Ultrathin tough double network hydrogels showing adjustable muscle-like isometric force generation triggered by solventElectronic supplementary information (ESI) available: Additional experimental data and details and description of testing methods and setup. See DOI: 10.1039/b916581a

Ultrathin double-network hydrogels, which have super-high toughness under micro-scale thickness (elastic elongation b> 1000%, tensile strength σb> 2 MPa and tearing energy G∼ 600 J m−2), and solvent-triggered fast and high isometric stress generation, were synthesized by coupling the salt-controlled swelling process and polymer chain pre-reinforced technique. [ABSTRACT FROM AUTHOR]