Monolithic shape-programmable dielectric liquid crystal elastomer actuators.

Abstract:

:Soft robotics may enable many new technologies in which humans and robots physically interact, yet the necessary high-performance soft actuators still do not exist. The optimal soft actuators need to be fast and forceful and have programmable shape changes. Furthermore, they should be energy efficient for untethered applications and easy to fabricate. Here, we combine desirable characteristics from two distinct active material systems: fast and highly efficient actuation from dielectric elastomers and directed shape programmability from liquid crystal elastomers. Via a top-down photoalignment method, we program molecular alignment and localized giant elastic anisotropy into the liquid crystal elastomers. The linearly actuated liquid crystal elastomer monoliths achieve strain rates over 120% per second with an energy conversion efficiency of 20% while moving loads over 700 times the elastomer weight. The electric actuation mechanism offers unprecedented opportunities toward miniaturization with shape programmability, efficiency, and more degrees of freedom for applications in soft robotics and beyond.

journal_name

Sci Adv

journal_title

Science advances

authors

Davidson ZS,Shahsavan H,Aghakhani A,Guo Y,Hines L,Xia Y,Yang S,Sitti M

doi

10.1126/sciadv.aay0855

subject

Has Abstract

pub_date

2019-11-22 00:00:00

pages

eaay0855

issue

11

issn

2375-2548

pii

aay0855

journal_volume

5

pub_type

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