1. Department of Polymer Engineering, University of Akron, 250 S. Forge Street, Akron, Ohio 44325, United States
2. Department of Condensed Matter Physics, University of Valladolid, Paseo del Cauce, Valladolid, Spain 47010
3. Foundation for Research and Development in Transport and Energy (CIDAUT), Parque Tecnológico de Boecillo, Plaza Vicente Aleixandre Campos N°2, Valladolid, Spain 47051