1. Institute for Polymers, Composites and Biomaterials, National Research Council, Via Campi Flegrei 34, Pozzuoli; Naples 80078 Italy
2. Department of Chemical, Materials and Industrial Production Engineering; University of Naples Federico II, Piazzale Tecchio 80; Naples 80125 Italy
3. Department of Electrical Engineering and Information Technology; University of Naples Federico II, Via Claudio 21; Naples 80125 Italy
4. Department of Engineering; University of Sannio, Piazza Roma 21; Benevento 82100 Italy