Fast and programmable locomotion of hydrogel-metal hybrids under light and magnetic fields

Chuang Li, Garrett C. Lau, Hang Yuan, Aaveg Aggarwal, Victor Lopez Dominguez, Shuangping Liu, Hiroaki Sai, Liam C. Palmer, Nicholas A. Sather, Tyler J. Pearson, Danna E Freedman, Pedram Khalili Amiri, Monica Olvera de la Cruz*, Samuel I. Stupp

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

125 Scopus citations


The design of soft matter in which internal fuels or an external energy input can generate locomotion and shape transformations observed in living organisms is a key challenge. Such materials could assist in productive functions that may range from robotics to smart management of chemical reactions and communication with cells. In this context, hydrated matter that can function in aqueous media would be of great interest. Here, we report the design of hydrogels containing a scaffold of high-aspect ratio ferromagnetic nanowires with nematic order dispersed in a polymer network that change shape in response to light and experience torques in rotating magnetic fields. The synergistic response enables fast walking motion of macroscopic objects in water on either flat or inclined surfaces and also guides delivery of cargo through rolling motion and light-driven shape changes. The theoretical description of the response to the external energy input allowed us to program specific trajectories of hydrogel objects that were verified experimentally.

Original languageEnglish (US)
Article numberabb9822
JournalScience Robotics
Issue number49
StatePublished - Dec 16 2020

ASJC Scopus subject areas

  • General Medicine


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