| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Powder and Ceramic Materials Science
|
| Presentation Title |
K-22: Bioinspired Ceramic Monoliths from Freeze-Casting for Filtration Applications |
| Author(s) |
Sean Garner, Zhixiong Jack Li , Doheon Lee, Dimitri D Deheyn, Joanna M McKittrick |
| On-Site Speaker (Planned) |
Sean Garner |
| Abstract Scope |
The silica cell walls of diatom contain hierarchical porosity and are widely available in its fossilized form, diatomite. This research utilizes this cost-effective source of porous silica in a unidirectional freezing process (i.e. freeze-casting), which produces membranes with unidirectional lamellar walls (~10 µm spacing) that allow for efficient mass transport of fluids. Control over the monolith was explored by varying the ratio of diatomite and a flux material, sodium carbonate, and the solids ratio in the slurry before casting. Properties are measured using scanning electron microscopy, mercury porosimetry, and mechanical testing. The membranes (3.4 mm in thickness) undergo dead-end filtration of methylene blue dye and monodisperse latex beads to quantify the filtration performance through chemical adsorption and depth filtration mechanisms, respectively. These ceramic membranes are cost-effective and highly customizable for various filters, catalyst supports, and tissue engineering scaffolds. This work is supported by UC San Diego’s Chancellor’s Interdisciplinary Collaboratories grant. |
| Proceedings Inclusion? |
Planned: |