About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
Silica-coated DNA Lattices as Mechanical Metamaterials |
Author(s) |
John Kulikowski, Shuang Wang, Melody Wang, Yonggang Ke, Wendy Gu |
On-Site Speaker (Planned) |
John Kulikowski |
Abstract Scope |
Lightweight and strong nanolattices show promise as impact resistance metamaterials. Typical lithographic fabrication methods face scalability issues. Additionally, as-printed structures typically have microscale features, and must be further processed (e.g. pyrolysis, coatings) to reach nanoscale dimensions. Self-assembled colloidal particle templates address scalability, but are generally limited to FCC structure. Here, we use self-assembled DNA to form octahedron lattices. These lattices are infiltrated with 1.8 nm thick silica, forming high strength core-shell lattice structures. Single crystal structures are on the order of ~5 µm, with ~40 nm unit cells. Structures are mechanically tested using in-situ SEM compression. Nanoscale size effects result in a yield strength of ~250 MPa and elastic modulus of ~850 MPa with density of ~0.5 g/cm3, which is comparable to state of the art lithographed structures. SEM imaging reveals two fracture regimes: cracking vertically and at 45o angles. FEA simulations are implemented to better understand this deformation behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Composites, Nanotechnology |