1. Department of Polymer Science and Technology; University of Calcutta; Kolkata 700009 India
2. Department of Environmental Science; University of Calcutta; Kolkata 700019 India
3. Department of Basic Science; Humanities and Social Sciences; Calcutta Institute of Engineering and Management; Tollygunge Kolkata 700040 India
4. Department of Materials Science; Indian Association for the Cultivation of Science; Kolkata 700032 India