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Intelligently Actuating Liquid Crystal Elastomer‐Carbon Nanotube Composites
Author(s) -
Kim Hyun,
Lee Jae Ah,
Ambulo Cedric P.,
Lee Ha Beom,
Kim Shi Hyeong,
Naik Vinay V.,
Haines Carter S.,
Aliev Ali E.,
OvalleRobles Raquel,
Baughman Ray H.,
Ware Taylor H.
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201905063
Subject(s) - materials science , carbon nanotube , composite material , actuator , artificial muscle , elastomer , liquid crystal , nanocomposite , composite number , photothermal effect , nanotechnology , photothermal therapy , optoelectronics , electrical engineering , engineering
Strategies for obtaining materials that respond to external stimuli by changing shape are of intense interest for the replacement of traditional actuators. Here, a strategy that enables programmable, multiresponsive actuators that use either visible light or electric current to drive shape change in composites comprising carbon nanotubes (CNTs) in liquid crystal elastomers (LCEs) is presented. In the nanocomposites, the CNTs function not only in the traditional roles of mechanical reinforcement and enhancers of thermal and electrical conductivity but also serve as an alignment layer for the LCEs. By controlling the orientation, location, and quantity of layers of CNTs in LCE/CNT composites, programmed, patterned actuators are built that respond to visible light or electrical current. Photothermal LCE/CNT film actuators undergo fast shape change, within 1.2 s using 280 mW cm −2 light input, and complex, programmed localized deformations. Furthermore, twisting LCE/CNT composite films into a fiber increases uniaxial muscle stroke and work capacity for electrothermal actuation, thereby enabling about 12% actuation strain and 100 kJ m −3 of work capacity in response to an applied DC voltage of 15.1 V cm −1 .