Papers by Author: Francesco Delogu

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Authors: A. Al-Hajry, Mohammad Al-Assiri, Stefano Enzo, Kwang Su Na, Neil Cowlam, J. Hefne, L. Jones, Francesco Delogu, H. Brequel
Authors: Francesco Delogu, Liliana Schiffini, Giorgio Cocco
Authors: Stefano Enzo, G. Mulas, Francesco Delogu, R. Frattini
Authors: C. Deidda, Francesco Delogu, Giorgio Cocco
Authors: G. Mulas, Francesco Delogu, M. Monagheddu, Liliana Schiffini, Giorgio Cocco
Authors: Stefano Enzo, R. Frattini, G. Mulas, Francesco Delogu
Authors: Francesco Delogu, Elisabetta Arca, Igor V. Shvets
Abstract: The present chapter deals with the difficult task of giving a brief survey of the synthetic routes employed to prepare materials with characteristic features on the nanometer scale. Definitions and general concepts regarding nanostructured and nanometer-sized materials are shortly tackled in the introductory part, which is followed by an overview of the most important approaches developed to synthesize such materials. No attempt is made to create a comprehensive and detailed synopsis of the experimental methods currently available. Rather, attention is focused on a selected number of general methodologies, the choice of which can be usually motivated by a mix of historical perspective, scientific significance and technological potential. So-called “top-down” approaches are discussed first, whereas the second part of the chapter is devoted to “bottom-up” ones. The former group includes mechanical processing, melt quenching, and de-vitrification methods. Sonochemistry, pulsed laser ablation, wet chemical synthesis, sol-gel processing, microwave processing, spray pyrolysis, flame synthesis, inert gas condensation, vapor deposition, and vapor-liquid-solid growth form instead the latter group.
Authors: Francesco Delogu
Abstract: The present chapter deals with the characterization and description of phase transitions in metallic systems with characteristic size down to the nanometer range. In particular, the chapter focuses on the solid-to-liquid transition in nanometer-sized particles. After a short introduction to classical thermodynamics and to the way it copes with the general properties exhibited by nanometer-sized systems, a rapid overview of the state of the art in the field of the solid-to-liquid transition is given. The heterogeneous melting processes taking place in mesoscopic systems are discussed in terms of both classical thermodynamic and numerical simulation approaches. In the former case, attention is focused on the case of mesoscopic Sn particles, for which a relatively large amount of consistent experimental data exists as a consequence of previous calorimetric studies. In the latter case, the behavior of mesoscopic Cu particles is discussed.
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