Title

Architectured Nanomaterials from DNA

Streaming Media

Date of this Version

2020

Keywords

DNA origami, auxetic, metamaterials

Abstract

Here we demonstrate two dimensional (2D) architectured metamaterials from DNA that exhibit negative Poisson’s ratio. We characterize their auxetic properties and investigate underlying mechanics. We constructed several auxetic nanostructures from DNA origami, including reentrant honeycomb and re-entrant triangle. Given nanoscale dimensions, we implemented chemical loading (strand displacement) to demonstrate auxetic deformations. Simultaneously, a coarse-grained molecular dynamics (MD) simulations on the oxDNA platform was performed to study structural behaviors under external loads, determining mechanical properties such as Young’s modulus. We found that auxetic behaviors under chemical and mechanical loads are similar and qualitatively consistent, and that not only structure but chemistry also plays a role in behaviors of architecture metamaterials. Finally, we explored the classical elasticity theory to develop design guidelines for auxetic structures. Paper presented virtually for 17th Annual Conference on Foundations of Nanoscience: Self-Assembled Architectures and Devices (FNANO20)

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