1. Department of Polymer Science & TechnologyUniversity College of Science & Technology, University of Calcutta Kolkata 700009 India
2. Chemistry DepartmentMCKV Institute of Engineering Liluah, Howrah 711204 India
3. Department of Chemical and Biological EngineeringIndustrial Membrane Research Institute, University of Ottawa 161 Louis Pasteur St, Ottawa Ontario K1N 6N5 Canada