[1] Univ Concepcion, Mat Engn Dept, Edmundo Larenas 270, Concepcion, Chile
[2] Univ Concepcion, Technol Dev Unit, Avda Cordillera 2634, Coronel, Chile
[3] Univ Chile, Fac Phys & Math Sci, Surfaces & Nanomat Lab, Blanco Encalada 2008, Santiago, Chile
[4] Univ Concepcion, Mech Engn Dept, Edmundo Larenas 219, Concepcion, Chile
[5] Res Ctr Adv Polymers, Lab Bldg CIPA, Av Collao 1202, Concepcion, Chile