| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Functional Nanomaterials 2024
|
| Presentation Title |
Formation and Aging Behavior of Cerium Oxide-based Nanostructures in Peroxide Solution |
| Author(s) |
Craig J. Neal, Yifei Fu, Elayaraja Kolanthai, Sudipta Seal |
| On-Site Speaker (Planned) |
Craig J. Neal |
| Abstract Scope |
Metal oxide nanomaterials are well-suited for catalysis applications due to their rich defect characters and aqueous chemistry. Synthesis of such nanomaterials at or near room temperature, confers further benefit from the presence of more reactive defect structures which are lost on heating (e.g., due to dehydration, crystallization processes). In the presented study, cerium oxide nanostructures were prepared in water by addition of hydrogen peroxide and long-term (> 8 weeks) in situ aging. Over the term of this aging period, hydrous (peroxy-) cerium phases undergo an initial aggregation and sedimentation followed by a spontaneous dispersion into suspension. In concert with this macroscopic change in phase character, solutions are observed to undergo associated changes in pH (~4.2 to 3.5 to 4.5), coloration (orange to yellow to colorless;), and crystallinity. TEM and XPS measurements at discrete timepoints within the aging period allowed characterization of evolving material phases and their chemical state compositions/distributions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nanotechnology, Other |