1. Gas Hydrate Division, CSIR─National Geophysical Research Institute (CSIR─NGRI), Hyderabad 500 007, India
2. Department of Chemistry, Adikavi Nannaya University, East Godavari, Rajamahendravaram, Andhra Pradesh 533296, India
3. Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India