12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

The reduction of melting temperature with size in Gold

13 Jul 2011, 17:00


Poster Presentation Track A - Condensed Matter Physics and Material Science Poster1


Mr Mokete Mahladisa (University of Limpopo (Turfloop campus))


The importance of gold for scientific use is of fundamental importance to research and technology developments. The bulk gold shows reluctance to participate in chemical reactions, the effect which has been corrected by the change in the size towards nanoclusters and, this makes the study of temperature effects on gold very important. We have performed molecular dynamics simulations on bulk and nanomaterials of gold at various temperatures to study the effect of size on the melting temperature. Melting temperature of bulk gold was determined to be 1320 K and this in good agreement with the experimental value of 1337 K. Different gold nanoclusters and nanotubes melt at temperatures lower than 1200 K which is a significant decrease in the melting temperature from the bulk. The face centered cubic (fcc) bulk gold structure remains intact at high temperatures while spherical nanoclusters and cylindrical nanotubes respectively transform into tetragonal structures and patches of spherical clusters.

Consider for a student <br> &nbsp; award (Yes / No)? No
Level (Hons, MSc, <br> &nbsp; PhD, other)? PhD
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes

Primary author

Mr Mokete Mahladisa (University of Limpopo (Turfloop campus))


Dr Lutz Ackermann (University of Limpopo (Turfloop Campus)) Prof. Phuti Ngoepe (University of Limpopo (Turfloop Campus))

Presentation Materials