5281/zenodo.5376665
We show that the fabrication of one-dimensional Si nanostructures with tailored electronic structure and optical properties can be achieved by encapsulating magic metal-doped Si clusters in carbon nanotubes. This cannot only effectively change the properties of the so-called peapod, but also can keep the intrinsic str…
From the unique library of molybdenum-oxide based building blocks/fragments under reducing conditions in aqueous solution a huge variety of nanoobjects, allowing specific reactions at well-defined positions, can be generated. This enables us to perform a new type of nanochemistry. Examples include the well-known molec…
The half-doped manganite perovskite ${\mathrm{TbBaMn}}_{2}{\mathrm{O}}_{6}({\mathrm{Tb}}_{0.5}{\mathrm{Ba}}_{0.5}{\mathrm{MnO}}_{3})$ has been prepared by low-temperature oxygen intercalation into ${\mathrm{TbBaMn}}_{2}{\mathrm{O}}_{5}.$ Neutron powder diffraction shows that at 300 K, ${\mathrm{TbBaMn}}_{2}{\mathrm{O}…
The structural relaxation of a glass-forming simple liquid, 3-methylpentane, is studied by triplet state solvation dynamics as a function of the distance from the surface in porous silica. By bonding the optical probes to the pore surface, we observe interfacial dynamics which are 3 orders of magnitude slower compared…
We report the transport properties in the vortex liquid states induced by quantum fluctuations at low temperature in the layered organic superconductor $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{Cu}(\mathrm{NCS}{)}_{2}.$ A steep drop of the resistivity observed below about…
We demonstrate a simple method for the accurate characterization of the particle size distributions of colloidal particles with small polydispersities using a combination of dynamic light scattering and static light scattering. This method takes advantage of the variation in apparent radius observed using dynamic ligh…
Several mixtures obtained by ultrasonic agitation of colloidal silica with a sol solution containing tetraethoxysilane (TEOS) were used to form crack-free monoliths. The dry gels that were submitted to mercury porosimetry showed differences in behavior according to the proportion of silica colloid in the gel. For low…
Abstract Three types of low‐density polyethylene materials were investigated with respect to the influence of the molecular architecture on the mechanical and use properties of blown films. The materials were a branched polyethylene synthesized by free‐radical polymerization under high‐pressure (HP‐LDPE), a linear eth…
A series of novel halogenated alkoxy and aryloxy polyphosphazenes have been synthesized via macromolecular substitution reactions carried out on poly(dichlorophosphazene). These polymers showed good film-forming properties and tunability of refractive index. Moreover, several examples combined low glass transition tem…
This review details the combination of supramolecular chemistry and dendrimer chemistry. The use of supramolecular chemistry in the synthesis and modification of dendrimers, along with the application of dendrimers in supramolecular chemistry, is described. Many excellent examples exist within these areas; this review…
We report on the synthesis and characterization of a first iron(II) spin-crossover coordination polymer of formula [Fe(pyim) 2 (bpy)](ClO 4 ) 2 ·2C 2 H 5 OH, where pyim = 2-(2-pyridyl)imidazole and bpy = 4,4‘-bipyridine, with zigzag chain structure. The chains are linked by π stacking into a two-dimensional network. V…
A [001](110) small-angle grain boundary ${\mathrm{SrTiO}}_{3}$ was studied by electron-energy-loss spectroscopy (EELS) and high-resolution transmission electron microscopy. The $a〈110〉$ grain boundary dislocations were dissociated into two partial dislocations involving climb of the partials. From their separation an…
Paraelectric behavior due to a dynamic Jahn-Teller (JT) effect is reported for the manganese(III) spin-crossover complex [Mn(taa)] $[{\mathrm{H}}_{3}\mathrm{taa}=\mathrm{tris}(1\ensuremath{-}(2\ensuremath{-}\mathrm{azolyl})\ensuremath{-}2\ensuremath{-}\mathrm{azabuten}\ensuremath{-}4\ensuremath{-}\mathrm{yl})\mathrm{a…
Angle-resolved photoemission data from Al(001) taken with photon energies up to several hundred electron volts show an unexpected surface sensitivity at high energies. The surface state at the center of the surface Brillouin zone can be clearly observed up to photon energies higher than 700 eV. The surface to bulk int…
Optical extinction due to surface plasmon resonances of spherical and polyhedral carbon onions prepared from diamond nanoparticles has been studied. Extinction spectra for the onions dispersed in the distilled water were obtained experimentally by optical transmission spectroscopy. Theoretical considerations were give…
A randomly alkylated copolymer of N-isopropylacrylamide, methacrylic acid and N-vinyl-2-pyrrolidone was characterized with regard to its pH- and temperature-triggered conformational change. It was then complexed to liposomes to produce pH-responsive vesicles. Light scattering and differential scanning calorimetry expe…
Models for predicting the shape of organic crystals use geometrical rules and intermolecular interaction energies between the building blocks of the crystal but often ignore the environment in which the crystal grows. The resulting shapes predicted by these models may differ from the actual grown shapes since shape ca…
The boron trifluoride-catalyzed Rothemund condensation of triisopropylsilyl (TIPS) propynal 1 with 3,4-diethylpyrrole in dichloromethane, followed by oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) generates a mixture of products, including [15]triphyrin(1.1.3) H3, corrole H(3)4, porphyrin H(2)2, [24]pe…