CityUHK research team develops 3D-printed biomimetic "mechanoelectrical" smart materials inspired by sea urchin spines

Core Insights - A research team at City University of Hong Kong has developed 3D-printed biomimetic "mechanoelectrical" smart materials inspired by the structure of sea urchin spines, which exhibit mechanoelectrical perception capabilities [1] Group 1: Research Findings - The porous ceramic structure of sea urchin spines generates measurable voltage signals when stimulated by water, with a response over a thousand times faster than visual perception [1] - The study published in Nature reveals that droplet stimulation induces a transient potential of approximately 100 mV, confirming that the response is due to the material's microstructure rather than biological nerves [1] - Electron microscopy analysis shows that the spine's bicontinuous porous skeleton has a pronounced pore-size gradient, enhancing solid-liquid interfacial charge separation [1] Group 2: Technological Advancements - The research team utilized vat photopolymerisation 3D printing to create biomimetic gradient samples, which demonstrated a threefold increase in voltage output and an eightfold increase in signal amplitude compared to gradient-free structures [1] - The development of a biomimetic mechanoreceptor allows for real-time detection of underwater flow intensity without the need for external power [1] Group 3: Implications and Applications - This study challenges the notion that natural porous structures are limited to mechanical functions, indicating their potential for various applications [1] - The biomimetic structures could significantly impact marine monitoring, underwater exploration, water management, and aerospace engineering, serving as a foundation for next-generation integrated structural and functional materials [1]