Speaker
Apply to be<br> considered for a student <br> award (Yes / No)?
Yes
Level for award<br> (Hons, MSc, <br> PhD, N/A)?
PhD
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?
Yes
Please indicate whether<br>this abstract may be<br>published online<br>(Yes / No)
Yes
Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
Recently, the energy sector in South Africa has attracted significant attention due to the crisis of power outage, high tariffs and a general inability to match supply and demand. To overcome these challenges, new energy resources have to be implemented. The high fossil fuel prices and the first ubiquitous signs of climate change have been enough to assist to the market a number of alternative, renewable sources of energy based on material that harvest and convert solar energy to other forms of energy (i.e. electricity and heat). Concentrating solar power technologies being one of the alternatives, use mirrors to concentrate radiation from the sun and convert it into high temperature heat, which is used to generate steam to drive a turbine that generates electrical power. New efficient material for this system are needed to lower the cost of CSP systems. Iron oxide (Fe2O3) based selective solar absorbers for high temperature conditions on stainless steel substrate are explored. Iron oxide Fe2O3 nanoparticles has the potential to be used as coating for solar absorber and it was investigated and reported once in literature due to its high thermal stability and solar absorption selectivity it was investigated once more in this work. This was done by changing parameters such as deposition time, current density, reaction temperature and solution concentration, using different deposition methods. The coating of Fe2O3 nanoparticles were deposited on the stainless steel substrate using three fabrication process/methods namely electron beam deposition, atomic layer deposition and plasma enhanced chemical vapour deposition. The effects of the thickness, substrate roughness and heat treatment on the performance of the Fe2O3 nanoparticles were analyzed using, HR-SEM, UV-VIS-NIR spectrophotometers equipped by integrating spheres, and Ellipsometry. The absorptance and the emittance were found to be closer to one and near zero respectively.
Main supervisor (name and email)<br>and his / her institution
Mothudi B.M
mothubm@unisa.ac.za
University of South Africa
