Part Time Lecturer

Mr Clemence Sumanya

Qualifications: PhD Condensed Matter Physics, University of the Witwatersrand, Johannesburg, South Africa (2012); MSc Physics, University of the Witwatersrand, Johannesburg, South Africa (2006); BSc Physics, University of Zimbabwe

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Cell: +263784741898

Specialization: Condensed Matter Physics; Materials Science

Research Interests: Physical and mechanical properties of materials; Synthesizing and characterization of solids and thin supported films of platinum group metals and  transition metal carbides & nitrides for use in extreme conditions.

Research Experience

• Elastic properties of thin hard films (carbides and nitrides of transition metals.  and solids (platinum group alloys), using Brillouin light scattering spectroscopy.
• Preparation of thin films using RF Magnetron sputtering
• Characterization of solids and thin films using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-Ray reflectometry (XRR), Atomic force microscopy (AFM) and Scanning electron microscopy (SEM)

Publications

Articles in Peer Reviewed Journals

1. Sumanya , DM Wamwangi , JD Comins, Preparation and Characterisation of Titanium Carbide Thin Films for Surface Brillouin Scattering studies J. Mater. Environ. Sci., (2020) Volume 11, Issue 5, Page 808-822
2. C Sumanya, JD Comins and AG Every, Surface Brillouin Scattering in Titanium Carbide films. Wave Motion 68, (2017) 78-87
3. A.G. Every, C. Sumanya, B.A. Mathe, X. Zhang, J.D. Comins Optimized determination of elastic constants of crystals and their  uncertainties from surface Brillouin scattering. Ultrasonics 69 (2016) 273–278
4. Sumanya, B. A. Mathe, J. D. Comins, A. G. Every, M. Osawa, and H. Harada Room temperature elastic properties of Rh-based alloys studied by surface Brillouin scattering. Journal of Applied Physics 116, (2014) 133511
5. C Sumanya  (2012) Surface Brillouin Scattering in Opaque Thin Films and Bulk Materials, Ph D Thesis, University of the Witwatersrand, Johannesburg Jakata, D.M. Wamwangi, C. Sumanya, B.A. Mathe, R.M. Erasmus, S.R. Naidoo, J.D. Comins Thermally induced amorphous to crystalline transformation of argon ion bombarded GaAs studied with surface Brillouin and Raman scattering. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 286, (2012), 25–28
6. Wamwangi, D.M., Sumanya, C., Wittkowski, T., Comins, J.D. (2012).  Stress relaxation of   RF sputtered Cr₃C₂ thin films by surface Brillouin scattering. 18^th World Conference on Nondestructive testing, 16-20 April 2012, Durban, South Africa
7.  Sumanya, C., Comins, J. D., & Every, A. G. (2007).  Surface Brillouin scattering in opaque thin  films. Journal of Physics: Conference Series 92 012103.

Conference presentations

1. (December 2017) African Materials Research Society (AMRS2017) Botswana
2. (April 2012) Elastic constants of platinum group Alloys (Rh₃Zr and Rh₃Nb) Using surface Brillouin scattering (Poster) 18^th World Conference on Non-Destructive Testing Durban, South Africa
3. (July 2011) Surface Brillouin scattering study of TiC thin hard films (Oral) 56^th South African Institute of Physics (SAIP) Physics Department, St George’s Hotel, Pretoria, South Africa.
4. (June 2010) Surface Brillouin scattering of bulk materials and thin supported films (Oral) Material Research Physics Institute seminar Physics Department, University of the Witwatersrand, Johannesburg, South Africa.
5.  (May 2010) Academic Visit. National Institute for Materials Science, Japan
6. (April 2010) Room temperature elastic constants of platinum group alloys Rh₃Zr and Rh₃Nb using surface Brillouin scattering (Poster) 13^th International Conference on Phonons Scattering 2010, National Taiwan University, Taipei, Taiwan
7. (February 2010) Surface Brillouin scattering in thin films and bulk materials (Oral). Academic Visit Centre de Développment des Technologies Avancées (CDTA), Algeria
8. (July 2008) Elastic properties of platinum group alloys Rh₃Zr and Rh₃Nb using surface Brillouin scattering (Oral). 53^rd South African Institute of Physics (SAIP) University of Limpopo, South Africa. Awarded the Most Outstanding Oral Presentation in the field of Condensed Matter Physics by a PhD student prize.
9. (May 2008) Surface Brillouin scattering in thin supported films (Oral). 1^st African Laser Center (ALC) Student Symposium. Kariega Reserve, Port Elizabeth, South Africa.
10. (July 2007) Surface Brillouin scattering in opaque thin films (Poster). 12^th International Conference on Phonon Scattering of Condensed Matter. Paris, France
11. (July 2007) Surface Brillouin scattering studies in thin opaque films (Oral). 52^nd South African Institute of Physics (SAIP), University of Witwatersrand, Johannesburg, South Africa