Abstract：
Integrating gels with human skin through wearables provides unprecedented opportunities for health monitoring technology and artificial intelligence. However, most conductive hydrogels, organogels, and ionogels lack essential environmental stability, biocompatibility, and adhesion for reliable epidermal sensing. In this study, we have developed a liquid metal eutectogel simultaneously possessing superior viscoelasticity, semiflowability, and mechanical rigidity for low interfacial skin impedance, high skin adhesion, and durability. Liquid metal particles (LMPs) are employed to generate free radicals and gallium ions to accelerate the polymerization of acrylic acid monomers in a deep eutectic solvent (DES), obtaining highly viscoelastic polymer networks via physical cross-linking. In particular, graphene oxide (GO) is utilized to encapsulate the LMPs through a sonication-assisted electrostatic assembly to stabilize the LMPs in DES, which also enhances the mechanical toughness and regulates the rheological properties of the eutectogels. Our optimized semi-flowable eutectogel exhibits viscous fluid behavior at low shear rates, facilitating a highly conformable interface with hairy skin. Simultaneously, it demonstrates viscoelastic behavior at high shear rates, allowing for easy peel-off. These distinctive attributes enable the successful applications of on-skin adhesive strain sensing and high-fidelity human electrophysiological (EP) monitoring, showcasing the versatility of these ionically conductive liquid metal eutectogels in advanced personal health monitoring.
摘要：
通过可穿戴设备将凝胶与人体皮肤集成，为健康监测技术和人工智能提供了前所未有的机会。然而,大多数导电水凝胶，有机凝胶,离子凝胶缺乏必要的环境稳定性，生物相容性，和粘附可靠的表皮传感。在这项研究中,我们开发了一种同时具有优异粘弹性的液态金属共析体，半流动性，和低界面皮肤阻抗的机械刚度，高皮肤附着力，和耐用性。液态金属颗粒（LMPs）用于产生自由基和镓离子，以加速丙烯酸单体在低共熔溶剂（DES）中的聚合，通过物理交联获得高粘弹性聚合物网络。特别是,氧化石墨烯（GO）用于通过超声辅助静电组装来封装LMPs，以稳定DES中的LMPs，这也增强了机械韧性并调节了共晶的流变特性。我们优化的半流动共晶在低剪切速率下表现出粘性流体行为，促进与毛状皮肤高度贴合的界面。同时,它在高剪切速率下表现出粘弹性行为，允许容易剥离。这些独特的属性使皮肤上粘合剂应变传感和高保真人体电生理（EP）监测的成功应用，在先进的个人健康监测中展示了这些离子导电液态金属共轭架的多功能性。
