ArticleNature communications2026
Gentle yet powerful artificial muscles enabled by hierarchical structure engineering.
Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Developing artificial muscles with simultaneous high actuation performance and mild activation conditions is highly needed but still challenging. Here we broke the limitations through a hierarchical structure design of a dual-stimuli-responsive shape memory polymer (SMP) network, achieved by integrating a double-tail quaternary ammonium surfactant with poly(acrylic acid) via ionic complexation. Notably, the double‑tail surfactant exhibits a phase transition around 42 °C, enabling the mild‑temperature‑triggered actuation. The SMP‑based artificial muscle features a hierarchically nanophase‑separated structure, consisting of water‑responsive hydrophilic PAA domains and thermally responsive hydrophobic PAA/surfactant complex crystalline domains, thus decoupling the actuation stress and strain by different stimuli. The nanostructured artificial muscle achieves an actuation stress of up to 6.4 MPa (isometric) and an actuation strain of up to 79% (load-free), both under heating to ~42
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