1. DST/CSIR National Centre for
Nano-Structured Materials, Council for Scientific and Industrial Research, 1-Meiring Naude Road, Brummeria,
Pretoria 0001, South Africa
2. Division of Polymer Technology,
Department of Mechanical Engineering, Tshwane University of Technology, Pretoria 0001, South Africa
3. Department of Applied Chemistry, University of Johannesburg, Doornforntein 2028, Johannesburg,
South Africa
4. Department
of Chemistry, King Abdulaziz University, Jeddah 21589, Kingdom of
Saudi Arab