| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Ceramic Materials and Processing
|
| Presentation Title |
Employing the dielectrophoretic interactions between ceramic particles in aqueous media and AC electric field in freeze-casting |
| Author(s) |
Dipankar Ghosh, Sivakumar Chithamallu |
| On-Site Speaker (Planned) |
Dipankar Ghosh |
| Abstract Scope |
Extrinsic manipulation of the spatial distribution of particles using external fields is of fundamental interest in freeze-casting. An advantage of using the alternating current (AC) electric field is that ceramic particles can directly respond to the applied electric field. However, the fundamental understanding of the interactions between ceramic particles in aqueous media and AC field due to the dielectrophoretic (DEP) forces is currently lacking. This presentation will shed insights on the underlying interactions using in situ experiments for dilute suspensions. Next, the potential of electric fields in the freeze-casting ceramic materials using concentrated suspensions will be discussed. A novel finding was that the AC field increased the viscosity of aqueous ceramic suspensions. With increasing viscosity, freeze-cast microstructure became increasingly dendritic, revealing a positive correlation between bridge density and compressive strength. Depending on the solid loading, dispersant concentration, and field duration, a 5- to 8-fold increase in strength was achieved. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Process Technology, Mechanical Properties |