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- W4311779858 abstract "The shape-morphing actuator that structurally and functionally biomimics natural muscle is an active research field. We present a novel twisting-bending coupled self-helix (TBSH) structure driven by reversible shape-morphing between a compact and extended helix at a human-friendly temperature. The following two independent deformations were induced on each perpendicular axis of a hydrogel fiber to obtain a hydrogel helix by mimicking the vorticella: 1) twisting in cross sections induced by pretwisted nylon spring and nontwisted poly(N-isopropylacrylamide) (PNIPAM) hydrogel, called torsional strain mismatch, and 2) bending in the longitudinal direction induced by a nonexpandable nylon spring and expandable PNIPAM hydrogel in a noncoaxial structure, called tensile strain mismatch. The TBSH was formed by the force balance, resulting in reversible shape-morphing with a change in the mechanical properties of PNIPAM (lower critical solution temperature = 33ºC). The elastic modulus increased with increasing temperatures, resulting in a shape change from a compact helix to an extended helix. The TBSH has three remarkably advanced characteristics: 1) a high tensile stroke (165%) with shape-morphing (11 times higher than that with only the PNIPAM fiber (−15%)), 2) extension with increasing temperature, the opposite the contraction of the previous thermally responsive actuator, and 3) fast extension within 3 s under an immediate temperature increment. The novel actuator can be applied in various industries, such as smart textiles and automatic thermostat systems." @default.
- W4311779858 created "2022-12-28" @default.
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- W4311779858 date "2023-03-01" @default.
- W4311779858 modified "2023-10-02" @default.
- W4311779858 title "Bio-inspired shape-morphing actuator with a large stroke at low temperatures" @default.
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- W4311779858 doi "https://doi.org/10.1016/j.snb.2022.133185" @default.
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