Latest News Archive
Please select Category, Year, and then Month to display items
13 December 2019
|
Story Valentino Ndaba
|
Photo iStock
Safety comes first, fun festive second.
Safety never takes a holiday. The University of the Free State’s Department of Protection Services wishes the Kovsie community happy and safe holidays.
Heed these tips when travelling, away on holiday or in the street.
- Be aware of your surroundings and any suspicious-looking persons or behaviour (especially in queues);
- Report any suspicious behaviour or activity to the central security on-site or the South African Police Services;
- Be alert when leaving shopping centres. Should you suspect that you are being followed, drive to the nearest police station;
- Jamming devices are frequently used by criminals, so ensure that your vehicle is locked by physically checking it before leaving;
- All valuables must be safely stowed away in the boot or under the seats in order to avoid smash and grab incidents;
- Do not leave your handbags or valuables unattended while shopping; and
- Obey the rules of the road and carry your driver’s licence with you.Happy holidays! Enter 2020 safe and secure!
Happy holidays! Enter 2020 safe and secure!
Prof Tredoux turns theories regarding the formation of metals on its head
2013-09-17
|
 |
|
Prof Marian Tredoux
17 September 2013 |
The latest research conducted by Prof Marian Tredoux of the Department of Geology, in collaboration with her research assistant Bianca Kennedy and their colleagues in Germany, placed established theories regarding how minerals of the platinum-group of elements are formed, under close scrutiny.
The article on this research of which Prof Tredoux is a co-author – ‘Noble metal nanoclusters and nanoparticles precede mineral formation in magmatic sulphide melts’ – was published in Nature Communications on 6 September 2013. It is an online journal for research of the highest quality in the fields of biological, physical and chemical sciences.
This study found that atoms of platinum and arsenic create nanoclusters, long before the mineral sperrylite can crystallise. Thus, the platinum does not occur as a primary sulphur compound. The research was conducted at the Steinmann Institute of the University of Bonn, Germany, as well as here in Bloemfontein.
Monetary support from Inkaba yeAfrica – a German-South African multidisciplinary and intercultural Earth Science collaborative of the National Research Foundation (NRF) – made this research possible. Studies are now also being conducted on other metals in the precious metal group, specifically palladium, rhodium and ruthenium.
The discovery of the nanoclusters and the combination with arsenic can have far-reaching consequences for the platinum mine industry, if it can be utilised to recover a greater amount of platinum ore and therefore less wastage ending up in mine dumps. This will signify optimal mining of a scarce and valuable metal, one of South Africa’s most important export products.
For Prof Tredoux, the research results also prove thoughts she already had some twenty years ago around the forming of platinum minerals. “Researchers laughed in my face, but the evidence had to wait for the development of technology to prove it.” Young researchers were very excited at recent congresses about the findings, since the new models can bring new insights.
“Chemistry researchers have been talking about platinum element clusters in watery environments for quite a while, but it was thought that these would not appear in magmas (molten rock) due to the high temperatures (>1 000 degrees celsius).”
Prof Tredoux has already delivered lectures at congresses in Scotland, Hungary, Sweden and Italy on this research.
Read the article at: http://www.nature.com/ncomms/2013/130906/ncomms3405/full/ncomms3405.html