1. 1Office of the Vice-Chancellor, University of Lucknow, Lucknow 226 007, India
2. 2Department of Applied Chemistry, Birla Institute of Technology, Mesra (BIT-Mesra), Ranchi 835 215, India
3. 3Department of Chemistry, Benaras Hindu University (BHU), Varanasi, India
4. 4Materials Science Centre, Indian Institute of Technology, Kharagpur 721 302, India
5. 5Hindustan Gum & Chemicals Ltd., Bhiwani 127 021, Haryana, India