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Department of Physics Colloquium - Cooper Lecture

Monday, September 19, 2022 at 4:00pm to 5:00pm

Rockefeller Hall, Schwartz Auditorium
Central Campus

General Physics Colloquium and Cooper Lecture, Professor Julia Greer, Caltech

Title:   Intelligentsia of Nano-Architected Hierarchical Materials

Host:  Itai Cohen

Abstract:  Creation of reconfigurable and multi-functional 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, biochemical, and mechanical properties at extremely low mass densities (lighter than aerogels), which renders them useful and enabling in 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).

Our research is focused on fabrication and synthesis of nano- and micro-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. Additive manufacturing (AM) represents a set of processes that fabricate complex 3D structures using a layer-by-layer approach, with some advanced methods attaining nanometer resolution and the creation of unique, multifunctional materials and shapes derived from a photoinitiation-based chemical reaction of custom-synthesized resins and thermal post-processing. A type of AM, vat polymerization, has allowed for using hydrogels as precursors, and exploiting novel material properties, especially those that arise at the nano-scale and do not occur in conventional materials. The focus of this talk is on additive manufacturing via vat polymerization and function-containing chemical synthesis to create 3D nano- and micro-architected metals, ceramics, multifunctional metal oxides (nano-photonics, photocatalytic, piezoelectric, etc.), and metal-containing polymer complexes, etc., as well as demonstrate their potential in some real-use biomedical, protective, and sensing applications. I will describe how the choice of architecture, material, and external stimulus can elicit stimulus-responsive, reconfigurable, and multifunctional response.

 

Selected relevant publications:

1. Saccone, M. A., Gallivan, R.A., Narita, K., Yee, Daryl W., Greer, J.R. “Additive manufacturing of micro-architected metals via hydrogel infusion.Nature (accepted, 2022)

2. Xia, X., Spadaccini, C.M., Greer, J.R. “Responsive Materials Architected in Space and TimeNat Rev Mater doi.org/10.1038/s41578-022-00450-z (2022)

3. Portela, C.M., Edwards, B.W., Veysset, D. et al. Supersonic Impact Resilience of Nanoarchitected Carbon.Nature Mater. 20, 1491–1497 (2021)

4. Narita, K., Saccone, M.A., Sun, Y. et al. “Additive manufacturing of 3D batteries: a perspective.” J Mater Research 37, 1535–1546 (2022)

5. Narita, K., et al. “3D Architected Carbon Electrodes for Energy StorageAdvanced Energy Materials; 11 (5) (2021)

6. Xia, X., Afshar, A., Yang, H., Portela, C.M., Kochmann, D.M., Di Leo, C.V., Greer, J.R. “Electrochemically Reconfigurable Architected MaterialsNature, 573 (7773) 205 (2019).

7. Yee, D., Lifson, M., Greer, J.R. “Additive Manufacturing of 3D Architected Multifunctional Metal OxidesAdvanced Materials 31, 1901345 (2019).

8. Vyatskikh, A., Ng, R. C., Briggs, R., Greer, J.R. “Additive Manufacturing of High-Refractive-Index, Nanoarchitected Titanium Dioxide for 3D Dielectric Photonic CrystalsNano Letters 20 (5) (2020)

9. Portela, C. Vidyasagar, A., Greer, J.R., Kochmann, D. “Extreme Mechanical Resilience of Self-assembled Nano-labyrinthine Materials" Proceedings of the National Academy of Sciences, USA 117 (11) (2020)

Dial-In Information

This talk will also be available via Zoom, and the link will be emailed to the Physics listserv the week of the talk.  If you are not on the listserv, please contact Sue Sullivan at sfc1@cornell.edu by Monday at 3:00 pm to request the link.

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Event Type

Colloquium

Departments

LASSP, Physics, Materials Science and Engineering, LEPP, CLASSE

University Themes

Research

Tags

cascal, physics

Hashtag

#physics

Contact E-Mail

sfc1@cornell.edu

Contact Name

Sue Sullivan

Speaker

Julia Greer

Speaker Affiliation

Caltech

Dept. Web Site

https://physics.cornell.edu/

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