Transport in magnetically ordered Pt nanocontacts

Pt nanocontacts, like those formed in mechanically controlled break junctions, are shown to develop spontaneous local magnetic order. Our density functional calculations predict that a robust local magnetic order exists in the atoms presenting low coordination, i.e., those forming the atom-sized neck. We thus find that the electronic transport can be spin polarized, although the net value of the conductance still agrees with available experimental information. Experimental implications of the formation of this new type of nanomagnet are discussed.

Ordered porous nanomaterials: the merit of small

This paper will introduce the reader to some of the “classical” and “new” families of ordered porous materials which have arisen throughout the past decades and/or years. From what is perhaps the best-known family of zeolites, which even now to this day is under constant research, to the exciting new family of hierarchical porous materials, the number of strategies, structures, porous textures, and potential applications grows with every passing day. We will attempt to put these new families into perspective from a synthetic and applied point of view in order to give the reader as broad a perspective as possible into these exciting materials.

El desafío de la migración mixta por vía marítima

Si bien los refugiados del mar con frecuencia huyen de una situación de crisis, comparten su modalidad de viaje con muchos tipos de migrantes. Aún queda mucho por hacer para responder a la migración irregular por vía marítima de manera que se protejan los derechos fundamentales y se respete la dignidad humana, aunque parece faltar voluntad política para ello.

Electrochemical generation of oxygen-containing groups in an ordered microporous zeolite-templated carbon

Zeolite templated carbon (ZTC) was electrochemically oxidized under various conditions, and its chemistry and structural evolution were compared to those produced by conventional chemical oxidation. In both oxidation methods, a general loss of the original structure regularity and high surface area was observed with increasing amount of oxidation. However, the electrochemical method showed much better controllability and enabled the generation of a large number of oxygen functional groups while retaining the original structure of the ZTC. Unlike chemical treatments, highly microporous carbons with an ordered 3-D structure, high surface area (ranging between 1900 and 3500 m2/g) and a large number of oxygen groups (O = 11,000–3300 μmol/g), have been prepared by the electrochemical method. Some insights into the electrooxidation mechanism of carbon materials are proposed from the obtained polarization curves, using ZTC as a model carbon material.

Romanç dels sopars d'en Baena, que el vate Gaspar Jaén i Urban va recitar a Elx l'any del senyor de 1984, per al sopar d'en Baena núm. 5, en quaresma, en març i en primavera

En este romance festivo se celebran los "sopars d'en Baena", unas reuniones mensuales que se celebraban en Elche en los primeros años ochenta con un carácter lúdico y festivo, en una época de gran efervescencia cultural y social en toda España.