| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Materials vs Minerals: Bridging the Gap between Materials Science and Earth and Planetary Science
|
| Presentation Title |
Formation of Carbon Nano-fragments from Silicon Carbide Surfaces: Implications for Carbon Reservoirs in Circumstellar Envelopes |
| Author(s) |
Abhishek Kumar Thakur, Venkateswara Manga, Krishna Muralidharan, Thomas J Zega, L.M. Ziurys |
| On-Site Speaker (Planned) |
Abhishek Kumar Thakur |
| Abstract Scope |
The gaseous envelopes around dying stars are characterized by rapid and dynamic evolution of grains via high-temperature, and often high-energy processes. These processes include grain condensation, transport, and collision, which can lead to grain ablation, grain amorphization, and formation of ablated molecular fragments. Silicon carbide (SiC) grains are known to commonly form in carbon-rich circumstellar envelopes and have been identified via their infrared emission. Using atomistic simulations, the structural evolution of silicon carbide grains when subjected to thermal shocks and high impact events, are examined. Particular attention is paid to surface ablation and ensuing ejection of carbon-containing molecular fragments, which form the structural basis for carbon nanotubes and fullerene molecules. |