Fast Photoactuation Driven by Supramolecular Polymers Integrated into Covalent Networks
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
- Simpson Querrey Institute Northwestern University 303 East Superior Street, 11th floor Chicago IL 60611 USA
- Simpson Querrey Institute Northwestern University 303 East Superior Street, 11th floor Chicago IL 60611 USA, Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA; Simpson Querrey Institute Northwestern University 303 East Superior Street; 11th floor Chicago IL 60611 USA; Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA; Department of Chemical and Biological Engineering Northwestern University 2145 Sheridan Road Evanston IL USA; Department of Physics and Astronomy Northwestern University 2145 Sheridan Road Evanston IL USA
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA; Simpson Querrey Institute Northwestern University 303 East Superior Street; 11th floor Chicago IL 60611 USA; Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA; Department of Medicine Northwestern University 676 North St. Clair Street Chicago IL 60611 USA; Department of Biomedical Engineering Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
Abstract The design of robotic soft matter capable of emulating the complex movements of living organisms such as mechanical actuation, shape transformation, and autonomous translation remains a grand challenge in soft materials science. Functionalized hydrogels are excellent candidates for such materials since they can operate in water and are highly responsive to their environment, but their response times can be slow. This work investigates fast photoactuation of hybrid bonding hydrogels composed of peptide amphiphile (PA) supramolecular nanofibers bonded covalently to merocyanine‐based (MCH + ) photoresponsive networks. By incorporating ionizable acrylic acid (AA) co‐monomers in these networks, photoactuation at nearly neutral pH is observed, which in turn enables a new mechanism to accelerate the response by triggering the bundling of supramolecular nanofibers by rapid proton exchange reactions. Furthermore, this rapid response and its consequent large shape transformations lead to hydrogels capable of spontaneously tracking external light sources inspired by pedicellariae, defensive organs present in echinoderms like the starfish and the sea urchin. This work suggests that hybrid bonding polymers (HBPs), which leverage the interplay between supramolecular assemblies and covalent networks, offer novel strategies to design rapidly actuating soft robotic materials.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- NONE; SC0000989
- OSTI ID:
- 2479399
- Journal Information:
- Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 49 Vol. 34; ISSN 1616-301X
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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