1. Central Research Laboratory, SBMCH, BIHER; Bharath University; Chrompet, Chennai 600 044 India
2. UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology, College of Graduate Studies; University of South Africa; Muckleneuk Ridge, PO Box 392 Pretoria RSA
3. Department of Physics; Thiruvalluvar University; TVUCAS Campus, Thennangur-604408 Vellore Tamil Nadu India
4. Nanosciences African Network (NANOAFNET); iThemba LABS National Research Foundation (NRF); 1 Old Faure Road Somerset West 7129 South Africa RSA
5. Department of Textile Engineering and Postgraduate Programme in Mechanical Engineering; Federal University of the State of Rio Grande do Norte, Campus Universitario; 59078-970 Natal RN Brazil