1. Membrane Science and Separation Technology Division, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
2. Academy of Scientific and Innovative Research, CSIR‐Central Salt and Marine Chemicals Research InstituteCouncil of Scientific and Industrial Research GB Marg, Bhavnagar 364002 Gujarat India
3. Solid State Physics DivisionBhabha Atomic Research Centre Trombay, Mumbai 400085 India