38,611 research outputs found
De Angelis difusor de Vico: examen de un paradigma indiciario
No full textEl autor trata de determinar si la recepción de G. Vico en el contexto de la cultura rioplatense decimonónica se debió directamente a De Angelis o Michelet, aparentemente influido a su vez por De Angelis. Si la primera idea es plausible, dada la estancia del mismo italiano en la Argentina, entonces la conclusión parece clara: el verdadero papel de De Angelis en la difusión decimonónica de Vico no es un hecho, sino algo desconocido. Sin embargo, el hecho de que algo no se encuentre mostrado por la evidencia documental no impide su existencia ficcional.The author tries to determinate if the reception of G. Vico in the context of the River Plate Culture of the nineteenth century was due directly to De Angelis, or to Michelet, apparently influenced in turn by De Angelis. If the first idea is plausible, through the stay of the Italian himself in the Argentine, then the conclusion seems clear: the true rôle of De Angelis in the spread of Vico in the nineteenth century is an unknown, and not a fact. However, the fact that something is not shown by documentary evidence does not prevent it being fictionally suppoused
Design of Ru(II) sensitizers endowed by three anchoring units for adsorption mode and light harvesting optimization
No full textWe report the design, synthesis and computational investigation of a class of Ru(II)-dyes based on mixed bipyridine ligands for use in dye-sensitized solar cells. These dyes are designed to preserve the optimal anchoring mode of the prototypical N719 sensitizer by three carboxylic groups, yet allowing for tunable optimization of their electronic and optical properties by selective substitution at one of the 4-4′ positions of a single bipyridine ligand with π-excessive heteroaromatic groups. We used Density Functional Theory/Time Dependent Density Functional Theory calculations to analyze the electronic structure and optical properties of the dye and to investigate the dye adsorption mode on a TiO2 nanoparticle model. Our results show that we are effectively able to introduce three carboxylic anchoring units into the dye and achieve at the same time an enhanced dye light harvesting, demonstrating the design concept. As a drawback of this type of dyes, the synthesis leads to a mixture of dye isomers, which are rather tedious to separate
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