Biomimetic damping eutectic gels enabled by comonomer-regulated phase separation for motion-artifact-resistant bioelectrodes

Biomimetic rigid-skeleton/viscous-channel architecture; • Minority HEMA regulates phase separation without backbone compromise; • Wide tensile strength (0.26–5.5 MPa) & high fracture energy (5.2 kJ m −2 ); • Excellent damping with peak tanδ of 1.25; • Motion-artifact-resistant bioelectrodes for reliable ECG/EMG monitoring. Motion-induced artifacts arising from insufficient energy dissipation severely hinder the practical application of eutectic gels in bioelectronics. Feline paw pads possess remarkable damping capability, enabling quiet locomotion through a multiphase architecture that synergistically combines load-bearing collagen frameworks with energy-dissipating adipose compartments. Inspired by this biological design, we report a biomimetic damping eutectic gel synthesized via a comonomer-mediated phase separation regulation strategy. By introducing a fraction of 2-hydroxyethyl methacrylate into an acrylic acid/deep eutectic solvent system, the phase morphology can be finely regulated without compromising the primary load-bearing network. This structural decoupling gives rise to a rigid-skeleton/viscous-channel architecture, endowing the gel with widely tunable tensile strength from 0.26 to 5.5 MPa, high fracture energy of 5.2 kJ m −2 , and extraordinary damping capacity. When used as epidermal bioelectrodes, the gels exploit their intrinsic damping capability to effectively suppress motion artifacts, enabling continuous, high-fidelity physiological signal monitoring.