[1] Ist Itailano Tecnol, Ctr MicrobioRobot, Pontedera, Italy
[2] Univ Trento, Dept Civil Environm & Mech Engn, Lab Bioinspired & Graphene Nanomech, Trento, Italy
[3] Queen Mary Univ London, Sch Engn & Mat Sci, London, England
[4] Italian Space Agcy, Rome, Italy