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Meeting Materials Science & Technology 2019
Symposium Emergent Materials under Extremes and Decisive In-situ Characterizations
Presentation Title In-situ Study of Multi-scale Deformation in Two-photon Polymerized Microlattices
Author(s) Pranjal Nautiyal, Victoria Wiedorn, Jenniffer Bustillos, Nicole Bacca, Xiaolong Lu, Sharon Fleischer, Gordana Vunjak-Novacovic, Alice White, Arvind Agarwal
On-Site Speaker (Planned) Pranjal Nautiyal
Abstract Scope Direct Laser Writing (DLW) via two-photon polymerization is used to fabricate honeycomb-like scaffolds for growing cardiac tissues. The structures consist of micrometer-thick walls that constitute honeycomb-shaped hollow cells less than 100 Ám in diameter, similar to the structure of native extracellular matrix. Considering their hierarchical structure and fine feature size, the load-bearing capability of the scaffolds is examined by ‘multi-scale’ in-situ indentation inside a scanning electron microscope to resolve the individual features and observe deformation in real time. The structures strongly resist deformation along the ‘out-of-plane’ orientation, collapse upon ‘in-plane’ loading, but demonstrate remarkable recovery upon unloading. Work hardening is observed for multiple loading cycles. The local modulus of the honeycomb walls is found to be ~800 MPa, which is 3 times higher than the modulus of the polymer under tension. The in-situ multi-scale characterization provides useful insights for printing of complex architectures with predictable mechanical characteristics using DLW.
Proceedings Inclusion? Definite: At-meeting proceedings


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