约束-连通性耦合实现高效压电离子转换
Confinement-Connectivity Coupling Enables High-Efficiency Piezoionic Transduction
AI总结：
本文提出一种约束-连通性设计策略，通过多孔网络结构实现高效压电离子转换，实验显示其在无外部电源情况下可产生高电压和电流，并引发同步电肌图响应。
摘要：
压电离子水凝胶提供了一种机械驱动的生物电子接口途径，但其输出受限于快速对称离子再分布导致的电荷梯度耗散。在生物电细胞中，高效信号生成源于离子选择性与空间约束的耦合。本文引入了一种约束-连通性设计策略，通过超分子聚乙烯醇-甘油-瓜_excerpt[5]uril（PVA-甘醇-CB[5]）多孔网络实现，该网络具有层状负-中性-正架构，同时增加孔隙率并减少特征孔径。这种架构约束离子再分布，同时保持大移动离子储备，使变形驱动电荷分离。压缩可产生峰值输出约180 mV和9 mA，并在小鼠坐骨神经上引发同步电肌图响应，无需外部电源。这些结果确立了约束-连通性耦合，而非整体导电性，作为材料设计框架，其中耦合孔连通性与约束决定了压电离子转换。
英文摘要：
Piezoionic hydrogels offer a route to mechanically driven bioelectronic interfaces, but their output is limited by rapid, symmetric ion redistribution that dissipates charge gradients. In biological electrocytes, efficient signal generation arises from the coupling of ion selectivity with spatial confinement that regulates transport. Here, we introduce a confinement-connectivity design strategy for piezoionic hydrogels, implemented through a supramolecular poly(vinyl alcohol)-glycerol-cucurbit[5]uril (PVA-glycerol-CB[5]) mesoporous network with a layered Negative-Neutral-Positive architecture that simultaneously increases pore fraction while reducing characteristic pore size. This architecture constrains ionic redistribution while maintaining a large mobile-ion reservoir, enabling deformation-driven charge separation. Compression generates peak outputs of ~180 mV and ~9 mA and elicits synchronized electromyographic responses in the mouse sciatic nerve without external power. These results establish confinement-connectivity coupling, rather than bulk conductivity, as a materials design framework in which coupling pore connectivity and confinement governs piezoionic transduction.
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