| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
The Many Faces of “Free” Carbon in Polymer-Derived Ceramics |
| Author(s) |
Peter Kroll |
| On-Site Speaker (Planned) |
Peter Kroll |
| Abstract Scope |
We explore the structure formation of carbon during thermal processing of hybrid organic-inorganic polymers by various computational methods at different length scales. Focusing on polymer-derived SiCO and SiCN ceramics, we follow excess carbon through distinct stages. Initially, isolated carbon units of a molecular precursor are well dispersed throughout the polymer precursor. Upon annealing, those units combine and form a “free” carbon phase embedded in and surrounded by the polymer and glass network. Whether the “free” carbon forms distinct carbon flakes or extended graphene-like sheets depends on composition and temperature. In many instances, carbon segregations attain tubular structures. We will show that the mechanical properties of PDCs with identical compositions depend on the carbon morphology present in those ceramics. We will also highlight 2D-materials based on SiCO that await their realization. |