1. Department of Chemistry North‐West University (Mafikeng Campus), Private Bag X2046 Mmabatho South Africa
2. Physical Chemistry Laboratories, Department of Chemistry Durban University of Technology (ML‐Sultan Campus) Durban South Africa
3. Departamento de Ingeniería Industrial, Facultad de Ingeniería Universidad Católica de la Santísima Concepción Concepción Chile
4. Department of Chemistry, College of Science King Saud University Riyadh Kingdom of Saudi Arabia
5. Department of Chemistry Southern University and A&M College Baton Rouge Louisiana USA
6. Department of Chemical and Metallurgical Engineering University of the Witwatersrand Johannesburg South Africa
7. Department of Chemistry, School of Mathematical and Natural Sciences University of Venda Thohoyandou South Africa