Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q03: Programmed Responsive Polymers and Soft Matter II
3:00 PM–5:24 PM,
Wednesday, March 8, 2023
Room: Room 126
Sponsoring
Unit:
DPOLY
Chair: Liheng Cai, University of Virginia
Abstract: Q03.00008 : Programming Shape Transformations of Gel-based Micro-helices*
4:48 PM–5:00 PM
Presenter:
Xinpei Wu
(Stevens Institute of Technology)
Authors:
Xinpei Wu
(Stevens Institute of Technology)
Matthew Libera
(Stevens Institute of Technology)
Here we present a new approach to fabricating shape-shifting micro-helices from homopolymer films of poly(acrylic acid) (PAA) by electron-beam lithography. The spatial distribution of energy deposited by an incident electron beam drives PAA crosslinking and creates gradients in the crosslink density. Once hydrated, these gradients create bending, buckling, and twisting deformations that generate a helix from a straight-line precursor scribed by the electron beam. The helical properties such as radius and chirality can be programmed by controlling the internal stresses from the asymmetric swelling via the incident electron doses and the intentional patterning of swelling asymmetries. Since PAA is a weak polyelectrolyte, the helical properties are responsive to changes in pH. Finally, we demonstrate the fabrication of microgels with more complex geometries including tendril-like coils and double helices.
*This research project is supported by the Army Research Office by grant number W911NF2010277.
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