Phys.org  June 8, 2023 Researchers in China used gallium indium alloy (EGaIn) to initiate the polymerization and simultaneously serve as flexible fillers to construct a super-stretchable and self-healing liquid metal/polyvinyl alcohol/p(acrylamide-co-octadecyl methacrylate) (liquid metal/PVA/P(AAm-co-SMA)) double network hydrogel (LM hydrogel). These together with the ionic coordination and hydrogen bonds between polymer networks (multiple physical cross-links) made LM hydrogel super-stretchable, tough, notch resistant, and self-healing. The LM hydrogel exhibited sensitive strain sensing behavior, allowing human–computer interaction to achieve motion recognition and health monitoring because of the photothermal effect and low infrared emissivity of EGaIn. The LM hydrogel showed potential in infrared camouflage. […]