Skin-like sensors are key for humanoid robots and wearables. Achieving both robust interfaces and promoted sensing performances in soft sensors may enable their applications in extreme mechanical conditions of high shear. However, strong interfacial adhesion in multilayer sensors often compromise sensing properties. Here, we design hyperbranched polyurethane micropillars with (diameter < length of flaw sensitivity) that serve dual roles as an adhesion layer for exceptional mechanical stability, and adaptive spacer for enhanced sensing properties. We show a strong size effect of the structure to toughen the interface, with ultrahigh interfacial toughness up to 5,095 J m −2 at a 50-μm pillar diameter. Simultaneously, the micropillars enhance sensitivity and limit of detection by decreasing the stiffness via elastic buckling and enable a rapid response to the acoustic range by reducing energy loss during loading and unloading. The sensors are ideal for the manipulation of heavy objects in humanoid robots and other applications.
Kai Chen,Chenyu Liu,Jinghuan Huang,Lingbin Che,Yuan Yuan,Changsheng Liu
Advanced bioadhesion techniques have offered unprecedented opportunities for life-saving internal surgical procedures. However, most existing bioadhesives failed to rapidly establish long-lasting reliable biointerface and effectively reconstruct normal physiological function in the body fluid-rich and inevitable dynamic internal environment. Herein, a PEGylated poly(glycerol sebacate)-based Janus adhesive patch (PEGS-based JAP) is developed by integrating physically crosslinked guanidinylated PEGS (PEGSG) and acryloylated PEGS-chemically crosslinked poly(acrylic acid)- N -hydrosuccinimide ester (PEGSA-crosslinked PAAc-NHS) with a single-sided zwitterionic polymer-interpenetrated layer. The dry JAP can rapidly absorb the unpleasant interfacial water and effectively form strong physical interactions with wet tissues. Benefiting from the amphiphilic nature of PEGSG and a simple spatial-confined drying process, the JAP is allowed to resist excessive swelling and limitedly swell along one direction to avoid deterioration of the as-established conformable patch-tissue interface. Moreover, covalent interactions formed subsequently can further improve the adhesive strength and ensure a long-lasting reliable adhesion. Meanwhile, the notch-insensitive and puncture-resistant JAP can achieve tough adhesion to adapt to the dynamic conditions owing to the highly efficient energy-dissipation mechanism of the physically cross-linked network. Combining the above ideal features with the desirable postoperative anti-adhesion ability, the PEGS-based JAP is demonstrated to be a promising candidate for internal tissue adhesion and function reconstruction.
危险品化学品经营许可证（带存储）