Creation of extremely strong and simultaneously ultra lightweight materials can be achieved by incorporating architecture into material design. In our research, we design and fabricate three-dimensional (3D) nano-architected materials that can exhibit superior and often tunable thermal, photonic, electrochemical, and mechanical properties at extremely low mass densities (lighter than aerogels), which renders them useful, and often enabling, in many scientific pursuits and technological applications. Dominant properties of such meta-materials are driven by their multi-scale nature: from characteristic material microstructure (atoms) to individual constituents (nanometers) to structural components (microns) to overall architectures (millimeters and above).
To harness the beneficial properties of 3D nano-architected meta-materials, it is critical to assess their properties at each relevant scale while capturing overall structural complexity. Our research is focused on fabrication and synthesis of such architected materials using 3D lithography, nanofabrication, and additive manufacturing (AM) techniques, as well as on investigating their mechanical, biochemical, electrochemical, electromechanical, and thermal properties as a function of architecture, constituent materials, and microstructural detail. We strive to uncover the synergy between the internal atomic-level microstructure and the nano-sized external dimensionality, where competing material- and structure-induced size effects drive overall response and govern these properties. Specific discussion topics also include their applications in chemical and biological devices, ultra lightweight energy storage systems, damagetolerant fabrics, and smart, multi-functional materials.
Some Relevant publications:
1. A.Vyatskikh, S. Delalande, A. Kudo, X. Zhang, and J. R. Greer “Additive Manufacturing of 3D Nano-Architected Metals” Nature Comms. (2018)
2. A. J. Mateos, W. Huang, YW Zhang, and J.R. Greer “Predicting failure in flawcontaining hollow ceramic nanolattices” Advanced Funct Mater. 1806772 (2018)
3. L. R. Meza, S. Das, J. R. Greer “Strong, Lightweight and Recoverable Three- Dimensional Ceramic Nanolattices” Science 345, 1322-1326 (2014)
4. D. Yee, M. D. Schulz, R. H. Grubbs, J. R. Greer “Functionalized threedimensional nano-architectures via thiol-Michael addition and two-photon lithography” Advanced Mater. 29, 1605293 (2017)
5. A. Maggi, H. Li, and J.R. Greer “3-D Nano-Architected Scaffolds with Tunable Stiffness for Efficient Bone Tissue Growth” Acta Biomater. 63, 294-305 (2017)
6. Shaw, L.A., Sun, F., Portela, C., Barranco, R.I., Greer, J.R., Hopkins, J.B. "Computationally Efficient Design of Directionally Compliant Metamaterials" Nature Comms doi.org/10.1038/s41467-018-08049 (2019).
7. X. Xia, C. V. Di Leo, X. W. Gu, A. Lozano, J. R. Greer “In Situ Lithiation– Delithiation of Mechanically Robust Cu–Si Core–Shell Nanolattices in a Scanning Electron Microscope” ACS Energy Letters 1, 492–499 (2016)
8. V. Chernow, H. Alaeian, J. Dionne, J.R. Greer “"Polymer Nanolattices as Mechanically Tunable 3-Dimensional Photonic Crystals" Appl. Phys. Lett 107, 101905 (2015).