1. Department of Imaging and Printing Technology, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
2. Multidisciplinary Program of Petrochemistry and Polymer Science, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
3. Academy of Sciences; the Royal Institute of Thailand; Sanam Sueapa, Dusit Bangkok 10300 Thailand