1. Department of Dental Sciences, Durban University of Technology (DUT), Durban, South Africa
2. Department of Chemistry, Durban University of Technology (DUT), Durban, South Africa
3. Discipline of Dentistry, University of KwaZulu-Natal (UKZN), Durban, South Africa
4. DST/Mintek Nanotechnology Innovation Centre, Advanced Materials Division, Mintek, Randburg, Johannesburg, South Africa
5. Public Management and Economics, Durban University of Technology (DUT), Durban, South Africa