1. Department of Materials Science and Technology; Faculty of Science; Prince of Songkla University; Hat-Yai Thailand
2. Department of Rubber Technology and Polymer Science; Faculty of Science and Technology; Prince of Songkla University; Pattani Thailand
3. Faculty of Science and Industry Technology; Prince of Songkla University; Surat Thani Thailand
4. R&D Center; Department of Physics; Rajarajeswari College of Engineering; Bangalore India