1. Departamento de Ingeniería de Materiales-DIMAT, Facultad de ingeniería; Universidad de Concepción; Concepción 4070409 Chile
2. Department of Engineering Chemistry, SRKR Engineering College; Bhimavaram Andhra Pradesh 534204 India
3. Departamento de Polimeros; Centro de Investigación de Polímeros Avanzados, CIPA, CONICYT Regional, GORE BIO-BIO PRFC0002, Avenida Collao 1202, Edificio de Laboratorios; Concepción Chile
4. Department of Physics; Swarnandhra College of Engineering and Technology; Narsapur Andhra Pradesh 534 280 India
5. School of Engineering Science and Technology; University of Hyderabad; Telangana 500046 India