1. Polymer Engineering Laboratory; Department of Chemical Engineering; Faculty of Engineering, Chulalongkorn University; Bangkok 10330 Thailand
2. Department of Chemical Engineering; Faculty of Engineering; Srinakharinwirot University; Nakhonnayok 26120 Thailand
3. National Nanotechnology Center of Advanced Structural and Functional Nanomaterials; Department of Chemistry; Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand