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

Journal Article · · Science Robotics
 [1];  [2];  [3];  [2];  [4];  [2];  [1];  [5];  [6];  [7];  [7];  [4];  [8];  [9]
  1. Center for Bio-inspired Energy Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
  2. Center for Bio-inspired Energy Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA., Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.
  3. Center for Bio-inspired Energy Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA., Graduate Program in Applied Physics, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
  4. Department of Electrical and Computer Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
  5. Center for Bio-inspired Energy Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA., Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA., Simpson Querrey Institute, Northwestern University, Chicago, IL 60611, USA.
  6. Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208, USA.
  7. Center for Bio-inspired Energy Science, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA., Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.
  8. Center for Bio-inspired Energy Science; Northwestern University; 2145 Sheridan Road; Evanston; IL 60208; USA.; Department of Materials Science and Engineering; Northwestern University; 2220 Campus Drive; Evanston; IL 60208; 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 60208; USA.; Department of Physics and Astronomy; Northwestern University; 2145 Sheridan Road; Evanston; IL 60208; USA.
  9. Center for Bio-inspired Energy Science; Northwestern University; 2145 Sheridan Road; Evanston; IL 60208; USA.; Department of Materials Science and Engineering; Northwestern University; 2220 Campus Drive; Evanston; IL 60208; USA.; Department of Chemistry; Northwestern University; 2145 Sheridan Road; Evanston; IL 60208; USA.; Department of Biomedical Engineering; Northwestern University; 2145 Sheridan Road; Evanston; IL 60208; USA.; Department of Medicine; Northwestern University; 676 N St. Clair Street; Chicago; IL 60611; USA.

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.

Research Organization:
Northwestern Univ., Evanston, IL (United States). Center for Bio-Inspired Energy Science (CBES)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0000989
OSTI ID:
1734832
Alternate ID(s):
OSTI ID: 1822918
OSTI ID: 1846620
OSTI ID: 1778988
OSTI ID: 1780644
Journal Information:
Science Robotics, Journal Name: Science Robotics Journal Issue: 49 Vol. 5; ISSN 2470-9476
Publisher:
American Association for the Advancement of Science (AAAS)Copyright Statement
Country of Publication:
United States
Language:
English

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