Materials Literature
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The photodynamic activities of novel asymmetrically meso-substituted cationic porphyrins, 5,10-di(4-methylphenyl)-15,20-di(4-trimethylammoniumphenyl)porphyrin iodide 1 and 5-(4-trifluorophenyl)-10,15,20-tris(4-trimethylammoniumphenyl)porphyrin iodide 2 and its metal complex with Pd(II) 3, have been investigated in bot…
El servicio de alcantarillado de Cajicá no responde a un proyecto de ingeniería pensado hacía el futuro, sino, más bien, a \nsoluciones coyunturales de las comunidades urbana y rurales, y, por tanto, pensado para beneficiar una población relativamente pequeña (menos de 10.000 habitantes), sin tener en cuenta que,…
Linear arrays of ZnO nanoparticles have been successfully prepared by a simple sol–gel condensation reaction involving chemical modifiers, followed by drying (80 °C) and calcination (500 °C). The calcined material (nano-array ZnO) is composed of approximately spherical nanoparticles of average diameter 21 ± 3 nm, self…
K6Cd4Sn3Se13 forms in superheated water and has a polar open-framework structure that is based on an octahedral topological motif. It forms from the polymerization of a single [Cd4Sn3Se13]6− cluster which formally derives from a [Cd4Sn4Se17]10−via elimination of one [SnSe4]4− anion. K6Cd4Sn3Se13 exhibits facile ion-ex…
Sulfur-cured unfilled natural rubber (NR) was devulcanized in supercritical CO2 (scCO2) by using diphenyl disulfide (DD) as a devulcanizing reagent. The product was fractionated into sol and gel components. The fraction of sol component that contains reusable linear polymer increased with the increase in CO2 pressure,…
Effect of pass strain (Δε) on grain refinement was studied in multidirectional forging (MDF) of a coarse-grained 7475 Al alloy at 490°C under a strain rate of 3 × 10−4 s−1. Samples of rectangular shape were deformed up to accumulated strains of around 6 with subsequent changes in loading direction 90° from pass to pas…
Various organic moieties are homogeneously introduced in high quantities into mesostructured porous silica films through a general co-condensation process, which influences the self-assembly mechanism, depending on the physico-chemical properties of each function.
An anode-supported solid oxide fuel cell (SOFC) with lanthanum-doped ceria (LDC) and strontium and magnesium doped lanthanum gallate (LSGM) bilayer electrolytes was fabricated and tested. The bilayer electrolyte thin film, consisting of a 25 μm thick LDC layer and a 75 μm thick LSGM layer, was prepared by a simple dry…
We used a microreactor for CdSe nanocrystal preparation and explored the effects of experimental conditions on the properties of the products. The particle growth kinetics and photoluminescence properties of the nanocrystals showed identical trends to previous reports, indicating the efficiency of the current method f…
Development of simple and reliable protocols for the synthesis of phase-pure core–shell metal nanoparticles is an important problem in nanomaterials synthesis; the synthesis of Au core–Pd/Pt shell nanoparticles is described in this paper. This is accomplished by utilizing Keggin ions bound to the surface of gold nanop…
Molecular dynamics simulations were used to calculate the thermal conductivity of carbon nanotubes and diamond nanowires with atomic interactions modeled by the Brenner potential. The dependence of thermal conductivity on length, temperature, and temperature “boundary” condition was investigated. Lengths from 50 nm to…
Ultrafine grained structure formed dynamically through a severe warm deformation in the temperature range from 773 K to 923 K has been investigated in a 0.16%C-0.4%Si-1.4%Mn steel. The effects of the deformation conditions such as deformation temperature and strain rate on microstructural evolution were examined using…
The shape-preserving conversion of biologically self-assembled 3-D nanoparticle structures (SiO(2)-based diatom frustules) into a new nanocrystalline material (anatase TiO(2))via a halide gas/solid displacement reaction route is demonstrated.
The formation and reactivity of surface intermediates in the reverse water-gas-shift reaction on a Pt/CeO2 catalyst are critically dependent on the reaction conditions so that conclusions regarding the reaction mechanism cannot be inferred using ex operando conditions.
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Nanometre-sized PEDOT-silica core-shell particles were synthesized and self-assembled into crystalline colloidal arrays with a reflection peak in the visible region; these particles were also etched with hydrofluoric acid to produce hollow PEDOT particles.
We determined the local atomic structure of MgO epilayers on Ag(001) by means of polarization-dependent x-ray absorption spectroscopy measurements at the Mg and O $K$ edges. A quantitative analysis of the data in the extended energy range has been performed using multiple scattering simulations. We found that, even in…
We consider a fully practical finite element approximation of the nonlinear degenerate parabolic system \begin{align} \gamma\,\textstyle{\frac{\partial u}{\partial t}} - \nabla . ( \,b(u) \,\nabla [ w +\alpha\,\phi]\, ) = 0\,, \quad w = - \gamma\, \Delta u + \gamma^{-1}\,\Psi'(u)\,, %\nonumber \\ \quad \nabla . (\, c(…
Several bismuth amides and a bismuth thioamidate compound were synthesized and characterized in order to find volatile bismuth precursors for atomic layer deposition (ALD) of oxide materials. Crystal structures of Bi(N(SiMe3)2)3 and Bi(SC(Me)NPri)3 are reported. Based on precursor characterization Bi(N(SiMe3)2)3 was s…
Noncovalently functionalized MWNTs with SDS were coated with ZnS layers by a simple in-situ synthetic method without causing a significant modification of energy states of the MWNTs. The coating layer was composed of ZnS nanoparticles with size of less than 4 nm.