1. Department of Chemical; Tshwane University of Technology; Metallurgical and Materials Engineering; Pretoria RSA
2. Department of Chemistry; University of Fort Hare; Alice Campus Eastern Cape South Africa
3. Department of Biological Sciences; North-West University; Mmabatho South Africa
4. DST/CSIR National Centre for Nano-structured Materials; Council for Scientific and Industrial Research; Brummeria Pretoria South Africa